/*

Copyright 2008-2011 Clipperz Srl

This file is part of Clipperz's Javascript Crypto Library.
Javascript Crypto Library provides web developers with an extensive
and efficient set of cryptographic functions. The library aims to
obtain maximum execution speed while preserving modularity and
reusability.
For further information about its features and functionalities please
refer to http://www.clipperz.com

* Javascript Crypto Library is free software: you can redistribute
  it and/or modify it under the terms of the GNU Affero General Public
  License as published by the Free Software Foundation, either version
  3 of the License, or (at your option) any later version.

* Javascript Crypto Library is distributed in the hope that it will
  be useful, but WITHOUT ANY WARRANTY; without even the implied
  warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU Affero General Public License for more details.

* You should have received a copy of the GNU Affero General Public
  License along with Javascript Crypto Library.  If not, see
  <http://www.gnu.org/licenses/>.

*/

if (typeof(Clipperz) == 'undefined') { Clipperz = {}; }
if (typeof(Clipperz.PM) == 'undefined') { Clipperz.PM = {}; }
if (typeof(Clipperz.PM.Crypto) == 'undefined') { Clipperz.PM.Crypto = {}; }

Clipperz.PM.Crypto.VERSION = "0.2";
Clipperz.PM.Crypto.NAME = "Clipperz.PM.Crypto";

Clipperz.PM.Crypto.encryptingFunctions = {};

MochiKit.Base.update(Clipperz.PM.Crypto, {

	'__repr__': function () {
		return "[" + this.NAME + " " + this.VERSION + "]";
	},

	//-------------------------------------------------------------------------

	'toString': function () {
		return this.__repr__();
	},

	//-------------------------------------------------------------------------
/*
	'communicationProtocol': {
		'currentVersion': '0.2',
		'versions': {
			'0.1': Clipperz.PM.Connection.SRP['1.0'],	//Clipperz.Crypto.SRP.versions['1.0'].Connection,
			'0.2': Clipperz.PM.Connection.SRP['1.1']	//Clipperz.Crypto.SRP.versions['1.1'].Connection
		},
		'fallbackVersions': {
			'current':	'0.1',
			'0.2':		'0.1',
			'0.1':		null
		}
	},
*/
	//-------------------------------------------------------------------------

	'encryptingFunctions': {
		'currentVersion': '0.3',
		'versions': {

		//#####################################################################

			'0.1': {
				'encrypt': function(aKey, aValue) {
					return Clipperz.Crypto.Base.encryptUsingSecretKey(aKey, Clipperz.Base.serializeJSON(aValue));
				},
			
				'deferredEncrypt': function(aKey, aValue) {
					var deferredResult;
					
					deferredResult = new Clipperz.Async.Deferred("Crypto[0.1].deferredEncrypt");
					deferredResult.addCallback(Clipperz.PM.Crypto.encryptingFunctions.versions['0.1'].encrypt, aKey, aValue);
					deferredResult.callback();
					
					return deferredResult;
				},
				
				'decrypt': function(aKey, aValue) {
					var result;
				
					if (aValue != null) {
						result = Clipperz.Base.evalJSON(Clipperz.Crypto.Base.decryptUsingSecretKey(aKey, aValue));
					} else {
						result = null;
					}
				
					return result;
				},
				
				'deferredDecrypt': function(aKey, aValue) {
					var deferredResult;
					
					deferredResult = new Clipperz.Async.Deferred("Crypto.[0.1].deferredDecrypt");
					deferredResult.addCallback(Clipperz.PM.Crypto.encryptingFunctions.versions['0.1'].decrypt, aKey, aValue);
					deferredResult.callback();
					
					return deferredResult;
				},
			
				'hash': function(aValue) {
					var result;
					var strngResult;
				
					stringResult = Clipperz.Crypto.Base.computeHashValue(aValue.asString());	//	!!!!!!!
					result = new Clipperz.ByteArray("0x" + stringResult);
				
					return result;
				},
				
				'deriveKey': function(aStringValue) {
					return Clipperz.Crypto.Base.computeHashValue(aStringValue);
				}
			},

		//#####################################################################

			'0.2': {
				'encrypt': function(aKey, aValue, aNonce) {
					var result;
					var	key, value;
					var dataToEncrypt;
					var encryptedData;
				
					key = Clipperz.Crypto.SHA.sha_d256(new Clipperz.ByteArray(aKey));
					value = new Clipperz.ByteArray(Clipperz.Base.serializeJSON(aValue));
					dataToEncrypt = Clipperz.Crypto.SHA.sha_d256(value).appendBlock(value);
					encryptedData = Clipperz.Crypto.AES.encrypt(key, dataToEncrypt, aNonce);
					result = encryptedData.toBase64String();
				
					return result;
				},

				'deferredEncrypt': function(aKey, aValue, aNonce) {
					var deferredResult;
					var	key, value;
					var dataToEncrypt;
//					var encryptedData;
				
					key = Clipperz.Crypto.SHA.sha_d256(new Clipperz.ByteArray(aKey));
					value = new Clipperz.ByteArray(Clipperz.Base.serializeJSON(aValue));
					dataToEncrypt = Clipperz.Crypto.SHA.sha_d256(value).appendBlock(value);
					
					deferredResult = new Clipperz.Async.Deferred("Crypto[0.2].deferredEncrypt")
					deferredResult.addCallback(Clipperz.Crypto.AES.deferredEncrypt, key, dataToEncrypt, aNonce);
					deferredResult.addCallback(function(aResult) {
						return aResult.toBase64String();
					})
					deferredResult.callback();
					
					return deferredResult;
				},
			
				'decrypt': function(aKey, aValue) {
					var result;
					
					if (aValue != null) {
						var key, value;
						var decryptedData;
						var decryptedValue;

						key = Clipperz.Crypto.SHA.sha_d256(new Clipperz.ByteArray(aKey));
						value = new Clipperz.ByteArray().appendBase64String(aValue);
				
						decryptedData = Clipperz.Crypto.AES.decrypt(key, value);
						decryptedValue = decryptedData.split((256/8));

						try {
							result = Clipperz.Base.evalJSON(decryptedValue.asString());
						} catch (exception) {
							MochiKit.Logging.logError("Error while decrypting data [1]");
							throw Clipperz.Crypto.Base.exception.CorruptedMessage;
						}
					} else {
						result = null;
					}
					
					return result;
				},

				'deferredDecrypt': function(aKey, aValue) {
					var result;

					if (aValue != null) {
						var deferredResult;
						var key, value;
//						var decryptedData;

						key = Clipperz.Crypto.SHA.sha_d256(new Clipperz.ByteArray(aKey));
						value = new Clipperz.ByteArray().appendBase64String(aValue);

						deferredResult = new Clipperz.Async.Deferred("Crypto.[0.2].deferredDecrypt");
						deferredResult.addCallback(Clipperz.Crypto.AES.deferredDecrypt, key, value);
						deferredResult.addCallback(function(aResult) {
							var result;
							var decryptedData;

							decryptedData = aResult.split((256/8));
							
							try {
								result = Clipperz.Base.evalJSON(decryptedData.asString());
							} catch (exception) {
								MochiKit.Logging.logError("Error while decrypting data [2]");
								throw Clipperz.Crypto.Base.exception.CorruptedMessage;
							}

							return result;
						})
						deferredResult.callback();
						
						result = deferredResult;
					} else {
						result = MochiKit.Async.succeed(null);
					}
					
					return result;
				},
			
				'hash': Clipperz.Crypto.SHA.sha_d256,
				
				'deriveKey': function(aStringValue) {
					var	byteData;
					var result;
					
					byteData = new Clipperz.ByteArray(aStringValue);
					result = Clipperz.Crypto.SHA.sha_d256(byteData);
					
					return result;
				}
			},

		//#####################################################################

			'0.3': {
				'encrypt': function(aKey, aValue, aNonce) {
					var result;
					var	key, value;
					var data;
					var dataToEncrypt;
					var encryptedData;
				
					key = Clipperz.Crypto.SHA.sha_d256(new Clipperz.ByteArray(aKey));
					value = Clipperz.Base.serializeJSON(aValue);
					data = new Clipperz.ByteArray(value);
					encryptedData = Clipperz.Crypto.AES.encrypt(key, data, aNonce);
					result = encryptedData.toBase64String();
				
					return result;
				},
				
				'deferredEncrypt': function(aKey, aValue, aNonce) {
					var deferredResult;
					var	key, value;
					var data;
					var dataToEncrypt;
					var encryptedData;
				
					key = Clipperz.Crypto.SHA.sha_d256(new Clipperz.ByteArray(aKey));
					value = Clipperz.Base.serializeJSON(aValue);
					data = new Clipperz.ByteArray(value);
					
					deferredResult = new Clipperz.Async.Deferred("Crypto[0.3].deferredEncrypt")
					deferredResult.addCallback(Clipperz.Crypto.AES.deferredEncrypt, key, data, aNonce);
					deferredResult.addCallback(function(aResult) {
						return aResult.toBase64String();
					})
					deferredResult.callback();
					
					return deferredResult;
				},
			
				'decrypt': function(aKey, aValue) {
					var result;
					
					if (aValue != null) {
						var key, value;
						var decryptedData;

						key = Clipperz.Crypto.SHA.sha_d256(new Clipperz.ByteArray(aKey));
						value = new Clipperz.ByteArray().appendBase64String(aValue);
				
						decryptedData = Clipperz.Crypto.AES.decrypt(key, value);

						value = decryptedData.asString();
						try {
							result = Clipperz.Base.evalJSON(value);
						} catch (exception) {
							MochiKit.Logging.logError("Error while decrypting data [3]");
							throw Clipperz.Crypto.Base.exception.CorruptedMessage;
						}
					} else {
						result = null;
					}
					
					return result;
				},
			
				'deferredDecrypt': function(aKey, aValue) {
					var deferredResult;
					
					deferredResult = new Clipperz.Async.Deferred("Crypto[0.3].deferredDecrypt", {trace: false});
//					now = new Date;
					
					if (aValue != null) {
						var key, value;
//						var decryptedData;

						key = Clipperz.Crypto.SHA.sha_d256(new Clipperz.ByteArray(aKey));
						value = new Clipperz.ByteArray().appendBase64String(aValue);

						deferredResult.addCallback(Clipperz.Crypto.AES.deferredDecrypt, key, value);
						deferredResult.addCallback(MochiKit.Async.wait, 0.1);
						deferredResult.addCallback(function(aResult) {
							return aResult.asString();
						});
						deferredResult.addCallback(MochiKit.Async.wait, 0.1);
						deferredResult.addCallback(Clipperz.Base.evalJSON);
						deferredResult.addErrback(function(anError) {
							MochiKit.Logging.logError("Error while decrypting data [4]");
							throw Clipperz.Crypto.Base.exception.CorruptedMessage;
						})
					} else {
						deferredResult.addCallback(function() {
							return null;
						});
					}
					deferredResult.callback();
					
					return deferredResult;
				},
				
				'hash': Clipperz.Crypto.SHA.sha_d256,

				'deriveKey': function(aStringValue) {
					var	byteData;
					var result;
					
					byteData = new Clipperz.ByteArray(aStringValue);
					result = Clipperz.Crypto.SHA.sha_d256(byteData);
					
					return result;
				}

			},

		//#####################################################################
/*
			'0.4': {
				'encrypt': function(aKey, aValue, aNonce) {
					var result;
					var	key, value;
					var data;
					var dataToEncrypt;
					var encryptedData;
				
//MochiKit.Logging.logDebug(">>> [" + (new Date()).valueOf() + "] Clipperz.PM.Crypto.versions[0.3].encrypt");
					key = Clipperz.Crypto.SHA.sha_d256(new Clipperz.ByteArray(aKey));
//MochiKit.Logging.logDebug("--- [" + (new Date()).valueOf() + "] Clipperz.PM.Crypto.versions[0.3].encrypt - 1");
					value = Clipperz.Base.serializeJSON(aValue);
//MochiKit.Logging.logDebug("--- [" + (new Date()).valueOf() + "] Clipperz.PM.Crypto.versions[0.3].encrypt - 2");
/ *
//MochiKit.Logging.logDebug("--> encrypt.fullSize: " + value.length);
					value = value.replace(/":{"label":"/g,		'":{l:"');
					value = value.replace(/":{"key":"/g,		'":{k:"');
					value = value.replace(/":{"notes":"/g,		'":{n:"');
					value = value.replace(/":{"record":"/g,		'":{r:"');
					value = value.replace(/", "label":"/g,		'",l:"');
					value = value.replace(/", "favicon":"/g,	'",f:"');
//MochiKit.Logging.logDebug("<-- encrypt.compressed: " + value.length);
* /
					data = new Clipperz.ByteArray(value);
//MochiKit.Logging.logDebug("--- [" + (new Date()).valueOf() + "] Clipperz.PM.Crypto.versions[0.3].encrypt - 3");
					encryptedData = Clipperz.Crypto.AES.encrypt(key, data, aNonce);
//MochiKit.Logging.logDebug("--- [" + (new Date()).valueOf() + "] Clipperz.PM.Crypto.versions[0.3].encrypt - 4");
					result = encryptedData.toBase64String();
//MochiKit.Logging.logDebug("<<< [" + (new Date()).valueOf() + "] Clipperz.PM.Crypto.versions[0.3].encrypt");
				
					return result;
				},
			
				'decrypt': function(aKey, aValue) {
					var result;
					
					if (aValue != null) {
						var key, value;
						var decryptedData;

						key = Clipperz.Crypto.SHA.sha_d256(new Clipperz.ByteArray(aKey));
						value = new Clipperz.ByteArray().appendBase64String(aValue);
				
						decryptedData = Clipperz.Crypto.AES.decrypt(key, value);

						value = decryptedData.asString();
/ *
						value = value.replace(/":{l:"/g,	'":{"label":"');
						value = value.replace(/":{k:"/g,	'":{"key":"');
						value = value.replace(/":{n:"/g,	'":{"notes":"');
						value = value.replace(/":{r:"/g,	'":{"record":"');
						value = value.replace(/",l:"/g,		'", "label":"');
						value = value.replace(/",f:"/g,		'", "favicon":"');
* /
						try {
							result = Clipperz.Base.evalJSON(value);
						} catch (exception) {
							MochiKit.Logging.logError("Error while decrypting data");
							throw Clipperz.Crypto.Base.exception.CorruptedMessage;
						}
						
						
					} else {
						result = null;
					}
					
					return result;
				},
			
				'hash': Clipperz.Crypto.SHA.sha_d256
			},
*/
		//#####################################################################
			__syntaxFix__: "syntax fix"
		}
	},
	
	//-------------------------------------------------------------------------
	
	'encrypt': function(aKey, aValue, aVersion) {
		return Clipperz.PM.Crypto.encryptingFunctions.versions[aVersion].encrypt(aKey, aValue);
	},

	'deferredEncrypt': function(someParameters) {
		return Clipperz.PM.Crypto.encryptingFunctions.versions[someParameters['version']].deferredEncrypt(someParameters['key'], someParameters['value']);
	},

	//.........................................................................

	'decrypt': function(aKey, aValue, aVersion) {
		return Clipperz.PM.Crypto.encryptingFunctions.versions[aVersion].decrypt(aKey, aValue);
	},

	'deferredDecrypt': function(someParameters) {
		return Clipperz.PM.Crypto.encryptingFunctions.versions[someParameters['version']].deferredDecrypt(someParameters['key'], someParameters['value']);
	},

	//-------------------------------------------------------------------------

	'hash': function(aValue) {
		return Clipperz.PM.Crypto.encryptingFunctions.versions[Clipperz.PM.Crypto.encryptingFunctions.currentVersion]['hash'](aValue);
	},
	
	//-------------------------------------------------------------------------

	'randomKey': function() {
		return Clipperz.Crypto.PRNG.defaultRandomGenerator().getRandomBytes(32).toHexString().substring(2);
	},

	//-------------------------------------------------------------------------

	'deriveKey': function(aValue) {
		return Clipperz.PM.Crypto.encryptingFunctions.versions[Clipperz.PM.Crypto.encryptingFunctions.currentVersion].deriveKey(aValue);
	},
	
	//-------------------------------------------------------------------------

	'passwordEntropy': function(aValue) {
		var result;
		var	bitPerChar;
		
		bitPerChar = 4;
		if (/[a-z]/.test(aValue)) {
			bitPerChar ++;
		}
		if (/[A-Z]/.test(aValue)) {
			bitPerChar ++;
		}
		if (/[^a-zA-Z0-9]/.test(aValue)) {
			bitPerChar ++;
		}

		result = aValue.length * bitPerChar;
		
		return result;
	},
	
	//-------------------------------------------------------------------------

	'nullValue': '####',

	//-------------------------------------------------------------------------
	__syntaxFix__: "syntax fix"

});

//*****************************************************************************

//MochiKit.Base.update(Clipperz.PM.Connection.communicationProtocol.versions, {
//	'current': Clipperz.PM.Connection.communicationProtocol.versions[Clipperz.PM.Connection.communicationProtocol.currentVersion]
//});

MochiKit.Base.update(Clipperz.PM.Crypto.encryptingFunctions.versions, {
	'current': Clipperz.PM.Crypto.encryptingFunctions.versions[Clipperz.PM.Crypto.encryptingFunctions.currentVersion]
});

//*****************************************************************************