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/** * Crypto * * An abstraction layer to instanciate our crypto algorithms * Copyright (c) 2007 Henri Torgemane * * See LICENSE.txt for full license information. */ package com.hurlant.crypto { import com.hurlant.crypto.hash.HMAC; import com.hurlant.crypto.hash.MAC; import com.hurlant.crypto.hash.IHash; import com.hurlant.crypto.hash.MD2; import com.hurlant.crypto.hash.MD5; import com.hurlant.crypto.hash.SHA1; import com.hurlant.crypto.hash.SHA224; import com.hurlant.crypto.hash.SHA256; import com.hurlant.crypto.prng.ARC4; import com.hurlant.crypto.rsa.RSAKey; import com.hurlant.crypto.symmetric.AESKey; import com.hurlant.crypto.symmetric.BlowFishKey; import com.hurlant.crypto.symmetric.CBCMode; import com.hurlant.crypto.symmetric.CFB8Mode; import com.hurlant.crypto.symmetric.CFBMode; import com.hurlant.crypto.symmetric.CTRMode; import com.hurlant.crypto.symmetric.DESKey; import com.hurlant.crypto.symmetric.ECBMode; import com.hurlant.crypto.symmetric.ICipher; import com.hurlant.crypto.symmetric.IMode; import com.hurlant.crypto.symmetric.IPad; import com.hurlant.crypto.symmetric.ISymmetricKey; import com.hurlant.crypto.symmetric.IVMode; import com.hurlant.crypto.symmetric.NullPad; import com.hurlant.crypto.symmetric.OFBMode; import com.hurlant.crypto.symmetric.PKCS5; import com.hurlant.crypto.symmetric.SimpleIVMode; import com.hurlant.crypto.symmetric.TripleDESKey; import com.hurlant.crypto.symmetric.XTeaKey; import com.hurlant.util.Base64; import flash.utils.ByteArray; /** * A class to make it easy to use the rest of the framework. * As a side-effect, using this class will cause most of the framework * to be linked into your application, which is not always what you want. * * If you want to optimize your download size, don't use this class. * (But feel free to read it to get ideas on how to get the algorithm you want.) */ public class Crypto { private var b64:Base64; // we don't use it, but we want the swc to include it, so cheap trick. public function Crypto(){ } /** * Things that should work, among others: * "aes" * "aes-128-ecb" * "aes-128-cbc" * "aes-128-cfb" * "aes-128-cfb8" * "aes-128-ofb" * "aes-192-cfb" * "aes-256-ofb" * "blowfish-cbc" * "des-ecb" * "xtea" * "xtea-ecb" * "xtea-cbc" * "xtea-cfb" * "xtea-cfb8" * "xtea-ofb" * "rc4" * "simple-aes-cbc" */ public static function getCipher(name:String, key:ByteArray, pad:IPad=null):ICipher { // split name into an array. var keys:Array = name.split("-"); switch (keys[0]) { /** * "simple" is a special case. It means: * "If using an IV mode, prepend the IV to the ciphertext" */ case "simple": keys.shift(); name = keys.join("-"); var cipher:ICipher = getCipher(name, key, pad); if (cipher is IVMode) { return new SimpleIVMode(cipher as IVMode); } else { return cipher; } /** * we support both "aes-128" and "aes128" * Technically, you could use "aes192-128", but you'd * only be hurting yourself. */ case "aes": case "aes128": case "aes192": case "aes256": keys.shift(); if (key.length*8==keys[0]) { // support for "aes-128-..." and such. keys.shift(); } return getMode(keys[0], new AESKey(key), pad); break; case "bf": case "blowfish": keys.shift(); return getMode(keys[0], new BlowFishKey(key), pad); /** * des-ede and des-ede3 are both equivalent to des3. * the choice between 2tdes and 3tdes is made based * on the length of the key provided. */ case "des": keys.shift(); if (keys[0]!="ede" && keys[0]!="ede3") { return getMode(keys[0], new DESKey(key), pad); } if (keys.length==1) { keys.push("ecb"); // default mode for 2tdes and 3tdes with openssl enc } // fall-through to triple des case "3des": case "des3": keys.shift(); return getMode(keys[0], new TripleDESKey(key), pad); case "xtea": keys.shift(); return getMode(keys[0], new XTeaKey(key), pad); break; /** * Technically, you could say "rc4-128" or whatever, * but really, the length of the key is what counts here. */ case "rc4": keys.shift(); return new ARC4(key); break; } return null; } /** * Returns the size of a key for a given cipher identifier. */ public static function getKeySize(name:String):uint { var keys:Array = name.split("-"); switch (keys[0]) { case "simple": keys.shift(); return getKeySize(keys.join("-")); case "aes128": return 16; case "aes192": return 24; case "aes256": return 32; case "aes": keys.shift(); return parseInt(keys[0])/8; case "bf": case "blowfish": return 16; case "des": keys.shift(); switch (keys[0]) { case "ede": return 16; case "ede3": return 24; default: return 8; } case "3des": case "des3": return 24; case "xtea": return 8; case "rc4": if (parseInt(keys[1])>0) { return parseInt(keys[1])/8; } return 16; // why not. } return 0; // unknown; } private static function getMode(name:String, alg:ISymmetricKey, padding:IPad=null):IMode { switch (name) { case "ecb": return new ECBMode(alg, padding); case "cfb": return new CFBMode(alg, padding); case "cfb8": return new CFB8Mode(alg, padding); case "ofb": return new OFBMode(alg, padding); case "ctr": return new CTRMode(alg, padding); case "cbc": default: return new CBCMode(alg, padding); } } /** * Things that should work: * "md5" * "sha" * "sha1" * "sha224" * "sha256" */ public static function getHash(name:String):IHash { switch(name) { case "md2": return new MD2; case "md5": return new MD5; case "sha": // let's hope you didn't mean sha-0 case "sha1": return new SHA1; case "sha224": return new SHA224; case "sha256": return new SHA256; } return null; } /** * Things that should work: * "sha1" * "md5-64" * "hmac-md5-96" * "hmac-sha1-128" * "hmac-sha256-192" * etc. */ public static function getHMAC(name:String):HMAC { var keys:Array = name.split("-"); if (keys[0]=="hmac") keys.shift(); var bits:uint = 0; if (keys.length>1) { bits = parseInt(keys[1]); } return new HMAC(getHash(keys[0]), bits); } public static function getMAC(name:String):MAC { var keys:Array = name.split("-"); if (keys[0]=="mac") keys.shift(); var bits:uint = 0; if (keys.length > 1) { bits = parseInt(keys[1]); } return new MAC(getHash(keys[0]), bits); } public static function getPad(name:String):IPad { switch(name) { case "null": return new NullPad; case "pkcs5": default: return new PKCS5; } } /** mostly useless. */ public static function getRSA(E:String, M:String):RSAKey { return RSAKey.parsePublicKey(M,E); } } }