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Filename : mode-ctr-gladman.js
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import {
  BlockCipherMode,
} from './cipher-core.js';

const incWord = (word) => {
  let _word = word;

  if (((word >> 24) & 0xff) === 0xff) { // overflow
    let b1 = (word >> 16) & 0xff;
    let b2 = (word >> 8) & 0xff;
    let b3 = word & 0xff;

    if (b1 === 0xff) { // overflow b1
      b1 = 0;
      if (b2 === 0xff) {
        b2 = 0;
        if (b3 === 0xff) {
          b3 = 0;
        } else {
          b3 += 1;
        }
      } else {
        b2 += 1;
      }
    } else {
      b1 += 1;
    }

    _word = 0;
    _word += (b1 << 16);
    _word += (b2 << 8);
    _word += b3;
  } else {
    _word += (0x01 << 24);
  }
  return _word;
};

const incCounter = (counter) => {
  const _counter = counter;
  _counter[0] = incWord(_counter[0]);

  if (_counter[0] === 0) {
    // encr_data in fileenc.c from  Dr Brian Gladman's counts only with DWORD j < 8
    _counter[1] = incWord(_counter[1]);
  }
  return _counter;
};

/** @preserve
 * Counter block mode compatible with  Dr Brian Gladman fileenc.c
 * derived from CryptoJS.mode.CTR
 * Jan Hruby jhruby.web@gmail.com
 */
export class CTRGladman extends BlockCipherMode {
}
CTRGladman.Encryptor = class extends CTRGladman {
  processBlock(words, offset) {
    const _words = words;

    // Shortcuts
    const cipher = this._cipher;
    const { blockSize } = cipher;
    const iv = this._iv;
    let counter = this._counter;

    // Generate keystream
    if (iv) {
      this._counter = iv.slice(0);
      counter = this._counter;

      // Remove IV for subsequent blocks
      this._iv = undefined;
    }

    incCounter(counter);

    const keystream = counter.slice(0);
    cipher.encryptBlock(keystream, 0);

    // Encrypt
    for (let i = 0; i < blockSize; i += 1) {
      _words[offset + i] ^= keystream[i];
    }
  }
};
CTRGladman.Decryptor = CTRGladman.Encryptor;