reader/utils/sha1.js

  
/*
 * [js-sha1]{@link https://github.com/emn178/js-sha1}
 *
 * @version 0.6.0
 * @author Chen, Yi-Cyuan [emn178@gmail.com]
 * @copyright Chen, Yi-Cyuan 2014-2017
 * @license MIT
 */
/*jslint bitwise: true */
(function() {
    'use strict';
  
    var root = typeof window === 'object' ? window : {};
    var NODE_JS = !root.JS_SHA1_NO_NODE_JS && typeof process === 'object' && process.versions && process.versions.node;
    if (NODE_JS) {
      root = global;
    }
    var COMMON_JS = !root.JS_SHA1_NO_COMMON_JS && typeof module === 'object' && module.exports;
    var AMD = typeof define === 'function' && define.amd;
    var HEX_CHARS = '0123456789abcdef'.split('');
    var EXTRA = [-2147483648, 8388608, 32768, 128];
    var SHIFT = [24, 16, 8, 0];
    var OUTPUT_TYPES = ['hex', 'array', 'digest', 'arrayBuffer'];
  
    var blocks = [];
  
    var createOutputMethod = function (outputType) {
      return function (message) {
        return new Sha1(true).update(message)[outputType]();
      };
    };
  
    var createMethod = function () {
      var method = createOutputMethod('hex');
      if (NODE_JS) {
        method = nodeWrap(method);
      }
      method.create = function () {
        return new Sha1();
      };
      method.update = function (message) {
        return method.create().update(message);
      };
      for (var i = 0; i < OUTPUT_TYPES.length; ++i) {
        var type = OUTPUT_TYPES[i];
        method[type] = createOutputMethod(type);
      }
      return method;
    };
  
    var nodeWrap = function (method) {
      var crypto = eval("require('crypto')");
      var Buffer = eval("require('buffer').Buffer");
      var nodeMethod = function (message) {
        if (typeof message === 'string') {
          return crypto.createHash('sha1').update(message, 'utf8').digest('hex');
        } else if (message.constructor === ArrayBuffer) {
          message = new Uint8Array(message);
        } else if (message.length === undefined) {
          return method(message);
        }
        return crypto.createHash('sha1').update(new Buffer(message)).digest('hex');
      };
      return nodeMethod;
    };
  
    function Sha1(sharedMemory) {
      if (sharedMemory) {
        blocks[0] = blocks[16] = blocks[1] = blocks[2] = blocks[3] =
        blocks[4] = blocks[5] = blocks[6] = blocks[7] =
        blocks[8] = blocks[9] = blocks[10] = blocks[11] =
        blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
        this.blocks = blocks;
      } else {
        this.blocks = [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0];
      }
  
      this.h0 = 0x67452301;
      this.h1 = 0xEFCDAB89;
      this.h2 = 0x98BADCFE;
      this.h3 = 0x10325476;
      this.h4 = 0xC3D2E1F0;
  
      this.block = this.start = this.bytes = this.hBytes = 0;
      this.finalized = this.hashed = false;
      this.first = true;
    }
  
    Sha1.prototype.update = function (message) {
      if (this.finalized) {
        return;
      }
      var notString = typeof(message) !== 'string';
      if (notString && message.constructor === root.ArrayBuffer) {
        message = new Uint8Array(message);
      }
      var code, index = 0, i, length = message.length || 0, blocks = this.blocks;
  
      while (index < length) {
        if (this.hashed) {
          this.hashed = false;
          blocks[0] = this.block;
          blocks[16] = blocks[1] = blocks[2] = blocks[3] =
          blocks[4] = blocks[5] = blocks[6] = blocks[7] =
          blocks[8] = blocks[9] = blocks[10] = blocks[11] =
          blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
        }
  
        if(notString) {
          for (i = this.start; index < length && i < 64; ++index) {
            blocks[i >> 2] |= message[index] << SHIFT[i++ & 3];
          }
        } else {
          for (i = this.start; index < length && i < 64; ++index) {
            code = message.charCodeAt(index);
            if (code < 0x80) {
              blocks[i >> 2] |= code << SHIFT[i++ & 3];
            } else if (code < 0x800) {
              blocks[i >> 2] |= (0xc0 | (code >> 6)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
            } else if (code < 0xd800 || code >= 0xe000) {
              blocks[i >> 2] |= (0xe0 | (code >> 12)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
            } else {
              code = 0x10000 + (((code & 0x3ff) << 10) | (message.charCodeAt(++index) & 0x3ff));
              blocks[i >> 2] |= (0xf0 | (code >> 18)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | ((code >> 12) & 0x3f)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | ((code >> 6) & 0x3f)) << SHIFT[i++ & 3];
              blocks[i >> 2] |= (0x80 | (code & 0x3f)) << SHIFT[i++ & 3];
            }
          }
        }
  
        this.lastByteIndex = i;
        this.bytes += i - this.start;
        if (i >= 64) {
          this.block = blocks[16];
          this.start = i - 64;
          this.hash();
          this.hashed = true;
        } else {
          this.start = i;
        }
      }
      if (this.bytes > 4294967295) {
        this.hBytes += this.bytes / 4294967296 << 0;
        this.bytes = this.bytes % 4294967296;
      }
      return this;
    };
  
    Sha1.prototype.finalize = function () {
      if (this.finalized) {
        return;
      }
      this.finalized = true;
      var blocks = this.blocks, i = this.lastByteIndex;
      blocks[16] = this.block;
      blocks[i >> 2] |= EXTRA[i & 3];
      this.block = blocks[16];
      if (i >= 56) {
        if (!this.hashed) {
          this.hash();
        }
        blocks[0] = this.block;
        blocks[16] = blocks[1] = blocks[2] = blocks[3] =
        blocks[4] = blocks[5] = blocks[6] = blocks[7] =
        blocks[8] = blocks[9] = blocks[10] = blocks[11] =
        blocks[12] = blocks[13] = blocks[14] = blocks[15] = 0;
      }
      blocks[14] = this.hBytes << 3 | this.bytes >>> 29;
      blocks[15] = this.bytes << 3;
      this.hash();
    };
  
    Sha1.prototype.hash = function () {
      var a = this.h0, b = this.h1, c = this.h2, d = this.h3, e = this.h4;
      var f, j, t, blocks = this.blocks;
  
      for(j = 16; j < 80; ++j) {
        t = blocks[j - 3] ^ blocks[j - 8] ^ blocks[j - 14] ^ blocks[j - 16];
        blocks[j] =  (t << 1) | (t >>> 31);
      }
  
      for(j = 0; j < 20; j += 5) {
        f = (b & c) | ((~b) & d);
        t = (a << 5) | (a >>> 27);
        e = t + f + e + 1518500249 + blocks[j] << 0;
        b = (b << 30) | (b >>> 2);
  
        f = (a & b) | ((~a) & c);
        t = (e << 5) | (e >>> 27);
        d = t + f + d + 1518500249 + blocks[j + 1] << 0;
        a = (a << 30) | (a >>> 2);
  
        f = (e & a) | ((~e) & b);
        t = (d << 5) | (d >>> 27);
        c = t + f + c + 1518500249 + blocks[j + 2] << 0;
        e = (e << 30) | (e >>> 2);
  
        f = (d & e) | ((~d) & a);
        t = (c << 5) | (c >>> 27);
        b = t + f + b + 1518500249 + blocks[j + 3] << 0;
        d = (d << 30) | (d >>> 2);
  
        f = (c & d) | ((~c) & e);
        t = (b << 5) | (b >>> 27);
        a = t + f + a + 1518500249 + blocks[j + 4] << 0;
        c = (c << 30) | (c >>> 2);
      }
  
      for(; j < 40; j += 5) {
        f = b ^ c ^ d;
        t = (a << 5) | (a >>> 27);
        e = t + f + e + 1859775393 + blocks[j] << 0;
        b = (b << 30) | (b >>> 2);
  
        f = a ^ b ^ c;
        t = (e << 5) | (e >>> 27);
        d = t + f + d + 1859775393 + blocks[j + 1] << 0;
        a = (a << 30) | (a >>> 2);
  
        f = e ^ a ^ b;
        t = (d << 5) | (d >>> 27);
        c = t + f + c + 1859775393 + blocks[j + 2] << 0;
        e = (e << 30) | (e >>> 2);
  
        f = d ^ e ^ a;
        t = (c << 5) | (c >>> 27);
        b = t + f + b + 1859775393 + blocks[j + 3] << 0;
        d = (d << 30) | (d >>> 2);
  
        f = c ^ d ^ e;
        t = (b << 5) | (b >>> 27);
        a = t + f + a + 1859775393 + blocks[j + 4] << 0;
        c = (c << 30) | (c >>> 2);
      }
  
      for(; j < 60; j += 5) {
        f = (b & c) | (b & d) | (c & d);
        t = (a << 5) | (a >>> 27);
        e = t + f + e - 1894007588 + blocks[j] << 0;
        b = (b << 30) | (b >>> 2);
  
        f = (a & b) | (a & c) | (b & c);
        t = (e << 5) | (e >>> 27);
        d = t + f + d - 1894007588 + blocks[j + 1] << 0;
        a = (a << 30) | (a >>> 2);
  
        f = (e & a) | (e & b) | (a & b);
        t = (d << 5) | (d >>> 27);
        c = t + f + c - 1894007588 + blocks[j + 2] << 0;
        e = (e << 30) | (e >>> 2);
  
        f = (d & e) | (d & a) | (e & a);
        t = (c << 5) | (c >>> 27);
        b = t + f + b - 1894007588 + blocks[j + 3] << 0;
        d = (d << 30) | (d >>> 2);
  
        f = (c & d) | (c & e) | (d & e);
        t = (b << 5) | (b >>> 27);
        a = t + f + a - 1894007588 + blocks[j + 4] << 0;
        c = (c << 30) | (c >>> 2);
      }
  
      for(; j < 80; j += 5) {
        f = b ^ c ^ d;
        t = (a << 5) | (a >>> 27);
        e = t + f + e - 899497514 + blocks[j] << 0;
        b = (b << 30) | (b >>> 2);
  
        f = a ^ b ^ c;
        t = (e << 5) | (e >>> 27);
        d = t + f + d - 899497514 + blocks[j + 1] << 0;
        a = (a << 30) | (a >>> 2);
  
        f = e ^ a ^ b;
        t = (d << 5) | (d >>> 27);
        c = t + f + c - 899497514 + blocks[j + 2] << 0;
        e = (e << 30) | (e >>> 2);
  
        f = d ^ e ^ a;
        t = (c << 5) | (c >>> 27);
        b = t + f + b - 899497514 + blocks[j + 3] << 0;
        d = (d << 30) | (d >>> 2);
  
        f = c ^ d ^ e;
        t = (b << 5) | (b >>> 27);
        a = t + f + a - 899497514 + blocks[j + 4] << 0;
        c = (c << 30) | (c >>> 2);
      }
  
      this.h0 = this.h0 + a << 0;
      this.h1 = this.h1 + b << 0;
      this.h2 = this.h2 + c << 0;
      this.h3 = this.h3 + d << 0;
      this.h4 = this.h4 + e << 0;
    };
  
    Sha1.prototype.hex = function () {
      this.finalize();
  
      var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3, h4 = this.h4;
  
      return HEX_CHARS[(h0 >> 28) & 0x0F] + HEX_CHARS[(h0 >> 24) & 0x0F] +
             HEX_CHARS[(h0 >> 20) & 0x0F] + HEX_CHARS[(h0 >> 16) & 0x0F] +
             HEX_CHARS[(h0 >> 12) & 0x0F] + HEX_CHARS[(h0 >> 8) & 0x0F] +
             HEX_CHARS[(h0 >> 4) & 0x0F] + HEX_CHARS[h0 & 0x0F] +
             HEX_CHARS[(h1 >> 28) & 0x0F] + HEX_CHARS[(h1 >> 24) & 0x0F] +
             HEX_CHARS[(h1 >> 20) & 0x0F] + HEX_CHARS[(h1 >> 16) & 0x0F] +
             HEX_CHARS[(h1 >> 12) & 0x0F] + HEX_CHARS[(h1 >> 8) & 0x0F] +
             HEX_CHARS[(h1 >> 4) & 0x0F] + HEX_CHARS[h1 & 0x0F] +
             HEX_CHARS[(h2 >> 28) & 0x0F] + HEX_CHARS[(h2 >> 24) & 0x0F] +
             HEX_CHARS[(h2 >> 20) & 0x0F] + HEX_CHARS[(h2 >> 16) & 0x0F] +
             HEX_CHARS[(h2 >> 12) & 0x0F] + HEX_CHARS[(h2 >> 8) & 0x0F] +
             HEX_CHARS[(h2 >> 4) & 0x0F] + HEX_CHARS[h2 & 0x0F] +
             HEX_CHARS[(h3 >> 28) & 0x0F] + HEX_CHARS[(h3 >> 24) & 0x0F] +
             HEX_CHARS[(h3 >> 20) & 0x0F] + HEX_CHARS[(h3 >> 16) & 0x0F] +
             HEX_CHARS[(h3 >> 12) & 0x0F] + HEX_CHARS[(h3 >> 8) & 0x0F] +
             HEX_CHARS[(h3 >> 4) & 0x0F] + HEX_CHARS[h3 & 0x0F] +
             HEX_CHARS[(h4 >> 28) & 0x0F] + HEX_CHARS[(h4 >> 24) & 0x0F] +
             HEX_CHARS[(h4 >> 20) & 0x0F] + HEX_CHARS[(h4 >> 16) & 0x0F] +
             HEX_CHARS[(h4 >> 12) & 0x0F] + HEX_CHARS[(h4 >> 8) & 0x0F] +
             HEX_CHARS[(h4 >> 4) & 0x0F] + HEX_CHARS[h4 & 0x0F];
    };
  
    Sha1.prototype.toString = Sha1.prototype.hex;
  
    Sha1.prototype.digest = function () {
      this.finalize();
  
      var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3, h4 = this.h4;
  
      return [
        (h0 >> 24) & 0xFF, (h0 >> 16) & 0xFF, (h0 >> 8) & 0xFF, h0 & 0xFF,
        (h1 >> 24) & 0xFF, (h1 >> 16) & 0xFF, (h1 >> 8) & 0xFF, h1 & 0xFF,
        (h2 >> 24) & 0xFF, (h2 >> 16) & 0xFF, (h2 >> 8) & 0xFF, h2 & 0xFF,
        (h3 >> 24) & 0xFF, (h3 >> 16) & 0xFF, (h3 >> 8) & 0xFF, h3 & 0xFF,
        (h4 >> 24) & 0xFF, (h4 >> 16) & 0xFF, (h4 >> 8) & 0xFF, h4 & 0xFF
      ];
    };
  
    Sha1.prototype.array = Sha1.prototype.digest;
  
    Sha1.prototype.arrayBuffer = function () {
      this.finalize();
  
      var buffer = new ArrayBuffer(20);
      var dataView = new DataView(buffer);
      dataView.setUint32(0, this.h0);
      dataView.setUint32(4, this.h1);
      dataView.setUint32(8, this.h2);
      dataView.setUint32(12, this.h3);
      dataView.setUint32(16, this.h4);
      return buffer;
    };
  
    var exports = createMethod();
  
    if (COMMON_JS) {
      module.exports = exports;
    } else {
      root.sha1 = exports;
      if (AMD) {
        define(function () {
          return exports;
        });
      }
    }
  })();