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const {
ArrayBufferPrototypeSlice,
FunctionPrototypeCall,
MathCeil,
ObjectDefineProperty,
Promise,
SafeSet,
} = primordials;
const { Buffer } = require('buffer');
const {
DiffieHellman: _DiffieHellman,
DiffieHellmanGroup: _DiffieHellmanGroup,
ECDH: _ECDH,
ECDHBitsJob,
ECDHConvertKey: _ECDHConvertKey,
statelessDH,
kCryptoJobAsync,
} = internalBinding('crypto');
const {
codes: {
ERR_CRYPTO_ECDH_INVALID_FORMAT,
ERR_CRYPTO_ECDH_INVALID_PUBLIC_KEY,
ERR_CRYPTO_INCOMPATIBLE_KEY,
ERR_CRYPTO_INVALID_KEY_OBJECT_TYPE,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
}
} = require('internal/errors');
const {
validateFunction,
validateInt32,
validateObject,
validateString,
validateUint32,
} = require('internal/validators');
const {
isArrayBufferView,
isAnyArrayBuffer,
} = require('internal/util/types');
const {
lazyDOMException,
} = require('internal/util');
const {
KeyObject,
isCryptoKey,
} = require('internal/crypto/keys');
const {
getArrayBufferOrView,
getDefaultEncoding,
toBuf,
kHandle,
kKeyObject,
} = require('internal/crypto/util');
const {
crypto: {
POINT_CONVERSION_COMPRESSED,
POINT_CONVERSION_HYBRID,
POINT_CONVERSION_UNCOMPRESSED,
}
} = internalBinding('constants');
const DH_GENERATOR = 2;
function DiffieHellman(sizeOrKey, keyEncoding, generator, genEncoding) {
if (!(this instanceof DiffieHellman))
return new DiffieHellman(sizeOrKey, keyEncoding, generator, genEncoding);
if (typeof sizeOrKey !== 'number' &&
typeof sizeOrKey !== 'string' &&
!isArrayBufferView(sizeOrKey) &&
!isAnyArrayBuffer(sizeOrKey)) {
throw new ERR_INVALID_ARG_TYPE(
'sizeOrKey',
['number', 'string', 'ArrayBuffer', 'Buffer', 'TypedArray', 'DataView'],
sizeOrKey
);
}
// Sizes < 0 don't make sense but they _are_ accepted (and subsequently
// rejected with ERR_OSSL_BN_BITS_TOO_SMALL) by OpenSSL. The glue code
// in node_crypto.cc accepts values that are IsInt32() for that reason
// and that's why we do that here too.
if (typeof sizeOrKey === 'number')
validateInt32(sizeOrKey, 'sizeOrKey');
if (keyEncoding && !Buffer.isEncoding(keyEncoding) &&
keyEncoding !== 'buffer') {
genEncoding = generator;
generator = keyEncoding;
keyEncoding = false;
}
const encoding = getDefaultEncoding();
keyEncoding = keyEncoding || encoding;
genEncoding = genEncoding || encoding;
if (typeof sizeOrKey !== 'number')
sizeOrKey = toBuf(sizeOrKey, keyEncoding);
if (!generator) {
generator = DH_GENERATOR;
} else if (typeof generator === 'number') {
validateInt32(generator, 'generator');
} else if (typeof generator === 'string') {
generator = toBuf(generator, genEncoding);
} else if (!isArrayBufferView(generator) && !isAnyArrayBuffer(generator)) {
throw new ERR_INVALID_ARG_TYPE(
'generator',
['number', 'string', 'ArrayBuffer', 'Buffer', 'TypedArray', 'DataView'],
generator
);
}
this[kHandle] = new _DiffieHellman(sizeOrKey, generator);
ObjectDefineProperty(this, 'verifyError', {
__proto__: null,
enumerable: true,
value: this[kHandle].verifyError,
writable: false
});
}
function DiffieHellmanGroup(name) {
if (!(this instanceof DiffieHellmanGroup))
return new DiffieHellmanGroup(name);
this[kHandle] = new _DiffieHellmanGroup(name);
ObjectDefineProperty(this, 'verifyError', {
__proto__: null,
enumerable: true,
value: this[kHandle].verifyError,
writable: false
});
}
DiffieHellmanGroup.prototype.generateKeys =
DiffieHellman.prototype.generateKeys =
dhGenerateKeys;
function dhGenerateKeys(encoding) {
const keys = this[kHandle].generateKeys();
encoding = encoding || getDefaultEncoding();
return encode(keys, encoding);
}
DiffieHellmanGroup.prototype.computeSecret =
DiffieHellman.prototype.computeSecret =
dhComputeSecret;
function dhComputeSecret(key, inEnc, outEnc) {
const encoding = getDefaultEncoding();
inEnc = inEnc || encoding;
outEnc = outEnc || encoding;
key = getArrayBufferOrView(key, 'key', inEnc);
const ret = this[kHandle].computeSecret(key);
if (typeof ret === 'string')
throw new ERR_CRYPTO_ECDH_INVALID_PUBLIC_KEY();
return encode(ret, outEnc);
}
DiffieHellmanGroup.prototype.getPrime =
DiffieHellman.prototype.getPrime =
dhGetPrime;
function dhGetPrime(encoding) {
const prime = this[kHandle].getPrime();
encoding = encoding || getDefaultEncoding();
return encode(prime, encoding);
}
DiffieHellmanGroup.prototype.getGenerator =
DiffieHellman.prototype.getGenerator =
dhGetGenerator;
function dhGetGenerator(encoding) {
const generator = this[kHandle].getGenerator();
encoding = encoding || getDefaultEncoding();
return encode(generator, encoding);
}
DiffieHellmanGroup.prototype.getPublicKey =
DiffieHellman.prototype.getPublicKey =
dhGetPublicKey;
function dhGetPublicKey(encoding) {
const key = this[kHandle].getPublicKey();
encoding = encoding || getDefaultEncoding();
return encode(key, encoding);
}
DiffieHellmanGroup.prototype.getPrivateKey =
DiffieHellman.prototype.getPrivateKey =
dhGetPrivateKey;
function dhGetPrivateKey(encoding) {
const key = this[kHandle].getPrivateKey();
encoding = encoding || getDefaultEncoding();
return encode(key, encoding);
}
DiffieHellman.prototype.setPublicKey = function setPublicKey(key, encoding) {
encoding = encoding || getDefaultEncoding();
key = getArrayBufferOrView(key, 'key', encoding);
this[kHandle].setPublicKey(key);
return this;
};
DiffieHellman.prototype.setPrivateKey = function setPrivateKey(key, encoding) {
encoding = encoding || getDefaultEncoding();
key = getArrayBufferOrView(key, 'key', encoding);
this[kHandle].setPrivateKey(key);
return this;
};
function ECDH(curve) {
if (!(this instanceof ECDH))
return new ECDH(curve);
validateString(curve, 'curve');
this[kHandle] = 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[kHandle].generateKeys();
return this.getPublicKey(encoding, format);
};
ECDH.prototype.getPublicKey = function getPublicKey(encoding, format) {
const f = getFormat(format);
const key = this[kHandle].getPublicKey(f);
encoding = encoding || getDefaultEncoding();
return encode(key, encoding);
};
ECDH.convertKey = function convertKey(key, curve, inEnc, outEnc, format) {
validateString(curve, 'curve');
const encoding = inEnc || getDefaultEncoding();
key = getArrayBufferOrView(key, 'key', encoding);
outEnc = outEnc || encoding;
const f = getFormat(format);
const convertedKey = _ECDHConvertKey(key, curve, f);
return encode(convertedKey, outEnc);
};
function encode(buffer, encoding) {
if (encoding && encoding !== 'buffer')
buffer = buffer.toString(encoding);
return buffer;
}
function getFormat(format) {
if (format) {
if (format === 'compressed')
return POINT_CONVERSION_COMPRESSED;
if (format === 'hybrid')
return POINT_CONVERSION_HYBRID;
if (format !== 'uncompressed')
throw new ERR_CRYPTO_ECDH_INVALID_FORMAT(format);
}
return POINT_CONVERSION_UNCOMPRESSED;
}
const dhEnabledKeyTypes = new SafeSet(['dh', 'ec', 'x448', 'x25519']);
function diffieHellman(options) {
validateObject(options, 'options');
const { privateKey, publicKey } = options;
if (!(privateKey instanceof KeyObject))
throw new ERR_INVALID_ARG_VALUE('options.privateKey', privateKey);
if (!(publicKey instanceof KeyObject))
throw new ERR_INVALID_ARG_VALUE('options.publicKey', publicKey);
if (privateKey.type !== 'private')
throw new ERR_CRYPTO_INVALID_KEY_OBJECT_TYPE(privateKey.type, 'private');
if (publicKey.type !== 'public' && publicKey.type !== 'private') {
throw new ERR_CRYPTO_INVALID_KEY_OBJECT_TYPE(publicKey.type,
'private or public');
}
const privateType = privateKey.asymmetricKeyType;
const publicType = publicKey.asymmetricKeyType;
if (privateType !== publicType || !dhEnabledKeyTypes.has(privateType)) {
throw new ERR_CRYPTO_INCOMPATIBLE_KEY('key types for Diffie-Hellman',
`${privateType} and ${publicType}`);
}
return statelessDH(privateKey[kHandle], publicKey[kHandle]);
}
// The deriveBitsECDH function is part of the Web Crypto API and serves both
// deriveKeys and deriveBits functions.
function deriveBitsECDH(name, publicKey, privateKey, callback) {
validateString(name, 'name');
validateObject(publicKey, 'publicKey');
validateObject(privateKey, 'privateKey');
validateFunction(callback, 'callback');
const job = new ECDHBitsJob(kCryptoJobAsync, name, publicKey, privateKey);
job.ondone = (error, bits) => {
if (error) return FunctionPrototypeCall(callback, job, error);
FunctionPrototypeCall(callback, job, null, bits);
};
job.run();
}
async function asyncDeriveBitsECDH(algorithm, baseKey, length) {
const { 'public': key } = algorithm;
// Null means that we're not asking for a specific number of bits, just
// give us everything that is generated.
if (length !== null)
validateUint32(length, 'length');
if (!isCryptoKey(key))
throw new ERR_INVALID_ARG_TYPE('algorithm.public', 'CryptoKey', key);
if (key.type !== 'public') {
throw lazyDOMException(
'algorithm.public must be a public key', 'InvalidAccessError');
}
if (baseKey.type !== 'private') {
throw lazyDOMException(
'baseKey must be a private key', 'InvalidAccessError');
}
if (
key.algorithm.name !== 'ECDH' &&
key.algorithm.name !== 'X25519' &&
key.algorithm.name !== 'X448'
) {
throw lazyDOMException('Keys must be ECDH, X25519, or X448 keys', 'InvalidAccessError');
}
if (key.algorithm.name !== baseKey.algorithm.name) {
throw lazyDOMException(
'The public and private keys must be of the same type',
'InvalidAccessError');
}
if (
key.algorithm.name === 'ECDH' &&
key.algorithm.namedCurve !== baseKey.algorithm.namedCurve
) {
throw lazyDOMException('Named curve mismatch', 'InvalidAccessError');
}
const bits = await new Promise((resolve, reject) => {
deriveBitsECDH(
key.algorithm.name === 'ECDH' ? baseKey.algorithm.namedCurve : baseKey.algorithm.name,
key[kKeyObject][kHandle],
baseKey[kKeyObject][kHandle], (err, bits) => {
if (err) return reject(err);
resolve(bits);
});
});
// If a length is not specified, return the full derived secret
if (length === null)
return bits;
// If the length is not a multiple of 8 the nearest ceiled
// multiple of 8 is sliced.
length = MathCeil(length / 8);
const { byteLength } = bits;
// If the length is larger than the derived secret, throw.
// Otherwise, we either return the secret or a truncated
// slice.
if (byteLength < length)
throw lazyDOMException('derived bit length is too small', 'OperationError');
return length === byteLength ?
bits :
ArrayBufferPrototypeSlice(bits, 0, length);
}
module.exports = {
DiffieHellman,
DiffieHellmanGroup,
ECDH,
diffieHellman,
deriveBitsECDH,
asyncDeriveBitsECDH,
};
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