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    <p>Ok, I started off easier, using DES encryption. Also, I'm skipping the Base64 and the hashing on the key - all of these are easily added once you're sure that the encryption is working properly, and they can be added one at a time.</p> <p>Here's the iOS code:</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import &lt;CommonCrypto/CommonCrypto.h&gt; #import &lt;CommonCrypto/CommonCryptor.h&gt; int main(int argc, char *argv[]) { @autoreleasepool { BOOL encryptOrDecrypt = kCCEncrypt; NSString *plainText = @"abcdefghijklmnop"; NSString *key = @"01234567"; const void *vplainText; size_t plainTextBufferSize; NSData *tempData = [plainText dataUsingEncoding:NSASCIIStringEncoding]; plainTextBufferSize = [tempData length]; vplainText = [tempData bytes]; CCCryptorStatus ccStatus; uint8_t *bufferPtr = NULL; size_t bufferPtrSize = 0; size_t movedBytes = 0; bufferPtrSize = [plainText length]; if (bufferPtrSize % 8) { bufferPtrSize += 8 - (bufferPtrSize % 8); } // bufferPtrSize = (plainTextBufferSize + kCCBlockSize3DES) &amp; ~(kCCBlockSize3DES - 1); bufferPtr = malloc( bufferPtrSize * sizeof(uint8_t) + 1); // To null-terminate a string if req'd memset((void *)bufferPtr, 0x0, bufferPtrSize+1); NSData *_keyData = [key dataUsingEncoding:NSASCIIStringEncoding]; NSLog(@"key byte is %s", [_keyData bytes]); // Initialization vector; dummy in this case 0's. // uint8_t iv[kCCBlockSize3DES]; // memset((void *) iv, 0x0, (size_t) sizeof(iv)); ccStatus = CCCrypt(encryptOrDecrypt, kCCAlgorithmDES, kCCOptionECBMode, //kCCOptionPKCS7Padding | kCCOptionECBMode, (const void *)[_keyData bytes], //key kCCKeySizeDES, nil, //iv, vplainText, //plainText, plainTextBufferSize, (void *)bufferPtr, bufferPtrSize, &amp;movedBytes); //if (ccStatus == kCCSuccess) NSLog(@"SUCCESS"); /*else*/ switch (ccStatus) { case kCCParamError: NSLog(@"PARAM ERROR"); break; case kCCBufferTooSmall: NSLog(@"BUFFER TOO SMALL"); break; case kCCMemoryFailure: NSLog(@"MEMORY FAILURE"); break; case kCCAlignmentError: NSLog(@"ALIGNMENT ERROR"); break; case kCCDecodeError: NSLog(@"DECODE ERROR"); break; case kCCUnimplemented: NSLog(@"UNIMPLEMENTED"); break; default: NSLog(@"encrypt seems to have worked"); break; } for (size_t i=0; i&lt;movedBytes; i++) { printf("%02x ", (int) bufferPtr[i]); } printf("\n"); return UIApplicationMain(argc, argv, nil, NSStringFromClass([FAAppDelegate class])); } } </code></pre> <p>And here's the Java code:</p> <pre><code>import java.io.UnsupportedEncodingException; import java.security.InvalidKeyException; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.Arrays; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.KeyGenerator; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; import javax.crypto.spec.IvParameterSpec; import javax.crypto.spec.SecretKeySpec; import javax.xml.bind.DatatypeConverter; public class DesRun { /** * @param args */ public static void main(String[] args) { String theKey = "01234567"; String message = "abcdefghijklmnop"; Cipher ecipher, dcipher; try { // generate secret key using DES algorithm SecretKeySpec key = new SecretKeySpec(theKey.getBytes("UTF-8"), "DES"); ecipher = Cipher.getInstance("DES"); dcipher = Cipher.getInstance("DES"); // initialize the ciphers with the given key ecipher.init(Cipher.ENCRYPT_MODE, key); dcipher.init(Cipher.DECRYPT_MODE, key); byte[] encrypted = ecipher.doFinal(message.getBytes("UTF-8")); System.out.println(DatatypeConverter.printHexBinary(encrypted)); String decrypted = new String(dcipher.doFinal(encrypted), "UTF-8"); System.out.println("Decrypted: " + decrypted); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } } </code></pre> <p>Both print out the hex bytes of the encrypted data, and they agree.</p> <p>Now it should be (relatively) easy to move to 3DES.</p> <p>Only once you've got 3DES agreeing on both iOS and Java would I start to add hashing on the keys.</p>
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    1. PO3DES result in Java produces different result from 3DES iOS version
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    1. COUnfortunally, encrypt length is always too short. I expect my method returns an encrypted string with length = 56, not 12. Maybe is not possible by this Cypher library ?
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    2. COI solved size result problem (switch from NSUTF8StringEncoding to NSUTF32StringEncoding). I tried your solution specifying 3des, but results are different unfortunally....
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