node/lib/crypto.js at master · anchnk/node · GitHub

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// Copyright Joyent, Inc. and other Node contributors.

// Permission is hereby granted, free of charge, to any person obtaining a

// copy of this software and associated documentation files (the

// "Software"), to deal in the Software without restriction, including

// without limitation the rights to use, copy, modify, merge, publish,

// distribute, sublicense, and/or sell copies of the Software, and to permit

// persons to whom the Software is furnished to do so, subject to the

// following conditions:

// The above copyright notice and this permission notice shall be included

// in all copies or substantial portions of the Software.

// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS

// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN

// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,

// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR

// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE

// USE OR OTHER DEALINGS IN THE SOFTWARE.

// Note: In 0.8 and before, crypto functions all defaulted to using

// binary-encoded strings rather than buffers.

'use strict';

const internalUtil = require('internal/util');

internalUtil.assertCrypto();

exports.DEFAULT_ENCODING = 'buffer';

const constants = process.binding('constants').crypto;

const binding = process.binding('crypto');

const randomBytes = binding.randomBytes;

const getCiphers = binding.getCiphers;

const getHashes = binding.getHashes;

const getCurves = binding.getCurves;

const getFipsCrypto = binding.getFipsCrypto;

const setFipsCrypto = binding.setFipsCrypto;

const timingSafeEqual = binding.timingSafeEqual;

const Buffer = require('buffer').Buffer;

const kBufferMaxLength = require('buffer').kMaxLength;

const stream = require('stream');

const util = require('util');

const { isUint8Array } = process.binding('util');

const LazyTransform = require('internal/streams/lazy_transform');

const DH_GENERATOR = 2;

Object.defineProperty(exports, 'constants', {

configurable: false,

enumerable: true,

value: constants

});

// This is here because many functions accepted binary strings without

// any explicit encoding in older versions of node, and we don't want

// to break them unnecessarily.

function toBuf(str, encoding) {

if (typeof str === 'string') {

if (encoding === 'buffer' || !encoding)

encoding = 'utf8';

return Buffer.from(str, encoding);

}

return str;

}

exports._toBuf = toBuf;

const assert = require('assert');

const StringDecoder = require('string_decoder').StringDecoder;

exports.createHash = exports.Hash = Hash;

function Hash(algorithm, options) {

if (!(this instanceof Hash))

return new Hash(algorithm, options);

this._handle = new binding.Hash(algorithm);

LazyTransform.call(this, options);

}

util.inherits(Hash, LazyTransform);

Hash.prototype._transform = function _transform(chunk, encoding, callback) {

this._handle.update(chunk, encoding);

callback();

};

Hash.prototype._flush = function _flush(callback) {

this.push(this._handle.digest());

callback();

};

Hash.prototype.update = function update(data, encoding) {

encoding = encoding || exports.DEFAULT_ENCODING;

this._handle.update(data, encoding);

return this;

};

Hash.prototype.digest = function digest(outputEncoding) {

outputEncoding = outputEncoding || exports.DEFAULT_ENCODING;

// Explicit conversion for backward compatibility.

return this._handle.digest(`${outputEncoding}`);

};

exports.createHmac = exports.Hmac = Hmac;

function Hmac(hmac, key, options) {

if (!(this instanceof Hmac))

return new Hmac(hmac, key, options);

this._handle = new binding.Hmac();

this._handle.init(hmac, toBuf(key));

LazyTransform.call(this, options);

}

util.inherits(Hmac, LazyTransform);

Hmac.prototype.update = Hash.prototype.update;

Hmac.prototype.digest = Hash.prototype.digest;

Hmac.prototype._flush = Hash.prototype._flush;

Hmac.prototype._transform = Hash.prototype._transform;

function getDecoder(decoder, encoding) {

encoding = internalUtil.normalizeEncoding(encoding);

decoder = decoder || new StringDecoder(encoding);

assert(decoder.encoding === encoding, 'Cannot change encoding');

return decoder;

}

exports.createCipher = exports.Cipher = Cipher;

function Cipher(cipher, password, options) {

if (!(this instanceof Cipher))

return new Cipher(cipher, password, options);

this._handle = new binding.CipherBase(true);

this._handle.init(cipher, toBuf(password));

this._decoder = null;

LazyTransform.call(this, options);

}

util.inherits(Cipher, LazyTransform);

Cipher.prototype._transform = function _transform(chunk, encoding, callback) {

this.push(this._handle.update(chunk, encoding));

callback();

};

Cipher.prototype._flush = function _flush(callback) {

try {

this.push(this._handle.final());

} catch (e) {

callback(e);

return;

}

callback();

};

Cipher.prototype.update = function update(data, inputEncoding, outputEncoding) {

inputEncoding = inputEncoding || exports.DEFAULT_ENCODING;

outputEncoding = outputEncoding || exports.DEFAULT_ENCODING;

var ret = this._handle.update(data, inputEncoding);

if (outputEncoding && outputEncoding !== 'buffer') {

this._decoder = getDecoder(this._decoder, outputEncoding);

ret = this._decoder.write(ret);

}

return ret;

};

Cipher.prototype.final = function final(outputEncoding) {

outputEncoding = outputEncoding || exports.DEFAULT_ENCODING;

var ret = this._handle.final();

if (outputEncoding && outputEncoding !== 'buffer') {

this._decoder = getDecoder(this._decoder, outputEncoding);

ret = this._decoder.end(ret);

}

return ret;

};

Cipher.prototype.setAutoPadding = function setAutoPadding(ap) {

this._handle.setAutoPadding(ap);

return this;

};

Cipher.prototype.getAuthTag = function getAuthTag() {

return this._handle.getAuthTag();

};

Cipher.prototype.setAuthTag = function setAuthTag(tagbuf) {

this._handle.setAuthTag(tagbuf);

return this;

};

Cipher.prototype.setAAD = function setAAD(aadbuf) {

this._handle.setAAD(aadbuf);

return this;

};

exports.createCipheriv = exports.Cipheriv = Cipheriv;

function Cipheriv(cipher, key, iv, options) {

if (!(this instanceof Cipheriv))

return new Cipheriv(cipher, key, iv, options);

this._handle = new binding.CipherBase(true);

this._handle.initiv(cipher, toBuf(key), toBuf(iv));

this._decoder = null;

LazyTransform.call(this, options);

}

util.inherits(Cipheriv, LazyTransform);

Cipheriv.prototype._transform = Cipher.prototype._transform;

Cipheriv.prototype._flush = Cipher.prototype._flush;

Cipheriv.prototype.update = Cipher.prototype.update;

Cipheriv.prototype.final = Cipher.prototype.final;

Cipheriv.prototype.setAutoPadding = Cipher.prototype.setAutoPadding;

Cipheriv.prototype.getAuthTag = Cipher.prototype.getAuthTag;

Cipheriv.prototype.setAuthTag = Cipher.prototype.setAuthTag;

Cipheriv.prototype.setAAD = Cipher.prototype.setAAD;

exports.createDecipher = exports.Decipher = Decipher;

function Decipher(cipher, password, options) {

if (!(this instanceof Decipher))

return new Decipher(cipher, password, options);

this._handle = new binding.CipherBase(false);

this._handle.init(cipher, toBuf(password));

this._decoder = null;

LazyTransform.call(this, options);

}

util.inherits(Decipher, LazyTransform);

Decipher.prototype._transform = Cipher.prototype._transform;

Decipher.prototype._flush = Cipher.prototype._flush;

Decipher.prototype.update = Cipher.prototype.update;

Decipher.prototype.final = Cipher.prototype.final;

Decipher.prototype.finaltol = Cipher.prototype.final;

Decipher.prototype.setAutoPadding = Cipher.prototype.setAutoPadding;

Decipher.prototype.getAuthTag = Cipher.prototype.getAuthTag;

Decipher.prototype.setAuthTag = Cipher.prototype.setAuthTag;

Decipher.prototype.setAAD = Cipher.prototype.setAAD;

exports.createDecipheriv = exports.Decipheriv = Decipheriv;

function Decipheriv(cipher, key, iv, options) {

if (!(this instanceof Decipheriv))

return new Decipheriv(cipher, key, iv, options);

this._handle = new binding.CipherBase(false);

this._handle.initiv(cipher, toBuf(key), toBuf(iv));

this._decoder = null;

LazyTransform.call(this, options);

}

util.inherits(Decipheriv, LazyTransform);

Decipheriv.prototype._transform = Cipher.prototype._transform;

Decipheriv.prototype._flush = Cipher.prototype._flush;

Decipheriv.prototype.update = Cipher.prototype.update;

Decipheriv.prototype.final = Cipher.prototype.final;

Decipheriv.prototype.finaltol = Cipher.prototype.final;

Decipheriv.prototype.setAutoPadding = Cipher.prototype.setAutoPadding;

Decipheriv.prototype.getAuthTag = Cipher.prototype.getAuthTag;

Decipheriv.prototype.setAuthTag = Cipher.prototype.setAuthTag;

Decipheriv.prototype.setAAD = Cipher.prototype.setAAD;

exports.createSign = exports.Sign = Sign;

function Sign(algorithm, options) {

if (!(this instanceof Sign))

return new Sign(algorithm, options);

this._handle = new binding.Sign();

this._handle.init(algorithm);

stream.Writable.call(this, options);

}

util.inherits(Sign, stream.Writable);

Sign.prototype._write = function _write(chunk, encoding, callback) {

this._handle.update(chunk, encoding);

callback();

};

Sign.prototype.update = Hash.prototype.update;

Sign.prototype.sign = function sign(options, encoding) {

if (!options)

throw new Error('No key provided to sign');

var key = options.key || options;

var passphrase = options.passphrase || null;

// Options specific to RSA

var rsaPadding = constants.RSA_PKCS1_PADDING;

if (options.hasOwnProperty('padding')) {

if (options.padding === options.padding >> 0) {

rsaPadding = options.padding;

} else {

throw new TypeError('padding must be an integer');

}

var pssSaltLength = constants.RSA_PSS_SALTLEN_AUTO;

if (options.hasOwnProperty('saltLength')) {

if (options.saltLength === options.saltLength >> 0) {

pssSaltLength = options.saltLength;

} else {

throw new TypeError('saltLength must be an integer');

}

var ret = this._handle.sign(toBuf(key), passphrase, rsaPadding,

pssSaltLength);

encoding = encoding || exports.DEFAULT_ENCODING;

if (encoding && encoding !== 'buffer')

ret = ret.toString(encoding);

return ret;

};

exports.createVerify = exports.Verify = Verify;

function Verify(algorithm, options) {

if (!(this instanceof Verify))

return new Verify(algorithm, options);

this._handle = new binding.Verify();

this._handle.init(algorithm);

stream.Writable.call(this, options);

}

util.inherits(Verify, stream.Writable);

Verify.prototype._write = Sign.prototype._write;

Verify.prototype.update = Sign.prototype.update;

Verify.prototype.verify = function verify(options, signature, sigEncoding) {

var key = options.key || options;

sigEncoding = sigEncoding || exports.DEFAULT_ENCODING;

// Options specific to RSA

var rsaPadding = constants.RSA_PKCS1_PADDING;

if (options.hasOwnProperty('padding')) {

if (options.padding === options.padding >> 0) {

rsaPadding = options.padding;

} else {

throw new TypeError('padding must be an integer');

}

var pssSaltLength = constants.RSA_PSS_SALTLEN_AUTO;

if (options.hasOwnProperty('saltLength')) {

if (options.saltLength === options.saltLength >> 0) {

pssSaltLength = options.saltLength;

} else {

throw new TypeError('saltLength must be an integer');

}

return this._handle.verify(toBuf(key), toBuf(signature, sigEncoding),

rsaPadding, pssSaltLength);

};

function rsaPublic(method, defaultPadding) {

return function(options, buffer) {

var key = options.key || options;

var padding = options.padding || defaultPadding;

var passphrase = options.passphrase || null;

return method(toBuf(key), buffer, padding, passphrase);

};

}

function rsaPrivate(method, defaultPadding) {

return function(options, buffer) {

var key = options.key || options;

var passphrase = options.passphrase || null;

var padding = options.padding || defaultPadding;

return method(toBuf(key), buffer, padding, passphrase);

};

}

exports.publicEncrypt = rsaPublic(binding.publicEncrypt,

constants.RSA_PKCS1_OAEP_PADDING);

exports.publicDecrypt = rsaPublic(binding.publicDecrypt,

constants.RSA_PKCS1_PADDING);

exports.privateEncrypt = rsaPrivate(binding.privateEncrypt,

constants.RSA_PKCS1_PADDING);

exports.privateDecrypt = rsaPrivate(binding.privateDecrypt,

constants.RSA_PKCS1_OAEP_PADDING);

exports.createDiffieHellman = exports.DiffieHellman = DiffieHellman;

function DiffieHellman(sizeOrKey, keyEncoding, generator, genEncoding) {

if (!(this instanceof DiffieHellman))

return new DiffieHellman(sizeOrKey, keyEncoding, generator, genEncoding);

if (typeof sizeOrKey !== 'number' &&

typeof sizeOrKey !== 'string' &&

!ArrayBuffer.isView(sizeOrKey)) {

throw new TypeError('First argument should be number, string, ' +

'Buffer, TypedArray, or DataView');

}

if (keyEncoding) {

if (typeof keyEncoding !== 'string' ||

(!Buffer.isEncoding(keyEncoding) && keyEncoding !== 'buffer')) {

genEncoding = generator;

generator = keyEncoding;

keyEncoding = false;

}

keyEncoding = keyEncoding || exports.DEFAULT_ENCODING;

genEncoding = genEncoding || exports.DEFAULT_ENCODING;

if (typeof sizeOrKey !== 'number')

sizeOrKey = toBuf(sizeOrKey, keyEncoding);

if (!generator)

generator = DH_GENERATOR;

else if (typeof generator !== 'number')

generator = toBuf(generator, genEncoding);

this._handle = new binding.DiffieHellman(sizeOrKey, generator);

Object.defineProperty(this, 'verifyError', {

enumerable: true,

value: this._handle.verifyError,

writable: false

});

}

exports.DiffieHellmanGroup =

exports.createDiffieHellmanGroup =

exports.getDiffieHellman = DiffieHellmanGroup;

function DiffieHellmanGroup(name) {

if (!(this instanceof DiffieHellmanGroup))

return new DiffieHellmanGroup(name);

this._handle = new binding.DiffieHellmanGroup(name);

Object.defineProperty(this, 'verifyError', {

enumerable: true,

value: this._handle.verifyError,

writable: false

});

}

DiffieHellmanGroup.prototype.generateKeys =

DiffieHellman.prototype.generateKeys =

dhGenerateKeys;

function dhGenerateKeys(encoding) {

var keys = this._handle.generateKeys();

encoding = encoding || exports.DEFAULT_ENCODING;

if (encoding && encoding !== 'buffer')

keys = keys.toString(encoding);

return keys;

}

DiffieHellmanGroup.prototype.computeSecret =

DiffieHellman.prototype.computeSecret =

dhComputeSecret;

function dhComputeSecret(key, inEnc, outEnc) {

inEnc = inEnc || exports.DEFAULT_ENCODING;

outEnc = outEnc || exports.DEFAULT_ENCODING;

var ret = this._handle.computeSecret(toBuf(key, inEnc));

if (outEnc && outEnc !== 'buffer')

ret = ret.toString(outEnc);

return ret;

}

DiffieHellmanGroup.prototype.getPrime =

DiffieHellman.prototype.getPrime =

dhGetPrime;

function dhGetPrime(encoding) {

var prime = this._handle.getPrime();

encoding = encoding || exports.DEFAULT_ENCODING;

if (encoding && encoding !== 'buffer')

prime = prime.toString(encoding);

return prime;

}

DiffieHellmanGroup.prototype.getGenerator =

DiffieHellman.prototype.getGenerator =

dhGetGenerator;

function dhGetGenerator(encoding) {

var generator = this._handle.getGenerator();

encoding = encoding || exports.DEFAULT_ENCODING;

if (encoding && encoding !== 'buffer')

generator = generator.toString(encoding);

return generator;

}

DiffieHellmanGroup.prototype.getPublicKey =

DiffieHellman.prototype.getPublicKey =

dhGetPublicKey;

function dhGetPublicKey(encoding) {

var key = this._handle.getPublicKey();

encoding = encoding || exports.DEFAULT_ENCODING;

if (encoding && encoding !== 'buffer')

key = key.toString(encoding);

return key;

}

DiffieHellmanGroup.prototype.getPrivateKey =

DiffieHellman.prototype.getPrivateKey =

dhGetPrivateKey;

function dhGetPrivateKey(encoding) {

var key = this._handle.getPrivateKey();

encoding = encoding || exports.DEFAULT_ENCODING;

if (encoding && encoding !== 'buffer')

key = key.toString(encoding);

return key;

}

DiffieHellman.prototype.setPublicKey = function setPublicKey(key, encoding) {

encoding = encoding || exports.DEFAULT_ENCODING;

this._handle.setPublicKey(toBuf(key, encoding));

return this;

};

DiffieHellman.prototype.setPrivateKey = function setPrivateKey(key, encoding) {

encoding = encoding || exports.DEFAULT_ENCODING;

this._handle.setPrivateKey(toBuf(key, encoding));

return this;

};

function ECDH(curve) {

if (typeof curve !== 'string')

throw new TypeError('"curve" argument should be a string');

this._handle = new binding.ECDH(curve);

}

exports.createECDH = function createECDH(curve) {

return new ECDH(curve);

};

ECDH.prototype.computeSecret = DiffieHellman.prototype.computeSecret;

ECDH.prototype.setPrivateKey = DiffieHellman.prototype.setPrivateKey;

ECDH.prototype.setPublicKey = DiffieHellman.prototype.setPublicKey;

ECDH.prototype.getPrivateKey = DiffieHellman.prototype.getPrivateKey;

ECDH.prototype.generateKeys = function generateKeys(encoding, format) {

this._handle.generateKeys();

return this.getPublicKey(encoding, format);

};

ECDH.prototype.getPublicKey = function getPublicKey(encoding, format) {

var f;

if (format) {

if (typeof format === 'number')

f = format;

if (format === 'compressed')

f = constants.POINT_CONVERSION_COMPRESSED;

else if (format === 'hybrid')

f = constants.POINT_CONVERSION_HYBRID;

// Default

else if (format === 'uncompressed')

f = constants.POINT_CONVERSION_UNCOMPRESSED;

else

throw new TypeError('Bad format: ' + format);

} else {

f = constants.POINT_CONVERSION_UNCOMPRESSED;

}

var key = this._handle.getPublicKey(f);

encoding = encoding || exports.DEFAULT_ENCODING;

if (encoding && encoding !== 'buffer')

key = key.toString(encoding);

return key;

};

exports.pbkdf2 = function(password,

salt,

iterations,

keylen,

digest,

callback) {

if (typeof digest === 'function') {

callback = digest;

digest = undefined;

}

if (typeof callback !== 'function')

throw new Error('No callback provided to pbkdf2');

return pbkdf2(password, salt, iterations, keylen, digest, callback);

};

exports.pbkdf2Sync = function(password, salt, iterations, keylen, digest) {

return pbkdf2(password, salt, iterations, keylen, digest);

};

function pbkdf2(password, salt, iterations, keylen, digest, callback) {

if (digest === undefined) {

throw new TypeError(

'The "digest" argument is required and must not be undefined');

}

password = toBuf(password);

salt = toBuf(salt);

if (exports.DEFAULT_ENCODING === 'buffer')

return binding.PBKDF2(password, salt, iterations, keylen, digest, callback);

// at this point, we need to handle encodings.

var encoding = exports.DEFAULT_ENCODING;

if (callback) {

function next(er, ret) {

if (ret)

ret = ret.toString(encoding);

callback(er, ret);

}

binding.PBKDF2(password, salt, iterations, keylen, digest, next);

} else {

var ret = binding.PBKDF2(password, salt, iterations, keylen, digest);

return ret.toString(encoding);

}

exports.Certificate = Certificate;

function Certificate() {

if (!(this instanceof Certificate))

return new Certificate();

}

Certificate.prototype.verifySpkac = function verifySpkac(object) {

return binding.certVerifySpkac(object);

};

Certificate.prototype.exportPublicKey =

function exportPublicKey(object, encoding) {

return binding.certExportPublicKey(toBuf(object, encoding));

};

Certificate.prototype.exportChallenge =

function exportChallenge(object, encoding) {

return binding.certExportChallenge(toBuf(object, encoding));

};

exports.setEngine = function setEngine(id, flags) {

if (typeof id !== 'string')

throw new TypeError('"id" argument should be a string');

if (flags && typeof flags !== 'number')

throw new TypeError('"flags" argument should be a number, if present');

flags = flags >>> 0;

// Use provided engine for everything by default

if (flags === 0)

flags = constants.ENGINE_METHOD_ALL;

return binding.setEngine(id, flags);

};

const kMaxUint32 = Math.pow(2, 32) - 1;

function randomFillSync(buf, offset = 0, size) {

if (!isUint8Array(buf)) {

throw new TypeError('"buf" argument must be a Buffer or Uint8Array');

}

assertOffset(offset, buf.length);

if (size === undefined) size = buf.length - offset;

assertSize(size, offset, buf.length);

return binding.randomFill(buf, offset, size);

}

exports.randomFillSync = randomFillSync;

function randomFill(buf, offset, size, cb) {

if (!isUint8Array(buf)) {

throw new TypeError('"buf" argument must be a Buffer or Uint8Array');

}

if (typeof offset === 'function') {

cb = offset;

offset = 0;

size = buf.length;

} else if (typeof size === 'function') {

cb = size;

size = buf.length - offset;

} else if (typeof cb !== 'function') {

throw new TypeError('"cb" argument must be a function');

}

assertOffset(offset, buf.length);

assertSize(size, offset, buf.length);

return binding.randomFill(buf, offset, size, cb);

}

exports.randomFill = randomFill;

function assertOffset(offset, length) {

if (typeof offset !== 'number' || offset !== offset) {

throw new TypeError('offset must be a number');

}

if (offset > kMaxUint32 || offset < 0) {

throw new TypeError('offset must be a uint32');

}

if (offset > kBufferMaxLength || offset > length) {

throw new RangeError('offset out of range');

}

function assertSize(size, offset, length) {

if (typeof size !== 'number' || size !== size) {

throw new TypeError('size must be a number');

}

if (size > kMaxUint32 || size < 0) {

throw new TypeError('size must be a uint32');

}

if (size + offset > length || size > kBufferMaxLength) {

throw new RangeError('buffer too small');

}

exports.randomBytes = exports.pseudoRandomBytes = randomBytes;

exports.rng = exports.prng = randomBytes;

exports.getCiphers = internalUtil.cachedResult(

() => internalUtil.filterDuplicateStrings(getCiphers())

);

exports.getHashes = internalUtil.cachedResult(

() => internalUtil.filterDuplicateStrings(getHashes())

);

exports.getCurves = internalUtil.cachedResult(

() => internalUtil.filterDuplicateStrings(getCurves())

);

Object.defineProperty(exports, 'fips', {

get: getFipsCrypto,

set: setFipsCrypto

});

exports.timingSafeEqual = timingSafeEqual;

// Legacy API

Object.defineProperty(exports, 'createCredentials', {

configurable: true,

enumerable: true,

get: internalUtil.deprecate(function() {

return require('tls').createSecureContext;

}, 'crypto.createCredentials is deprecated. ' +

'Use tls.createSecureContext instead.', 'DEP0010')

});

Object.defineProperty(exports, 'Credentials', {

configurable: true,

enumerable: true,

get: internalUtil.deprecate(function() {

return require('tls').SecureContext;

}, 'crypto.Credentials is deprecated. ' +

'Use tls.SecureContext instead.', 'DEP0011')

});

node/lib/crypto.js at master · anchnk/node · GitHub

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