node_modules/node-firefox-forward-ports/node_modules/adbkit/node_modules/node-forge/js/rc2.js - cordova-firefoxos - Git at Google

 /**
  * 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
  */
 (function() {
 /* ########## Begin module implementation ########## */
 function initModule(forge) {

 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 */
 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);
 };

 } // end module implementation

 /* ########## Begin module wrapper ########## */
 var name = 'rc2';
 if(typeof define !== 'function') {
   // NodeJS -> AMD
   if(typeof module === 'object' && module.exports) {
     var nodeJS = true;
     define = function(ids, factory) {
       factory(require, module);
     };
   } else {
     // <script>
     if(typeof forge === 'undefined') {
       forge = {};
     }
     return initModule(forge);
   }
 }
 // AMD
 var deps;
 var defineFunc = function(require, module) {
   module.exports = function(forge) {
     var mods = deps.map(function(dep) {
       return require(dep);
     }).concat(initModule);
     // handle circular dependencies
     forge = forge || {};
     forge.defined = forge.defined || {};
     if(forge.defined[name]) {
       return forge[name];
     }
     forge.defined[name] = true;
     for(var i = 0; i < mods.length; ++i) {
       mods[i](forge);
     }
     return forge[name];
   };
 };
 var tmpDefine = define;
 define = function(ids, factory) {
   deps = (typeof ids === 'string') ? factory.slice(2) : ids.slice(2);
   if(nodeJS) {
     delete define;
     return tmpDefine.apply(null, Array.prototype.slice.call(arguments, 0));
   }
   define = tmpDefine;
   return define.apply(null, Array.prototype.slice.call(arguments, 0));
 };
 define(['require', 'module', './util'], function() {
   defineFunc.apply(null, Array.prototype.slice.call(arguments, 0));
 });
 })();
	/**
	* 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
	*/
	(function() {
	/* ########## Begin module implementation ########## */
	function initModule(forge) {

	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 */
	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);
	};

	} // end module implementation

	/* ########## Begin module wrapper ########## */
	var name = 'rc2';
	if(typeof define !== 'function') {
	// NodeJS -> AMD
	if(typeof module === 'object' && module.exports) {
	var nodeJS = true;
	define = function(ids, factory) {
	factory(require, module);
	};
	} else {
	// <script>
	if(typeof forge === 'undefined') {
	forge = {};
	}
	return initModule(forge);
	}
	}
	// AMD
	var deps;
	var defineFunc = function(require, module) {
	module.exports = function(forge) {
	var mods = deps.map(function(dep) {
	return require(dep);
	}).concat(initModule);
	// handle circular dependencies
	forge = forge \|\| {};
	forge.defined = forge.defined \|\| {};
	if(forge.defined[name]) {
	return forge[name];
	}
	forge.defined[name] = true;
	for(var i = 0; i < mods.length; ++i) {
	mods[i](forge);
	}
	return forge[name];
	};
	};
	var tmpDefine = define;
	define = function(ids, factory) {
	deps = (typeof ids === 'string') ? factory.slice(2) : ids.slice(2);
	if(nodeJS) {
	delete define;
	return tmpDefine.apply(null, Array.prototype.slice.call(arguments, 0));
	}
	define = tmpDefine;
	return define.apply(null, Array.prototype.slice.call(arguments, 0));
	};
	define(['require', 'module', './util'], function() {
	defineFunc.apply(null, Array.prototype.slice.call(arguments, 0));
	});
	})();