Andreas Hocevar
66 lines
1.9 KiB
JavaScript
66 lines
1.9 KiB
JavaScript
// Copyright 2014 The Closure Library Authors. All Rights Reserved.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS-IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
/**
|
|
* @fileoverview SHA-512/256 cryptographic hash.
|
|
*
|
|
* WARNING: SHA-256 and SHA-512/256 are different members of the SHA-2
|
|
* family of hashes. Although both give 32-byte results, the two results
|
|
* should bear no relationship to each other.
|
|
*
|
|
* Please be careful before using this hash function.
|
|
* <p>
|
|
* Usage:
|
|
* var sha512_256 = new goog.crypt.Sha512_256();
|
|
* sha512_256.update(bytes);
|
|
* var hash = sha512_256.digest();
|
|
*
|
|
* @author fy@google.com (Frank Yellin)
|
|
*/
|
|
|
|
goog.provide('goog.crypt.Sha512_256');
|
|
|
|
goog.require('goog.crypt.Sha2_64bit');
|
|
|
|
|
|
|
|
/**
|
|
* Constructs a SHA-512/256 cryptographic hash.
|
|
*
|
|
* @constructor
|
|
* @extends {goog.crypt.Sha2_64bit}
|
|
* @final
|
|
* @struct
|
|
*/
|
|
goog.crypt.Sha512_256 = function() {
|
|
goog.crypt.Sha512_256.base(this, 'constructor', 4 /* numHashBlocks */,
|
|
goog.crypt.Sha512_256.INIT_HASH_BLOCK_);
|
|
};
|
|
goog.inherits(goog.crypt.Sha512_256, goog.crypt.Sha2_64bit);
|
|
|
|
|
|
/** @private {!Array<number>} */
|
|
goog.crypt.Sha512_256.INIT_HASH_BLOCK_ = [
|
|
// Section 5.3.6.2 of
|
|
// csrc.nist.gov/publications/fips/fips180-4/fips-180-4.pdf
|
|
0x22312194, 0xFC2BF72C, // H0
|
|
0x9F555FA3, 0xC84C64C2, // H1
|
|
0x2393B86B, 0x6F53B151, // H2
|
|
0x96387719, 0x5940EABD, // H3
|
|
0x96283EE2, 0xA88EFFE3, // H4
|
|
0xBE5E1E25, 0x53863992, // H5
|
|
0x2B0199FC, 0x2C85B8AA, // H6
|
|
0x0EB72DDC, 0x81C52CA2 // H7
|
|
];
|