public/sha256.js

   1 /**
   2  * [js-sha256]{@link https://github.com/emn178/js-sha256}
   3  *
   4  * @version 0.9.0
   5  * @author Chen, Yi-Cyuan [emn178@gmail.com]
   6  * @copyright Chen, Yi-Cyuan 2014-2017
   7  * @license MIT
   8  */
   9 /*jslint bitwise: true */
  10 (function () {
  11   'use strict';
  12
  13   var ERROR = 'input is invalid type';
  14   var WINDOW = typeof window === 'object';
  15   var root = WINDOW ? window : {};
  16   if (root.JS_SHA256_NO_WINDOW) {
  17     WINDOW = false;
  18   }
  19   var WEB_WORKER = !WINDOW && typeof self === 'object';
  20   var NODE_JS = !root.JS_SHA256_NO_NODE_JS && typeof process === 'object' && process.versions && process.versions.node;
  21   if (NODE_JS) {
  22     root = global;
  23   } else if (WEB_WORKER) {
  24     root = self;
  25   }
  26   var COMMON_JS = !root.JS_SHA256_NO_COMMON_JS && typeof module === 'object' && module.exports;
  27   var AMD = typeof define === 'function' && define.amd;
  28   var ARRAY_BUFFER = !root.JS_SHA256_NO_ARRAY_BUFFER && typeof ArrayBuffer !== 'undefined';
  29   var HEX_CHARS = '0123456789abcdef'.split('');
  30   var EXTRA = [-2147483648, 8388608, 32768, 128];
  31   var SHIFT = [24, 16, 8, 0];
  32   var K = [
  33     0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
  34     0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
  35     0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
  36     0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
  37     0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
  38     0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
  39     0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
  40     0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
  41   ];
  42   var OUTPUT_TYPES = ['hex', 'array', 'digest', 'arrayBuffer'];
  43
  44   var blocks = [];
  45
  46   if (root.JS_SHA256_NO_NODE_JS || !Array.isArray) {
  47     Array.isArray = function (obj) {
  48       return Object.prototype.toString.call(obj) === '[object Array]';
  49     };
  50   }
  51
  52   if (ARRAY_BUFFER && (root.JS_SHA256_NO_ARRAY_BUFFER_IS_VIEW || !ArrayBuffer.isView)) {
  53     ArrayBuffer.isView = function (obj) {
  54       return typeof obj === 'object' && obj.buffer && obj.buffer.constructor === ArrayBuffer;
  55     };
  56   }
  57
  58   var createOutputMethod = function (outputType, is224) {
  59     return function (message) {
  60       return new Sha256(is224, true).update(message)[outputType]();
  61     };
  62   };
  63
  64   var createMethod = function (is224) {
  65     var method = createOutputMethod('hex', is224);
  66     if (NODE_JS) {
  67       method = nodeWrap(method, is224);
  68     }
  69     method.create = function () {
  70       return new Sha256(is224);
  71     };
  72     method.update = function (message) {
  73       return method.create().update(message);
  74     };
  75     for (var i = 0; i < OUTPUT_TYPES.length; ++i) {
  76       var type = OUTPUT_TYPES[i];
  77       method[type] = createOutputMethod(type, is224);
  78     }
  79     return method;
  80   };
  81
  82   var nodeWrap = function (method, is224) {
  83     var crypto = eval("require('crypto')");
  84     var Buffer = eval("require('buffer').Buffer");
  85     var algorithm = is224 ? 'sha224' : 'sha256';
  86     var nodeMethod = function (message) {
  87       if (typeof message === 'string') {
  88         return crypto.createHash(algorithm).update(message, 'utf8').digest('hex');
  89       } else {
  90         if (message === null || message === undefined) {
  91           throw new Error(ERROR);
  92         } else if (message.constructor === ArrayBuffer) {
  93           message = new Uint8Array(message);
  94         }
  95       }
  96       if (Array.isArray(message) || ArrayBuffer.isView(message) ||
  97         message.constructor === Buffer) {
  98         return crypto.createHash(algorithm).update(new Buffer(message)).digest('hex');
  99       } else {
 100         return method(message);
 101       }
 102     };
 103     return nodeMethod;
 104   };
 105
 106   var createHmacOutputMethod = function (outputType, is224) {
 107     return function (key, message) {
 108       return new HmacSha256(key, is224, true).update(message)[outputType]();
 109     };
 110   };
 111
 112   var createHmacMethod = function (is224) {
 113     var method = createHmacOutputMethod('hex', is224);
 114     method.create = function (key) {
 115       return new HmacSha256(key, is224);
 116     };
 117     method.update = function (key, message) {
 118       return method.create(key).update(message);
 119     };
 120     for (var i = 0; i < OUTPUT_TYPES.length; ++i) {
 121       var type = OUTPUT_TYPES[i];
 122       method[type] = createHmacOutputMethod(type, is224);
 123     }
 124     return method;
 125   };
 126
 127   function Sha256(is224, sharedMemory) {
 128     if (sharedMemory) {
 129       blocks[0] = blocks[16] = blocks[1] = blocks[2] = blocks[3] =
 130         blocks[4] = blocks[5] = blocks[6] = blocks[7] =
 131         blocks[8] = blocks[9] = blocks[10] = blocks[11] =
 132         blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
 133       this.blocks = blocks;
 134     } else {
 135       this.blocks = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
 136     }
 137
 138     if (is224) {
 139       this.h0 = 0xc1059ed8;
 140       this.h1 = 0x367cd507;
 141       this.h2 = 0x3070dd17;
 142       this.h3 = 0xf70e5939;
 143       this.h4 = 0xffc00b31;
 144       this.h5 = 0x68581511;
 145       this.h6 = 0x64f98fa7;
 146       this.h7 = 0xbefa4fa4;
 147     } else { // 256
 148       this.h0 = 0x6a09e667;
 149       this.h1 = 0xbb67ae85;
 150       this.h2 = 0x3c6ef372;
 151       this.h3 = 0xa54ff53a;
 152       this.h4 = 0x510e527f;
 153       this.h5 = 0x9b05688c;
 154       this.h6 = 0x1f83d9ab;
 155       this.h7 = 0x5be0cd19;
 156     }
 157
 158     this.block = this.start = this.bytes = this.hBytes = 0;
 159     this.finalized = this.hashed = false;
 160     this.first = true;
 161     this.is224 = is224;
 162   }
 163
 164   Sha256.prototype.update = function (message) {
 165     if (this.finalized) {
 166       return;
 167     }
 168     var notString, type = typeof message;
 169     if (type !== 'string') {
 170       if (type === 'object') {
 171         if (message === null) {
 172           throw new Error(ERROR);
 173         } else if (ARRAY_BUFFER && message.constructor === ArrayBuffer) {
 174           message = new Uint8Array(message);
 175         } else if (!Array.isArray(message)) {
 176           if (!ARRAY_BUFFER || !ArrayBuffer.isView(message)) {
 177             throw new Error(ERROR);
 178           }
 179         }
 180       } else {
 181         throw new Error(ERROR);
 182       }
 183       notString = true;
 184     }
 185     var code, index = 0, i, length = message.length, blocks = this.blocks;
 186
 187     while (index < length) {
 188       if (this.hashed) {
 189         this.hashed = false;
 190         blocks[0] = this.block;
 191         blocks[16] = blocks[1] = blocks[2] = blocks[3] =
 192           blocks[4] = blocks[5] = blocks[6] = blocks[7] =
 193           blocks[8] = blocks[9] = blocks[10] = blocks[11] =
 194           blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
 195       }
 196
 197       if (notString) {
 198         for (i = this.start; index < length && i < 64; ++index) {
 199           blocks[i >> 2] |= message[index] << SHIFT[i++ & 3];
 200         }
 201       } else {
 202         for (i = this.start; index < length && i < 64; ++index) {
 203           code = message.charCodeAt(index);
 204           if (code < 0x80) {
 205             blocks[i >> 2] |= code << SHIFT[i++ & 3];
 206           } else if (code < 0x800) {
 207             blocks[i >> 2] |= (0xc0 | (code >> 6)) << SHIFT[i++ & 3];
 208             blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
 209           } else if (code < 0xd800 || code >= 0xe000) {
 210             blocks[i >> 2] |= (0xe0 | (code >> 12)) << SHIFT[i++ & 3];
 211             blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
 212             blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
 213           } else {
 214             code = 0x10000 + (((code & 0x3ff) << 10) | (message.charCodeAt(++index) & 0x3ff));
 215             blocks[i >> 2] |= (0xf0 | (code >> 18)) << SHIFT[i++ & 3];
 216             blocks[i >> 2] |= (0x80 | ((code >> 12) & 0x3f)) << SHIFT[i++ & 3];
 217             blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
 218             blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
 219           }
 220         }
 221       }
 222
 223       this.lastByteIndex = i;
 224       this.bytes += i - this.start;
 225       if (i >= 64) {
 226         this.block = blocks[16];
 227         this.start = i - 64;
 228         this.hash();
 229         this.hashed = true;
 230       } else {
 231         this.start = i;
 232       }
 233     }
 234     if (this.bytes > 4294967295) {
 235       this.hBytes += this.bytes / 4294967296 << 0;
 236       this.bytes = this.bytes % 4294967296;
 237     }
 238     return this;
 239   };
 240
 241   Sha256.prototype.finalize = function () {
 242     if (this.finalized) {
 243       return;
 244     }
 245     this.finalized = true;
 246     var blocks = this.blocks, i = this.lastByteIndex;
 247     blocks[16] = this.block;
 248     blocks[i >> 2] |= EXTRA[i & 3];
 249     this.block = blocks[16];
 250     if (i >= 56) {
 251       if (!this.hashed) {
 252         this.hash();
 253       }
 254       blocks[0] = this.block;
 255       blocks[16] = blocks[1] = blocks[2] = blocks[3] =
 256         blocks[4] = blocks[5] = blocks[6] = blocks[7] =
 257         blocks[8] = blocks[9] = blocks[10] = blocks[11] =
 258         blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
 259     }
 260     blocks[14] = this.hBytes << 3 | this.bytes >>> 29;
 261     blocks[15] = this.bytes << 3;
 262     this.hash();
 263   };
 264
 265   Sha256.prototype.hash = function () {
 266     var a = this.h0, b = this.h1, c = this.h2, d = this.h3, e = this.h4, f = this.h5, g = this.h6,
 267       h = this.h7, blocks = this.blocks, j, s0, s1, maj, t1, t2, ch, ab, da, cd, bc;
 268
 269     for (j = 16; j < 64; ++j) {
 270       // rightrotate
 271       t1 = blocks[j - 15];
 272       s0 = ((t1 >>> 7) | (t1 << 25)) ^ ((t1 >>> 18) | (t1 << 14)) ^ (t1 >>> 3);
 273       t1 = blocks[j - 2];
 274       s1 = ((t1 >>> 17) | (t1 << 15)) ^ ((t1 >>> 19) | (t1 << 13)) ^ (t1 >>> 10);
 275       blocks[j] = blocks[j - 16] + s0 + blocks[j - 7] + s1 << 0;
 276     }
 277
 278     bc = b & c;
 279     for (j = 0; j < 64; j += 4) {
 280       if (this.first) {
 281         if (this.is224) {
 282           ab = 300032;
 283           t1 = blocks[0] - 1413257819;
 284           h = t1 - 150054599 << 0;
 285           d = t1 + 24177077 << 0;
 286         } else {
 287           ab = 704751109;
 288           t1 = blocks[0] - 210244248;
 289           h = t1 - 1521486534 << 0;
 290           d = t1 + 143694565 << 0;
 291         }
 292         this.first = false;
 293       } else {
 294         s0 = ((a >>> 2) | (a << 30)) ^ ((a >>> 13) | (a << 19)) ^ ((a >>> 22) | (a << 10));
 295         s1 = ((e >>> 6) | (e << 26)) ^ ((e >>> 11) | (e << 21)) ^ ((e >>> 25) | (e << 7));
 296         ab = a & b;
 297         maj = ab ^ (a & c) ^ bc;
 298         ch = (e & f) ^ (~e & g);
 299         t1 = h + s1 + ch + K[j] + blocks[j];
 300         t2 = s0 + maj;
 301         h = d + t1 << 0;
 302         d = t1 + t2 << 0;
 303       }
 304       s0 = ((d >>> 2) | (d << 30)) ^ ((d >>> 13) | (d << 19)) ^ ((d >>> 22) | (d << 10));
 305       s1 = ((h >>> 6) | (h << 26)) ^ ((h >>> 11) | (h << 21)) ^ ((h >>> 25) | (h << 7));
 306       da = d & a;
 307       maj = da ^ (d & b) ^ ab;
 308       ch = (h & e) ^ (~h & f);
 309       t1 = g + s1 + ch + K[j + 1] + blocks[j + 1];
 310       t2 = s0 + maj;
 311       g = c + t1 << 0;
 312       c = t1 + t2 << 0;
 313       s0 = ((c >>> 2) | (c << 30)) ^ ((c >>> 13) | (c << 19)) ^ ((c >>> 22) | (c << 10));
 314       s1 = ((g >>> 6) | (g << 26)) ^ ((g >>> 11) | (g << 21)) ^ ((g >>> 25) | (g << 7));
 315       cd = c & d;
 316       maj = cd ^ (c & a) ^ da;
 317       ch = (g & h) ^ (~g & e);
 318       t1 = f + s1 + ch + K[j + 2] + blocks[j + 2];
 319       t2 = s0 + maj;
 320       f = b + t1 << 0;
 321       b = t1 + t2 << 0;
 322       s0 = ((b >>> 2) | (b << 30)) ^ ((b >>> 13) | (b << 19)) ^ ((b >>> 22) | (b << 10));
 323       s1 = ((f >>> 6) | (f << 26)) ^ ((f >>> 11) | (f << 21)) ^ ((f >>> 25) | (f << 7));
 324       bc = b & c;
 325       maj = bc ^ (b & d) ^ cd;
 326       ch = (f & g) ^ (~f & h);
 327       t1 = e + s1 + ch + K[j + 3] + blocks[j + 3];
 328       t2 = s0 + maj;
 329       e = a + t1 << 0;
 330       a = t1 + t2 << 0;
 331     }
 332
 333     this.h0 = this.h0 + a << 0;
 334     this.h1 = this.h1 + b << 0;
 335     this.h2 = this.h2 + c << 0;
 336     this.h3 = this.h3 + d << 0;
 337     this.h4 = this.h4 + e << 0;
 338     this.h5 = this.h5 + f << 0;
 339     this.h6 = this.h6 + g << 0;
 340     this.h7 = this.h7 + h << 0;
 341   };
 342
 343   Sha256.prototype.hex = function () {
 344     this.finalize();
 345
 346     var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3, h4 = this.h4, h5 = this.h5,
 347       h6 = this.h6, h7 = this.h7;
 348
 349     var hex = HEX_CHARS[(h0 >> 28) & 0x0F] + HEX_CHARS[(h0 >> 24) & 0x0F] +
 350       HEX_CHARS[(h0 >> 20) & 0x0F] + HEX_CHARS[(h0 >> 16) & 0x0F] +
 351       HEX_CHARS[(h0 >> 12) & 0x0F] + HEX_CHARS[(h0 >> 8) & 0x0F] +
 352       HEX_CHARS[(h0 >> 4) & 0x0F] + HEX_CHARS[h0 & 0x0F] +
 353       HEX_CHARS[(h1 >> 28) & 0x0F] + HEX_CHARS[(h1 >> 24) & 0x0F] +
 354       HEX_CHARS[(h1 >> 20) & 0x0F] + HEX_CHARS[(h1 >> 16) & 0x0F] +
 355       HEX_CHARS[(h1 >> 12) & 0x0F] + HEX_CHARS[(h1 >> 8) & 0x0F] +
 356       HEX_CHARS[(h1 >> 4) & 0x0F] + HEX_CHARS[h1 & 0x0F] +
 357       HEX_CHARS[(h2 >> 28) & 0x0F] + HEX_CHARS[(h2 >> 24) & 0x0F] +
 358       HEX_CHARS[(h2 >> 20) & 0x0F] + HEX_CHARS[(h2 >> 16) & 0x0F] +
 359       HEX_CHARS[(h2 >> 12) & 0x0F] + HEX_CHARS[(h2 >> 8) & 0x0F] +
 360       HEX_CHARS[(h2 >> 4) & 0x0F] + HEX_CHARS[h2 & 0x0F] +
 361       HEX_CHARS[(h3 >> 28) & 0x0F] + HEX_CHARS[(h3 >> 24) & 0x0F] +
 362       HEX_CHARS[(h3 >> 20) & 0x0F] + HEX_CHARS[(h3 >> 16) & 0x0F] +
 363       HEX_CHARS[(h3 >> 12) & 0x0F] + HEX_CHARS[(h3 >> 8) & 0x0F] +
 364       HEX_CHARS[(h3 >> 4) & 0x0F] + HEX_CHARS[h3 & 0x0F] +
 365       HEX_CHARS[(h4 >> 28) & 0x0F] + HEX_CHARS[(h4 >> 24) & 0x0F] +
 366       HEX_CHARS[(h4 >> 20) & 0x0F] + HEX_CHARS[(h4 >> 16) & 0x0F] +
 367       HEX_CHARS[(h4 >> 12) & 0x0F] + HEX_CHARS[(h4 >> 8) & 0x0F] +
 368       HEX_CHARS[(h4 >> 4) & 0x0F] + HEX_CHARS[h4 & 0x0F] +
 369       HEX_CHARS[(h5 >> 28) & 0x0F] + HEX_CHARS[(h5 >> 24) & 0x0F] +
 370       HEX_CHARS[(h5 >> 20) & 0x0F] + HEX_CHARS[(h5 >> 16) & 0x0F] +
 371       HEX_CHARS[(h5 >> 12) & 0x0F] + HEX_CHARS[(h5 >> 8) & 0x0F] +
 372       HEX_CHARS[(h5 >> 4) & 0x0F] + HEX_CHARS[h5 & 0x0F] +
 373       HEX_CHARS[(h6 >> 28) & 0x0F] + HEX_CHARS[(h6 >> 24) & 0x0F] +
 374       HEX_CHARS[(h6 >> 20) & 0x0F] + HEX_CHARS[(h6 >> 16) & 0x0F] +
 375       HEX_CHARS[(h6 >> 12) & 0x0F] + HEX_CHARS[(h6 >> 8) & 0x0F] +
 376       HEX_CHARS[(h6 >> 4) & 0x0F] + HEX_CHARS[h6 & 0x0F];
 377     if (!this.is224) {
 378       hex += HEX_CHARS[(h7 >> 28) & 0x0F] + HEX_CHARS[(h7 >> 24) & 0x0F] +
 379         HEX_CHARS[(h7 >> 20) & 0x0F] + HEX_CHARS[(h7 >> 16) & 0x0F] +
 380         HEX_CHARS[(h7 >> 12) & 0x0F] + HEX_CHARS[(h7 >> 8) & 0x0F] +
 381         HEX_CHARS[(h7 >> 4) & 0x0F] + HEX_CHARS[h7 & 0x0F];
 382     }
 383     return hex;
 384   };
 385
 386   Sha256.prototype.toString = Sha256.prototype.hex;
 387
 388   Sha256.prototype.digest = function () {
 389     this.finalize();
 390
 391     var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3, h4 = this.h4, h5 = this.h5,
 392       h6 = this.h6, h7 = this.h7;
 393
 394     var arr = [
 395       (h0 >> 24) & 0xFF, (h0 >> 16) & 0xFF, (h0 >> 8) & 0xFF, h0 & 0xFF,
 396       (h1 >> 24) & 0xFF, (h1 >> 16) & 0xFF, (h1 >> 8) & 0xFF, h1 & 0xFF,
 397       (h2 >> 24) & 0xFF, (h2 >> 16) & 0xFF, (h2 >> 8) & 0xFF, h2 & 0xFF,
 398       (h3 >> 24) & 0xFF, (h3 >> 16) & 0xFF, (h3 >> 8) & 0xFF, h3 & 0xFF,
 399       (h4 >> 24) & 0xFF, (h4 >> 16) & 0xFF, (h4 >> 8) & 0xFF, h4 & 0xFF,
 400       (h5 >> 24) & 0xFF, (h5 >> 16) & 0xFF, (h5 >> 8) & 0xFF, h5 & 0xFF,
 401       (h6 >> 24) & 0xFF, (h6 >> 16) & 0xFF, (h6 >> 8) & 0xFF, h6 & 0xFF
 402     ];
 403     if (!this.is224) {
 404       arr.push((h7 >> 24) & 0xFF, (h7 >> 16) & 0xFF, (h7 >> 8) & 0xFF, h7 & 0xFF);
 405     }
 406     return arr;
 407   };
 408
 409   Sha256.prototype.array = Sha256.prototype.digest;
 410
 411   Sha256.prototype.arrayBuffer = function () {
 412     this.finalize();
 413
 414     var buffer = new ArrayBuffer(this.is224 ? 28 : 32);
 415     var dataView = new DataView(buffer);
 416     dataView.setUint32(0, this.h0);
 417     dataView.setUint32(4, this.h1);
 418     dataView.setUint32(8, this.h2);
 419     dataView.setUint32(12, this.h3);
 420     dataView.setUint32(16, this.h4);
 421     dataView.setUint32(20, this.h5);
 422     dataView.setUint32(24, this.h6);
 423     if (!this.is224) {
 424       dataView.setUint32(28, this.h7);
 425     }
 426     return buffer;
 427   };
 428
 429   function HmacSha256(key, is224, sharedMemory) {
 430     var i, type = typeof key;
 431     if (type === 'string') {
 432       var bytes = [], length = key.length, index = 0, code;
 433       for (i = 0; i < length; ++i) {
 434         code = key.charCodeAt(i);
 435         if (code < 0x80) {
 436           bytes[index++] = code;
 437         } else if (code < 0x800) {
 438           bytes[index++] = (0xc0 | (code >> 6));
 439           bytes[index++] = (0x80 | (code & 0x3f));
 440         } else if (code < 0xd800 || code >= 0xe000) {
 441           bytes[index++] = (0xe0 | (code >> 12));
 442           bytes[index++] = (0x80 | ((code >> 6) & 0x3f));
 443           bytes[index++] = (0x80 | (code & 0x3f));
 444         } else {
 445           code = 0x10000 + (((code & 0x3ff) << 10) | (key.charCodeAt(++i) & 0x3ff));
 446           bytes[index++] = (0xf0 | (code >> 18));
 447           bytes[index++] = (0x80 | ((code >> 12) & 0x3f));
 448           bytes[index++] = (0x80 | ((code >> 6) & 0x3f));
 449           bytes[index++] = (0x80 | (code & 0x3f));
 450         }
 451       }
 452       key = bytes;
 453     } else {
 454       if (type === 'object') {
 455         if (key === null) {
 456           throw new Error(ERROR);
 457         } else if (ARRAY_BUFFER && key.constructor === ArrayBuffer) {
 458           key = new Uint8Array(key);
 459         } else if (!Array.isArray(key)) {
 460           if (!ARRAY_BUFFER || !ArrayBuffer.isView(key)) {
 461             throw new Error(ERROR);
 462           }
 463         }
 464       } else {
 465         throw new Error(ERROR);
 466       }
 467     }
 468
 469     if (key.length > 64) {
 470       key = (new Sha256(is224, true)).update(key).array();
 471     }
 472
 473     var oKeyPad = [], iKeyPad = [];
 474     for (i = 0; i < 64; ++i) {
 475       var b = key[i] || 0;
 476       oKeyPad[i] = 0x5c ^ b;
 477       iKeyPad[i] = 0x36 ^ b;
 478     }
 479
 480     Sha256.call(this, is224, sharedMemory);
 481
 482     this.update(iKeyPad);
 483     this.oKeyPad = oKeyPad;
 484     this.inner = true;
 485     this.sharedMemory = sharedMemory;
 486   }
 487   HmacSha256.prototype = new Sha256();
 488
 489   HmacSha256.prototype.finalize = function () {
 490     Sha256.prototype.finalize.call(this);
 491     if (this.inner) {
 492       this.inner = false;
 493       var innerHash = this.array();
 494       Sha256.call(this, this.is224, this.sharedMemory);
 495       this.update(this.oKeyPad);
 496       this.update(innerHash);
 497       Sha256.prototype.finalize.call(this);
 498     }
 499   };
 500
 501   var exports = createMethod();
 502   exports.sha256 = exports;
 503   exports.sha224 = createMethod(true);
 504   exports.sha256.hmac = createHmacMethod();
 505   exports.sha224.hmac = createHmacMethod(true);
 506
 507   if (COMMON_JS) {
 508     module.exports = exports;
 509   } else {
 510     root.sha256 = exports.sha256;
 511     root.sha224 = exports.sha224;
 512     if (AMD) {
 513       define(function () {
 514         return exports;
 515       });
 516     }
 517   }
 518 })();