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const {
ObjectSetPrototypeOf,
ReflectApply,
Symbol,
} = primordials;
const {
Hash: _Hash,
HashJob,
Hmac: _Hmac,
kCryptoJobAsync,
} = internalBinding('crypto');
const {
getArrayBufferOrView,
getDefaultEncoding,
getStringOption,
jobPromise,
normalizeAlgorithm,
normalizeHashName,
validateMaxBufferLength,
kHandle,
} = require('internal/crypto/util');
const {
prepareSecretKey,
} = require('internal/crypto/keys');
const {
lazyDOMException,
} = require('internal/util');
const {
Buffer,
} = require('buffer');
const {
codes: {
ERR_CRYPTO_HASH_FINALIZED,
ERR_CRYPTO_HASH_UPDATE_FAILED,
ERR_INVALID_ARG_TYPE,
}
} = require('internal/errors');
const {
validateEncoding,
validateString,
validateUint32,
} = require('internal/validators');
const {
isArrayBufferView,
} = require('internal/util/types');
const LazyTransform = require('internal/streams/lazy_transform');
const kState = Symbol('kState');
const kFinalized = Symbol('kFinalized');
function Hash(algorithm, options) {
if (!(this instanceof Hash))
return new Hash(algorithm, options);
if (!(algorithm instanceof _Hash))
validateString(algorithm, 'algorithm');
const xofLen = typeof options === 'object' && options !== null ?
options.outputLength : undefined;
if (xofLen !== undefined)
validateUint32(xofLen, 'options.outputLength');
this[kHandle] = new _Hash(algorithm, xofLen);
this[kState] = {
[kFinalized]: false
};
ReflectApply(LazyTransform, this, [options]);
}
ObjectSetPrototypeOf(Hash.prototype, LazyTransform.prototype);
ObjectSetPrototypeOf(Hash, LazyTransform);
Hash.prototype.copy = function copy(options) {
const state = this[kState];
if (state[kFinalized])
throw new ERR_CRYPTO_HASH_FINALIZED();
return new Hash(this[kHandle], options);
};
Hash.prototype._transform = function _transform(chunk, encoding, callback) {
this[kHandle].update(chunk, encoding);
callback();
};
Hash.prototype._flush = function _flush(callback) {
this.push(this[kHandle].digest());
callback();
};
Hash.prototype.update = function update(data, encoding) {
encoding = encoding || getDefaultEncoding();
const state = this[kState];
if (state[kFinalized])
throw new ERR_CRYPTO_HASH_FINALIZED();
if (typeof data === 'string') {
validateEncoding(data, encoding);
} else if (!isArrayBufferView(data)) {
throw new ERR_INVALID_ARG_TYPE(
'data', ['string', 'Buffer', 'TypedArray', 'DataView'], data);
}
if (!this[kHandle].update(data, encoding))
throw new ERR_CRYPTO_HASH_UPDATE_FAILED();
return this;
};
Hash.prototype.digest = function digest(outputEncoding) {
const state = this[kState];
if (state[kFinalized])
throw new ERR_CRYPTO_HASH_FINALIZED();
outputEncoding = outputEncoding || getDefaultEncoding();
// Explicit conversion for backward compatibility.
const ret = this[kHandle].digest(`${outputEncoding}`);
state[kFinalized] = true;
return ret;
};
function Hmac(hmac, key, options) {
if (!(this instanceof Hmac))
return new Hmac(hmac, key, options);
validateString(hmac, 'hmac');
const encoding = getStringOption(options, 'encoding');
key = prepareSecretKey(key, encoding);
this[kHandle] = new _Hmac();
this[kHandle].init(hmac, key);
this[kState] = {
[kFinalized]: false
};
ReflectApply(LazyTransform, this, [options]);
}
ObjectSetPrototypeOf(Hmac.prototype, LazyTransform.prototype);
ObjectSetPrototypeOf(Hmac, LazyTransform);
Hmac.prototype.update = Hash.prototype.update;
Hmac.prototype.digest = function digest(outputEncoding) {
const state = this[kState];
outputEncoding = outputEncoding || getDefaultEncoding();
if (state[kFinalized]) {
const buf = Buffer.from('');
return outputEncoding === 'buffer' ? buf : buf.toString(outputEncoding);
}
// Explicit conversion for backward compatibility.
const ret = this[kHandle].digest(`${outputEncoding}`);
state[kFinalized] = true;
return ret;
};
Hmac.prototype._flush = Hash.prototype._flush;
Hmac.prototype._transform = Hash.prototype._transform;
// Implementation for WebCrypto subtle.digest()
async function asyncDigest(algorithm, data) {
algorithm = normalizeAlgorithm(algorithm);
data = getArrayBufferOrView(data, 'data');
validateMaxBufferLength(data, 'data');
if (algorithm.length !== undefined)
validateUint32(algorithm.length, 'algorithm.length');
switch (algorithm.name) {
case 'SHA-1':
// Fall through
case 'SHA-256':
// Fall through
case 'SHA-384':
// Fall through
case 'SHA-512':
return jobPromise(new HashJob(
kCryptoJobAsync,
normalizeHashName(algorithm.name),
data,
algorithm.length));
}
throw lazyDOMException('Unrecognized name.', 'NotSupportedError');
}
module.exports = {
Hash,
Hmac,
asyncDigest,
};
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