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'use strict';
const {
ObjectSetPrototypeOf,
} = primordials;
const {
Hash: _Hash,
Hmac: _Hmac
} = internalBinding('crypto');
const {
getDefaultEncoding,
kHandle,
toBuf
} = require('internal/crypto/util');
const {
prepareSecretKey
} = require('internal/crypto/keys');
const { Buffer } = require('buffer');
const {
ERR_CRYPTO_HASH_FINALIZED,
ERR_CRYPTO_HASH_UPDATE_FAILED,
ERR_INVALID_ARG_TYPE
} = require('internal/errors').codes;
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
};
LazyTransform.call(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' && !isArrayBufferView(data)) {
throw new ERR_INVALID_ARG_TYPE('data',
['string',
'Buffer',
'TypedArray',
'DataView'],
data);
}
validateEncoding(data, encoding);
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(`${outputEncoding}`);
state[kFinalized] = true;
return ret;
};
function Hmac(hmac, key, options) {
if (!(this instanceof Hmac))
return new Hmac(hmac, key, options);
validateString(hmac, 'hmac');
key = prepareSecretKey(key);
this[kHandle] = new _Hmac();
this[kHandle].init(hmac, toBuf(key));
this[kState] = {
[kFinalized]: false
};
LazyTransform.call(this, options);
}
ObjectSetPrototypeOf(Hmac.prototype, LazyTransform.prototype);
ObjectSetPrototypeOf(Hmac, LazyTransform);
Hmac.prototype.update = Hash.prototype.update;
Hmac.prototype.digest = function digest(outputEncoding) {
const state = this[kState];
outputEncoding = outputEncoding || getDefaultEncoding();
if (state[kFinalized]) {
const buf = Buffer.from('');
return outputEncoding === 'buffer' ? buf : buf.toString(outputEncoding);
}
// Explicit conversion for backward compatibility.
const ret = this[kHandle].digest(`${outputEncoding}`);
state[kFinalized] = true;
return ret;
};
Hmac.prototype._flush = Hash.prototype._flush;
Hmac.prototype._transform = Hash.prototype._transform;
module.exports = {
Hash,
Hmac
};
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