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// 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
];
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