Source Code: lib/crypto.js
\nThe crypto module provides cryptographic functionality that includes a set of\nwrappers for OpenSSL's hash, HMAC, cipher, decipher, sign, and verify functions.
Use require('crypto') to access this module.
const crypto = require('crypto');\n\nconst secret = 'abcdefg';\nconst hash = crypto.createHmac('sha256', secret)\n .update('I love cupcakes')\n .digest('hex');\nconsole.log(hash);\n// Prints:\n// c0fa1bc00531bd78ef38c628449c5102aeabd49b5dc3a2a516ea6ea959d6658e\nIt is possible for Node.js to be built without including support for the\ncrypto module. In such cases, calling require('crypto') will result in an\nerror being thrown.
let crypto;\ntry {\n crypto = require('crypto');\n} catch (err) {\n console.log('crypto support is disabled!');\n}\nThe default encoding to use for functions that can take either strings\nor buffers. The default value is 'buffer', which makes methods\ndefault to Buffer objects.
The crypto.DEFAULT_ENCODING mechanism is provided for backwards compatibility\nwith legacy programs that expect 'latin1' to be the default encoding.
New applications should expect the default to be 'buffer'.
This property is deprecated.
" }, { "textRaw": "`crypto.fips`", "name": "fips", "meta": { "added": [ "v6.0.0" ], "deprecated": [ "v10.0.0" ], "changes": [] }, "stability": 0, "stabilityText": "Deprecated", "desc": "Property for checking and controlling whether a FIPS compliant crypto provider\nis currently in use. Setting to true requires a FIPS build of Node.js.
\nThis property is deprecated. Please use crypto.setFips() and\ncrypto.getFips() instead.
Creates and returns a Cipher object that uses the given algorithm and\npassword.
The options argument controls stream behavior and is optional except when a\ncipher in CCM or OCB mode is used (e.g. 'aes-128-ccm'). In that case, the\nauthTagLength option is required and specifies the length of the\nauthentication tag in bytes, see CCM mode. In GCM mode, the authTagLength\noption is not required but can be used to set the length of the authentication\ntag that will be returned by getAuthTag() and defaults to 16 bytes.
The algorithm is dependent on OpenSSL, examples are 'aes192', etc. On\nrecent OpenSSL releases, openssl list -cipher-algorithms\n(openssl list-cipher-algorithms for older versions of OpenSSL) will\ndisplay the available cipher algorithms.
The password is used to derive the cipher key and initialization vector (IV).\nThe value must be either a 'latin1' encoded string, a Buffer, a\nTypedArray, or a DataView.
The implementation of crypto.createCipher() derives keys using the OpenSSL\nfunction EVP_BytesToKey with the digest algorithm set to MD5, one\niteration, and no salt. The lack of salt allows dictionary attacks as the same\npassword always creates the same key. The low iteration count and\nnon-cryptographically secure hash algorithm allow passwords to be tested very\nrapidly.
In line with OpenSSL's recommendation to use a more modern algorithm instead of\nEVP_BytesToKey it is recommended that developers derive a key and IV on\ntheir own using crypto.scrypt() and to use crypto.createCipheriv()\nto create the Cipher object. Users should not use ciphers with counter mode\n(e.g. CTR, GCM, or CCM) in crypto.createCipher(). A warning is emitted when\nthey are used in order to avoid the risk of IV reuse that causes\nvulnerabilities. For the case when IV is reused in GCM, see Nonce-Disrespecting\nAdversaries for details.
Creates and returns a Cipher object, with the given algorithm, key and\ninitialization vector (iv).
The options argument controls stream behavior and is optional except when a\ncipher in CCM or OCB mode is used (e.g. 'aes-128-ccm'). In that case, the\nauthTagLength option is required and specifies the length of the\nauthentication tag in bytes, see CCM mode. In GCM mode, the authTagLength\noption is not required but can be used to set the length of the authentication\ntag that will be returned by getAuthTag() and defaults to 16 bytes.
The algorithm is dependent on OpenSSL, examples are 'aes192', etc. On\nrecent OpenSSL releases, openssl list -cipher-algorithms\n(openssl list-cipher-algorithms for older versions of OpenSSL) will\ndisplay the available cipher algorithms.
The key is the raw key used by the algorithm and iv is an\ninitialization vector. Both arguments must be 'utf8' encoded strings,\nBuffers, TypedArray, or DataViews. The key may optionally be\na KeyObject of type secret. If the cipher does not need\nan initialization vector, iv may be null.
Initialization vectors should be unpredictable and unique; ideally, they will be\ncryptographically random. They do not have to be secret: IVs are typically just\nadded to ciphertext messages unencrypted. It may sound contradictory that\nsomething has to be unpredictable and unique, but does not have to be secret;\nremember that an attacker must not be able to predict ahead of time what a\ngiven IV will be.
" }, { "textRaw": "`crypto.createDecipher(algorithm, password[, options])`", "type": "method", "name": "createDecipher", "meta": { "added": [ "v0.1.94" ], "deprecated": [ "v10.0.0" ], "changes": [ { "version": "v10.10.0", "pr-url": "https://github.com/nodejs/node/pull/21447", "description": "Ciphers in OCB mode are now supported." } ] }, "stability": 0, "stabilityText": "Deprecated: Use [`crypto.createDecipheriv()`][] instead.", "signatures": [ { "return": { "textRaw": "Returns: {Decipher}", "name": "return", "type": "Decipher" }, "params": [ { "textRaw": "`algorithm` {string}", "name": "algorithm", "type": "string" }, { "textRaw": "`password` {string | Buffer | TypedArray | DataView}", "name": "password", "type": "string | Buffer | TypedArray | DataView" }, { "textRaw": "`options` {Object} [`stream.transform` options][]", "name": "options", "type": "Object", "desc": "[`stream.transform` options][]" } ] } ], "desc": "Creates and returns a Decipher object that uses the given algorithm and\npassword (key).
The options argument controls stream behavior and is optional except when a\ncipher in CCM or OCB mode is used (e.g. 'aes-128-ccm'). In that case, the\nauthTagLength option is required and specifies the length of the\nauthentication tag in bytes, see CCM mode.
The implementation of crypto.createDecipher() derives keys using the OpenSSL\nfunction EVP_BytesToKey with the digest algorithm set to MD5, one\niteration, and no salt. The lack of salt allows dictionary attacks as the same\npassword always creates the same key. The low iteration count and\nnon-cryptographically secure hash algorithm allow passwords to be tested very\nrapidly.
In line with OpenSSL's recommendation to use a more modern algorithm instead of\nEVP_BytesToKey it is recommended that developers derive a key and IV on\ntheir own using crypto.scrypt() and to use crypto.createDecipheriv()\nto create the Decipher object.
Creates and returns a Decipher object that uses the given algorithm, key\nand initialization vector (iv).
The options argument controls stream behavior and is optional except when a\ncipher in CCM or OCB mode is used (e.g. 'aes-128-ccm'). In that case, the\nauthTagLength option is required and specifies the length of the\nauthentication tag in bytes, see CCM mode. In GCM mode, the authTagLength\noption is not required but can be used to restrict accepted authentication tags\nto those with the specified length.
The algorithm is dependent on OpenSSL, examples are 'aes192', etc. On\nrecent OpenSSL releases, openssl list -cipher-algorithms\n(openssl list-cipher-algorithms for older versions of OpenSSL) will\ndisplay the available cipher algorithms.
The key is the raw key used by the algorithm and iv is an\ninitialization vector. Both arguments must be 'utf8' encoded strings,\nBuffers, TypedArray, or DataViews. The key may optionally be\na KeyObject of type secret. If the cipher does not need\nan initialization vector, iv may be null.
Initialization vectors should be unpredictable and unique; ideally, they will be\ncryptographically random. They do not have to be secret: IVs are typically just\nadded to ciphertext messages unencrypted. It may sound contradictory that\nsomething has to be unpredictable and unique, but does not have to be secret;\nremember that an attacker must not be able to predict ahead of time what a given\nIV will be.
" }, { "textRaw": "`crypto.createDiffieHellman(prime[, primeEncoding][, generator][, generatorEncoding])`", "type": "method", "name": "createDiffieHellman", "meta": { "added": [ "v0.11.12" ], "changes": [ { "version": "v8.0.0", "pr-url": "https://github.com/nodejs/node/pull/12223", "description": "The `prime` argument can be any `TypedArray` or `DataView` now." }, { "version": "v8.0.0", "pr-url": "https://github.com/nodejs/node/pull/11983", "description": "The `prime` argument can be a `Uint8Array` now." }, { "version": "v6.0.0", "pr-url": "https://github.com/nodejs/node/pull/5522", "description": "The default for the encoding parameters changed from `binary` to `utf8`." } ] }, "signatures": [ { "return": { "textRaw": "Returns: {DiffieHellman}", "name": "return", "type": "DiffieHellman" }, "params": [ { "textRaw": "`prime` {string | Buffer | TypedArray | DataView}", "name": "prime", "type": "string | Buffer | TypedArray | DataView" }, { "textRaw": "`primeEncoding` {string} The [encoding][] of the `prime` string.", "name": "primeEncoding", "type": "string", "desc": "The [encoding][] of the `prime` string." }, { "textRaw": "`generator` {number | string | Buffer | TypedArray | DataView} **Default:** `2`", "name": "generator", "type": "number | string | Buffer | TypedArray | DataView", "default": "`2`" }, { "textRaw": "`generatorEncoding` {string} The [encoding][] of the `generator` string.", "name": "generatorEncoding", "type": "string", "desc": "The [encoding][] of the `generator` string." } ] } ], "desc": "Creates a DiffieHellman key exchange object using the supplied prime and an\noptional specific generator.
The generator argument can be a number, string, or Buffer. If\ngenerator is not specified, the value 2 is used.
If primeEncoding is specified, prime is expected to be a string; otherwise\na Buffer, TypedArray, or DataView is expected.
If generatorEncoding is specified, generator is expected to be a string;\notherwise a number, Buffer, TypedArray, or DataView is expected.
Creates a DiffieHellman key exchange object and generates a prime of\nprimeLength bits using an optional specific numeric generator.\nIf generator is not specified, the value 2 is used.
An alias for crypto.getDiffieHellman()
Creates an Elliptic Curve Diffie-Hellman (ECDH) key exchange object using a\npredefined curve specified by the curveName string. Use\ncrypto.getCurves() to obtain a list of available curve names. On recent\nOpenSSL releases, openssl ecparam -list_curves will also display the name\nand description of each available elliptic curve.
Creates and returns a Hash object that can be used to generate hash digests\nusing the given algorithm. Optional options argument controls stream\nbehavior. For XOF hash functions such as 'shake256', the outputLength option\ncan be used to specify the desired output length in bytes.
The algorithm is dependent on the available algorithms supported by the\nversion of OpenSSL on the platform. Examples are 'sha256', 'sha512', etc.\nOn recent releases of OpenSSL, openssl list -digest-algorithms\n(openssl list-message-digest-algorithms for older versions of OpenSSL) will\ndisplay the available digest algorithms.
Example: generating the sha256 sum of a file
\nconst filename = process.argv[2];\nconst crypto = require('crypto');\nconst fs = require('fs');\n\nconst hash = crypto.createHash('sha256');\n\nconst input = fs.createReadStream(filename);\ninput.on('readable', () => {\n // Only one element is going to be produced by the\n // hash stream.\n const data = input.read();\n if (data)\n hash.update(data);\n else {\n console.log(`${hash.digest('hex')} ${filename}`);\n }\n});\nCreates and returns an Hmac object that uses the given algorithm and key.\nOptional options argument controls stream behavior.
The algorithm is dependent on the available algorithms supported by the\nversion of OpenSSL on the platform. Examples are 'sha256', 'sha512', etc.\nOn recent releases of OpenSSL, openssl list -digest-algorithms\n(openssl list-message-digest-algorithms for older versions of OpenSSL) will\ndisplay the available digest algorithms.
The key is the HMAC key used to generate the cryptographic HMAC hash. If it is\na KeyObject, its type must be secret.
Example: generating the sha256 HMAC of a file
\nconst filename = process.argv[2];\nconst crypto = require('crypto');\nconst fs = require('fs');\n\nconst hmac = crypto.createHmac('sha256', 'a secret');\n\nconst input = fs.createReadStream(filename);\ninput.on('readable', () => {\n // Only one element is going to be produced by the\n // hash stream.\n const data = input.read();\n if (data)\n hmac.update(data);\n else {\n console.log(`${hmac.digest('hex')} ${filename}`);\n }\n});\nCreates and returns a new key object containing a private key. If key is a\nstring or Buffer, format is assumed to be 'pem'; otherwise, key\nmust be an object with the properties described above.
If the private key is encrypted, a passphrase must be specified. The length\nof the passphrase is limited to 1024 bytes.
Creates and returns a new key object containing a public key. If key is a\nstring or Buffer, format is assumed to be 'pem'; if key is a KeyObject\nwith type 'private', the public key is derived from the given private key;\notherwise, key must be an object with the properties described above.
If the format is 'pem', the 'key' may also be an X.509 certificate.
Because public keys can be derived from private keys, a private key may be\npassed instead of a public key. In that case, this function behaves as if\ncrypto.createPrivateKey() had been called, except that the type of the\nreturned KeyObject will be 'public' and that the private key cannot be\nextracted from the returned KeyObject. Similarly, if a KeyObject with type\n'private' is given, a new KeyObject with type 'public' will be returned\nand it will be impossible to extract the private key from the returned object.
Creates and returns a new key object containing a secret key for symmetric\nencryption or Hmac.
Creates and returns a Sign object that uses the given algorithm. Use\ncrypto.getHashes() to obtain the names of the available digest algorithms.\nOptional options argument controls the stream.Writable behavior.
In some cases, a Sign instance can be created using the name of a signature\nalgorithm, such as 'RSA-SHA256', instead of a digest algorithm. This will use\nthe corresponding digest algorithm. This does not work for all signature\nalgorithms, such as 'ecdsa-with-SHA256', so it is best to always use digest\nalgorithm names.
Creates and returns a Verify object that uses the given algorithm.\nUse crypto.getHashes() to obtain an array of names of the available\nsigning algorithms. Optional options argument controls the\nstream.Writable behavior.
In some cases, a Verify instance can be created using the name of a signature\nalgorithm, such as 'RSA-SHA256', instead of a digest algorithm. This will use\nthe corresponding digest algorithm. This does not work for all signature\nalgorithms, such as 'ecdsa-with-SHA256', so it is best to always use digest\nalgorithm names.
Computes the Diffie-Hellman secret based on a privateKey and a publicKey.\nBoth keys must have the same asymmetricKeyType, which must be one of 'dh'\n(for Diffie-Hellman), 'ec' (for ECDH), 'x448', or 'x25519' (for ECDH-ES).
Generates a new asymmetric key pair of the given type. RSA, DSA, EC, Ed25519,\nEd448, X25519, X448, and DH are currently supported.
If a publicKeyEncoding or privateKeyEncoding was specified, this function\nbehaves as if keyObject.export() had been called on its result. Otherwise,\nthe respective part of the key is returned as a KeyObject.
It is recommended to encode public keys as 'spki' and private keys as\n'pkcs8' with encryption for long-term storage:
const { generateKeyPair } = require('crypto');\ngenerateKeyPair('rsa', {\n modulusLength: 4096,\n publicKeyEncoding: {\n type: 'spki',\n format: 'pem'\n },\n privateKeyEncoding: {\n type: 'pkcs8',\n format: 'pem',\n cipher: 'aes-256-cbc',\n passphrase: 'top secret'\n }\n}, (err, publicKey, privateKey) => {\n // Handle errors and use the generated key pair.\n});\nOn completion, callback will be called with err set to undefined and\npublicKey / privateKey representing the generated key pair.
If this method is invoked as its util.promisify()ed version, it returns\na Promise for an Object with publicKey and privateKey properties.
Generates a new asymmetric key pair of the given type. RSA, DSA, EC, Ed25519,\nEd448, X25519, X448, and DH are currently supported.
If a publicKeyEncoding or privateKeyEncoding was specified, this function\nbehaves as if keyObject.export() had been called on its result. Otherwise,\nthe respective part of the key is returned as a KeyObject.
When encoding public keys, it is recommended to use 'spki'. When encoding\nprivate keys, it is recommended to use 'pkcs8' with a strong passphrase,\nand to keep the passphrase confidential.
const { generateKeyPairSync } = require('crypto');\nconst { publicKey, privateKey } = generateKeyPairSync('rsa', {\n modulusLength: 4096,\n publicKeyEncoding: {\n type: 'spki',\n format: 'pem'\n },\n privateKeyEncoding: {\n type: 'pkcs8',\n format: 'pem',\n cipher: 'aes-256-cbc',\n passphrase: 'top secret'\n }\n});\nThe return value { publicKey, privateKey } represents the generated key pair.\nWhen PEM encoding was selected, the respective key will be a string, otherwise\nit will be a buffer containing the data encoded as DER.
const ciphers = crypto.getCiphers();\nconsole.log(ciphers); // ['aes-128-cbc', 'aes-128-ccm', ...]\nconst curves = crypto.getCurves();\nconsole.log(curves); // ['Oakley-EC2N-3', 'Oakley-EC2N-4', ...]\nCreates a predefined DiffieHellmanGroup key exchange object. The\nsupported groups are: 'modp1', 'modp2', 'modp5' (defined in\nRFC 2412, but see Caveats) and 'modp14', 'modp15',\n'modp16', 'modp17', 'modp18' (defined in RFC 3526). The\nreturned object mimics the interface of objects created by\ncrypto.createDiffieHellman(), but will not allow changing\nthe keys (with diffieHellman.setPublicKey(), for example). The\nadvantage of using this method is that the parties do not have to\ngenerate nor exchange a group modulus beforehand, saving both processor\nand communication time.
Example (obtaining a shared secret):
\nconst crypto = require('crypto');\nconst alice = crypto.getDiffieHellman('modp14');\nconst bob = crypto.getDiffieHellman('modp14');\n\nalice.generateKeys();\nbob.generateKeys();\n\nconst aliceSecret = alice.computeSecret(bob.getPublicKey(), null, 'hex');\nconst bobSecret = bob.computeSecret(alice.getPublicKey(), null, 'hex');\n\n/* aliceSecret and bobSecret should be the same */\nconsole.log(aliceSecret === bobSecret);\nconst hashes = crypto.getHashes();\nconsole.log(hashes); // ['DSA', 'DSA-SHA', 'DSA-SHA1', ...]\nProvides an asynchronous Password-Based Key Derivation Function 2 (PBKDF2)\nimplementation. A selected HMAC digest algorithm specified by digest is\napplied to derive a key of the requested byte length (keylen) from the\npassword, salt and iterations.
The supplied callback function is called with two arguments: err and\nderivedKey. If an error occurs while deriving the key, err will be set;\notherwise err will be null. By default, the successfully generated\nderivedKey will be passed to the callback as a Buffer. An error will be\nthrown if any of the input arguments specify invalid values or types.
If digest is null, 'sha1' will be used. This behavior is deprecated,\nplease specify a digest explicitly.
The iterations argument must be a number set as high as possible. The\nhigher the number of iterations, the more secure the derived key will be,\nbut will take a longer amount of time to complete.
The salt should be as unique as possible. It is recommended that a salt is\nrandom and at least 16 bytes long. See NIST SP 800-132 for details.
const crypto = require('crypto');\ncrypto.pbkdf2('secret', 'salt', 100000, 64, 'sha512', (err, derivedKey) => {\n if (err) throw err;\n console.log(derivedKey.toString('hex')); // '3745e48...08d59ae'\n});\nThe crypto.DEFAULT_ENCODING property can be used to change the way the\nderivedKey is passed to the callback. This property, however, has been\ndeprecated and use should be avoided.
const crypto = require('crypto');\ncrypto.DEFAULT_ENCODING = 'hex';\ncrypto.pbkdf2('secret', 'salt', 100000, 512, 'sha512', (err, derivedKey) => {\n if (err) throw err;\n console.log(derivedKey); // '3745e48...aa39b34'\n});\nAn array of supported digest functions can be retrieved using\ncrypto.getHashes().
This API uses libuv's threadpool, which can have surprising and\nnegative performance implications for some applications; see the\nUV_THREADPOOL_SIZE documentation for more information.
Provides a synchronous Password-Based Key Derivation Function 2 (PBKDF2)\nimplementation. A selected HMAC digest algorithm specified by digest is\napplied to derive a key of the requested byte length (keylen) from the\npassword, salt and iterations.
If an error occurs an Error will be thrown, otherwise the derived key will be\nreturned as a Buffer.
If digest is null, 'sha1' will be used. This behavior is deprecated,\nplease specify a digest explicitly.
The iterations argument must be a number set as high as possible. The\nhigher the number of iterations, the more secure the derived key will be,\nbut will take a longer amount of time to complete.
The salt should be as unique as possible. It is recommended that a salt is\nrandom and at least 16 bytes long. See NIST SP 800-132 for details.
const crypto = require('crypto');\nconst key = crypto.pbkdf2Sync('secret', 'salt', 100000, 64, 'sha512');\nconsole.log(key.toString('hex')); // '3745e48...08d59ae'\nThe crypto.DEFAULT_ENCODING property may be used to change the way the\nderivedKey is returned. This property, however, is deprecated and use\nshould be avoided.
const crypto = require('crypto');\ncrypto.DEFAULT_ENCODING = 'hex';\nconst key = crypto.pbkdf2Sync('secret', 'salt', 100000, 512, 'sha512');\nconsole.log(key); // '3745e48...aa39b34'\nAn array of supported digest functions can be retrieved using\ncrypto.getHashes().
Decrypts buffer with privateKey. buffer was previously encrypted using\nthe corresponding public key, for example using crypto.publicEncrypt().
If privateKey is not a KeyObject, this function behaves as if\nprivateKey had been passed to crypto.createPrivateKey(). If it is an\nobject, the padding property can be passed. Otherwise, this function uses\nRSA_PKCS1_OAEP_PADDING.
Encrypts buffer with privateKey. The returned data can be decrypted using\nthe corresponding public key, for example using crypto.publicDecrypt().
If privateKey is not a KeyObject, this function behaves as if\nprivateKey had been passed to crypto.createPrivateKey(). If it is an\nobject, the padding property can be passed. Otherwise, this function uses\nRSA_PKCS1_PADDING.
Decrypts buffer with key.buffer was previously encrypted using\nthe corresponding private key, for example using crypto.privateEncrypt().
If key is not a KeyObject, this function behaves as if\nkey had been passed to crypto.createPublicKey(). If it is an\nobject, the padding property can be passed. Otherwise, this function uses\nRSA_PKCS1_PADDING.
Because RSA public keys can be derived from private keys, a private key may\nbe passed instead of a public key.
" }, { "textRaw": "`crypto.publicEncrypt(key, buffer)`", "type": "method", "name": "publicEncrypt", "meta": { "added": [ "v0.11.14" ], "changes": [ { "version": "v12.11.0", "pr-url": "https://github.com/nodejs/node/pull/29489", "description": "The `oaepLabel` option was added." }, { "version": "v12.9.0", "pr-url": "https://github.com/nodejs/node/pull/28335", "description": "The `oaepHash` option was added." }, { "version": "v11.6.0", "pr-url": "https://github.com/nodejs/node/pull/24234", "description": "This function now supports key objects." } ] }, "signatures": [ { "return": { "textRaw": "Returns: {Buffer} A new `Buffer` with the encrypted content.", "name": "return", "type": "Buffer", "desc": "A new `Buffer` with the encrypted content." }, "params": [ { "textRaw": "`key` {Object | string | Buffer | KeyObject}", "name": "key", "type": "Object | string | Buffer | KeyObject", "options": [ { "textRaw": "`key` {string | Buffer | KeyObject} A PEM encoded public or private key.", "name": "key", "type": "string | Buffer | KeyObject", "desc": "A PEM encoded public or private key." }, { "textRaw": "`oaepHash` {string} The hash function to use for OAEP padding and MGF1. **Default:** `'sha1'`", "name": "oaepHash", "type": "string", "default": "`'sha1'`", "desc": "The hash function to use for OAEP padding and MGF1." }, { "textRaw": "`oaepLabel` {Buffer | TypedArray | DataView} The label to use for OAEP padding. If not specified, no label is used.", "name": "oaepLabel", "type": "Buffer | TypedArray | DataView", "desc": "The label to use for OAEP padding. If not specified, no label is used." }, { "textRaw": "`passphrase` {string | Buffer} An optional passphrase for the private key.", "name": "passphrase", "type": "string | Buffer", "desc": "An optional passphrase for the private key." }, { "textRaw": "`padding` {crypto.constants} An optional padding value defined in `crypto.constants`, which may be: `crypto.constants.RSA_NO_PADDING`, `crypto.constants.RSA_PKCS1_PADDING`, or `crypto.constants.RSA_PKCS1_OAEP_PADDING`.", "name": "padding", "type": "crypto.constants", "desc": "An optional padding value defined in `crypto.constants`, which may be: `crypto.constants.RSA_NO_PADDING`, `crypto.constants.RSA_PKCS1_PADDING`, or `crypto.constants.RSA_PKCS1_OAEP_PADDING`." } ] }, { "textRaw": "`buffer` {Buffer | TypedArray | DataView}", "name": "buffer", "type": "Buffer | TypedArray | DataView" } ] } ], "desc": "Encrypts the content of buffer with key and returns a new\nBuffer with encrypted content. The returned data can be decrypted using\nthe corresponding private key, for example using crypto.privateDecrypt().
If key is not a KeyObject, this function behaves as if\nkey had been passed to crypto.createPublicKey(). If it is an\nobject, the padding property can be passed. Otherwise, this function uses\nRSA_PKCS1_OAEP_PADDING.
Because RSA public keys can be derived from private keys, a private key may\nbe passed instead of a public key.
" }, { "textRaw": "`crypto.randomBytes(size[, callback])`", "type": "method", "name": "randomBytes", "meta": { "added": [ "v0.5.8" ], "changes": [ { "version": "v9.0.0", "pr-url": "https://github.com/nodejs/node/pull/16454", "description": "Passing `null` as the `callback` argument now throws `ERR_INVALID_CALLBACK`." } ] }, "signatures": [ { "return": { "textRaw": "Returns: {Buffer} if the `callback` function is not provided.", "name": "return", "type": "Buffer", "desc": "if the `callback` function is not provided." }, "params": [ { "textRaw": "`size` {number}", "name": "size", "type": "number" }, { "textRaw": "`callback` {Function}", "name": "callback", "type": "Function", "options": [ { "textRaw": "`err` {Error}", "name": "err", "type": "Error" }, { "textRaw": "`buf` {Buffer}", "name": "buf", "type": "Buffer" } ] } ] } ], "desc": "Generates cryptographically strong pseudo-random data. The size argument\nis a number indicating the number of bytes to generate.
If a callback function is provided, the bytes are generated asynchronously\nand the callback function is invoked with two arguments: err and buf.\nIf an error occurs, err will be an Error object; otherwise it is null. The\nbuf argument is a Buffer containing the generated bytes.
// Asynchronous\nconst crypto = require('crypto');\ncrypto.randomBytes(256, (err, buf) => {\n if (err) throw err;\n console.log(`${buf.length} bytes of random data: ${buf.toString('hex')}`);\n});\nIf the callback function is not provided, the random bytes are generated\nsynchronously and returned as a Buffer. An error will be thrown if\nthere is a problem generating the bytes.
// Synchronous\nconst buf = crypto.randomBytes(256);\nconsole.log(\n `${buf.length} bytes of random data: ${buf.toString('hex')}`);\nThe crypto.randomBytes() method will not complete until there is\nsufficient entropy available.\nThis should normally never take longer than a few milliseconds. The only time\nwhen generating the random bytes may conceivably block for a longer period of\ntime is right after boot, when the whole system is still low on entropy.
This API uses libuv's threadpool, which can have surprising and\nnegative performance implications for some applications; see the\nUV_THREADPOOL_SIZE documentation for more information.
The asynchronous version of crypto.randomBytes() is carried out in a single\nthreadpool request. To minimize threadpool task length variation, partition\nlarge randomBytes requests when doing so as part of fulfilling a client\nrequest.
Synchronous version of crypto.randomFill().
const buf = Buffer.alloc(10);\nconsole.log(crypto.randomFillSync(buf).toString('hex'));\n\ncrypto.randomFillSync(buf, 5);\nconsole.log(buf.toString('hex'));\n\n// The above is equivalent to the following:\ncrypto.randomFillSync(buf, 5, 5);\nconsole.log(buf.toString('hex'));\nAny TypedArray or DataView instance may be passed as buffer.
const a = new Uint32Array(10);\nconsole.log(Buffer.from(crypto.randomFillSync(a).buffer,\n a.byteOffset, a.byteLength).toString('hex'));\n\nconst b = new Float64Array(10);\nconsole.log(Buffer.from(crypto.randomFillSync(b).buffer,\n b.byteOffset, b.byteLength).toString('hex'));\n\nconst c = new DataView(new ArrayBuffer(10));\nconsole.log(Buffer.from(crypto.randomFillSync(c).buffer,\n c.byteOffset, c.byteLength).toString('hex'));\nThis function is similar to crypto.randomBytes() but requires the first\nargument to be a Buffer that will be filled. It also\nrequires that a callback is passed in.
If the callback function is not provided, an error will be thrown.
const buf = Buffer.alloc(10);\ncrypto.randomFill(buf, (err, buf) => {\n if (err) throw err;\n console.log(buf.toString('hex'));\n});\n\ncrypto.randomFill(buf, 5, (err, buf) => {\n if (err) throw err;\n console.log(buf.toString('hex'));\n});\n\n// The above is equivalent to the following:\ncrypto.randomFill(buf, 5, 5, (err, buf) => {\n if (err) throw err;\n console.log(buf.toString('hex'));\n});\nAny TypedArray or DataView instance may be passed as buffer.
const a = new Uint32Array(10);\ncrypto.randomFill(a, (err, buf) => {\n if (err) throw err;\n console.log(Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength)\n .toString('hex'));\n});\n\nconst b = new Float64Array(10);\ncrypto.randomFill(b, (err, buf) => {\n if (err) throw err;\n console.log(Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength)\n .toString('hex'));\n});\n\nconst c = new DataView(new ArrayBuffer(10));\ncrypto.randomFill(c, (err, buf) => {\n if (err) throw err;\n console.log(Buffer.from(buf.buffer, buf.byteOffset, buf.byteLength)\n .toString('hex'));\n});\nThis API uses libuv's threadpool, which can have surprising and\nnegative performance implications for some applications; see the\nUV_THREADPOOL_SIZE documentation for more information.
The asynchronous version of crypto.randomFill() is carried out in a single\nthreadpool request. To minimize threadpool task length variation, partition\nlarge randomFill requests when doing so as part of fulfilling a client\nrequest.
Provides an asynchronous scrypt implementation. Scrypt is a password-based\nkey derivation function that is designed to be expensive computationally and\nmemory-wise in order to make brute-force attacks unrewarding.
\nThe salt should be as unique as possible. It is recommended that a salt is\nrandom and at least 16 bytes long. See NIST SP 800-132 for details.
The callback function is called with two arguments: err and derivedKey.\nerr is an exception object when key derivation fails, otherwise err is\nnull. derivedKey is passed to the callback as a Buffer.
An exception is thrown when any of the input arguments specify invalid values\nor types.
\nconst crypto = require('crypto');\n// Using the factory defaults.\ncrypto.scrypt('secret', 'salt', 64, (err, derivedKey) => {\n if (err) throw err;\n console.log(derivedKey.toString('hex')); // '3745e48...08d59ae'\n});\n// Using a custom N parameter. Must be a power of two.\ncrypto.scrypt('secret', 'salt', 64, { N: 1024 }, (err, derivedKey) => {\n if (err) throw err;\n console.log(derivedKey.toString('hex')); // '3745e48...aa39b34'\n});\nProvides a synchronous scrypt implementation. Scrypt is a password-based\nkey derivation function that is designed to be expensive computationally and\nmemory-wise in order to make brute-force attacks unrewarding.
\nThe salt should be as unique as possible. It is recommended that a salt is\nrandom and at least 16 bytes long. See NIST SP 800-132 for details.
An exception is thrown when key derivation fails, otherwise the derived key is\nreturned as a Buffer.
An exception is thrown when any of the input arguments specify invalid values\nor types.
\nconst crypto = require('crypto');\n// Using the factory defaults.\nconst key1 = crypto.scryptSync('secret', 'salt', 64);\nconsole.log(key1.toString('hex')); // '3745e48...08d59ae'\n// Using a custom N parameter. Must be a power of two.\nconst key2 = crypto.scryptSync('secret', 'salt', 64, { N: 1024 });\nconsole.log(key2.toString('hex')); // '3745e48...aa39b34'\nLoad and set the engine for some or all OpenSSL functions (selected by flags).
engine could be either an id or a path to the engine's shared library.
The optional flags argument uses ENGINE_METHOD_ALL by default. The flags\nis a bit field taking one of or a mix of the following flags (defined in\ncrypto.constants):
crypto.constants.ENGINE_METHOD_RSAcrypto.constants.ENGINE_METHOD_DSAcrypto.constants.ENGINE_METHOD_DHcrypto.constants.ENGINE_METHOD_RANDcrypto.constants.ENGINE_METHOD_ECcrypto.constants.ENGINE_METHOD_CIPHERScrypto.constants.ENGINE_METHOD_DIGESTScrypto.constants.ENGINE_METHOD_PKEY_METHScrypto.constants.ENGINE_METHOD_PKEY_ASN1_METHScrypto.constants.ENGINE_METHOD_ALLcrypto.constants.ENGINE_METHOD_NONEThe flags below are deprecated in OpenSSL-1.1.0.
\ncrypto.constants.ENGINE_METHOD_ECDHcrypto.constants.ENGINE_METHOD_ECDSAcrypto.constants.ENGINE_METHOD_STOREEnables the FIPS compliant crypto provider in a FIPS-enabled Node.js build.\nThrows an error if FIPS mode is not available.
" }, { "textRaw": "`crypto.sign(algorithm, data, key)`", "type": "method", "name": "sign", "meta": { "added": [ "v12.0.0" ], "changes": [] }, "signatures": [ { "return": { "textRaw": "Returns: {Buffer}", "name": "return", "type": "Buffer" }, "params": [ { "textRaw": "`algorithm` {string | null | undefined}", "name": "algorithm", "type": "string | null | undefined" }, { "textRaw": "`data` {Buffer | TypedArray | DataView}", "name": "data", "type": "Buffer | TypedArray | DataView" }, { "textRaw": "`key` {Object | string | Buffer | KeyObject}", "name": "key", "type": "Object | string | Buffer | KeyObject" } ] } ], "desc": "Calculates and returns the signature for data using the given private key and\nalgorithm. If algorithm is null or undefined, then the algorithm is\ndependent upon the key type (especially Ed25519 and Ed448).
If key is not a KeyObject, this function behaves as if key had been\npassed to crypto.createPrivateKey(). If it is an object, the following\nadditional properties can be passed:
dsaEncoding <string> For DSA and ECDSA, this option specifies the\nformat of the generated signature. It can be one of the following:
'der' (default): DER-encoded ASN.1 signature structure encoding (r, s).'ieee-p1363': Signature format r || s as proposed in IEEE-P1363.padding <integer> Optional padding value for RSA, one of the following:
crypto.constants.RSA_PKCS1_PADDING (default)crypto.constants.RSA_PKCS1_PSS_PADDINGRSA_PKCS1_PSS_PADDING will use MGF1 with the same hash function\nused to sign the message as specified in section 3.1 of RFC 4055.
saltLength <integer> Salt length for when padding is\nRSA_PKCS1_PSS_PADDING. The special value\ncrypto.constants.RSA_PSS_SALTLEN_DIGEST sets the salt length to the digest\nsize, crypto.constants.RSA_PSS_SALTLEN_MAX_SIGN (default) sets it to the\nmaximum permissible value.
This function is based on a constant-time algorithm.\nReturns true if a is equal to b, without leaking timing information that\nwould allow an attacker to guess one of the values. This is suitable for\ncomparing HMAC digests or secret values like authentication cookies or\ncapability urls.
a and b must both be Buffers, TypedArrays, or DataViews, and they\nmust have the same length.
Use of crypto.timingSafeEqual does not guarantee that the surrounding code\nis timing-safe. Care should be taken to ensure that the surrounding code does\nnot introduce timing vulnerabilities.
Verifies the given signature for data using the given key and algorithm. If\nalgorithm is null or undefined, then the algorithm is dependent upon the\nkey type (especially Ed25519 and Ed448).
If key is not a KeyObject, this function behaves as if key had been\npassed to crypto.createPublicKey(). If it is an object, the following\nadditional properties can be passed:
dsaEncoding <string> For DSA and ECDSA, this option specifies the\nformat of the generated signature. It can be one of the following:
'der' (default): DER-encoded ASN.1 signature structure encoding (r, s).'ieee-p1363': Signature format r || s as proposed in IEEE-P1363.padding <integer> Optional padding value for RSA, one of the following:
crypto.constants.RSA_PKCS1_PADDING (default)crypto.constants.RSA_PKCS1_PSS_PADDINGRSA_PKCS1_PSS_PADDING will use MGF1 with the same hash function\nused to sign the message as specified in section 3.1 of RFC 4055.
saltLength <integer> Salt length for when padding is\nRSA_PKCS1_PSS_PADDING. The special value\ncrypto.constants.RSA_PSS_SALTLEN_DIGEST sets the salt length to the digest\nsize, crypto.constants.RSA_PSS_SALTLEN_MAX_SIGN (default) sets it to the\nmaximum permissible value.
The signature argument is the previously calculated signature for the data.
Because public keys can be derived from private keys, a private key or a public\nkey may be passed for key.
The Crypto module was added to Node.js before there was the concept of a\nunified Stream API, and before there were Buffer objects for handling\nbinary data. As such, the many of the crypto defined classes have methods not\ntypically found on other Node.js classes that implement the streams\nAPI (e.g. update(), final(), or digest()). Also, many methods accepted\nand returned 'latin1' encoded strings by default rather than Buffers. This\ndefault was changed after Node.js v0.8 to use Buffer objects by default\ninstead.
Usage of ECDH with non-dynamically generated key pairs has been simplified.\nNow, ecdh.setPrivateKey() can be called with a preselected private key\nand the associated public point (key) will be computed and stored in the object.\nThis allows code to only store and provide the private part of the EC key pair.\necdh.setPrivateKey() now also validates that the private key is valid for\nthe selected curve.
The ecdh.setPublicKey() method is now deprecated as its inclusion in the\nAPI is not useful. Either a previously stored private key should be set, which\nautomatically generates the associated public key, or ecdh.generateKeys()\nshould be called. The main drawback of using ecdh.setPublicKey() is that\nit can be used to put the ECDH key pair into an inconsistent state.
The crypto module still supports some algorithms which are already\ncompromised and are not currently recommended for use. The API also allows\nthe use of ciphers and hashes with a small key size that are too weak for safe\nuse.
Users should take full responsibility for selecting the crypto\nalgorithm and key size according to their security requirements.
\nBased on the recommendations of NIST SP 800-131A:
\nmodp1, modp2 and modp5 have a key size\nsmaller than 2048 bits and are not recommended.See the reference for other recommendations and details.
", "type": "module", "displayName": "Support for weak or compromised algorithms" }, { "textRaw": "CCM mode", "name": "ccm_mode", "desc": "CCM is one of the supported AEAD algorithms. Applications which use this\nmode must adhere to certain restrictions when using the cipher API:
\nauthTagLength option and must be one of 4, 6, 8, 10, 12, 14 or\n16 bytes.N must be between 7 and 13\nbytes (7 ≤ N ≤ 13).2 ** (8 * (15 - N)) bytes.setAuthTag() before\ncalling update().\nOtherwise, decryption will fail and final() will throw an error in\ncompliance with section 2.6 of RFC 3610.write(data), end(data) or pipe() in CCM\nmode might fail as CCM cannot handle more than one chunk of data per instance.setAAD() via the plaintextLength\noption.\nMany crypto libraries include the authentication tag in the ciphertext,\nwhich means that they produce ciphertexts of the length\nplaintextLength + authTagLength. Node.js does not include the authentication\ntag, so the ciphertext length is always plaintextLength.\nThis is not necessary if no AAD is used.update() can only be called\nonce.update() is sufficient to encrypt/decrypt the message,\napplications must call final() to compute or verify the\nauthentication tag.const crypto = require('crypto');\n\nconst key = 'keykeykeykeykeykeykeykey';\nconst nonce = crypto.randomBytes(12);\n\nconst aad = Buffer.from('0123456789', 'hex');\n\nconst cipher = crypto.createCipheriv('aes-192-ccm', key, nonce, {\n authTagLength: 16\n});\nconst plaintext = 'Hello world';\ncipher.setAAD(aad, {\n plaintextLength: Buffer.byteLength(plaintext)\n});\nconst ciphertext = cipher.update(plaintext, 'utf8');\ncipher.final();\nconst tag = cipher.getAuthTag();\n\n// Now transmit { ciphertext, nonce, tag }.\n\nconst decipher = crypto.createDecipheriv('aes-192-ccm', key, nonce, {\n authTagLength: 16\n});\ndecipher.setAuthTag(tag);\ndecipher.setAAD(aad, {\n plaintextLength: ciphertext.length\n});\nconst receivedPlaintext = decipher.update(ciphertext, null, 'utf8');\n\ntry {\n decipher.final();\n} catch (err) {\n console.error('Authentication failed!');\n return;\n}\n\nconsole.log(receivedPlaintext);\nThe following constants exported by crypto.constants apply to various uses of\nthe crypto, tls, and https modules and are generally specific to OpenSSL.
| Constant | \nDescription | \n
|---|---|
SSL_OP_ALL | \n Applies multiple bug workarounds within OpenSSL. See\n https://www.openssl.org/docs/man1.0.2/ssl/SSL_CTX_set_options.html\n for detail. | \n
SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION | \n Allows legacy insecure renegotiation between OpenSSL and unpatched\n clients or servers. See\n https://www.openssl.org/docs/man1.0.2/ssl/SSL_CTX_set_options.html. | \n
SSL_OP_CIPHER_SERVER_PREFERENCE | \n Attempts to use the server's preferences instead of the client's when\n selecting a cipher. Behavior depends on protocol version. See\n https://www.openssl.org/docs/man1.0.2/ssl/SSL_CTX_set_options.html. | \n
SSL_OP_CISCO_ANYCONNECT | \n Instructs OpenSSL to use Cisco's \"speshul\" version of DTLS_BAD_VER. | \n
SSL_OP_COOKIE_EXCHANGE | \n Instructs OpenSSL to turn on cookie exchange. | \n
SSL_OP_CRYPTOPRO_TLSEXT_BUG | \n Instructs OpenSSL to add server-hello extension from an early version\n of the cryptopro draft. | \n
SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS | \n Instructs OpenSSL to disable a SSL 3.0/TLS 1.0 vulnerability\n workaround added in OpenSSL 0.9.6d. | \n
SSL_OP_EPHEMERAL_RSA | \n Instructs OpenSSL to always use the tmp_rsa key when performing RSA\n operations. | \n
SSL_OP_LEGACY_SERVER_CONNECT | \n Allows initial connection to servers that do not support RI. | \n
SSL_OP_MICROSOFT_BIG_SSLV3_BUFFER | \n \n |
SSL_OP_MICROSOFT_SESS_ID_BUG | \n \n |
SSL_OP_MSIE_SSLV2_RSA_PADDING | \n Instructs OpenSSL to disable the workaround for a man-in-the-middle\n protocol-version vulnerability in the SSL 2.0 server implementation. | \n
SSL_OP_NETSCAPE_CA_DN_BUG | \n \n |
SSL_OP_NETSCAPE_CHALLENGE_BUG | \n \n |
SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG | \n \n |
SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG | \n \n |
SSL_OP_NO_COMPRESSION | \n Instructs OpenSSL to disable support for SSL/TLS compression. | \n
SSL_OP_NO_QUERY_MTU | \n \n |
SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | \n Instructs OpenSSL to always start a new session when performing\n renegotiation. | \n
SSL_OP_NO_SSLv2 | \n Instructs OpenSSL to turn off SSL v2 | \n
SSL_OP_NO_SSLv3 | \n Instructs OpenSSL to turn off SSL v3 | \n
SSL_OP_NO_TICKET | \n Instructs OpenSSL to disable use of RFC4507bis tickets. | \n
SSL_OP_NO_TLSv1 | \n Instructs OpenSSL to turn off TLS v1 | \n
SSL_OP_NO_TLSv1_1 | \n Instructs OpenSSL to turn off TLS v1.1 | \n
SSL_OP_NO_TLSv1_2 | \n Instructs OpenSSL to turn off TLS v1.2 | \nSSL_OP_PKCS1_CHECK_1 | \n \n \n |
SSL_OP_PKCS1_CHECK_2 | \n \n |
SSL_OP_SINGLE_DH_USE | \n Instructs OpenSSL to always create a new key when using\n temporary/ephemeral DH parameters. | \n
SSL_OP_SINGLE_ECDH_USE | \n Instructs OpenSSL to always create a new key when using\n temporary/ephemeral ECDH parameters. | \nSSL_OP_SSLEAY_080_CLIENT_DH_BUG | \n \n \n |
SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG | \n \n |
SSL_OP_TLS_BLOCK_PADDING_BUG | \n \n |
SSL_OP_TLS_D5_BUG | \n \n |
SSL_OP_TLS_ROLLBACK_BUG | \n Instructs OpenSSL to disable version rollback attack detection. | \n
| Constant | \nDescription | \n
|---|---|
ENGINE_METHOD_RSA | \n Limit engine usage to RSA | \n
ENGINE_METHOD_DSA | \n Limit engine usage to DSA | \n
ENGINE_METHOD_DH | \n Limit engine usage to DH | \n
ENGINE_METHOD_RAND | \n Limit engine usage to RAND | \n
ENGINE_METHOD_EC | \n Limit engine usage to EC | \n
ENGINE_METHOD_CIPHERS | \n Limit engine usage to CIPHERS | \n
ENGINE_METHOD_DIGESTS | \n Limit engine usage to DIGESTS | \n
ENGINE_METHOD_PKEY_METHS | \n Limit engine usage to PKEY_METHDS | \n
ENGINE_METHOD_PKEY_ASN1_METHS | \n Limit engine usage to PKEY_ASN1_METHS | \n
ENGINE_METHOD_ALL | \n \n |
ENGINE_METHOD_NONE | \n \n |
See the list of SSL OP Flags for details.
\n| Constant | \nDescription | \n
|---|---|
DH_CHECK_P_NOT_SAFE_PRIME | \n \n |
DH_CHECK_P_NOT_PRIME | \n \n |
DH_UNABLE_TO_CHECK_GENERATOR | \n \n |
DH_NOT_SUITABLE_GENERATOR | \n \n |
ALPN_ENABLED | \n \n |
RSA_PKCS1_PADDING | \n \n |
RSA_SSLV23_PADDING | \n \n |
RSA_NO_PADDING | \n \n |
RSA_PKCS1_OAEP_PADDING | \n \n |
RSA_X931_PADDING | \n \n |
RSA_PKCS1_PSS_PADDING | \n \n |
RSA_PSS_SALTLEN_DIGEST | \n Sets the salt length for RSA_PKCS1_PSS_PADDING to the\n digest size when signing or verifying. | \n
RSA_PSS_SALTLEN_MAX_SIGN | \n Sets the salt length for RSA_PKCS1_PSS_PADDING to the\n maximum permissible value when signing data. | \n
RSA_PSS_SALTLEN_AUTO | \n Causes the salt length for RSA_PKCS1_PSS_PADDING to be\n determined automatically when verifying a signature. | \n
POINT_CONVERSION_COMPRESSED | \n \n |
POINT_CONVERSION_UNCOMPRESSED | \n \n |
POINT_CONVERSION_HYBRID | \n \n |
| Constant | \nDescription | \n
|---|---|
defaultCoreCipherList | \n Specifies the built-in default cipher list used by Node.js. | \n
defaultCipherList | \n Specifies the active default cipher list used by the current Node.js\n process. | \n
SPKAC is a Certificate Signing Request mechanism originally implemented by\nNetscape and was specified formally as part of HTML5's keygen element.
<keygen> is deprecated since HTML 5.2 and new projects\nshould not use this element anymore.
The crypto module provides the Certificate class for working with SPKAC\ndata. The most common usage is handling output generated by the HTML5\n<keygen> element. Node.js uses OpenSSL's SPKAC implementation internally.
const { Certificate } = require('crypto');\nconst spkac = getSpkacSomehow();\nconst challenge = Certificate.exportChallenge(spkac);\nconsole.log(challenge.toString('utf8'));\n// Prints: the challenge as a UTF8 string\nconst { Certificate } = require('crypto');\nconst spkac = getSpkacSomehow();\nconst publicKey = Certificate.exportPublicKey(spkac);\nconsole.log(publicKey);\n// Prints: the public key as <Buffer ...>\nconst { Certificate } = require('crypto');\nconst spkac = getSpkacSomehow();\nconsole.log(Certificate.verifySpkac(Buffer.from(spkac)));\n// Prints: true or false\nAs a still supported legacy interface, it is possible (but not recommended) to\ncreate new instances of the crypto.Certificate class as illustrated in the\nexamples below.
Instances of the Certificate class can be created using the new keyword\nor by calling crypto.Certificate() as a function:
const crypto = require('crypto');\n\nconst cert1 = new crypto.Certificate();\nconst cert2 = crypto.Certificate();\nconst cert = require('crypto').Certificate();\nconst spkac = getSpkacSomehow();\nconst challenge = cert.exportChallenge(spkac);\nconsole.log(challenge.toString('utf8'));\n// Prints: the challenge as a UTF8 string\nconst cert = require('crypto').Certificate();\nconst spkac = getSpkacSomehow();\nconst publicKey = cert.exportPublicKey(spkac);\nconsole.log(publicKey);\n// Prints: the public key as <Buffer ...>\nconst cert = require('crypto').Certificate();\nconst spkac = getSpkacSomehow();\nconsole.log(cert.verifySpkac(Buffer.from(spkac)));\n// Prints: true or false\nInstances of the Cipher class are used to encrypt data. The class can be\nused in one of two ways:
cipher.update() and cipher.final() methods to produce\nthe encrypted data.The crypto.createCipher() or crypto.createCipheriv() methods are\nused to create Cipher instances. Cipher objects are not to be created\ndirectly using the new keyword.
Example: Using Cipher objects as streams:
const crypto = require('crypto');\n\nconst algorithm = 'aes-192-cbc';\nconst password = 'Password used to generate key';\n// Key length is dependent on the algorithm. In this case for aes192, it is\n// 24 bytes (192 bits).\n// Use async `crypto.scrypt()` instead.\nconst key = crypto.scryptSync(password, 'salt', 24);\n// Use `crypto.randomBytes()` to generate a random iv instead of the static iv\n// shown here.\nconst iv = Buffer.alloc(16, 0); // Initialization vector.\n\nconst cipher = crypto.createCipheriv(algorithm, key, iv);\n\nlet encrypted = '';\ncipher.on('readable', () => {\n let chunk;\n while (null !== (chunk = cipher.read())) {\n encrypted += chunk.toString('hex');\n }\n});\ncipher.on('end', () => {\n console.log(encrypted);\n // Prints: e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa\n});\n\ncipher.write('some clear text data');\ncipher.end();\nExample: Using Cipher and piped streams:
const crypto = require('crypto');\nconst fs = require('fs');\n\nconst algorithm = 'aes-192-cbc';\nconst password = 'Password used to generate key';\n// Use the async `crypto.scrypt()` instead.\nconst key = crypto.scryptSync(password, 'salt', 24);\n// Use `crypto.randomBytes()` to generate a random iv instead of the static iv\n// shown here.\nconst iv = Buffer.alloc(16, 0); // Initialization vector.\n\nconst cipher = crypto.createCipheriv(algorithm, key, iv);\n\nconst input = fs.createReadStream('test.js');\nconst output = fs.createWriteStream('test.enc');\n\ninput.pipe(cipher).pipe(output);\nExample: Using the cipher.update() and cipher.final() methods:
const crypto = require('crypto');\n\nconst algorithm = 'aes-192-cbc';\nconst password = 'Password used to generate key';\n// Use the async `crypto.scrypt()` instead.\nconst key = crypto.scryptSync(password, 'salt', 24);\n// Use `crypto.randomBytes` to generate a random iv instead of the static iv\n// shown here.\nconst iv = Buffer.alloc(16, 0); // Initialization vector.\n\nconst cipher = crypto.createCipheriv(algorithm, key, iv);\n\nlet encrypted = cipher.update('some clear text data', 'utf8', 'hex');\nencrypted += cipher.final('hex');\nconsole.log(encrypted);\n// Prints: e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa\nOnce the cipher.final() method has been called, the Cipher object can no\nlonger be used to encrypt data. Attempts to call cipher.final() more than\nonce will result in an error being thrown.
When using an authenticated encryption mode (GCM, CCM and OCB are\ncurrently supported), the cipher.setAAD() method sets the value used for the\nadditional authenticated data (AAD) input parameter.
The options argument is optional for GCM and OCB. When using CCM, the\nplaintextLength option must be specified and its value must match the length\nof the plaintext in bytes. See CCM mode.
The cipher.setAAD() method must be called before cipher.update().
The cipher.getAuthTag() method should only be called after encryption has\nbeen completed using the cipher.final() method.
When using block encryption algorithms, the Cipher class will automatically\nadd padding to the input data to the appropriate block size. To disable the\ndefault padding call cipher.setAutoPadding(false).
When autoPadding is false, the length of the entire input data must be a\nmultiple of the cipher's block size or cipher.final() will throw an error.\nDisabling automatic padding is useful for non-standard padding, for instance\nusing 0x0 instead of PKCS padding.
The cipher.setAutoPadding() method must be called before\ncipher.final().
Updates the cipher with data. If the inputEncoding argument is given,\nthe data\nargument is a string using the specified encoding. If the inputEncoding\nargument is not given, data must be a Buffer, TypedArray, or\nDataView. If data is a Buffer, TypedArray, or DataView, then\ninputEncoding is ignored.
The outputEncoding specifies the output format of the enciphered\ndata. If the outputEncoding\nis specified, a string using the specified encoding is returned. If no\noutputEncoding is provided, a Buffer is returned.
The cipher.update() method can be called multiple times with new data until\ncipher.final() is called. Calling cipher.update() after\ncipher.final() will result in an error being thrown.
Instances of the Decipher class are used to decrypt data. The class can be\nused in one of two ways:
decipher.update() and decipher.final() methods to\nproduce the unencrypted data.The crypto.createDecipher() or crypto.createDecipheriv() methods are\nused to create Decipher instances. Decipher objects are not to be created\ndirectly using the new keyword.
Example: Using Decipher objects as streams:
const crypto = require('crypto');\n\nconst algorithm = 'aes-192-cbc';\nconst password = 'Password used to generate key';\n// Key length is dependent on the algorithm. In this case for aes192, it is\n// 24 bytes (192 bits).\n// Use the async `crypto.scrypt()` instead.\nconst key = crypto.scryptSync(password, 'salt', 24);\n// The IV is usually passed along with the ciphertext.\nconst iv = Buffer.alloc(16, 0); // Initialization vector.\n\nconst decipher = crypto.createDecipheriv(algorithm, key, iv);\n\nlet decrypted = '';\ndecipher.on('readable', () => {\n while (null !== (chunk = decipher.read())) {\n decrypted += chunk.toString('utf8');\n }\n});\ndecipher.on('end', () => {\n console.log(decrypted);\n // Prints: some clear text data\n});\n\n// Encrypted with same algorithm, key and iv.\nconst encrypted =\n 'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa';\ndecipher.write(encrypted, 'hex');\ndecipher.end();\nExample: Using Decipher and piped streams:
const crypto = require('crypto');\nconst fs = require('fs');\n\nconst algorithm = 'aes-192-cbc';\nconst password = 'Password used to generate key';\n// Use the async `crypto.scrypt()` instead.\nconst key = crypto.scryptSync(password, 'salt', 24);\n// The IV is usually passed along with the ciphertext.\nconst iv = Buffer.alloc(16, 0); // Initialization vector.\n\nconst decipher = crypto.createDecipheriv(algorithm, key, iv);\n\nconst input = fs.createReadStream('test.enc');\nconst output = fs.createWriteStream('test.js');\n\ninput.pipe(decipher).pipe(output);\nExample: Using the decipher.update() and decipher.final() methods:
const crypto = require('crypto');\n\nconst algorithm = 'aes-192-cbc';\nconst password = 'Password used to generate key';\n// Use the async `crypto.scrypt()` instead.\nconst key = crypto.scryptSync(password, 'salt', 24);\n// The IV is usually passed along with the ciphertext.\nconst iv = Buffer.alloc(16, 0); // Initialization vector.\n\nconst decipher = crypto.createDecipheriv(algorithm, key, iv);\n\n// Encrypted using same algorithm, key and iv.\nconst encrypted =\n 'e5f79c5915c02171eec6b212d5520d44480993d7d622a7c4c2da32f6efda0ffa';\nlet decrypted = decipher.update(encrypted, 'hex', 'utf8');\ndecrypted += decipher.final('utf8');\nconsole.log(decrypted);\n// Prints: some clear text data\nOnce the decipher.final() method has been called, the Decipher object can\nno longer be used to decrypt data. Attempts to call decipher.final() more\nthan once will result in an error being thrown.
When using an authenticated encryption mode (GCM, CCM and OCB are\ncurrently supported), the decipher.setAAD() method sets the value used for the\nadditional authenticated data (AAD) input parameter.
The options argument is optional for GCM. When using CCM, the\nplaintextLength option must be specified and its value must match the length\nof the ciphertext in bytes. See CCM mode.
The decipher.setAAD() method must be called before decipher.update().
When using an authenticated encryption mode (GCM, CCM and OCB are\ncurrently supported), the decipher.setAuthTag() method is used to pass in the\nreceived authentication tag. If no tag is provided, or if the cipher text\nhas been tampered with, decipher.final() will throw, indicating that the\ncipher text should be discarded due to failed authentication. If the tag length\nis invalid according to NIST SP 800-38D or does not match the value of the\nauthTagLength option, decipher.setAuthTag() will throw an error.
The decipher.setAuthTag() method must be called before decipher.update()\nfor CCM mode or before decipher.final() for GCM and OCB modes.\ndecipher.setAuthTag() can only be called once.
When data has been encrypted without standard block padding, calling\ndecipher.setAutoPadding(false) will disable automatic padding to prevent\ndecipher.final() from checking for and removing padding.
Turning auto padding off will only work if the input data's length is a\nmultiple of the ciphers block size.
\nThe decipher.setAutoPadding() method must be called before\ndecipher.final().
Updates the decipher with data. If the inputEncoding argument is given,\nthe data\nargument is a string using the specified encoding. If the inputEncoding\nargument is not given, data must be a Buffer. If data is a\nBuffer then inputEncoding is ignored.
The outputEncoding specifies the output format of the enciphered\ndata. If the outputEncoding\nis specified, a string using the specified encoding is returned. If no\noutputEncoding is provided, a Buffer is returned.
The decipher.update() method can be called multiple times with new data until\ndecipher.final() is called. Calling decipher.update() after\ndecipher.final() will result in an error being thrown.
The DiffieHellman class is a utility for creating Diffie-Hellman key\nexchanges.
Instances of the DiffieHellman class can be created using the\ncrypto.createDiffieHellman() function.
const crypto = require('crypto');\nconst assert = require('assert');\n\n// Generate Alice's keys...\nconst alice = crypto.createDiffieHellman(2048);\nconst aliceKey = alice.generateKeys();\n\n// Generate Bob's keys...\nconst bob = crypto.createDiffieHellman(alice.getPrime(), alice.getGenerator());\nconst bobKey = bob.generateKeys();\n\n// Exchange and generate the secret...\nconst aliceSecret = alice.computeSecret(bobKey);\nconst bobSecret = bob.computeSecret(aliceKey);\n\n// OK\nassert.strictEqual(aliceSecret.toString('hex'), bobSecret.toString('hex'));\nComputes the shared secret using otherPublicKey as the other\nparty's public key and returns the computed shared secret. The supplied\nkey is interpreted using the specified inputEncoding, and secret is\nencoded using specified outputEncoding.\nIf the inputEncoding is not\nprovided, otherPublicKey is expected to be a Buffer,\nTypedArray, or DataView.
If outputEncoding is given a string is returned; otherwise, a\nBuffer is returned.
Generates private and public Diffie-Hellman key values, and returns\nthe public key in the specified encoding. This key should be\ntransferred to the other party.\nIf encoding is provided a string is returned; otherwise a\nBuffer is returned.
Returns the Diffie-Hellman generator in the specified encoding.\nIf encoding is provided a string is\nreturned; otherwise a Buffer is returned.
Returns the Diffie-Hellman prime in the specified encoding.\nIf encoding is provided a string is\nreturned; otherwise a Buffer is returned.
Returns the Diffie-Hellman private key in the specified encoding.\nIf encoding is provided a\nstring is returned; otherwise a Buffer is returned.
Returns the Diffie-Hellman public key in the specified encoding.\nIf encoding is provided a\nstring is returned; otherwise a Buffer is returned.
Sets the Diffie-Hellman private key. If the encoding argument is provided,\nprivateKey is expected\nto be a string. If no encoding is provided, privateKey is expected\nto be a Buffer, TypedArray, or DataView.
Sets the Diffie-Hellman public key. If the encoding argument is provided,\npublicKey is expected\nto be a string. If no encoding is provided, publicKey is expected\nto be a Buffer, TypedArray, or DataView.
A bit field containing any warnings and/or errors resulting from a check\nperformed during initialization of the DiffieHellman object.
The following values are valid for this property (as defined in constants\nmodule):
DH_CHECK_P_NOT_SAFE_PRIMEDH_CHECK_P_NOT_PRIMEDH_UNABLE_TO_CHECK_GENERATORDH_NOT_SUITABLE_GENERATORThe DiffieHellmanGroup class takes a well-known modp group as its argument but\notherwise works the same as DiffieHellman.
const name = 'modp1';\nconst dh = crypto.createDiffieHellmanGroup(name);\nname is taken from RFC 2412 (modp1 and 2) and RFC 3526:
$ perl -ne 'print \"$1\\n\" if /\"(modp\\d+)\"/' src/node_crypto_groups.h\nmodp1 # 768 bits\nmodp2 # 1024 bits\nmodp5 # 1536 bits\nmodp14 # 2048 bits\nmodp15 # etc.\nmodp16\nmodp17\nmodp18\nThe ECDH class is a utility for creating Elliptic Curve Diffie-Hellman (ECDH)\nkey exchanges.
Instances of the ECDH class can be created using the\ncrypto.createECDH() function.
const crypto = require('crypto');\nconst assert = require('assert');\n\n// Generate Alice's keys...\nconst alice = crypto.createECDH('secp521r1');\nconst aliceKey = alice.generateKeys();\n\n// Generate Bob's keys...\nconst bob = crypto.createECDH('secp521r1');\nconst bobKey = bob.generateKeys();\n\n// Exchange and generate the secret...\nconst aliceSecret = alice.computeSecret(bobKey);\nconst bobSecret = bob.computeSecret(aliceKey);\n\nassert.strictEqual(aliceSecret.toString('hex'), bobSecret.toString('hex'));\n// OK\nConverts the EC Diffie-Hellman public key specified by key and curve to the\nformat specified by format. The format argument specifies point encoding\nand can be 'compressed', 'uncompressed' or 'hybrid'. The supplied key is\ninterpreted using the specified inputEncoding, and the returned key is encoded\nusing the specified outputEncoding.
Use crypto.getCurves() to obtain a list of available curve names.\nOn recent OpenSSL releases, openssl ecparam -list_curves will also display\nthe name and description of each available elliptic curve.
If format is not specified the point will be returned in 'uncompressed'\nformat.
If the inputEncoding is not provided, key is expected to be a Buffer,\nTypedArray, or DataView.
Example (uncompressing a key):
\nconst { createECDH, ECDH } = require('crypto');\n\nconst ecdh = createECDH('secp256k1');\necdh.generateKeys();\n\nconst compressedKey = ecdh.getPublicKey('hex', 'compressed');\n\nconst uncompressedKey = ECDH.convertKey(compressedKey,\n 'secp256k1',\n 'hex',\n 'hex',\n 'uncompressed');\n\n// The converted key and the uncompressed public key should be the same\nconsole.log(uncompressedKey === ecdh.getPublicKey('hex'));\nComputes the shared secret using otherPublicKey as the other\nparty's public key and returns the computed shared secret. The supplied\nkey is interpreted using specified inputEncoding, and the returned secret\nis encoded using the specified outputEncoding.\nIf the inputEncoding is not\nprovided, otherPublicKey is expected to be a Buffer, TypedArray, or\nDataView.
If outputEncoding is given a string will be returned; otherwise a\nBuffer is returned.
ecdh.computeSecret will throw an\nERR_CRYPTO_ECDH_INVALID_PUBLIC_KEY error when otherPublicKey\nlies outside of the elliptic curve. Since otherPublicKey is\nusually supplied from a remote user over an insecure network,\nits recommended for developers to handle this exception accordingly.
Generates private and public EC Diffie-Hellman key values, and returns\nthe public key in the specified format and encoding. This key should be\ntransferred to the other party.
The format argument specifies point encoding and can be 'compressed' or\n'uncompressed'. If format is not specified, the point will be returned in\n'uncompressed' format.
If encoding is provided a string is returned; otherwise a Buffer\nis returned.
If encoding is specified, a string is returned; otherwise a Buffer is\nreturned.
The format argument specifies point encoding and can be 'compressed' or\n'uncompressed'. If format is not specified the point will be returned in\n'uncompressed' format.
If encoding is specified, a string is returned; otherwise a Buffer is\nreturned.
Sets the EC Diffie-Hellman private key.\nIf encoding is provided, privateKey is expected\nto be a string; otherwise privateKey is expected to be a Buffer,\nTypedArray, or DataView.
If privateKey is not valid for the curve specified when the ECDH object was\ncreated, an error is thrown. Upon setting the private key, the associated\npublic point (key) is also generated and set in the ECDH object.
Sets the EC Diffie-Hellman public key.\nIf encoding is provided publicKey is expected to\nbe a string; otherwise a Buffer, TypedArray, or DataView is expected.
There is not normally a reason to call this method because ECDH\nonly requires a private key and the other party's public key to compute the\nshared secret. Typically either ecdh.generateKeys() or\necdh.setPrivateKey() will be called. The ecdh.setPrivateKey() method\nattempts to generate the public point/key associated with the private key being\nset.
Example (obtaining a shared secret):
\nconst crypto = require('crypto');\nconst alice = crypto.createECDH('secp256k1');\nconst bob = crypto.createECDH('secp256k1');\n\n// This is a shortcut way of specifying one of Alice's previous private\n// keys. It would be unwise to use such a predictable private key in a real\n// application.\nalice.setPrivateKey(\n crypto.createHash('sha256').update('alice', 'utf8').digest()\n);\n\n// Bob uses a newly generated cryptographically strong\n// pseudorandom key pair\nbob.generateKeys();\n\nconst aliceSecret = alice.computeSecret(bob.getPublicKey(), null, 'hex');\nconst bobSecret = bob.computeSecret(alice.getPublicKey(), null, 'hex');\n\n// aliceSecret and bobSecret should be the same shared secret value\nconsole.log(aliceSecret === bobSecret);\nThe Hash class is a utility for creating hash digests of data. It can be\nused in one of two ways:
hash.update() and hash.digest() methods to produce the\ncomputed hash.The crypto.createHash() method is used to create Hash instances. Hash\nobjects are not to be created directly using the new keyword.
Example: Using Hash objects as streams:
const crypto = require('crypto');\nconst hash = crypto.createHash('sha256');\n\nhash.on('readable', () => {\n // Only one element is going to be produced by the\n // hash stream.\n const data = hash.read();\n if (data) {\n console.log(data.toString('hex'));\n // Prints:\n // 6a2da20943931e9834fc12cfe5bb47bbd9ae43489a30726962b576f4e3993e50\n }\n});\n\nhash.write('some data to hash');\nhash.end();\nExample: Using Hash and piped streams:
const crypto = require('crypto');\nconst fs = require('fs');\nconst hash = crypto.createHash('sha256');\n\nconst input = fs.createReadStream('test.js');\ninput.pipe(hash).pipe(process.stdout);\nExample: Using the hash.update() and hash.digest() methods:
const crypto = require('crypto');\nconst hash = crypto.createHash('sha256');\n\nhash.update('some data to hash');\nconsole.log(hash.digest('hex'));\n// Prints:\n// 6a2da20943931e9834fc12cfe5bb47bbd9ae43489a30726962b576f4e3993e50\nCreates a new Hash object that contains a deep copy of the internal state\nof the current Hash object.
The optional options argument controls stream behavior. For XOF hash\nfunctions such as 'shake256', the outputLength option can be used to\nspecify the desired output length in bytes.
An error is thrown when an attempt is made to copy the Hash object after\nits hash.digest() method has been called.
// Calculate a rolling hash.\nconst crypto = require('crypto');\nconst hash = crypto.createHash('sha256');\n\nhash.update('one');\nconsole.log(hash.copy().digest('hex'));\n\nhash.update('two');\nconsole.log(hash.copy().digest('hex'));\n\nhash.update('three');\nconsole.log(hash.copy().digest('hex'));\n\n// Etc.\nCalculates the digest of all of the data passed to be hashed (using the\nhash.update() method).\nIf encoding is provided a string will be returned; otherwise\na Buffer is returned.
The Hash object can not be used again after hash.digest() method has been\ncalled. Multiple calls will cause an error to be thrown.
Updates the hash content with the given data, the encoding of which\nis given in inputEncoding.\nIf encoding is not provided, and the data is a string, an\nencoding of 'utf8' is enforced. If data is a Buffer, TypedArray, or\nDataView, then inputEncoding is ignored.
This can be called many times with new data as it is streamed.
" } ] }, { "textRaw": "Class: `Hmac`", "type": "class", "name": "Hmac", "meta": { "added": [ "v0.1.94" ], "changes": [] }, "desc": "The Hmac class is a utility for creating cryptographic HMAC digests. It can\nbe used in one of two ways:
hmac.update() and hmac.digest() methods to produce the\ncomputed HMAC digest.The crypto.createHmac() method is used to create Hmac instances. Hmac\nobjects are not to be created directly using the new keyword.
Example: Using Hmac objects as streams:
const crypto = require('crypto');\nconst hmac = crypto.createHmac('sha256', 'a secret');\n\nhmac.on('readable', () => {\n // Only one element is going to be produced by the\n // hash stream.\n const data = hmac.read();\n if (data) {\n console.log(data.toString('hex'));\n // Prints:\n // 7fd04df92f636fd450bc841c9418e5825c17f33ad9c87c518115a45971f7f77e\n }\n});\n\nhmac.write('some data to hash');\nhmac.end();\nExample: Using Hmac and piped streams:
const crypto = require('crypto');\nconst fs = require('fs');\nconst hmac = crypto.createHmac('sha256', 'a secret');\n\nconst input = fs.createReadStream('test.js');\ninput.pipe(hmac).pipe(process.stdout);\nExample: Using the hmac.update() and hmac.digest() methods:
const crypto = require('crypto');\nconst hmac = crypto.createHmac('sha256', 'a secret');\n\nhmac.update('some data to hash');\nconsole.log(hmac.digest('hex'));\n// Prints:\n// 7fd04df92f636fd450bc841c9418e5825c17f33ad9c87c518115a45971f7f77e\nCalculates the HMAC digest of all of the data passed using hmac.update().\nIf encoding is\nprovided a string is returned; otherwise a Buffer is returned;
The Hmac object can not be used again after hmac.digest() has been\ncalled. Multiple calls to hmac.digest() will result in an error being thrown.
Updates the Hmac content with the given data, the encoding of which\nis given in inputEncoding.\nIf encoding is not provided, and the data is a string, an\nencoding of 'utf8' is enforced. If data is a Buffer, TypedArray, or\nDataView, then inputEncoding is ignored.
This can be called many times with new data as it is streamed.
" } ] }, { "textRaw": "Class: `KeyObject`", "type": "class", "name": "KeyObject", "meta": { "added": [ "v11.6.0" ], "changes": [ { "version": "v14.5.0", "pr-url": "https://github.com/nodejs/node/pull/33360", "description": "Instances of this class can now be passed to worker threads using `postMessage`." }, { "version": "v11.13.0", "pr-url": "https://github.com/nodejs/node/pull/26438", "description": "This class is now exported." } ] }, "desc": "Node.js uses a KeyObject class to represent a symmetric or asymmetric key,\nand each kind of key exposes different functions. The\ncrypto.createSecretKey(), crypto.createPublicKey() and\ncrypto.createPrivateKey() methods are used to create KeyObject\ninstances. KeyObject objects are not to be created directly using the new\nkeyword.
Most applications should consider using the new KeyObject API instead of\npassing keys as strings or Buffers due to improved security features.
KeyObject instances can be passed to other threads via postMessage().\nThe receiver obtains a cloned KeyObject, and the KeyObject does not need to\nbe listed in the transferList argument.
For asymmetric keys, this property represents the type of the key. Supported key\ntypes are:
\n'rsa' (OID 1.2.840.113549.1.1.1)'rsa-pss' (OID 1.2.840.113549.1.1.10)'dsa' (OID 1.2.840.10040.4.1)'ec' (OID 1.2.840.10045.2.1)'x25519' (OID 1.3.101.110)'x448' (OID 1.3.101.111)'ed25519' (OID 1.3.101.112)'ed448' (OID 1.3.101.113)'dh' (OID 1.2.840.113549.1.3.1)This property is undefined for unrecognized KeyObject types and symmetric\nkeys.
For secret keys, this property represents the size of the key in bytes. This\nproperty is undefined for asymmetric keys.
Depending on the type of this KeyObject, this property is either\n'secret' for secret (symmetric) keys, 'public' for public (asymmetric) keys\nor 'private' for private (asymmetric) keys.
For symmetric keys, this function allocates a Buffer containing the key\nmaterial and ignores any options.
For asymmetric keys, the options parameter is used to determine the export\nformat.
For public keys, the following encoding options can be used:
\ntype: <string> Must be one of 'pkcs1' (RSA only) or 'spki'.format: <string> Must be 'pem' or 'der'.For private keys, the following encoding options can be used:
\ntype: <string> Must be one of 'pkcs1' (RSA only), 'pkcs8' or\n'sec1' (EC only).format: <string> Must be 'pem' or 'der'.cipher: <string> If specified, the private key will be encrypted with\n the given cipher and passphrase using PKCS#5 v2.0 password based\nencryption.passphrase: <string> | <Buffer> The passphrase to use for encryption, see\ncipher.When PEM encoding was selected, the result will be a string, otherwise it will\nbe a buffer containing the data encoded as DER.
\nPKCS#1, SEC1, and PKCS#8 type keys can be encrypted by using a combination of\nthe cipher and format options. The PKCS#8 type can be used with any\nformat to encrypt any key algorithm (RSA, EC, or DH) by specifying a\ncipher. PKCS#1 and SEC1 can only be encrypted by specifying a cipher\nwhen the PEM format is used. For maximum compatibility, use PKCS#8 for\nencrypted private keys. Since PKCS#8 defines its own\nencryption mechanism, PEM-level encryption is not supported when encrypting\na PKCS#8 key. See RFC 5208 for PKCS#8 encryption and RFC 1421 for\nPKCS#1 and SEC1 encryption.
The Sign class is a utility for generating signatures. It can be used in one\nof two ways:
sign.sign() method is used to generate and return the signature, orsign.update() and sign.sign() methods to produce the\nsignature.The crypto.createSign() method is used to create Sign instances. The\nargument is the string name of the hash function to use. Sign objects are not\nto be created directly using the new keyword.
Example: Using Sign and Verify objects as streams:
const crypto = require('crypto');\n\nconst { privateKey, publicKey } = crypto.generateKeyPairSync('ec', {\n namedCurve: 'sect239k1'\n});\n\nconst sign = crypto.createSign('SHA256');\nsign.write('some data to sign');\nsign.end();\nconst signature = sign.sign(privateKey, 'hex');\n\nconst verify = crypto.createVerify('SHA256');\nverify.write('some data to sign');\nverify.end();\nconsole.log(verify.verify(publicKey, signature, 'hex'));\n// Prints: true\nExample: Using the sign.update() and verify.update() methods:
const crypto = require('crypto');\n\nconst { privateKey, publicKey } = crypto.generateKeyPairSync('rsa', {\n modulusLength: 2048,\n});\n\nconst sign = crypto.createSign('SHA256');\nsign.update('some data to sign');\nsign.end();\nconst signature = sign.sign(privateKey);\n\nconst verify = crypto.createVerify('SHA256');\nverify.update('some data to sign');\nverify.end();\nconsole.log(verify.verify(publicKey, signature));\n// Prints: true\nCalculates the signature on all the data passed through using either\nsign.update() or sign.write().
If privateKey is not a KeyObject, this function behaves as if\nprivateKey had been passed to crypto.createPrivateKey(). If it is an\nobject, the following additional properties can be passed:
dsaEncoding <string> For DSA and ECDSA, this option specifies the\nformat of the generated signature. It can be one of the following:
'der' (default): DER-encoded ASN.1 signature structure encoding (r, s).'ieee-p1363': Signature format r || s as proposed in IEEE-P1363.padding <integer> Optional padding value for RSA, one of the following:
crypto.constants.RSA_PKCS1_PADDING (default)crypto.constants.RSA_PKCS1_PSS_PADDINGRSA_PKCS1_PSS_PADDING will use MGF1 with the same hash function\nused to sign the message as specified in section 3.1 of RFC 4055, unless\nan MGF1 hash function has been specified as part of the key in compliance with\nsection 3.3 of RFC 4055.
saltLength <integer> Salt length for when padding is\nRSA_PKCS1_PSS_PADDING. The special value\ncrypto.constants.RSA_PSS_SALTLEN_DIGEST sets the salt length to the digest\nsize, crypto.constants.RSA_PSS_SALTLEN_MAX_SIGN (default) sets it to the\nmaximum permissible value.
If outputEncoding is provided a string is returned; otherwise a Buffer\nis returned.
The Sign object can not be again used after sign.sign() method has been\ncalled. Multiple calls to sign.sign() will result in an error being thrown.
Updates the Sign content with the given data, the encoding of which\nis given in inputEncoding.\nIf encoding is not provided, and the data is a string, an\nencoding of 'utf8' is enforced. If data is a Buffer, TypedArray, or\nDataView, then inputEncoding is ignored.
This can be called many times with new data as it is streamed.
" } ] }, { "textRaw": "Class: `Verify`", "type": "class", "name": "Verify", "meta": { "added": [ "v0.1.92" ], "changes": [] }, "desc": "The Verify class is a utility for verifying signatures. It can be used in one\nof two ways:
verify.update() and verify.verify() methods to verify\nthe signature.The crypto.createVerify() method is used to create Verify instances.\nVerify objects are not to be created directly using the new keyword.
See Sign for examples.
Updates the Verify content with the given data, the encoding of which\nis given in inputEncoding.\nIf inputEncoding is not provided, and the data is a string, an\nencoding of 'utf8' is enforced. If data is a Buffer, TypedArray, or\nDataView, then inputEncoding is ignored.
This can be called many times with new data as it is streamed.
" }, { "textRaw": "`verify.verify(object, signature[, signatureEncoding])`", "type": "method", "name": "verify", "meta": { "added": [ "v0.1.92" ], "changes": [ { "version": "v12.0.0", "pr-url": "https://github.com/nodejs/node/pull/26960", "description": "This function now supports RSA-PSS keys." }, { "version": "v11.7.0", "pr-url": "https://github.com/nodejs/node/pull/25217", "description": "The key can now be a private key." }, { "version": "v8.0.0", "pr-url": "https://github.com/nodejs/node/pull/11705", "description": "Support for RSASSA-PSS and additional options was added." } ] }, "signatures": [ { "return": { "textRaw": "Returns: {boolean} `true` or `false` depending on the validity of the signature for the data and public key.", "name": "return", "type": "boolean", "desc": "`true` or `false` depending on the validity of the signature for the data and public key." }, "params": [ { "textRaw": "`object` {Object | string | Buffer | KeyObject}", "name": "object", "type": "Object | string | Buffer | KeyObject", "options": [ { "textRaw": "`dsaEncoding` {string}", "name": "dsaEncoding", "type": "string" }, { "textRaw": "`padding` {integer}", "name": "padding", "type": "integer" }, { "textRaw": "`saltLength` {integer}", "name": "saltLength", "type": "integer" } ] }, { "textRaw": "`signature` {string | Buffer | TypedArray | DataView}", "name": "signature", "type": "string | Buffer | TypedArray | DataView" }, { "textRaw": "`signatureEncoding` {string} The [encoding][] of the `signature` string.", "name": "signatureEncoding", "type": "string", "desc": "The [encoding][] of the `signature` string." } ] } ], "desc": "Verifies the provided data using the given object and signature.
If object is not a KeyObject, this function behaves as if\nobject had been passed to crypto.createPublicKey(). If it is an\nobject, the following additional properties can be passed:
dsaEncoding <string> For DSA and ECDSA, this option specifies the\nformat of the generated signature. It can be one of the following:
'der' (default): DER-encoded ASN.1 signature structure encoding (r, s).'ieee-p1363': Signature format r || s as proposed in IEEE-P1363.padding <integer> Optional padding value for RSA, one of the following:
crypto.constants.RSA_PKCS1_PADDING (default)crypto.constants.RSA_PKCS1_PSS_PADDINGRSA_PKCS1_PSS_PADDING will use MGF1 with the same hash function\nused to verify the message as specified in section 3.1 of RFC 4055, unless\nan MGF1 hash function has been specified as part of the key in compliance with\nsection 3.3 of RFC 4055.
saltLength <integer> Salt length for when padding is\nRSA_PKCS1_PSS_PADDING. The special value\ncrypto.constants.RSA_PSS_SALTLEN_DIGEST sets the salt length to the digest\nsize, crypto.constants.RSA_PSS_SALTLEN_AUTO (default) causes it to be\ndetermined automatically.
The signature argument is the previously calculated signature for the data, in\nthe signatureEncoding.\nIf a signatureEncoding is specified, the signature is expected to be a\nstring; otherwise signature is expected to be a Buffer,\nTypedArray, or DataView.
The verify object can not be used again after verify.verify() has been\ncalled. Multiple calls to verify.verify() will result in an error being\nthrown.
Because public keys can be derived from private keys, a private key may\nbe passed instead of a public key.
" } ] } ], "type": "module", "displayName": "Crypto" } ] }