| // 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 |
| ]; |