dela/scripts/auth.js

/*
	Copyright (c) 2023 Kasyanov Nikolay Alexeyevich (Unbewohnte)
*/


const AuthHeaderKey = "Auth";
const AuthSeparator = "<->" // username<->password
const authStorageUsername = "username";
const authStoragePassword = "password";


function encodeStringBase64(string) {
    return btoa(
        encodeURIComponent(string).replace(/%([0-9A-F]{2})/g, function to_bytes(match, p) {
            return String.fromCharCode('0x' + p);
        })
    );
}

// Returns properly constructed string containing authentication information 
function authString(login, password) {
    return String(login) + String(AuthSeparator) + String(password);
}

// Returns properly constructed string containing authentication information, encodes afterwards 
function authStringEncoded(login, password) {
    return encodeStringBase64(authString(login, password));
}

// Saves auth information to local storage  
function rememberAuthInfo(username, password) {
    localStorage.setItem(authStorageUsername, username);
    localStorage.setItem(authStoragePassword, password);
}

// Retrieves user's login from local storage
function getUsername() {
  return localStorage.getItem(authStorageUsername);
}

// Retrieves user's password from local storage
function getUserPassword() {
    return localStorage.getItem(authStoragePassword);
}

// Removes all auth information from local storage 
function forgetAuthInfo() {
  localStorage.removeItem(authStorageUsername);
  localStorage.removeItem(authStoragePassword);
}

/**
 * [js-sha256]{@link https://github.com/emn178/js-sha256}
 *
 * @version 0.9.0
 * @author Chen, Yi-Cyuan [emn178@gmail.com]
 * @copyright Chen, Yi-Cyuan 2014-2017
 * @license MIT
 */
/*jslint bitwise: true */
(function () {
    'use strict';
  
    var ERROR = 'input is invalid type';
    var WINDOW = typeof window === 'object';
    var root = WINDOW ? window : {};
    if (root.JS_SHA256_NO_WINDOW) {
      WINDOW = false;
    }
    var WEB_WORKER = !WINDOW && typeof self === 'object';
    var NODE_JS = !root.JS_SHA256_NO_NODE_JS && typeof process === 'object' && process.versions && process.versions.node;
    if (NODE_JS) {
      root = global;
    } else if (WEB_WORKER) {
      root = self;
    }
    var COMMON_JS = !root.JS_SHA256_NO_COMMON_JS && typeof module === 'object' && module.exports;
    var AMD = typeof define === 'function' && define.amd;
    var ARRAY_BUFFER = !root.JS_SHA256_NO_ARRAY_BUFFER && typeof ArrayBuffer !== 'undefined';
    var HEX_CHARS = '0123456789abcdef'.split('');
    var EXTRA = [-2147483648, 8388608, 32768, 128];
    var SHIFT = [24, 16, 8, 0];
    var K = [
      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
    ];
    var OUTPUT_TYPES = ['hex', 'array', 'digest', 'arrayBuffer'];
  
    var blocks = [];
  
    if (root.JS_SHA256_NO_NODE_JS || !Array.isArray) {
      Array.isArray = function (obj) {
        return Object.prototype.toString.call(obj) === '[object Array]';
      };
    }
  
    if (ARRAY_BUFFER && (root.JS_SHA256_NO_ARRAY_BUFFER_IS_VIEW || !ArrayBuffer.isView)) {
      ArrayBuffer.isView = function (obj) {
        return typeof obj === 'object' && obj.buffer && obj.buffer.constructor === ArrayBuffer;
      };
    }
  
    var createOutputMethod = function (outputType, is224) {
      return function (message) {
        return new Sha256(is224, true).update(message)[outputType]();
      };
    };
  
    var createMethod = function (is224) {
      var method = createOutputMethod('hex', is224);
      if (NODE_JS) {
        method = nodeWrap(method, is224);
      }
      method.create = function () {
        return new Sha256(is224);
      };
      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, is224);
      }
      return method;
    };
  
    var nodeWrap = function (method, is224) {
      var crypto = eval("require('crypto')");
      var Buffer = eval("require('buffer').Buffer");
      var algorithm = is224 ? 'sha224' : 'sha256';
      var nodeMethod = function (message) {
        if (typeof message === 'string') {
          return crypto.createHash(algorithm).update(message, 'utf8').digest('hex');
        } else {
          if (message === null || message === undefined) {
            throw new Error(ERROR);
          } else if (message.constructor === ArrayBuffer) {
            message = new Uint8Array(message);
          }
        }
        if (Array.isArray(message) || ArrayBuffer.isView(message) ||
          message.constructor === Buffer) {
          return crypto.createHash(algorithm).update(new Buffer(message)).digest('hex');
        } else {
          return method(message);
        }
      };
      return nodeMethod;
    };
  
    var createHmacOutputMethod = function (outputType, is224) {
      return function (key, message) {
        return new HmacSha256(key, is224, true).update(message)[outputType]();
      };
    };
  
    var createHmacMethod = function (is224) {
      var method = createHmacOutputMethod('hex', is224);
      method.create = function (key) {
        return new HmacSha256(key, is224);
      };
      method.update = function (key, message) {
        return method.create(key).update(message);
      };
      for (var i = 0; i < OUTPUT_TYPES.length; ++i) {
        var type = OUTPUT_TYPES[i];
        method[type] = createHmacOutputMethod(type, is224);
      }
      return method;
    };
  
    function Sha256(is224, 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];
      }
  
      if (is224) {
        this.h0 = 0xc1059ed8;
        this.h1 = 0x367cd507;
        this.h2 = 0x3070dd17;
        this.h3 = 0xf70e5939;
        this.h4 = 0xffc00b31;
        this.h5 = 0x68581511;
        this.h6 = 0x64f98fa7;
        this.h7 = 0xbefa4fa4;
      } else { // 256
        this.h0 = 0x6a09e667;
        this.h1 = 0xbb67ae85;
        this.h2 = 0x3c6ef372;
        this.h3 = 0xa54ff53a;
        this.h4 = 0x510e527f;
        this.h5 = 0x9b05688c;
        this.h6 = 0x1f83d9ab;
        this.h7 = 0x5be0cd19;
      }
  
      this.block = this.start = this.bytes = this.hBytes = 0;
      this.finalized = this.hashed = false;
      this.first = true;
      this.is224 = is224;
    }
  
    Sha256.prototype.update = function (message) {
      if (this.finalized) {
        return;
      }
      var notString, type = typeof message;
      if (type !== 'string') {
        if (type === 'object') {
          if (message === null) {
            throw new Error(ERROR);
          } else if (ARRAY_BUFFER && message.constructor === ArrayBuffer) {
            message = new Uint8Array(message);
          } else if (!Array.isArray(message)) {
            if (!ARRAY_BUFFER || !ArrayBuffer.isView(message)) {
              throw new Error(ERROR);
            }
          }
        } else {
          throw new Error(ERROR);
        }
        notString = true;
      }
      var code, index = 0, i, length = message.length, 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;
    };
  
    Sha256.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();
    };
  
    Sha256.prototype.hash = function () {
      var a = this.h0, b = this.h1, c = this.h2, d = this.h3, e = this.h4, f = this.h5, g = this.h6,
        h = this.h7, blocks = this.blocks, j, s0, s1, maj, t1, t2, ch, ab, da, cd, bc;
  
      for (j = 16; j < 64; ++j) {
        // rightrotate
        t1 = blocks[j - 15];
        s0 = ((t1 >>> 7) | (t1 << 25)) ^ ((t1 >>> 18) | (t1 << 14)) ^ (t1 >>> 3);
        t1 = blocks[j - 2];
        s1 = ((t1 >>> 17) | (t1 << 15)) ^ ((t1 >>> 19) | (t1 << 13)) ^ (t1 >>> 10);
        blocks[j] = blocks[j - 16] + s0 + blocks[j - 7] + s1 << 0;
      }
  
      bc = b & c;
      for (j = 0; j < 64; j += 4) {
        if (this.first) {
          if (this.is224) {
            ab = 300032;
            t1 = blocks[0] - 1413257819;
            h = t1 - 150054599 << 0;
            d = t1 + 24177077 << 0;
          } else {
            ab = 704751109;
            t1 = blocks[0] - 210244248;
            h = t1 - 1521486534 << 0;
            d = t1 + 143694565 << 0;
          }
          this.first = false;
        } else {
          s0 = ((a >>> 2) | (a << 30)) ^ ((a >>> 13) | (a << 19)) ^ ((a >>> 22) | (a << 10));
          s1 = ((e >>> 6) | (e << 26)) ^ ((e >>> 11) | (e << 21)) ^ ((e >>> 25) | (e << 7));
          ab = a & b;
          maj = ab ^ (a & c) ^ bc;
          ch = (e & f) ^ (~e & g);
          t1 = h + s1 + ch + K[j] + blocks[j];
          t2 = s0 + maj;
          h = d + t1 << 0;
          d = t1 + t2 << 0;
        }
        s0 = ((d >>> 2) | (d << 30)) ^ ((d >>> 13) | (d << 19)) ^ ((d >>> 22) | (d << 10));
        s1 = ((h >>> 6) | (h << 26)) ^ ((h >>> 11) | (h << 21)) ^ ((h >>> 25) | (h << 7));
        da = d & a;
        maj = da ^ (d & b) ^ ab;
        ch = (h & e) ^ (~h & f);
        t1 = g + s1 + ch + K[j + 1] + blocks[j + 1];
        t2 = s0 + maj;
        g = c + t1 << 0;
        c = t1 + t2 << 0;
        s0 = ((c >>> 2) | (c << 30)) ^ ((c >>> 13) | (c << 19)) ^ ((c >>> 22) | (c << 10));
        s1 = ((g >>> 6) | (g << 26)) ^ ((g >>> 11) | (g << 21)) ^ ((g >>> 25) | (g << 7));
        cd = c & d;
        maj = cd ^ (c & a) ^ da;
        ch = (g & h) ^ (~g & e);
        t1 = f + s1 + ch + K[j + 2] + blocks[j + 2];
        t2 = s0 + maj;
        f = b + t1 << 0;
        b = t1 + t2 << 0;
        s0 = ((b >>> 2) | (b << 30)) ^ ((b >>> 13) | (b << 19)) ^ ((b >>> 22) | (b << 10));
        s1 = ((f >>> 6) | (f << 26)) ^ ((f >>> 11) | (f << 21)) ^ ((f >>> 25) | (f << 7));
        bc = b & c;
        maj = bc ^ (b & d) ^ cd;
        ch = (f & g) ^ (~f & h);
        t1 = e + s1 + ch + K[j + 3] + blocks[j + 3];
        t2 = s0 + maj;
        e = a + t1 << 0;
        a = t1 + t2 << 0;
      }
  
      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;
      this.h5 = this.h5 + f << 0;
      this.h6 = this.h6 + g << 0;
      this.h7 = this.h7 + h << 0;
    };
  
    Sha256.prototype.hex = function () {
      this.finalize();
  
      var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3, h4 = this.h4, h5 = this.h5,
        h6 = this.h6, h7 = this.h7;
  
      var hex = 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] +
        HEX_CHARS[(h5 >> 28) & 0x0F] + HEX_CHARS[(h5 >> 24) & 0x0F] +
        HEX_CHARS[(h5 >> 20) & 0x0F] + HEX_CHARS[(h5 >> 16) & 0x0F] +
        HEX_CHARS[(h5 >> 12) & 0x0F] + HEX_CHARS[(h5 >> 8) & 0x0F] +
        HEX_CHARS[(h5 >> 4) & 0x0F] + HEX_CHARS[h5 & 0x0F] +
        HEX_CHARS[(h6 >> 28) & 0x0F] + HEX_CHARS[(h6 >> 24) & 0x0F] +
        HEX_CHARS[(h6 >> 20) & 0x0F] + HEX_CHARS[(h6 >> 16) & 0x0F] +
        HEX_CHARS[(h6 >> 12) & 0x0F] + HEX_CHARS[(h6 >> 8) & 0x0F] +
        HEX_CHARS[(h6 >> 4) & 0x0F] + HEX_CHARS[h6 & 0x0F];
      if (!this.is224) {
        hex += HEX_CHARS[(h7 >> 28) & 0x0F] + HEX_CHARS[(h7 >> 24) & 0x0F] +
          HEX_CHARS[(h7 >> 20) & 0x0F] + HEX_CHARS[(h7 >> 16) & 0x0F] +
          HEX_CHARS[(h7 >> 12) & 0x0F] + HEX_CHARS[(h7 >> 8) & 0x0F] +
          HEX_CHARS[(h7 >> 4) & 0x0F] + HEX_CHARS[h7 & 0x0F];
      }
      return hex;
    };
  
    Sha256.prototype.toString = Sha256.prototype.hex;
  
    Sha256.prototype.digest = function () {
      this.finalize();
  
      var h0 = this.h0, h1 = this.h1, h2 = this.h2, h3 = this.h3, h4 = this.h4, h5 = this.h5,
        h6 = this.h6, h7 = this.h7;
  
      var arr = [
        (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,
        (h5 >> 24) & 0xFF, (h5 >> 16) & 0xFF, (h5 >> 8) & 0xFF, h5 & 0xFF,
        (h6 >> 24) & 0xFF, (h6 >> 16) & 0xFF, (h6 >> 8) & 0xFF, h6 & 0xFF
      ];
      if (!this.is224) {
        arr.push((h7 >> 24) & 0xFF, (h7 >> 16) & 0xFF, (h7 >> 8) & 0xFF, h7 & 0xFF);
      }
      return arr;
    };
  
    Sha256.prototype.array = Sha256.prototype.digest;
  
    Sha256.prototype.arrayBuffer = function () {
      this.finalize();
  
      var buffer = new ArrayBuffer(this.is224 ? 28 : 32);
      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);
      dataView.setUint32(20, this.h5);
      dataView.setUint32(24, this.h6);
      if (!this.is224) {
        dataView.setUint32(28, this.h7);
      }
      return buffer;
    };
  
    function HmacSha256(key, is224, sharedMemory) {
      var i, type = typeof key;
      if (type === 'string') {
        var bytes = [], length = key.length, index = 0, code;
        for (i = 0; i < length; ++i) {
          code = key.charCodeAt(i);
          if (code < 0x80) {
            bytes[index++] = code;
          } else if (code < 0x800) {
            bytes[index++] = (0xc0 | (code >> 6));
            bytes[index++] = (0x80 | (code & 0x3f));
          } else if (code < 0xd800 || code >= 0xe000) {
            bytes[index++] = (0xe0 | (code >> 12));
            bytes[index++] = (0x80 | ((code >> 6) & 0x3f));
            bytes[index++] = (0x80 | (code & 0x3f));
          } else {
            code = 0x10000 + (((code & 0x3ff) << 10) | (key.charCodeAt(++i) & 0x3ff));
            bytes[index++] = (0xf0 | (code >> 18));
            bytes[index++] = (0x80 | ((code >> 12) & 0x3f));
            bytes[index++] = (0x80 | ((code >> 6) & 0x3f));
            bytes[index++] = (0x80 | (code & 0x3f));
          }
        }
        key = bytes;
      } else {
        if (type === 'object') {
          if (key === null) {
            throw new Error(ERROR);
          } else if (ARRAY_BUFFER && key.constructor === ArrayBuffer) {
            key = new Uint8Array(key);
          } else if (!Array.isArray(key)) {
            if (!ARRAY_BUFFER || !ArrayBuffer.isView(key)) {
              throw new Error(ERROR);
            }
          }
        } else {
          throw new Error(ERROR);
        }
      }
  
      if (key.length > 64) {
        key = (new Sha256(is224, true)).update(key).array();
      }
  
      var oKeyPad = [], iKeyPad = [];
      for (i = 0; i < 64; ++i) {
        var b = key[i] || 0;
        oKeyPad[i] = 0x5c ^ b;
        iKeyPad[i] = 0x36 ^ b;
      }
  
      Sha256.call(this, is224, sharedMemory);
  
      this.update(iKeyPad);
      this.oKeyPad = oKeyPad;
      this.inner = true;
      this.sharedMemory = sharedMemory;
    }
    HmacSha256.prototype = new Sha256();
  
    HmacSha256.prototype.finalize = function () {
      Sha256.prototype.finalize.call(this);
      if (this.inner) {
        this.inner = false;
        var innerHash = this.array();
        Sha256.call(this, this.is224, this.sharedMemory);
        this.update(this.oKeyPad);
        this.update(innerHash);
        Sha256.prototype.finalize.call(this);
      }
    };
  
    var exports = createMethod();
    exports.sha256 = exports;
    exports.sha224 = createMethod(true);
    exports.sha256.hmac = createHmacMethod();
    exports.sha224.hmac = createHmacMethod(true);
  
    if (COMMON_JS) {
      module.exports = exports;
    } else {
      root.sha256 = exports.sha256;
      root.sha224 = exports.sha224;
      if (AMD) {
        define(function () {
          return exports;
        });
      }
    }
  })();