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'use strict';
const {
Hash: _Hash,
Hmac: _Hmac
} = process.binding('crypto');
const {
getDefaultEncoding,
toBuf
} = require('internal/crypto/util');
const { Buffer } = require('buffer');
const {
ERR_CRYPTO_HASH_DIGEST_NO_UTF16,
ERR_CRYPTO_HASH_FINALIZED,
ERR_CRYPTO_HASH_UPDATE_FAILED,
ERR_INVALID_ARG_TYPE
} = require('internal/errors').codes;
const { inherits } = require('util');
const { normalizeEncoding } = require('internal/util');
const { isArrayBufferView } = require('internal/util/types');
const LazyTransform = require('internal/streams/lazy_transform');
const kState = Symbol('state');
const kFinalized = Symbol('finalized');
function Hash(algorithm, options) {
if (!(this instanceof Hash))
return new Hash(algorithm, options);
if (typeof algorithm !== 'string')
throw new ERR_INVALID_ARG_TYPE('algorithm', 'string', algorithm);
this._handle = new _Hash(algorithm);
this[kState] = {
[kFinalized]: false
};
LazyTransform.call(this, options);
}
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) {
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', 'TypedArray', 'DataView'], data);
}
if (!this._handle.update(data, encoding || getDefaultEncoding()))
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();
if (normalizeEncoding(outputEncoding) === 'utf16le')
throw new ERR_CRYPTO_HASH_DIGEST_NO_UTF16();
// Explicit conversion for backward compatibility.
const ret = this._handle.digest(`${outputEncoding}`);
state[kFinalized] = true;
return ret;
};
function Hmac(hmac, key, options) {
if (!(this instanceof Hmac))
return new Hmac(hmac, key, options);
if (typeof hmac !== 'string')
throw new ERR_INVALID_ARG_TYPE('hmac', 'string', hmac);
if (typeof key !== 'string' && !isArrayBufferView(key)) {
throw new ERR_INVALID_ARG_TYPE('key',
['string', 'TypedArray', 'DataView'], key);
}
this._handle = new _Hmac();
this._handle.init(hmac, toBuf(key));
this[kState] = {
[kFinalized]: false
};
LazyTransform.call(this, options);
}
inherits(Hmac, LazyTransform);
Hmac.prototype.update = Hash.prototype.update;
Hmac.prototype.digest = function digest(outputEncoding) {
const state = this[kState];
outputEncoding = outputEncoding || getDefaultEncoding();
if (normalizeEncoding(outputEncoding) === 'utf16le')
throw new ERR_CRYPTO_HASH_DIGEST_NO_UTF16();
if (state[kFinalized]) {
const buf = Buffer.from('');
return outputEncoding === 'buffer' ? buf : buf.toString(outputEncoding);
}
// Explicit conversion for backward compatibility.
const ret = this._handle.digest(`${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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