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POEncryption method for iPhone and Android
 

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  1. POEncryption method for iPhone and Android
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    <p>I have tried to generate an encrypted text using AES algorithm In both ( Android and IPhone ) platforms but the problem is even we use the same encryption decryption library (AES-128) and with the same fixed variables ( Key , IV ,mode) but I get two different result for them.</p> <p>I appreciate any help . :(</p> <p>The below code presents the used encryption and decryption methods ,</p> <p><strong>Code version for Android:</strong></p> <ul> <li>Key = “123456789abcdefg” ; <ul> <li>IV = “1111111111111111” ;</li> <li>Plain text = “HelloThere”;</li> <li>Mode = “AES/CBC/NoPadding” ;</li> </ul></li> </ul> <p>Code :</p> <pre><code> public class Crypto { public static String encrypt(String seed, String cleartext) throws Exception { byte[] rawKey = getRawKey(seed.getBytes()); byte[] result = encrypt(rawKey, cleartext.getBytes()); return toHex(result); } public static String decrypt(String seed, String encrypted) throws Exception { byte[] rawKey = getRawKey(seed.getBytes()); byte[] enc = toByte(encrypted); byte[] result = decrypt(rawKey, enc); return new String(result); } private static byte[] getRawKey(byte[] seed) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance(“CBC”); SecureRandom sr = SecureRandom.getInstance(“SHA1PRNG”); sr.setSeed(seed); kgen.init(128, sr); // 192 and 256 bits may not be available SecretKey skey = kgen.generateKey(); byte[] raw = skey.getEncoded(); return raw; } private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”); Cipher cipher = Cipher.getInstance(“AES”); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte[] encrypted = cipher.doFinal(clear); return encrypted; } private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, “AES”); Cipher cipher = Cipher.getInstance(“AES”); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] decrypted = cipher.doFinal(encrypted); return decrypted; } public static String toHex(String txt) { return toHex(txt.getBytes()); } public static String fromHex(String hex) { return new String(toByte(hex)); } public static byte[] toByte(String hexString) { int len = hexString.length()/2; byte[] result = new byte[len]; for (int i = 0; i &lt; len; i++) result[i] = Integer.valueOf(hexString.substring(2*i, 2*i+2), 16).byteValue(); return result; } public static String toHex(byte[] buf) { if (buf == null) return “”; StringBuffer result = new StringBuffer(2*buf.length); for (int i = 0; i &lt; buf.length; i++) { appendHex(result, buf[i]); } return result.toString(); } private final static String HEX = “0123456789ABCDEF”; private static void appendHex(StringBuffer sb, byte b) { sb.append(HEX.charAt((b»4)&amp;0x0f)).append(HEX.charAt(b&amp;0x0f)); } </code></pre> <p>}</p> <p><strong>Code version for IPhone:</strong></p> <pre><code>- (NSData *) transform:(CCOperation) encryptOrDecrypt data:(NSData *) inputData { NSData* secretKey = [Cipher md5:cipherKey]; CCCryptorRef cryptor = NULL; CCCryptorStatus status = kCCSuccess; uint8_t iv[kCCBlockSizeAES128]; memset((void *) iv, 0x0, (size_t) sizeof(iv)); status = CCCryptorCreate(encryptOrDecrypt, kCCAlgorithmAES128, kCCOptionPKCS7Padding, [secretKey bytes], kCCKeySizeAES128, iv, &amp;cryptor); if (status != kCCSuccess) { return nil; } size_t bufsize = CCCryptorGetOutputLength(cryptor, (size_t)[inputData length], true); void * buf = malloc(bufsize * sizeof(uint8_t)); memset(buf, 0x0, bufsize); size_t bufused = 0; size_t bytesTotal = 0; status = CCCryptorUpdate(cryptor, [inputData bytes], (size_t)[inputData length], buf, bufsize, &amp;bufused); if (status != kCCSuccess) { free(buf); CCCryptorRelease(cryptor); return nil; } bytesTotal += bufused; status = CCCryptorFinal(cryptor, buf + bufused, bufsize - bufused, &amp;bufused); if (status != kCCSuccess) { free(buf); CCCryptorRelease(cryptor); return nil; } bytesTotal += bufused; CCCryptorRelease(cryptor); return [NSData dataWithBytesNoCopy:buf length:bytesTotal]; </code></pre> <p>}</p> <pre><code> + (NSData *) md5:(NSString *) stringToHash { const char *src = [stringToHash UTF8String]; unsigned char result[CC_MD5_DIGEST_LENGTH]; CC_MD5(src, strlen(src), result); return [NSData dataWithBytes:result length:CC_MD5_DIGEST_LENGTH]; </code></pre> <p>}</p> <p><strong>Some of my references :</strong></p> <ul> <li><p><a href="http://automagical.rationalmind.net/2009/02/12/aes-interoperability-between-net-and-iphone/" rel="nofollow">http://automagical.rationalmind.net/2009/02/12/aes-interoperability-between-net-and-iphone/</a></p></li> <li><p><a href="http://code.google.com/p/aes-encryption-samples/wiki/HowToEncryptWithJava" rel="nofollow">http://code.google.com/p/aes-encryption-samples/wiki/HowToEncryptWithJava</a></p></li> </ul>
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    1. COPlease keep in mind that getBytes() method of string is not sure to return same String every time
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    2. COHave you tried decrypting the output of your Java and Objective-C versions through this? http://www.everpassword.com/aes-encryptor
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    3. COhave you tried the basic plaintext.equals(decrypt(encrypt(plaintext))) test? do they return true for both methods?
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