text: /**
   * RC2 implementation.
   *
   * @author Stefan Siegl
   *
   * Copyright (c) 2012 Stefan Siegl <stesie@brokenpipe.de>
   *
   * Information on the RC2 cipher is available from RFC #2268,
   * http://www.ietf.org/rfc/rfc2268.txt
   */
  var forge = require('./forge');
  require('./util');
  
  var piTable = [
    0xd9, 0x78, 0xf9, 0xc4, 0x19, 0xdd, 0xb5, 0xed, 0x28, 0xe9, 0xfd, 0x79, 0x4a, 0xa0, 0xd8, 0x9d,
    0xc6, 0x7e, 0x37, 0x83, 0x2b, 0x76, 0x53, 0x8e, 0x62, 0x4c, 0x64, 0x88, 0x44, 0x8b, 0xfb, 0xa2,
    0x17, 0x9a, 0x59, 0xf5, 0x87, 0xb3, 0x4f, 0x13, 0x61, 0x45, 0x6d, 0x8d, 0x09, 0x81, 0x7d, 0x32,
    0xbd, 0x8f, 0x40, 0xeb, 0x86, 0xb7, 0x7b, 0x0b, 0xf0, 0x95, 0x21, 0x22, 0x5c, 0x6b, 0x4e, 0x82,
    0x54, 0xd6, 0x65, 0x93, 0xce, 0x60, 0xb2, 0x1c, 0x73, 0x56, 0xc0, 0x14, 0xa7, 0x8c, 0xf1, 0xdc,
    0x12, 0x75, 0xca, 0x1f, 0x3b, 0xbe, 0xe4, 0xd1, 0x42, 0x3d, 0xd4, 0x30, 0xa3, 0x3c, 0xb6, 0x26,
    0x6f, 0xbf, 0x0e, 0xda, 0x46, 0x69, 0x07, 0x57, 0x27, 0xf2, 0x1d, 0x9b, 0xbc, 0x94, 0x43, 0x03,
    0xf8, 0x11, 0xc7, 0xf6, 0x90, 0xef, 0x3e, 0xe7, 0x06, 0xc3, 0xd5, 0x2f, 0xc8, 0x66, 0x1e, 0xd7,
    0x08, 0xe8, 0xea, 0xde, 0x80, 0x52, 0xee, 0xf7, 0x84, 0xaa, 0x72, 0xac, 0x35, 0x4d, 0x6a, 0x2a,
    0x96, 0x1a, 0xd2, 0x71, 0x5a, 0x15, 0x49, 0x74, 0x4b, 0x9f, 0xd0, 0x5e, 0x04, 0x18, 0xa4, 0xec,
    0xc2, 0xe0, 0x41, 0x6e, 0x0f, 0x51, 0xcb, 0xcc, 0x24, 0x91, 0xaf, 0x50, 0xa1, 0xf4, 0x70, 0x39,
    0x99, 0x7c, 0x3a, 0x85, 0x23, 0xb8, 0xb4, 0x7a, 0xfc, 0x02, 0x36, 0x5b, 0x25, 0x55, 0x97, 0x31,
    0x2d, 0x5d, 0xfa, 0x98, 0xe3, 0x8a, 0x92, 0xae, 0x05, 0xdf, 0x29, 0x10, 0x67, 0x6c, 0xba, 0xc9,
    0xd3, 0x00, 0xe6, 0xcf, 0xe1, 0x9e, 0xa8, 0x2c, 0x63, 0x16, 0x01, 0x3f, 0x58, 0xe2, 0x89, 0xa9,
    0x0d, 0x38, 0x34, 0x1b, 0xab, 0x33, 0xff, 0xb0, 0xbb, 0x48, 0x0c, 0x5f, 0xb9, 0xb1, 0xcd, 0x2e,
    0xc5, 0xf3, 0xdb, 0x47, 0xe5, 0xa5, 0x9c, 0x77, 0x0a, 0xa6, 0x20, 0x68, 0xfe, 0x7f, 0xc1, 0xad
  ];
  
  var s = [1, 2, 3, 5];
  
  /**
   * Rotate a word left by given number of bits.
   *
   * Bits that are shifted out on the left are put back in on the right
   * hand side.
   *
   * @param word The word to shift left.
   * @param bits The number of bits to shift by.
   * @return The rotated word.
   */
  var rol = function(word, bits) {
    return ((word << bits) & 0xffff) | ((word & 0xffff) >> (16 - bits));
  };
  
  /**
   * Rotate a word right by given number of bits.
   *
   * Bits that are shifted out on the right are put back in on the left
   * hand side.
   *
   * @param word The word to shift right.
   * @param bits The number of bits to shift by.
   * @return The rotated word.
   */
  var ror = function(word, bits) {
    return ((word & 0xffff) >> bits) | ((word << (16 - bits)) & 0xffff);
  };
  
  /* RC2 API */
  module.exports = forge.rc2 = forge.rc2 || {};
  
  /**
   * Perform RC2 key expansion as per RFC #2268, section 2.
   *
   * @param key variable-length user key (between 1 and 128 bytes)
   * @param effKeyBits number of effective key bits (default: 128)
   * @return the expanded RC2 key (ByteBuffer of 128 bytes)
   */
  forge.rc2.expandKey = function(key, effKeyBits) {
    if(typeof key === 'string') {
      key = forge.util.createBuffer(key);
    }
    effKeyBits = effKeyBits || 128;
  
    /* introduce variables that match the names used in RFC #2268 */
    var L = key;
    var T = key.length();
    var T1 = effKeyBits;
    var T8 = Math.ceil(T1 / 8);
    var TM = 0xff >> (T1 & 0x07);
    var i;
  
    for(i = T; i < 128; i++) {
      L.putByte(piTable[(L.at(i - 1) + L.at(i - T)) & 0xff]);
    }
  
    L.setAt(128 - T8, piTable[L.at(128 - T8) & TM]);
  
    for(i = 127 - T8; i >= 0; i--) {
      L.setAt(i, piTable[L.at(i + 1) ^ L.at(i + T8)]);
    }
  
    return L;
  };
  
  /**
   * Creates a RC2 cipher object.
   *
   * @param key the symmetric key to use (as base for key generation).
   * @param bits the number of effective key bits.
   * @param encrypt false for decryption, true for encryption.
   *
   * @return the cipher.
   */
  var createCipher = function(key, bits, encrypt) {
    var _finish = false, _input = null, _output = null, _iv = null;
    var mixRound, mashRound;
    var i, j, K = [];
  
    /* Expand key and fill into K[] Array */
    key = forge.rc2.expandKey(key, bits);
    for(i = 0; i < 64; i++) {
      K.push(key.getInt16Le());
    }
  
    if(encrypt) {
      /**
       * Perform one mixing round "in place".
       *
       * @param R Array of four words to perform mixing on.
       */
      mixRound = function(R) {
        for(i = 0; i < 4; i++) {
          R[i] += K[j] + (R[(i + 3) % 4] & R[(i + 2) % 4]) +
            ((~R[(i + 3) % 4]) & R[(i + 1) % 4]);
          R[i] = rol(R[i], s[i]);
          j++;
        }
      };
  
      /**
       * Perform one mashing round "in place".
       *
       * @param R Array of four words to perform mashing on.
       */
      mashRound = function(R) {
        for(i = 0; i < 4; i++) {
          R[i] += K[R[(i + 3) % 4] & 63];
        }
      };
    } else {
      /**
       * Perform one r-mixing round "in place".
       *
       * @param R Array of four words to perform mixing on.
       */
      mixRound = function(R) {
        for(i = 3; i >= 0; i--) {
          R[i] = ror(R[i], s[i]);
          R[i] -= K[j] + (R[(i + 3) % 4] & R[(i + 2) % 4]) +
            ((~R[(i + 3) % 4]) & R[(i + 1) % 4]);
          j--;
        }
      };
  
      /**
       * Perform one r-mashing round "in place".
       *
       * @param R Array of four words to perform mashing on.
       */
      mashRound = function(R) {
        for(i = 3; i >= 0; i--) {
          R[i] -= K[R[(i + 3) % 4] & 63];
        }
      };
    }
  
    /**
     * Run the specified cipher execution plan.
     *
     * This function takes four words from the input buffer, applies the IV on
     * it (if requested) and runs the provided execution plan.
     *
     * The plan must be put together in form of a array of arrays.  Where the
     * outer one is simply a list of steps to perform and the inner one needs
     * to have two elements: the first one telling how many rounds to perform,
     * the second one telling what to do (i.e. the function to call).
     *
     * @param {Array} plan The plan to execute.
     */
    var runPlan = function(plan) {
      var R = [];
  
      /* Get data from input buffer and fill the four words into R */
      for(i = 0; i < 4; i++) {
        var val = _input.getInt16Le();
  
        if(_iv !== null) {
          if(encrypt) {
            /* We're encrypting, apply the IV first. */
            val ^= _iv.getInt16Le();
          } else {
            /* We're decryption, keep cipher text for next block. */
            _iv.putInt16Le(val);
          }
        }
  
        R.push(val & 0xffff);
      }
  
      /* Reset global "j" variable as per spec. */
      j = encrypt ? 0 : 63;
  
      /* Run execution plan. */
      for(var ptr = 0; ptr < plan.length; ptr++) {
        for(var ctr = 0; ctr < plan[ptr][0]; ctr++) {
          plan[ptr][1](R);
        }
      }
  
      /* Write back result to output buffer. */
      for(i = 0; i < 4; i++) {
        if(_iv !== null) {
          if(encrypt) {
            /* We're encrypting in CBC-mode, feed back encrypted bytes into
               IV buffer to carry it forward to next block. */
            _iv.putInt16Le(R[i]);
          } else {
            R[i] ^= _iv.getInt16Le();
          }
        }
  
        _output.putInt16Le(R[i]);
      }
    };
  
    /* Create cipher object */
    var cipher = null;
    cipher = {
      /**
       * Starts or restarts the encryption or decryption process, whichever
       * was previously configured.
       *
       * To use the cipher in CBC mode, iv may be given either as a string
       * of bytes, or as a byte buffer.  For ECB mode, give null as iv.
       *
       * @param iv the initialization vector to use, null for ECB mode.
       * @param output the output the buffer to write to, null to create one.
       */
      start: function(iv, output) {
        if(iv) {
          /* CBC mode */
          if(typeof iv === 'string') {
            iv = forge.util.createBuffer(iv);
          }
        }
  
        _finish = false;
        _input = forge.util.createBuffer();
        _output = output || new forge.util.createBuffer();
        _iv = iv;
  
        cipher.output = _output;
      },
  
      /**
       * Updates the next block.
       *
       * @param input the buffer to read from.
       */
      update: function(input) {
        if(!_finish) {
          // not finishing, so fill the input buffer with more input
          _input.putBuffer(input);
        }
  
        while(_input.length() >= 8) {
          runPlan([
              [ 5, mixRound ],
              [ 1, mashRound ],
              [ 6, mixRound ],
              [ 1, mashRound ],
              [ 5, mixRound ]
            ]);
        }
      },
  
      /**
       * Finishes encrypting or decrypting.
       *
       * @param pad a padding function to use, null for PKCS#7 padding,
       *           signature(blockSize, buffer, decrypt).
       *
       * @return true if successful, false on error.
       */
      finish: function(pad) {
        var rval = true;
  
        if(encrypt) {
          if(pad) {
            rval = pad(8, _input, !encrypt);
          } else {
            // add PKCS#7 padding to block (each pad byte is the
            // value of the number of pad bytes)
            var padding = (_input.length() === 8) ? 8 : (8 - _input.length());
            _input.fillWithByte(padding, padding);
          }
        }
  
        if(rval) {
          // do final update
          _finish = true;
          cipher.update();
        }
  
        if(!encrypt) {
          // check for error: input data not a multiple of block size
          rval = (_input.length() === 0);
          if(rval) {
            if(pad) {
              rval = pad(8, _output, !encrypt);
            } else {
              // ensure padding byte count is valid
              var len = _output.length();
              var count = _output.at(len - 1);
  
              if(count > len) {
                rval = false;
              } else {
                // trim off padding bytes
                _output.truncate(count);
              }
            }
          }
        }
  
        return rval;
      }
    };
  
    return cipher;
  };
  
  /**
   * Creates an RC2 cipher object to encrypt data in ECB or CBC mode using the
   * given symmetric key. The output will be stored in the 'output' member
   * of the returned cipher.
   *
   * The key and iv may be given as a string of bytes or a byte buffer.
   * The cipher is initialized to use 128 effective key bits.
   *
   * @param key the symmetric key to use.
   * @param iv the initialization vector to use.
   * @param output the buffer to write to, null to create one.
   *
   * @return the cipher.
   */
  forge.rc2.startEncrypting = function(key, iv, output) {
    var cipher = forge.rc2.createEncryptionCipher(key, 128);
    cipher.start(iv, output);
    return cipher;
  };
  
  /**
   * Creates an RC2 cipher object to encrypt data in ECB or CBC mode using the
   * given symmetric key.
   *
   * The key may be given as a string of bytes or a byte buffer.
   *
   * To start encrypting call start() on the cipher with an iv and optional
   * output buffer.
   *
   * @param key the symmetric key to use.
   *
   * @return the cipher.
   */
  forge.rc2.createEncryptionCipher = function(key, bits) {
    return createCipher(key, bits, true);
  };
  
  /**
   * Creates an RC2 cipher object to decrypt data in ECB or CBC mode using the
   * given symmetric key. The output will be stored in the 'output' member
   * of the returned cipher.
   *
   * The key and iv may be given as a string of bytes or a byte buffer.
   * The cipher is initialized to use 128 effective key bits.
   *
   * @param key the symmetric key to use.
   * @param iv the initialization vector to use.
   * @param output the buffer to write to, null to create one.
   *
   * @return the cipher.
   */
  forge.rc2.startDecrypting = function(key, iv, output) {
    var cipher = forge.rc2.createDecryptionCipher(key, 128);
    cipher.start(iv, output);
    return cipher;
  };
  
  /**
   * Creates an RC2 cipher object to decrypt data in ECB or CBC mode using the
   * given symmetric key.
   *
   * The key may be given as a string of bytes or a byte buffer.
   *
   * To start decrypting call start() on the cipher with an iv and optional
   * output buffer.
   *
   * @param key the symmetric key to use.
   *
   * @return the cipher.
   */
  forge.rc2.createDecryptionCipher = function(key, bits) {
    return createCipher(key, bits, false);
  };
  