pdf.js/src/core/crypto.js

/* Copyright 2012 Mozilla Foundation
 *
 * 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.
 */
/* eslint-disable no-var */

import {
  bytesToString,
  FormatError,
  isArrayEqual,
  PasswordException,
  PasswordResponses,
  stringToBytes,
  unreachable,
  utf8StringToString,
  warn,
} from "../shared/util.js";
import { isDict, isName, Name } from "./primitives.js";
import { DecryptStream } from "./stream.js";

var ARCFourCipher = (function ARCFourCipherClosure() {
  // eslint-disable-next-line no-shadow
  function ARCFourCipher(key) {
    this.a = 0;
    this.b = 0;
    var s = new Uint8Array(256);
    var i,
      j = 0,
      tmp,
      keyLength = key.length;
    for (i = 0; i < 256; ++i) {
      s[i] = i;
    }
    for (i = 0; i < 256; ++i) {
      tmp = s[i];
      j = (j + tmp + key[i % keyLength]) & 0xff;
      s[i] = s[j];
      s[j] = tmp;
    }
    this.s = s;
  }

  ARCFourCipher.prototype = {
    encryptBlock: function ARCFourCipher_encryptBlock(data) {
      var i,
        n = data.length,
        tmp,
        tmp2;
      var a = this.a,
        b = this.b,
        s = this.s;
      var output = new Uint8Array(n);
      for (i = 0; i < n; ++i) {
        a = (a + 1) & 0xff;
        tmp = s[a];
        b = (b + tmp) & 0xff;
        tmp2 = s[b];
        s[a] = tmp2;
        s[b] = tmp;
        output[i] = data[i] ^ s[(tmp + tmp2) & 0xff];
      }
      this.a = a;
      this.b = b;
      return output;
    },
  };
  ARCFourCipher.prototype.decryptBlock = ARCFourCipher.prototype.encryptBlock;
  ARCFourCipher.prototype.encrypt = ARCFourCipher.prototype.encryptBlock;

  return ARCFourCipher;
})();

var calculateMD5 = (function calculateMD5Closure() {
  // prettier-ignore
  var r = new Uint8Array([
    7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
    5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
    4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
    6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21]);

  // prettier-ignore
  var k = new Int32Array([
    -680876936, -389564586, 606105819, -1044525330, -176418897, 1200080426,
    -1473231341, -45705983, 1770035416, -1958414417, -42063, -1990404162,
    1804603682, -40341101, -1502002290, 1236535329, -165796510, -1069501632,
    643717713, -373897302, -701558691, 38016083, -660478335, -405537848,
    568446438, -1019803690, -187363961, 1163531501, -1444681467, -51403784,
    1735328473, -1926607734, -378558, -2022574463, 1839030562, -35309556,
    -1530992060, 1272893353, -155497632, -1094730640, 681279174, -358537222,
    -722521979, 76029189, -640364487, -421815835, 530742520, -995338651,
    -198630844, 1126891415, -1416354905, -57434055, 1700485571, -1894986606,
    -1051523, -2054922799, 1873313359, -30611744, -1560198380, 1309151649,
    -145523070, -1120210379, 718787259, -343485551]);

  function hash(data, offset, length) {
    var h0 = 1732584193,
      h1 = -271733879,
      h2 = -1732584194,
      h3 = 271733878;
    // pre-processing
    var paddedLength = (length + 72) & ~63; // data + 9 extra bytes
    var padded = new Uint8Array(paddedLength);
    var i, j, n;
    for (i = 0; i < length; ++i) {
      padded[i] = data[offset++];
    }
    padded[i++] = 0x80;
    n = paddedLength - 8;
    while (i < n) {
      padded[i++] = 0;
    }
    padded[i++] = (length << 3) & 0xff;
    padded[i++] = (length >> 5) & 0xff;
    padded[i++] = (length >> 13) & 0xff;
    padded[i++] = (length >> 21) & 0xff;
    padded[i++] = (length >>> 29) & 0xff;
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = 0;
    var w = new Int32Array(16);
    for (i = 0; i < paddedLength; ) {
      for (j = 0; j < 16; ++j, i += 4) {
        w[j] =
          padded[i] |
          (padded[i + 1] << 8) |
          (padded[i + 2] << 16) |
          (padded[i + 3] << 24);
      }
      var a = h0,
        b = h1,
        c = h2,
        d = h3,
        f,
        g;
      for (j = 0; j < 64; ++j) {
        if (j < 16) {
          f = (b & c) | (~b & d);
          g = j;
        } else if (j < 32) {
          f = (d & b) | (~d & c);
          g = (5 * j + 1) & 15;
        } else if (j < 48) {
          f = b ^ c ^ d;
          g = (3 * j + 5) & 15;
        } else {
          f = c ^ (b | ~d);
          g = (7 * j) & 15;
        }
        var tmp = d,
          rotateArg = (a + f + k[j] + w[g]) | 0,
          rotate = r[j];
        d = c;
        c = b;
        b = (b + ((rotateArg << rotate) | (rotateArg >>> (32 - rotate)))) | 0;
        a = tmp;
      }
      h0 = (h0 + a) | 0;
      h1 = (h1 + b) | 0;
      h2 = (h2 + c) | 0;
      h3 = (h3 + d) | 0;
    }
    // prettier-ignore
    return new Uint8Array([
      h0 & 0xFF, (h0 >> 8) & 0xFF, (h0 >> 16) & 0xFF, (h0 >>> 24) & 0xFF,
      h1 & 0xFF, (h1 >> 8) & 0xFF, (h1 >> 16) & 0xFF, (h1 >>> 24) & 0xFF,
      h2 & 0xFF, (h2 >> 8) & 0xFF, (h2 >> 16) & 0xFF, (h2 >>> 24) & 0xFF,
      h3 & 0xFF, (h3 >> 8) & 0xFF, (h3 >> 16) & 0xFF, (h3 >>> 24) & 0xFF
    ]);
  }

  return hash;
})();
var Word64 = (function Word64Closure() {
  // eslint-disable-next-line no-shadow
  function Word64(highInteger, lowInteger) {
    this.high = highInteger | 0;
    this.low = lowInteger | 0;
  }
  Word64.prototype = {
    and: function Word64_and(word) {
      this.high &= word.high;
      this.low &= word.low;
    },
    xor: function Word64_xor(word) {
      this.high ^= word.high;
      this.low ^= word.low;
    },

    or: function Word64_or(word) {
      this.high |= word.high;
      this.low |= word.low;
    },

    shiftRight: function Word64_shiftRight(places) {
      if (places >= 32) {
        this.low = (this.high >>> (places - 32)) | 0;
        this.high = 0;
      } else {
        this.low = (this.low >>> places) | (this.high << (32 - places));
        this.high = (this.high >>> places) | 0;
      }
    },

    shiftLeft: function Word64_shiftLeft(places) {
      if (places >= 32) {
        this.high = this.low << (places - 32);
        this.low = 0;
      } else {
        this.high = (this.high << places) | (this.low >>> (32 - places));
        this.low = this.low << places;
      }
    },

    rotateRight: function Word64_rotateRight(places) {
      var low, high;
      if (places & 32) {
        high = this.low;
        low = this.high;
      } else {
        low = this.low;
        high = this.high;
      }
      places &= 31;
      this.low = (low >>> places) | (high << (32 - places));
      this.high = (high >>> places) | (low << (32 - places));
    },

    not: function Word64_not() {
      this.high = ~this.high;
      this.low = ~this.low;
    },

    add: function Word64_add(word) {
      var lowAdd = (this.low >>> 0) + (word.low >>> 0);
      var highAdd = (this.high >>> 0) + (word.high >>> 0);
      if (lowAdd > 0xffffffff) {
        highAdd += 1;
      }
      this.low = lowAdd | 0;
      this.high = highAdd | 0;
    },

    copyTo: function Word64_copyTo(bytes, offset) {
      bytes[offset] = (this.high >>> 24) & 0xff;
      bytes[offset + 1] = (this.high >> 16) & 0xff;
      bytes[offset + 2] = (this.high >> 8) & 0xff;
      bytes[offset + 3] = this.high & 0xff;
      bytes[offset + 4] = (this.low >>> 24) & 0xff;
      bytes[offset + 5] = (this.low >> 16) & 0xff;
      bytes[offset + 6] = (this.low >> 8) & 0xff;
      bytes[offset + 7] = this.low & 0xff;
    },

    assign: function Word64_assign(word) {
      this.high = word.high;
      this.low = word.low;
    },
  };
  return Word64;
})();

var calculateSHA256 = (function calculateSHA256Closure() {
  function rotr(x, n) {
    return (x >>> n) | (x << (32 - n));
  }

  function ch(x, y, z) {
    return (x & y) ^ (~x & z);
  }

  function maj(x, y, z) {
    return (x & y) ^ (x & z) ^ (y & z);
  }

  function sigma(x) {
    return rotr(x, 2) ^ rotr(x, 13) ^ rotr(x, 22);
  }

  function sigmaPrime(x) {
    return rotr(x, 6) ^ rotr(x, 11) ^ rotr(x, 25);
  }

  function littleSigma(x) {
    return rotr(x, 7) ^ rotr(x, 18) ^ (x >>> 3);
  }

  function littleSigmaPrime(x) {
    return rotr(x, 17) ^ rotr(x, 19) ^ (x >>> 10);
  }

  // prettier-ignore
  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];

  function hash(data, offset, length) {
    // initial hash values
    var h0 = 0x6a09e667,
      h1 = 0xbb67ae85,
      h2 = 0x3c6ef372,
      h3 = 0xa54ff53a,
      h4 = 0x510e527f,
      h5 = 0x9b05688c,
      h6 = 0x1f83d9ab,
      h7 = 0x5be0cd19;
    // pre-processing
    var paddedLength = Math.ceil((length + 9) / 64) * 64;
    var padded = new Uint8Array(paddedLength);
    var i, j, n;
    for (i = 0; i < length; ++i) {
      padded[i] = data[offset++];
    }
    padded[i++] = 0x80;
    n = paddedLength - 8;
    while (i < n) {
      padded[i++] = 0;
    }
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = (length >>> 29) & 0xff;
    padded[i++] = (length >> 21) & 0xff;
    padded[i++] = (length >> 13) & 0xff;
    padded[i++] = (length >> 5) & 0xff;
    padded[i++] = (length << 3) & 0xff;
    var w = new Uint32Array(64);
    // for each 512 bit block
    for (i = 0; i < paddedLength; ) {
      for (j = 0; j < 16; ++j) {
        w[j] =
          (padded[i] << 24) |
          (padded[i + 1] << 16) |
          (padded[i + 2] << 8) |
          padded[i + 3];
        i += 4;
      }

      for (j = 16; j < 64; ++j) {
        w[j] =
          (littleSigmaPrime(w[j - 2]) +
            w[j - 7] +
            littleSigma(w[j - 15]) +
            w[j - 16]) |
          0;
      }
      var a = h0,
        b = h1,
        c = h2,
        d = h3,
        e = h4,
        f = h5,
        g = h6,
        h = h7,
        t1,
        t2;
      for (j = 0; j < 64; ++j) {
        t1 = h + sigmaPrime(e) + ch(e, f, g) + k[j] + w[j];
        t2 = sigma(a) + maj(a, b, c);
        h = g;
        g = f;
        f = e;
        e = (d + t1) | 0;
        d = c;
        c = b;
        b = a;
        a = (t1 + t2) | 0;
      }
      h0 = (h0 + a) | 0;
      h1 = (h1 + b) | 0;
      h2 = (h2 + c) | 0;
      h3 = (h3 + d) | 0;
      h4 = (h4 + e) | 0;
      h5 = (h5 + f) | 0;
      h6 = (h6 + g) | 0;
      h7 = (h7 + h) | 0;
    }
    // prettier-ignore
    return new Uint8Array([
      (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,
      (h7 >> 24) & 0xFF, (h7 >> 16) & 0xFF, (h7 >> 8) & 0xFF, (h7) & 0xFF
    ]);
  }

  return hash;
})();

var calculateSHA512 = (function calculateSHA512Closure() {
  function ch(result, x, y, z, tmp) {
    result.assign(x);
    result.and(y);
    tmp.assign(x);
    tmp.not();
    tmp.and(z);
    result.xor(tmp);
  }

  function maj(result, x, y, z, tmp) {
    result.assign(x);
    result.and(y);
    tmp.assign(x);
    tmp.and(z);
    result.xor(tmp);
    tmp.assign(y);
    tmp.and(z);
    result.xor(tmp);
  }

  function sigma(result, x, tmp) {
    result.assign(x);
    result.rotateRight(28);
    tmp.assign(x);
    tmp.rotateRight(34);
    result.xor(tmp);
    tmp.assign(x);
    tmp.rotateRight(39);
    result.xor(tmp);
  }

  function sigmaPrime(result, x, tmp) {
    result.assign(x);
    result.rotateRight(14);
    tmp.assign(x);
    tmp.rotateRight(18);
    result.xor(tmp);
    tmp.assign(x);
    tmp.rotateRight(41);
    result.xor(tmp);
  }

  function littleSigma(result, x, tmp) {
    result.assign(x);
    result.rotateRight(1);
    tmp.assign(x);
    tmp.rotateRight(8);
    result.xor(tmp);
    tmp.assign(x);
    tmp.shiftRight(7);
    result.xor(tmp);
  }

  function littleSigmaPrime(result, x, tmp) {
    result.assign(x);
    result.rotateRight(19);
    tmp.assign(x);
    tmp.rotateRight(61);
    result.xor(tmp);
    tmp.assign(x);
    tmp.shiftRight(6);
    result.xor(tmp);
  }

  // prettier-ignore
  var k = [
    new Word64(0x428a2f98, 0xd728ae22), new Word64(0x71374491, 0x23ef65cd),
    new Word64(0xb5c0fbcf, 0xec4d3b2f), new Word64(0xe9b5dba5, 0x8189dbbc),
    new Word64(0x3956c25b, 0xf348b538), new Word64(0x59f111f1, 0xb605d019),
    new Word64(0x923f82a4, 0xaf194f9b), new Word64(0xab1c5ed5, 0xda6d8118),
    new Word64(0xd807aa98, 0xa3030242), new Word64(0x12835b01, 0x45706fbe),
    new Word64(0x243185be, 0x4ee4b28c), new Word64(0x550c7dc3, 0xd5ffb4e2),
    new Word64(0x72be5d74, 0xf27b896f), new Word64(0x80deb1fe, 0x3b1696b1),
    new Word64(0x9bdc06a7, 0x25c71235), new Word64(0xc19bf174, 0xcf692694),
    new Word64(0xe49b69c1, 0x9ef14ad2), new Word64(0xefbe4786, 0x384f25e3),
    new Word64(0x0fc19dc6, 0x8b8cd5b5), new Word64(0x240ca1cc, 0x77ac9c65),
    new Word64(0x2de92c6f, 0x592b0275), new Word64(0x4a7484aa, 0x6ea6e483),
    new Word64(0x5cb0a9dc, 0xbd41fbd4), new Word64(0x76f988da, 0x831153b5),
    new Word64(0x983e5152, 0xee66dfab), new Word64(0xa831c66d, 0x2db43210),
    new Word64(0xb00327c8, 0x98fb213f), new Word64(0xbf597fc7, 0xbeef0ee4),
    new Word64(0xc6e00bf3, 0x3da88fc2), new Word64(0xd5a79147, 0x930aa725),
    new Word64(0x06ca6351, 0xe003826f), new Word64(0x14292967, 0x0a0e6e70),
    new Word64(0x27b70a85, 0x46d22ffc), new Word64(0x2e1b2138, 0x5c26c926),
    new Word64(0x4d2c6dfc, 0x5ac42aed), new Word64(0x53380d13, 0x9d95b3df),
    new Word64(0x650a7354, 0x8baf63de), new Word64(0x766a0abb, 0x3c77b2a8),
    new Word64(0x81c2c92e, 0x47edaee6), new Word64(0x92722c85, 0x1482353b),
    new Word64(0xa2bfe8a1, 0x4cf10364), new Word64(0xa81a664b, 0xbc423001),
    new Word64(0xc24b8b70, 0xd0f89791), new Word64(0xc76c51a3, 0x0654be30),
    new Word64(0xd192e819, 0xd6ef5218), new Word64(0xd6990624, 0x5565a910),
    new Word64(0xf40e3585, 0x5771202a), new Word64(0x106aa070, 0x32bbd1b8),
    new Word64(0x19a4c116, 0xb8d2d0c8), new Word64(0x1e376c08, 0x5141ab53),
    new Word64(0x2748774c, 0xdf8eeb99), new Word64(0x34b0bcb5, 0xe19b48a8),
    new Word64(0x391c0cb3, 0xc5c95a63), new Word64(0x4ed8aa4a, 0xe3418acb),
    new Word64(0x5b9cca4f, 0x7763e373), new Word64(0x682e6ff3, 0xd6b2b8a3),
    new Word64(0x748f82ee, 0x5defb2fc), new Word64(0x78a5636f, 0x43172f60),
    new Word64(0x84c87814, 0xa1f0ab72), new Word64(0x8cc70208, 0x1a6439ec),
    new Word64(0x90befffa, 0x23631e28), new Word64(0xa4506ceb, 0xde82bde9),
    new Word64(0xbef9a3f7, 0xb2c67915), new Word64(0xc67178f2, 0xe372532b),
    new Word64(0xca273ece, 0xea26619c), new Word64(0xd186b8c7, 0x21c0c207),
    new Word64(0xeada7dd6, 0xcde0eb1e), new Word64(0xf57d4f7f, 0xee6ed178),
    new Word64(0x06f067aa, 0x72176fba), new Word64(0x0a637dc5, 0xa2c898a6),
    new Word64(0x113f9804, 0xbef90dae), new Word64(0x1b710b35, 0x131c471b),
    new Word64(0x28db77f5, 0x23047d84), new Word64(0x32caab7b, 0x40c72493),
    new Word64(0x3c9ebe0a, 0x15c9bebc), new Word64(0x431d67c4, 0x9c100d4c),
    new Word64(0x4cc5d4be, 0xcb3e42b6), new Word64(0x597f299c, 0xfc657e2a),
    new Word64(0x5fcb6fab, 0x3ad6faec), new Word64(0x6c44198c, 0x4a475817)];

  function hash(data, offset, length, mode384) {
    mode384 = !!mode384;
    // initial hash values
    var h0, h1, h2, h3, h4, h5, h6, h7;
    if (!mode384) {
      h0 = new Word64(0x6a09e667, 0xf3bcc908);
      h1 = new Word64(0xbb67ae85, 0x84caa73b);
      h2 = new Word64(0x3c6ef372, 0xfe94f82b);
      h3 = new Word64(0xa54ff53a, 0x5f1d36f1);
      h4 = new Word64(0x510e527f, 0xade682d1);
      h5 = new Word64(0x9b05688c, 0x2b3e6c1f);
      h6 = new Word64(0x1f83d9ab, 0xfb41bd6b);
      h7 = new Word64(0x5be0cd19, 0x137e2179);
    } else {
      // SHA384 is exactly the same
      // except with different starting values and a trimmed result
      h0 = new Word64(0xcbbb9d5d, 0xc1059ed8);
      h1 = new Word64(0x629a292a, 0x367cd507);
      h2 = new Word64(0x9159015a, 0x3070dd17);
      h3 = new Word64(0x152fecd8, 0xf70e5939);
      h4 = new Word64(0x67332667, 0xffc00b31);
      h5 = new Word64(0x8eb44a87, 0x68581511);
      h6 = new Word64(0xdb0c2e0d, 0x64f98fa7);
      h7 = new Word64(0x47b5481d, 0xbefa4fa4);
    }

    // pre-processing
    var paddedLength = Math.ceil((length + 17) / 128) * 128;
    var padded = new Uint8Array(paddedLength);
    var i, j, n;
    for (i = 0; i < length; ++i) {
      padded[i] = data[offset++];
    }
    padded[i++] = 0x80;
    n = paddedLength - 16;
    while (i < n) {
      padded[i++] = 0;
    }
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = 0;
    padded[i++] = (length >>> 29) & 0xff;
    padded[i++] = (length >> 21) & 0xff;
    padded[i++] = (length >> 13) & 0xff;
    padded[i++] = (length >> 5) & 0xff;
    padded[i++] = (length << 3) & 0xff;

    var w = new Array(80);
    for (i = 0; i < 80; i++) {
      w[i] = new Word64(0, 0);
    }
    var a = new Word64(0, 0),
      b = new Word64(0, 0),
      c = new Word64(0, 0);
    var d = new Word64(0, 0),
      e = new Word64(0, 0),
      f = new Word64(0, 0);
    var g = new Word64(0, 0),
      h = new Word64(0, 0);
    var t1 = new Word64(0, 0),
      t2 = new Word64(0, 0);
    var tmp1 = new Word64(0, 0),
      tmp2 = new Word64(0, 0),
      tmp3;

    // for each 1024 bit block
    for (i = 0; i < paddedLength; ) {
      for (j = 0; j < 16; ++j) {
        w[j].high =
          (padded[i] << 24) |
          (padded[i + 1] << 16) |
          (padded[i + 2] << 8) |
          padded[i + 3];
        w[j].low =
          (padded[i + 4] << 24) |
          (padded[i + 5] << 16) |
          (padded[i + 6] << 8) |
          padded[i + 7];
        i += 8;
      }
      for (j = 16; j < 80; ++j) {
        tmp3 = w[j];
        littleSigmaPrime(tmp3, w[j - 2], tmp2);
        tmp3.add(w[j - 7]);
        littleSigma(tmp1, w[j - 15], tmp2);
        tmp3.add(tmp1);
        tmp3.add(w[j - 16]);
      }

      a.assign(h0);
      b.assign(h1);
      c.assign(h2);
      d.assign(h3);
      e.assign(h4);
      f.assign(h5);
      g.assign(h6);
      h.assign(h7);
      for (j = 0; j < 80; ++j) {
        t1.assign(h);
        sigmaPrime(tmp1, e, tmp2);
        t1.add(tmp1);
        ch(tmp1, e, f, g, tmp2);
        t1.add(tmp1);
        t1.add(k[j]);
        t1.add(w[j]);

        sigma(t2, a, tmp2);
        maj(tmp1, a, b, c, tmp2);
        t2.add(tmp1);

        tmp3 = h;
        h = g;
        g = f;
        f = e;
        d.add(t1);
        e = d;
        d = c;
        c = b;
        b = a;
        tmp3.assign(t1);
        tmp3.add(t2);
        a = tmp3;
      }
      h0.add(a);
      h1.add(b);
      h2.add(c);
      h3.add(d);
      h4.add(e);
      h5.add(f);
      h6.add(g);
      h7.add(h);
    }

    var result;
    if (!mode384) {
      result = new Uint8Array(64);
      h0.copyTo(result, 0);
      h1.copyTo(result, 8);
      h2.copyTo(result, 16);
      h3.copyTo(result, 24);
      h4.copyTo(result, 32);
      h5.copyTo(result, 40);
      h6.copyTo(result, 48);
      h7.copyTo(result, 56);
    } else {
      result = new Uint8Array(48);
      h0.copyTo(result, 0);
      h1.copyTo(result, 8);
      h2.copyTo(result, 16);
      h3.copyTo(result, 24);
      h4.copyTo(result, 32);
      h5.copyTo(result, 40);
    }
    return result;
  }

  return hash;
})();
var calculateSHA384 = (function calculateSHA384Closure() {
  function hash(data, offset, length) {
    return calculateSHA512(data, offset, length, true);
  }

  return hash;
})();
var NullCipher = (function NullCipherClosure() {
  // eslint-disable-next-line no-shadow
  function NullCipher() {}

  NullCipher.prototype = {
    decryptBlock: function NullCipher_decryptBlock(data) {
      return data;
    },
    encrypt: function NullCipher_encrypt(data) {
      return data;
    },
  };

  return NullCipher;
})();

class AESBaseCipher {
  constructor() {
    if (this.constructor === AESBaseCipher) {
      unreachable("Cannot initialize AESBaseCipher.");
    }

    // prettier-ignore
    this._s = new Uint8Array([
      0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b,
      0xfe, 0xd7, 0xab, 0x76, 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0,
      0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0, 0xb7, 0xfd, 0x93, 0x26,
      0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
      0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2,
      0xeb, 0x27, 0xb2, 0x75, 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0,
      0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84, 0x53, 0xd1, 0x00, 0xed,
      0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
      0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f,
      0x50, 0x3c, 0x9f, 0xa8, 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5,
      0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2, 0xcd, 0x0c, 0x13, 0xec,
      0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
      0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14,
      0xde, 0x5e, 0x0b, 0xdb, 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c,
      0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79, 0xe7, 0xc8, 0x37, 0x6d,
      0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
      0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f,
      0x4b, 0xbd, 0x8b, 0x8a, 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e,
      0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e, 0xe1, 0xf8, 0x98, 0x11,
      0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
      0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f,
      0xb0, 0x54, 0xbb, 0x16,
    ]);

    // prettier-ignore
    this._inv_s = new Uint8Array([
      0x52, 0x09, 0x6a, 0xd5, 0x30, 0x36, 0xa5, 0x38, 0xbf, 0x40, 0xa3, 0x9e,
      0x81, 0xf3, 0xd7, 0xfb, 0x7c, 0xe3, 0x39, 0x82, 0x9b, 0x2f, 0xff, 0x87,
      0x34, 0x8e, 0x43, 0x44, 0xc4, 0xde, 0xe9, 0xcb, 0x54, 0x7b, 0x94, 0x32,
      0xa6, 0xc2, 0x23, 0x3d, 0xee, 0x4c, 0x95, 0x0b, 0x42, 0xfa, 0xc3, 0x4e,
      0x08, 0x2e, 0xa1, 0x66, 0x28, 0xd9, 0x24, 0xb2, 0x76, 0x5b, 0xa2, 0x49,
      0x6d, 0x8b, 0xd1, 0x25, 0x72, 0xf8, 0xf6, 0x64, 0x86, 0x68, 0x98, 0x16,
      0xd4, 0xa4, 0x5c, 0xcc, 0x5d, 0x65, 0xb6, 0x92, 0x6c, 0x70, 0x48, 0x50,
      0xfd, 0xed, 0xb9, 0xda, 0x5e, 0x15, 0x46, 0x57, 0xa7, 0x8d, 0x9d, 0x84,
      0x90, 0xd8, 0xab, 0x00, 0x8c, 0xbc, 0xd3, 0x0a, 0xf7, 0xe4, 0x58, 0x05,
      0xb8, 0xb3, 0x45, 0x06, 0xd0, 0x2c, 0x1e, 0x8f, 0xca, 0x3f, 0x0f, 0x02,
      0xc1, 0xaf, 0xbd, 0x03, 0x01, 0x13, 0x8a, 0x6b, 0x3a, 0x91, 0x11, 0x41,
      0x4f, 0x67, 0xdc, 0xea, 0x97, 0xf2, 0xcf, 0xce, 0xf0, 0xb4, 0xe6, 0x73,
      0x96, 0xac, 0x74, 0x22, 0xe7, 0xad, 0x35, 0x85, 0xe2, 0xf9, 0x37, 0xe8,
      0x1c, 0x75, 0xdf, 0x6e, 0x47, 0xf1, 0x1a, 0x71, 0x1d, 0x29, 0xc5, 0x89,
      0x6f, 0xb7, 0x62, 0x0e, 0xaa, 0x18, 0xbe, 0x1b, 0xfc, 0x56, 0x3e, 0x4b,
      0xc6, 0xd2, 0x79, 0x20, 0x9a, 0xdb, 0xc0, 0xfe, 0x78, 0xcd, 0x5a, 0xf4,
      0x1f, 0xdd, 0xa8, 0x33, 0x88, 0x07, 0xc7, 0x31, 0xb1, 0x12, 0x10, 0x59,
      0x27, 0x80, 0xec, 0x5f, 0x60, 0x51, 0x7f, 0xa9, 0x19, 0xb5, 0x4a, 0x0d,
      0x2d, 0xe5, 0x7a, 0x9f, 0x93, 0xc9, 0x9c, 0xef, 0xa0, 0xe0, 0x3b, 0x4d,
      0xae, 0x2a, 0xf5, 0xb0, 0xc8, 0xeb, 0xbb, 0x3c, 0x83, 0x53, 0x99, 0x61,
      0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26, 0xe1, 0x69, 0x14, 0x63,
      0x55, 0x21, 0x0c, 0x7d,
    ]);

    // prettier-ignore
    this._mix = new Uint32Array([
      0x00000000, 0x0e090d0b, 0x1c121a16, 0x121b171d, 0x3824342c, 0x362d3927,
      0x24362e3a, 0x2a3f2331, 0x70486858, 0x7e416553, 0x6c5a724e, 0x62537f45,
      0x486c5c74, 0x4665517f, 0x547e4662, 0x5a774b69, 0xe090d0b0, 0xee99ddbb,
      0xfc82caa6, 0xf28bc7ad, 0xd8b4e49c, 0xd6bde997, 0xc4a6fe8a, 0xcaaff381,
      0x90d8b8e8, 0x9ed1b5e3, 0x8ccaa2fe, 0x82c3aff5, 0xa8fc8cc4, 0xa6f581cf,
      0xb4ee96d2, 0xbae79bd9, 0xdb3bbb7b, 0xd532b670, 0xc729a16d, 0xc920ac66,
      0xe31f8f57, 0xed16825c, 0xff0d9541, 0xf104984a, 0xab73d323, 0xa57ade28,
      0xb761c935, 0xb968c43e, 0x9357e70f, 0x9d5eea04, 0x8f45fd19, 0x814cf012,
      0x3bab6bcb, 0x35a266c0, 0x27b971dd, 0x29b07cd6, 0x038f5fe7, 0x0d8652ec,
      0x1f9d45f1, 0x119448fa, 0x4be30393, 0x45ea0e98, 0x57f11985, 0x59f8148e,
      0x73c737bf, 0x7dce3ab4, 0x6fd52da9, 0x61dc20a2, 0xad766df6, 0xa37f60fd,
      0xb16477e0, 0xbf6d7aeb, 0x955259da, 0x9b5b54d1, 0x894043cc, 0x87494ec7,
      0xdd3e05ae, 0xd33708a5, 0xc12c1fb8, 0xcf2512b3, 0xe51a3182, 0xeb133c89,
      0xf9082b94, 0xf701269f, 0x4de6bd46, 0x43efb04d, 0x51f4a750, 0x5ffdaa5b,
      0x75c2896a, 0x7bcb8461, 0x69d0937c, 0x67d99e77, 0x3daed51e, 0x33a7d815,
      0x21bccf08, 0x2fb5c203, 0x058ae132, 0x0b83ec39, 0x1998fb24, 0x1791f62f,
      0x764dd68d, 0x7844db86, 0x6a5fcc9b, 0x6456c190, 0x4e69e2a1, 0x4060efaa,
      0x527bf8b7, 0x5c72f5bc, 0x0605bed5, 0x080cb3de, 0x1a17a4c3, 0x141ea9c8,
      0x3e218af9, 0x302887f2, 0x223390ef, 0x2c3a9de4, 0x96dd063d, 0x98d40b36,
      0x8acf1c2b, 0x84c61120, 0xaef93211, 0xa0f03f1a, 0xb2eb2807, 0xbce2250c,
      0xe6956e65, 0xe89c636e, 0xfa877473, 0xf48e7978, 0xdeb15a49, 0xd0b85742,
      0xc2a3405f, 0xccaa4d54, 0x41ecdaf7, 0x4fe5d7fc, 0x5dfec0e1, 0x53f7cdea,
      0x79c8eedb, 0x77c1e3d0, 0x65daf4cd, 0x6bd3f9c6, 0x31a4b2af, 0x3fadbfa4,
      0x2db6a8b9, 0x23bfa5b2, 0x09808683, 0x07898b88, 0x15929c95, 0x1b9b919e,
      0xa17c0a47, 0xaf75074c, 0xbd6e1051, 0xb3671d5a, 0x99583e6b, 0x97513360,
      0x854a247d, 0x8b432976, 0xd134621f, 0xdf3d6f14, 0xcd267809, 0xc32f7502,
      0xe9105633, 0xe7195b38, 0xf5024c25, 0xfb0b412e, 0x9ad7618c, 0x94de6c87,
      0x86c57b9a, 0x88cc7691, 0xa2f355a0, 0xacfa58ab, 0xbee14fb6, 0xb0e842bd,
      0xea9f09d4, 0xe49604df, 0xf68d13c2, 0xf8841ec9, 0xd2bb3df8, 0xdcb230f3,
      0xcea927ee, 0xc0a02ae5, 0x7a47b13c, 0x744ebc37, 0x6655ab2a, 0x685ca621,
      0x42638510, 0x4c6a881b, 0x5e719f06, 0x5078920d, 0x0a0fd964, 0x0406d46f,
      0x161dc372, 0x1814ce79, 0x322bed48, 0x3c22e043, 0x2e39f75e, 0x2030fa55,
      0xec9ab701, 0xe293ba0a, 0xf088ad17, 0xfe81a01c, 0xd4be832d, 0xdab78e26,
      0xc8ac993b, 0xc6a59430, 0x9cd2df59, 0x92dbd252, 0x80c0c54f, 0x8ec9c844,
      0xa4f6eb75, 0xaaffe67e, 0xb8e4f163, 0xb6edfc68, 0x0c0a67b1, 0x02036aba,
      0x10187da7, 0x1e1170ac, 0x342e539d, 0x3a275e96, 0x283c498b, 0x26354480,
      0x7c420fe9, 0x724b02e2, 0x605015ff, 0x6e5918f4, 0x44663bc5, 0x4a6f36ce,
      0x587421d3, 0x567d2cd8, 0x37a10c7a, 0x39a80171, 0x2bb3166c, 0x25ba1b67,
      0x0f853856, 0x018c355d, 0x13972240, 0x1d9e2f4b, 0x47e96422, 0x49e06929,
      0x5bfb7e34, 0x55f2733f, 0x7fcd500e, 0x71c45d05, 0x63df4a18, 0x6dd64713,
      0xd731dcca, 0xd938d1c1, 0xcb23c6dc, 0xc52acbd7, 0xef15e8e6, 0xe11ce5ed,
      0xf307f2f0, 0xfd0efffb, 0xa779b492, 0xa970b999, 0xbb6bae84, 0xb562a38f,
      0x9f5d80be, 0x91548db5, 0x834f9aa8, 0x8d4697a3,
    ]);

    this._mixCol = new Uint8Array(256);
    for (let i = 0; i < 256; i++) {
      if (i < 128) {
        this._mixCol[i] = i << 1;
      } else {
        this._mixCol[i] = (i << 1) ^ 0x1b;
      }
    }

    this.buffer = new Uint8Array(16);
    this.bufferPosition = 0;
  }

  _expandKey(cipherKey) {
    unreachable("Cannot call `_expandKey` on the base class");
  }

  _decrypt(input, key) {
    let t, u, v;
    const state = new Uint8Array(16);
    state.set(input);

    // AddRoundKey
    for (let j = 0, k = this._keySize; j < 16; ++j, ++k) {
      state[j] ^= key[k];
    }
    for (let i = this._cyclesOfRepetition - 1; i >= 1; --i) {
      // InvShiftRows
      t = state[13];
      state[13] = state[9];
      state[9] = state[5];
      state[5] = state[1];
      state[1] = t;
      t = state[14];
      u = state[10];
      state[14] = state[6];
      state[10] = state[2];
      state[6] = t;
      state[2] = u;
      t = state[15];
      u = state[11];
      v = state[7];
      state[15] = state[3];
      state[11] = t;
      state[7] = u;
      state[3] = v;
      // InvSubBytes
      for (let j = 0; j < 16; ++j) {
        state[j] = this._inv_s[state[j]];
      }
      // AddRoundKey
      for (let j = 0, k = i * 16; j < 16; ++j, ++k) {
        state[j] ^= key[k];
      }
      // InvMixColumns
      for (let j = 0; j < 16; j += 4) {
        const s0 = this._mix[state[j]];
        const s1 = this._mix[state[j + 1]];
        const s2 = this._mix[state[j + 2]];
        const s3 = this._mix[state[j + 3]];
        t =
          s0 ^
          (s1 >>> 8) ^
          (s1 << 24) ^
          (s2 >>> 16) ^
          (s2 << 16) ^
          (s3 >>> 24) ^
          (s3 << 8);
        state[j] = (t >>> 24) & 0xff;
        state[j + 1] = (t >> 16) & 0xff;
        state[j + 2] = (t >> 8) & 0xff;
        state[j + 3] = t & 0xff;
      }
    }
    // InvShiftRows
    t = state[13];
    state[13] = state[9];
    state[9] = state[5];
    state[5] = state[1];
    state[1] = t;
    t = state[14];
    u = state[10];
    state[14] = state[6];
    state[10] = state[2];
    state[6] = t;
    state[2] = u;
    t = state[15];
    u = state[11];
    v = state[7];
    state[15] = state[3];
    state[11] = t;
    state[7] = u;
    state[3] = v;
    for (let j = 0; j < 16; ++j) {
      // InvSubBytes
      state[j] = this._inv_s[state[j]];
      // AddRoundKey
      state[j] ^= key[j];
    }
    return state;
  }

  _encrypt(input, key) {
    const s = this._s;

    let t, u, v;
    const state = new Uint8Array(16);
    state.set(input);

    for (let j = 0; j < 16; ++j) {
      // AddRoundKey
      state[j] ^= key[j];
    }

    for (let i = 1; i < this._cyclesOfRepetition; i++) {
      // SubBytes
      for (let j = 0; j < 16; ++j) {
        state[j] = s[state[j]];
      }
      // ShiftRows
      v = state[1];
      state[1] = state[5];
      state[5] = state[9];
      state[9] = state[13];
      state[13] = v;
      v = state[2];
      u = state[6];
      state[2] = state[10];
      state[6] = state[14];
      state[10] = v;
      state[14] = u;
      v = state[3];
      u = state[7];
      t = state[11];
      state[3] = state[15];
      state[7] = v;
      state[11] = u;
      state[15] = t;
      // MixColumns
      for (let j = 0; j < 16; j += 4) {
        const s0 = state[j + 0];
        const s1 = state[j + 1];
        const s2 = state[j + 2];
        const s3 = state[j + 3];
        t = s0 ^ s1 ^ s2 ^ s3;
        state[j + 0] ^= t ^ this._mixCol[s0 ^ s1];
        state[j + 1] ^= t ^ this._mixCol[s1 ^ s2];
        state[j + 2] ^= t ^ this._mixCol[s2 ^ s3];
        state[j + 3] ^= t ^ this._mixCol[s3 ^ s0];
      }
      // AddRoundKey
      for (let j = 0, k = i * 16; j < 16; ++j, ++k) {
        state[j] ^= key[k];
      }
    }

    // SubBytes
    for (let j = 0; j < 16; ++j) {
      state[j] = s[state[j]];
    }
    // ShiftRows
    v = state[1];
    state[1] = state[5];
    state[5] = state[9];
    state[9] = state[13];
    state[13] = v;
    v = state[2];
    u = state[6];
    state[2] = state[10];
    state[6] = state[14];
    state[10] = v;
    state[14] = u;
    v = state[3];
    u = state[7];
    t = state[11];
    state[3] = state[15];
    state[7] = v;
    state[11] = u;
    state[15] = t;
    // AddRoundKey
    for (let j = 0, k = this._keySize; j < 16; ++j, ++k) {
      state[j] ^= key[k];
    }
    return state;
  }

  _decryptBlock2(data, finalize) {
    const sourceLength = data.length;
    let buffer = this.buffer,
      bufferLength = this.bufferPosition;
    const result = [];
    let iv = this.iv;

    for (let i = 0; i < sourceLength; ++i) {
      buffer[bufferLength] = data[i];
      ++bufferLength;
      if (bufferLength < 16) {
        continue;
      }
      // buffer is full, decrypting
      const plain = this._decrypt(buffer, this._key);
      // xor-ing the IV vector to get plain text
      for (let j = 0; j < 16; ++j) {
        plain[j] ^= iv[j];
      }
      iv = buffer;
      result.push(plain);
      buffer = new Uint8Array(16);
      bufferLength = 0;
    }
    // saving incomplete buffer
    this.buffer = buffer;
    this.bufferLength = bufferLength;
    this.iv = iv;
    if (result.length === 0) {
      return new Uint8Array(0);
    }
    // combining plain text blocks into one
    let outputLength = 16 * result.length;
    if (finalize) {
      // undo a padding that is described in RFC 2898
      const lastBlock = result[result.length - 1];
      let psLen = lastBlock[15];
      if (psLen <= 16) {
        for (let i = 15, ii = 16 - psLen; i >= ii; --i) {
          if (lastBlock[i] !== psLen) {
            // Invalid padding, assume that the block has no padding.
            psLen = 0;
            break;
          }
        }
        outputLength -= psLen;
        result[result.length - 1] = lastBlock.subarray(0, 16 - psLen);
      }
    }
    const output = new Uint8Array(outputLength);
    for (let i = 0, j = 0, ii = result.length; i < ii; ++i, j += 16) {
      output.set(result[i], j);
    }
    return output;
  }

  decryptBlock(data, finalize, iv = null) {
    const sourceLength = data.length;
    const buffer = this.buffer;
    let bufferLength = this.bufferPosition;
    // If an IV is not supplied, wait for IV values. They are at the start
    // of the stream.
    if (iv) {
      this.iv = iv;
    } else {
      for (
        let i = 0;
        bufferLength < 16 && i < sourceLength;
        ++i, ++bufferLength
      ) {
        buffer[bufferLength] = data[i];
      }
      if (bufferLength < 16) {
        // Need more data.
        this.bufferLength = bufferLength;
        return new Uint8Array(0);
      }
      this.iv = buffer;
      data = data.subarray(16);
    }
    this.buffer = new Uint8Array(16);
    this.bufferLength = 0;
    // starting decryption
    this.decryptBlock = this._decryptBlock2;
    return this.decryptBlock(data, finalize);
  }

  encrypt(data, iv) {
    const sourceLength = data.length;
    let buffer = this.buffer,
      bufferLength = this.bufferPosition;
    const result = [];

    if (!iv) {
      iv = new Uint8Array(16);
    }
    for (let i = 0; i < sourceLength; ++i) {
      buffer[bufferLength] = data[i];
      ++bufferLength;
      if (bufferLength < 16) {
        continue;
      }

      for (let j = 0; j < 16; ++j) {
        buffer[j] ^= iv[j];
      }

      // buffer is full, encrypting
      const cipher = this._encrypt(buffer, this._key);
      iv = cipher;
      result.push(cipher);
      buffer = new Uint8Array(16);
      bufferLength = 0;
    }
    // saving incomplete buffer
    this.buffer = buffer;
    this.bufferLength = bufferLength;
    this.iv = iv;
    if (result.length === 0) {
      return new Uint8Array(0);
    }
    // combining plain text blocks into one
    const outputLength = 16 * result.length;
    const output = new Uint8Array(outputLength);
    for (let i = 0, j = 0, ii = result.length; i < ii; ++i, j += 16) {
      output.set(result[i], j);
    }
    return output;
  }
}

class AES128Cipher extends AESBaseCipher {
  constructor(key) {
    super();

    this._cyclesOfRepetition = 10;
    this._keySize = 160; // bits

    // prettier-ignore
    this._rcon = new Uint8Array([
      0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c,
      0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a,
      0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd,
      0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a,
      0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80,
      0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6,
      0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72,
      0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc,
      0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02, 0x04, 0x08, 0x10,
      0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e,
      0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5,
      0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94,
      0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb, 0x8d, 0x01, 0x02,
      0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c, 0xd8, 0xab, 0x4d,
      0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a, 0xd4, 0xb3, 0x7d,
      0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd, 0x61, 0xc2, 0x9f,
      0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a, 0x74, 0xe8, 0xcb,
      0x8d, 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, 0x1b, 0x36, 0x6c,
      0xd8, 0xab, 0x4d, 0x9a, 0x2f, 0x5e, 0xbc, 0x63, 0xc6, 0x97, 0x35, 0x6a,
      0xd4, 0xb3, 0x7d, 0xfa, 0xef, 0xc5, 0x91, 0x39, 0x72, 0xe4, 0xd3, 0xbd,
      0x61, 0xc2, 0x9f, 0x25, 0x4a, 0x94, 0x33, 0x66, 0xcc, 0x83, 0x1d, 0x3a,
      0x74, 0xe8, 0xcb, 0x8d,
    ]);

    this._key = this._expandKey(key);
  }

  _expandKey(cipherKey) {
    const b = 176;
    const s = this._s;
    const rcon = this._rcon;

    const result = new Uint8Array(b);
    result.set(cipherKey);

    for (let j = 16, i = 1; j < b; ++i) {
      // RotWord
      let t1 = result[j - 3];
      let t2 = result[j - 2];
      let t3 = result[j - 1];
      let t4 = result[j - 4];
      // SubWord
      t1 = s[t1];
      t2 = s[t2];
      t3 = s[t3];
      t4 = s[t4];
      // Rcon
      t1 = t1 ^ rcon[i];
      for (let n = 0; n < 4; ++n) {
        result[j] = t1 ^= result[j - 16];
        j++;
        result[j] = t2 ^= result[j - 16];
        j++;
        result[j] = t3 ^= result[j - 16];
        j++;
        result[j] = t4 ^= result[j - 16];
        j++;
      }
    }
    return result;
  }
}

class AES256Cipher extends AESBaseCipher {
  constructor(key) {
    super();

    this._cyclesOfRepetition = 14;
    this._keySize = 224; // bits

    this._key = this._expandKey(key);
  }

  _expandKey(cipherKey) {
    const b = 240;
    const s = this._s;

    const result = new Uint8Array(b);
    result.set(cipherKey);

    let r = 1;
    let t1, t2, t3, t4;
    for (let j = 32, i = 1; j < b; ++i) {
      if (j % 32 === 16) {
        t1 = s[t1];
        t2 = s[t2];
        t3 = s[t3];
        t4 = s[t4];
      } else if (j % 32 === 0) {
        // RotWord
        t1 = result[j - 3];
        t2 = result[j - 2];
        t3 = result[j - 1];
        t4 = result[j - 4];
        // SubWord
        t1 = s[t1];
        t2 = s[t2];
        t3 = s[t3];
        t4 = s[t4];
        // Rcon
        t1 = t1 ^ r;
        if ((r <<= 1) >= 256) {
          r = (r ^ 0x1b) & 0xff;
        }
      }

      for (let n = 0; n < 4; ++n) {
        result[j] = t1 ^= result[j - 32];
        j++;
        result[j] = t2 ^= result[j - 32];
        j++;
        result[j] = t3 ^= result[j - 32];
        j++;
        result[j] = t4 ^= result[j - 32];
        j++;
      }
    }
    return result;
  }
}

var PDF17 = (function PDF17Closure() {
  // eslint-disable-next-line no-shadow
  function PDF17() {}

  PDF17.prototype = {
    checkOwnerPassword: function PDF17_checkOwnerPassword(
      password,
      ownerValidationSalt,
      userBytes,
      ownerPassword
    ) {
      var hashData = new Uint8Array(password.length + 56);
      hashData.set(password, 0);
      hashData.set(ownerValidationSalt, password.length);
      hashData.set(userBytes, password.length + ownerValidationSalt.length);
      var result = calculateSHA256(hashData, 0, hashData.length);
      return isArrayEqual(result, ownerPassword);
    },
    checkUserPassword: function PDF17_checkUserPassword(
      password,
      userValidationSalt,
      userPassword
    ) {
      var hashData = new Uint8Array(password.length + 8);
      hashData.set(password, 0);
      hashData.set(userValidationSalt, password.length);
      var result = calculateSHA256(hashData, 0, hashData.length);
      return isArrayEqual(result, userPassword);
    },
    getOwnerKey: function PDF17_getOwnerKey(
      password,
      ownerKeySalt,
      userBytes,
      ownerEncryption
    ) {
      var hashData = new Uint8Array(password.length + 56);
      hashData.set(password, 0);
      hashData.set(ownerKeySalt, password.length);
      hashData.set(userBytes, password.length + ownerKeySalt.length);
      var key = calculateSHA256(hashData, 0, hashData.length);
      var cipher = new AES256Cipher(key);
      return cipher.decryptBlock(ownerEncryption, false, new Uint8Array(16));
    },
    getUserKey: function PDF17_getUserKey(
      password,
      userKeySalt,
      userEncryption
    ) {
      var hashData = new Uint8Array(password.length + 8);
      hashData.set(password, 0);
      hashData.set(userKeySalt, password.length);
      // `key` is the decryption key for the UE string.
      var key = calculateSHA256(hashData, 0, hashData.length);
      var cipher = new AES256Cipher(key);
      return cipher.decryptBlock(userEncryption, false, new Uint8Array(16));
    },
  };
  return PDF17;
})();

var PDF20 = (function PDF20Closure() {
  function concatArrays(array1, array2) {
    var t = new Uint8Array(array1.length + array2.length);
    t.set(array1, 0);
    t.set(array2, array1.length);
    return t;
  }

  function calculatePDF20Hash(password, input, userBytes) {
    // This refers to Algorithm 2.B as defined in ISO 32000-2.
    var k = calculateSHA256(input, 0, input.length).subarray(0, 32);
    var e = [0];
    var i = 0;
    while (i < 64 || e[e.length - 1] > i - 32) {
      var arrayLength = password.length + k.length + userBytes.length;

      var k1 = new Uint8Array(arrayLength * 64);
      var array = concatArrays(password, k);
      array = concatArrays(array, userBytes);
      for (var j = 0, pos = 0; j < 64; j++, pos += arrayLength) {
        k1.set(array, pos);
      }
      // AES128 CBC NO PADDING with first 16 bytes of k as the key
      // and the second 16 as the iv.
      var cipher = new AES128Cipher(k.subarray(0, 16));
      e = cipher.encrypt(k1, k.subarray(16, 32));
      // Now we have to take the first 16 bytes of an unsigned big endian
      // integer and compute the remainder modulo 3. That is a fairly large
      // number and JavaScript isn't going to handle that well, so we're using
      // a trick that allows us to perform modulo math byte by byte.
      var remainder = 0;
      for (var z = 0; z < 16; z++) {
        remainder *= 256 % 3;
        remainder %= 3;
        remainder += (e[z] >>> 0) % 3;
        remainder %= 3;
      }
      if (remainder === 0) {
        k = calculateSHA256(e, 0, e.length);
      } else if (remainder === 1) {
        k = calculateSHA384(e, 0, e.length);
      } else if (remainder === 2) {
        k = calculateSHA512(e, 0, e.length);
      }
      i++;
    }
    return k.subarray(0, 32);
  }

  // eslint-disable-next-line no-shadow
  function PDF20() {}

  PDF20.prototype = {
    hash: function PDF20_hash(password, concatBytes, userBytes) {
      return calculatePDF20Hash(password, concatBytes, userBytes);
    },
    checkOwnerPassword: function PDF20_checkOwnerPassword(
      password,
      ownerValidationSalt,
      userBytes,
      ownerPassword
    ) {
      var hashData = new Uint8Array(password.length + 56);
      hashData.set(password, 0);
      hashData.set(ownerValidationSalt, password.length);
      hashData.set(userBytes, password.length + ownerValidationSalt.length);
      var result = calculatePDF20Hash(password, hashData, userBytes);
      return isArrayEqual(result, ownerPassword);
    },
    checkUserPassword: function PDF20_checkUserPassword(
      password,
      userValidationSalt,
      userPassword
    ) {
      var hashData = new Uint8Array(password.length + 8);
      hashData.set(password, 0);
      hashData.set(userValidationSalt, password.length);
      var result = calculatePDF20Hash(password, hashData, []);
      return isArrayEqual(result, userPassword);
    },
    getOwnerKey: function PDF20_getOwnerKey(
      password,
      ownerKeySalt,
      userBytes,
      ownerEncryption
    ) {
      var hashData = new Uint8Array(password.length + 56);
      hashData.set(password, 0);
      hashData.set(ownerKeySalt, password.length);
      hashData.set(userBytes, password.length + ownerKeySalt.length);
      var key = calculatePDF20Hash(password, hashData, userBytes);
      var cipher = new AES256Cipher(key);
      return cipher.decryptBlock(ownerEncryption, false, new Uint8Array(16));
    },
    getUserKey: function PDF20_getUserKey(
      password,
      userKeySalt,
      userEncryption
    ) {
      var hashData = new Uint8Array(password.length + 8);
      hashData.set(password, 0);
      hashData.set(userKeySalt, password.length);
      // `key` is the decryption key for the UE string.
      var key = calculatePDF20Hash(password, hashData, []);
      var cipher = new AES256Cipher(key);
      return cipher.decryptBlock(userEncryption, false, new Uint8Array(16));
    },
  };
  return PDF20;
})();

var CipherTransform = (function CipherTransformClosure() {
  // eslint-disable-next-line no-shadow
  function CipherTransform(stringCipherConstructor, streamCipherConstructor) {
    this.StringCipherConstructor = stringCipherConstructor;
    this.StreamCipherConstructor = streamCipherConstructor;
  }

  CipherTransform.prototype = {
    createStream: function CipherTransform_createStream(stream, length) {
      var cipher = new this.StreamCipherConstructor();
      return new DecryptStream(
        stream,
        length,
        function cipherTransformDecryptStream(data, finalize) {
          return cipher.decryptBlock(data, finalize);
        }
      );
    },
    decryptString: function CipherTransform_decryptString(s) {
      var cipher = new this.StringCipherConstructor();
      var data = stringToBytes(s);
      data = cipher.decryptBlock(data, true);
      return bytesToString(data);
    },
    encryptString: function CipherTransform_encryptString(s) {
      const cipher = new this.StringCipherConstructor();
      if (cipher instanceof AESBaseCipher) {
        // Append some chars equal to "16 - (M mod 16)"
        // where M is the string length (see section 7.6.2 in PDF specification)
        // to have a final string where the length is a multiple of 16.
        const strLen = s.length;
        const pad = 16 - (strLen % 16);
        if (pad !== 16) {
          s = s.padEnd(16 * Math.ceil(strLen / 16), String.fromCharCode(pad));
        }

        // Generate an initialization vector
        const iv = new Uint8Array(16);
        if (typeof crypto !== "undefined") {
          crypto.getRandomValues(iv);
        } else {
          for (let i = 0; i < 16; i++) {
            iv[i] = Math.floor(256 * Math.random());
          }
        }

        let data = stringToBytes(s);
        data = cipher.encrypt(data, iv);

        const buf = new Uint8Array(16 + data.length);
        buf.set(iv);
        buf.set(data, 16);

        return bytesToString(buf);
      }

      let data = stringToBytes(s);
      data = cipher.encrypt(data);
      return bytesToString(data);
    },
  };
  return CipherTransform;
})();

var CipherTransformFactory = (function CipherTransformFactoryClosure() {
  // prettier-ignore
  var defaultPasswordBytes = new Uint8Array([
    0x28, 0xBF, 0x4E, 0x5E, 0x4E, 0x75, 0x8A, 0x41,
    0x64, 0x00, 0x4E, 0x56, 0xFF, 0xFA, 0x01, 0x08,
    0x2E, 0x2E, 0x00, 0xB6, 0xD0, 0x68, 0x3E, 0x80,
    0x2F, 0x0C, 0xA9, 0xFE, 0x64, 0x53, 0x69, 0x7A]);

  function createEncryptionKey20(
    revision,
    password,
    ownerPassword,
    ownerValidationSalt,
    ownerKeySalt,
    uBytes,
    userPassword,
    userValidationSalt,
    userKeySalt,
    ownerEncryption,
    userEncryption,
    perms
  ) {
    if (password) {
      var passwordLength = Math.min(127, password.length);
      password = password.subarray(0, passwordLength);
    } else {
      password = [];
    }
    var pdfAlgorithm;
    if (revision === 6) {
      pdfAlgorithm = new PDF20();
    } else {
      pdfAlgorithm = new PDF17();
    }

    if (
      pdfAlgorithm.checkUserPassword(password, userValidationSalt, userPassword)
    ) {
      return pdfAlgorithm.getUserKey(password, userKeySalt, userEncryption);
    } else if (
      password.length &&
      pdfAlgorithm.checkOwnerPassword(
        password,
        ownerValidationSalt,
        uBytes,
        ownerPassword
      )
    ) {
      return pdfAlgorithm.getOwnerKey(
        password,
        ownerKeySalt,
        uBytes,
        ownerEncryption
      );
    }

    return null;
  }

  function prepareKeyData(
    fileId,
    password,
    ownerPassword,
    userPassword,
    flags,
    revision,
    keyLength,
    encryptMetadata
  ) {
    var hashDataSize = 40 + ownerPassword.length + fileId.length;
    var hashData = new Uint8Array(hashDataSize),
      i = 0,
      j,
      n;
    if (password) {
      n = Math.min(32, password.length);
      for (; i < n; ++i) {
        hashData[i] = password[i];
      }
    }
    j = 0;
    while (i < 32) {
      hashData[i++] = defaultPasswordBytes[j++];
    }
    // as now the padded password in the hashData[0..i]
    for (j = 0, n = ownerPassword.length; j < n; ++j) {
      hashData[i++] = ownerPassword[j];
    }
    hashData[i++] = flags & 0xff;
    hashData[i++] = (flags >> 8) & 0xff;
    hashData[i++] = (flags >> 16) & 0xff;
    hashData[i++] = (flags >>> 24) & 0xff;
    for (j = 0, n = fileId.length; j < n; ++j) {
      hashData[i++] = fileId[j];
    }
    if (revision >= 4 && !encryptMetadata) {
      hashData[i++] = 0xff;
      hashData[i++] = 0xff;
      hashData[i++] = 0xff;
      hashData[i++] = 0xff;
    }
    var hash = calculateMD5(hashData, 0, i);
    var keyLengthInBytes = keyLength >> 3;
    if (revision >= 3) {
      for (j = 0; j < 50; ++j) {
        hash = calculateMD5(hash, 0, keyLengthInBytes);
      }
    }
    var encryptionKey = hash.subarray(0, keyLengthInBytes);
    var cipher, checkData;

    if (revision >= 3) {
      for (i = 0; i < 32; ++i) {
        hashData[i] = defaultPasswordBytes[i];
      }
      for (j = 0, n = fileId.length; j < n; ++j) {
        hashData[i++] = fileId[j];
      }
      cipher = new ARCFourCipher(encryptionKey);
      checkData = cipher.encryptBlock(calculateMD5(hashData, 0, i));
      n = encryptionKey.length;
      var derivedKey = new Uint8Array(n),
        k;
      for (j = 1; j <= 19; ++j) {
        for (k = 0; k < n; ++k) {
          derivedKey[k] = encryptionKey[k] ^ j;
        }
        cipher = new ARCFourCipher(derivedKey);
        checkData = cipher.encryptBlock(checkData);
      }
      for (j = 0, n = checkData.length; j < n; ++j) {
        if (userPassword[j] !== checkData[j]) {
          return null;
        }
      }
    } else {
      cipher = new ARCFourCipher(encryptionKey);
      checkData = cipher.encryptBlock(defaultPasswordBytes);
      for (j = 0, n = checkData.length; j < n; ++j) {
        if (userPassword[j] !== checkData[j]) {
          return null;
        }
      }
    }
    return encryptionKey;
  }

  function decodeUserPassword(password, ownerPassword, revision, keyLength) {
    var hashData = new Uint8Array(32),
      i = 0,
      j,
      n;
    n = Math.min(32, password.length);
    for (; i < n; ++i) {
      hashData[i] = password[i];
    }
    j = 0;
    while (i < 32) {
      hashData[i++] = defaultPasswordBytes[j++];
    }
    var hash = calculateMD5(hashData, 0, i);
    var keyLengthInBytes = keyLength >> 3;
    if (revision >= 3) {
      for (j = 0; j < 50; ++j) {
        hash = calculateMD5(hash, 0, hash.length);
      }
    }

    var cipher, userPassword;
    if (revision >= 3) {
      userPassword = ownerPassword;
      var derivedKey = new Uint8Array(keyLengthInBytes),
        k;
      for (j = 19; j >= 0; j--) {
        for (k = 0; k < keyLengthInBytes; ++k) {
          derivedKey[k] = hash[k] ^ j;
        }
        cipher = new ARCFourCipher(derivedKey);
        userPassword = cipher.encryptBlock(userPassword);
      }
    } else {
      cipher = new ARCFourCipher(hash.subarray(0, keyLengthInBytes));
      userPassword = cipher.encryptBlock(ownerPassword);
    }
    return userPassword;
  }

  var identityName = Name.get("Identity");

  // eslint-disable-next-line no-shadow
  function CipherTransformFactory(dict, fileId, password) {
    var filter = dict.get("Filter");
    if (!isName(filter, "Standard")) {
      throw new FormatError("unknown encryption method");
    }
    this.dict = dict;
    var algorithm = dict.get("V");
    if (
      !Number.isInteger(algorithm) ||
      (algorithm !== 1 && algorithm !== 2 && algorithm !== 4 && algorithm !== 5)
    ) {
      throw new FormatError("unsupported encryption algorithm");
    }
    this.algorithm = algorithm;
    var keyLength = dict.get("Length");
    if (!keyLength) {
      // Spec asks to rely on encryption dictionary's Length entry, however
      // some PDFs don't have it. Trying to recover.
      if (algorithm <= 3) {
        // For 1 and 2 it's fixed to 40-bit, for 3 40-bit is a minimal value.
        keyLength = 40;
      } else {
        // Trying to find default handler -- it usually has Length.
        var cfDict = dict.get("CF");
        var streamCryptoName = dict.get("StmF");
        if (isDict(cfDict) && isName(streamCryptoName)) {
          cfDict.suppressEncryption = true; // See comment below.
          var handlerDict = cfDict.get(streamCryptoName.name);
          keyLength = (handlerDict && handlerDict.get("Length")) || 128;
          if (keyLength < 40) {
            // Sometimes it's incorrect value of bits, generators specify bytes.
            keyLength <<= 3;
          }
        }
      }
    }
    if (!Number.isInteger(keyLength) || keyLength < 40 || keyLength % 8 !== 0) {
      throw new FormatError("invalid key length");
    }

    // prepare keys
    var ownerPassword = stringToBytes(dict.get("O")).subarray(0, 32);
    var userPassword = stringToBytes(dict.get("U")).subarray(0, 32);
    var flags = dict.get("P");
    var revision = dict.get("R");
    // meaningful when V is 4 or 5
    var encryptMetadata =
      (algorithm === 4 || algorithm === 5) &&
      dict.get("EncryptMetadata") !== false;
    this.encryptMetadata = encryptMetadata;

    var fileIdBytes = stringToBytes(fileId);
    var passwordBytes;
    if (password) {
      if (revision === 6) {
        try {
          password = utf8StringToString(password);
        } catch (ex) {
          warn(
            "CipherTransformFactory: " +
              "Unable to convert UTF8 encoded password."
          );
        }
      }
      passwordBytes = stringToBytes(password);
    }

    var encryptionKey;
    if (algorithm !== 5) {
      encryptionKey = prepareKeyData(
        fileIdBytes,
        passwordBytes,
        ownerPassword,
        userPassword,
        flags,
        revision,
        keyLength,
        encryptMetadata
      );
    } else {
      var ownerValidationSalt = stringToBytes(dict.get("O")).subarray(32, 40);
      var ownerKeySalt = stringToBytes(dict.get("O")).subarray(40, 48);
      var uBytes = stringToBytes(dict.get("U")).subarray(0, 48);
      var userValidationSalt = stringToBytes(dict.get("U")).subarray(32, 40);
      var userKeySalt = stringToBytes(dict.get("U")).subarray(40, 48);
      var ownerEncryption = stringToBytes(dict.get("OE"));
      var userEncryption = stringToBytes(dict.get("UE"));
      var perms = stringToBytes(dict.get("Perms"));
      encryptionKey = createEncryptionKey20(
        revision,
        passwordBytes,
        ownerPassword,
        ownerValidationSalt,
        ownerKeySalt,
        uBytes,
        userPassword,
        userValidationSalt,
        userKeySalt,
        ownerEncryption,
        userEncryption,
        perms
      );
    }
    if (!encryptionKey && !password) {
      throw new PasswordException(
        "No password given",
        PasswordResponses.NEED_PASSWORD
      );
    } else if (!encryptionKey && password) {
      // Attempting use the password as an owner password
      var decodedPassword = decodeUserPassword(
        passwordBytes,
        ownerPassword,
        revision,
        keyLength
      );
      encryptionKey = prepareKeyData(
        fileIdBytes,
        decodedPassword,
        ownerPassword,
        userPassword,
        flags,
        revision,
        keyLength,
        encryptMetadata
      );
    }

    if (!encryptionKey) {
      throw new PasswordException(
        "Incorrect Password",
        PasswordResponses.INCORRECT_PASSWORD
      );
    }

    this.encryptionKey = encryptionKey;

    if (algorithm >= 4) {
      var cf = dict.get("CF");
      if (isDict(cf)) {
        // The 'CF' dictionary itself should not be encrypted, and by setting
        // `suppressEncryption` we can prevent an infinite loop inside of
        // `XRef_fetchUncompressed` if the dictionary contains indirect objects
        // (fixes issue7665.pdf).
        cf.suppressEncryption = true;
      }
      this.cf = cf;
      this.stmf = dict.get("StmF") || identityName;
      this.strf = dict.get("StrF") || identityName;
      this.eff = dict.get("EFF") || this.stmf;
    }
  }

  function buildObjectKey(num, gen, encryptionKey, isAes) {
    var key = new Uint8Array(encryptionKey.length + 9),
      i,
      n;
    for (i = 0, n = encryptionKey.length; i < n; ++i) {
      key[i] = encryptionKey[i];
    }
    key[i++] = num & 0xff;
    key[i++] = (num >> 8) & 0xff;
    key[i++] = (num >> 16) & 0xff;
    key[i++] = gen & 0xff;
    key[i++] = (gen >> 8) & 0xff;
    if (isAes) {
      key[i++] = 0x73;
      key[i++] = 0x41;
      key[i++] = 0x6c;
      key[i++] = 0x54;
    }
    var hash = calculateMD5(key, 0, i);
    return hash.subarray(0, Math.min(encryptionKey.length + 5, 16));
  }

  function buildCipherConstructor(cf, name, num, gen, key) {
    if (!isName(name)) {
      throw new FormatError("Invalid crypt filter name.");
    }
    var cryptFilter = cf.get(name.name);
    var cfm;
    if (cryptFilter !== null && cryptFilter !== undefined) {
      cfm = cryptFilter.get("CFM");
    }
    if (!cfm || cfm.name === "None") {
      return function cipherTransformFactoryBuildCipherConstructorNone() {
        return new NullCipher();
      };
    }
    if (cfm.name === "V2") {
      return function cipherTransformFactoryBuildCipherConstructorV2() {
        return new ARCFourCipher(buildObjectKey(num, gen, key, false));
      };
    }
    if (cfm.name === "AESV2") {
      return function cipherTransformFactoryBuildCipherConstructorAESV2() {
        return new AES128Cipher(buildObjectKey(num, gen, key, true));
      };
    }
    if (cfm.name === "AESV3") {
      return function cipherTransformFactoryBuildCipherConstructorAESV3() {
        return new AES256Cipher(key);
      };
    }
    throw new FormatError("Unknown crypto method");
  }

  CipherTransformFactory.prototype = {
    createCipherTransform: function CipherTransformFactory_createCipherTransform(
      num,
      gen
    ) {
      if (this.algorithm === 4 || this.algorithm === 5) {
        return new CipherTransform(
          buildCipherConstructor(
            this.cf,
            this.stmf,
            num,
            gen,
            this.encryptionKey
          ),
          buildCipherConstructor(
            this.cf,
            this.strf,
            num,
            gen,
            this.encryptionKey
          )
        );
      }
      // algorithms 1 and 2
      var key = buildObjectKey(num, gen, this.encryptionKey, false);
      var cipherConstructor = function buildCipherCipherConstructor() {
        return new ARCFourCipher(key);
      };
      return new CipherTransform(cipherConstructor, cipherConstructor);
    },
  };

  return CipherTransformFactory;
})();

export {
  AES128Cipher,
  AES256Cipher,
  ARCFourCipher,
  calculateMD5,
  calculateSHA256,
  calculateSHA384,
  calculateSHA512,
  CipherTransformFactory,
  PDF17,
  PDF20,
};