| /* |
| Licensed to the Apache Software Foundation (ASF) under one |
| or more contributor license agreements. See the NOTICE file |
| distributed with this work for additional information |
| regarding copyright ownership. The ASF licenses this file |
| to you 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. |
| */ |
| |
| var HASH256 = function() { |
| "use strict"; |
| |
| /** |
| * Creates an instance of HASH256 |
| * |
| * @constructor |
| * @this {HASH256} |
| */ |
| var HASH256 = function() { |
| this.length = []; |
| this.h = []; |
| this.w = []; |
| this.init(); |
| }; |
| |
| HASH256.prototype = { |
| |
| transform: function() { /* basic transformation step */ |
| var a, b, c, d, e, f, g, hh, t1, t2, j; |
| |
| for (j = 16; j < 64; j++) { |
| this.w[j] = (HASH256.theta1(this.w[j - 2]) + this.w[j - 7] + HASH256.theta0(this.w[j - 15]) + this.w[j - 16]) | 0; |
| } |
| |
| a = this.h[0]; |
| b = this.h[1]; |
| c = this.h[2]; |
| d = this.h[3]; |
| e = this.h[4]; |
| f = this.h[5]; |
| g = this.h[6]; |
| hh = this.h[7]; |
| |
| for (j = 0; j < 64; j++) { /* 64 times - mush it up */ |
| t1 = (hh + HASH256.Sig1(e) + HASH256.Ch(e, f, g) + HASH256.HK[j] + this.w[j]) | 0; |
| t2 = (HASH256.Sig0(a) + HASH256.Maj(a, b, c)) | 0; |
| hh = g; |
| g = f; |
| f = e; |
| e = (d + t1) | 0; // Need to knock these back down to prevent 52-bit overflow |
| d = c; |
| c = b; |
| b = a; |
| a = (t1 + t2) | 0; |
| |
| } |
| this.h[0] += a; |
| this.h[1] += b; |
| this.h[2] += c; |
| this.h[3] += d; |
| this.h[4] += e; |
| this.h[5] += f; |
| this.h[6] += g; |
| this.h[7] += hh; |
| |
| }, |
| |
| /** |
| * Initialise Hash function |
| * |
| * @this {HASH256} |
| */ |
| init: function() { /* initialise */ |
| var i; |
| |
| for (i = 0; i < 64; i++) { |
| this.w[i] = 0; |
| } |
| this.length[0] = this.length[1] = 0; |
| this.h[0] = HASH256.H[0]; |
| this.h[1] = HASH256.H[1]; |
| this.h[2] = HASH256.H[2]; |
| this.h[3] = HASH256.H[3]; |
| this.h[4] = HASH256.H[4]; |
| this.h[5] = HASH256.H[5]; |
| this.h[6] = HASH256.H[6]; |
| this.h[7] = HASH256.H[7]; |
| }, |
| |
| /** |
| * Process a single byte |
| * |
| * @this {HASH256} |
| * @param byt byte to be included in hash |
| */ |
| process: function(byt) { /* process the next message byte */ |
| var cnt; |
| |
| cnt = (this.length[0] >>> 5) % 16; |
| this.w[cnt] <<= 8; |
| this.w[cnt] |= (byt & 0xFF); |
| this.length[0] += 8; |
| |
| if ((this.length[0] & 0xffffffff) === 0) { |
| this.length[1]++; |
| this.length[0] = 0; |
| } |
| |
| if ((this.length[0] % 512) === 0) { |
| this.transform(); |
| } |
| }, |
| |
| /** |
| * Process an array of bytes |
| * |
| * @this {HASH256} |
| * @param b byte arrray to be included in hash |
| */ |
| process_array: function(b) { |
| for (var i = 0; i < b.length; i++) { |
| this.process(b[i]); |
| } |
| }, |
| |
| /** |
| * Process a 32-bit integer |
| * |
| * @this {HASH256} |
| * @param n Integer to be included in hash |
| */ |
| process_num: function(n) { |
| this.process((n >> 24) & 0xff); |
| this.process((n >> 16) & 0xff); |
| this.process((n >> 8) & 0xff); |
| this.process(n & 0xff); |
| }, |
| |
| /** |
| * Generate 32-byte hash |
| * |
| * @this {HASH256} |
| * @return digest 32-byte hash |
| */ |
| hash: function() { /* pad message and finish - supply digest */ |
| var digest = [], |
| len0, len1, i; |
| |
| len0 = this.length[0]; |
| len1 = this.length[1]; |
| this.process(0x80); |
| |
| while ((this.length[0] % 512) != 448) { |
| this.process(0); |
| } |
| |
| this.w[14] = len1; |
| this.w[15] = len0; |
| this.transform(); |
| |
| for (i = 0; i < HASH256.len; i++) { /* convert to bytes */ |
| digest[i] = ((this.h[i >>> 2] >> (8 * (3 - i % 4))) & 0xff); |
| } |
| this.init(); |
| |
| return digest; |
| } |
| }; |
| |
| /* static functions */ |
| |
| HASH256.S = function(n, x) { |
| return (((x) >>> n) | ((x) << (32 - n))); |
| }; |
| |
| HASH256.R = function(n, x) { |
| return ((x) >>> n); |
| }; |
| |
| HASH256.Ch = function(x, y, z) { |
| return ((x & y) ^ (~(x) & z)); |
| }; |
| |
| HASH256.Maj = function(x, y, z) { |
| return ((x & y) ^ (x & z) ^ (y & z)); |
| }; |
| |
| HASH256.Sig0 = function(x) { |
| return (HASH256.S(2, x) ^ HASH256.S(13, x) ^ HASH256.S(22, x)); |
| }; |
| |
| HASH256.Sig1 = function(x) { |
| return (HASH256.S(6, x) ^ HASH256.S(11, x) ^ HASH256.S(25, x)); |
| }; |
| |
| HASH256.theta0 = function(x) { |
| return (HASH256.S(7, x) ^ HASH256.S(18, x) ^ HASH256.R(3, x)); |
| }; |
| |
| HASH256.theta1 = function(x) { |
| return (HASH256.S(17, x) ^ HASH256.S(19, x) ^ HASH256.R(10, x)); |
| }; |
| |
| /* constants */ |
| HASH256.len = 32; |
| |
| HASH256.H = [0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19]; |
| |
| HASH256.HK = [0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, |
| 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, |
| 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, |
| 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, |
| 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, |
| 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, |
| 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, |
| 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 |
| ]; |
| |
| return HASH256; |
| }; |
| |
| if (typeof module !== "undefined" && typeof module.exports !== "undefined") { |
| module.exports = { |
| HASH256: HASH256 |
| }; |
| } |