Question

I really really…. really need help………..

-UPDATED-

I need help because my java function gives me a different result compared with the iOS 3DES function. I posted the code from both ios and java; and results when specified plaintext is “tutor.1” and MD5 key is “spO13+QLZCRAe93pIXMXLg==” (MD5, clearly, is the same for both).

JAVA 3DES (short and simple)

public static String encrypt(String plaintext, String enctoken){

    if(enctoken == null)
        enctoken = "sfdjf48mdfdf3054";

    String encrypted = null; 

    byte[] plaintextByte = EncodingUtils.getBytes(plaintext,"UTF-8");

    byte[] hash = Connessione.md5(enctoken);

    Log.i("ENCRYPT", "MD5: "+Base64.encodeToString(hash, 0));

    try {
        Cipher cipher = Cipher.getInstance("DESEDE/ECB/PKCS5Padding");
        SecretKeySpec myKey = new SecretKeySpec(hash,"DESede");

        cipher.init(Cipher.ENCRYPT_MODE, myKey); 

        try {
            byte[] encryptedPlainText = cipher.doFinal(plaintextByte);

            encrypted = Base64.encodeToString(encryptedPlainText, 0);

            Log.i("ENCRYPT", "Pwd encrypted: "+encrypted);

            return encrypted;

        } catch (IllegalBlockSizeException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        } catch (BadPaddingException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    } catch (NoSuchAlgorithmException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (NoSuchPaddingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    } catch (InvalidKeyException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }       

    return "";
}

result: R4mXAaHcFxM=

IOS 3DES – UPDATED AGAIN

// key value in parameters is MD5 value! It is the same for both version

+ (NSString *) encrypt:(NSString *) dataToEncrypt withKey:(NSString*) key{    


NSData *data = [dataToEncrypt dataUsingEncoding:NSUTF8StringEncoding];
NSData *mData = [key dataUsingEncoding:NSUTF8StringEncoding];

CCCryptorStatus ccStatus = kCCSuccess;


// Begin to calculate bytesNeeded....
size_t bytesNeeded = 0;

ccStatus = CCCrypt(kCCEncrypt,
                   kCCAlgorithm3DES,
                   kCCOptionECBMode | kCCOptionPKCS7Padding,
                   [mData bytes],
                   [mData length],
                   nil,
                   [data bytes],
                   [data length],
                   NULL,
                   0,
                   &bytesNeeded);

if(kCCBufferTooSmall != ccStatus){

    NSLog(@"Here it must return BUFFER TOO SMALL !!");
    return nil;
}

// .....End
// Now i do the real Crypting

char* cypherBytes = malloc(bytesNeeded);
size_t bufferLength = bytesNeeded;

if(NULL == cypherBytes)
    NSLog(@"cypherBytes NULL");

ccStatus = CCCrypt(kCCEncrypt,
                   kCCAlgorithm3DES,
                   kCCOptionECBMode | kCCOptionPKCS7Padding,
                   [mData bytes],
                   [mData length],
                   nil,
                   [data bytes],
                   [data length],
                   cypherBytes,
                   bufferLength,
                   &bytesNeeded);

if(kCCSuccess != ccStatus){
    NSLog(@"kCCSuccess NO!");
    return nil;
}

return [Base64 encode:[NSData dataWithBytes:cypherBytes length:bufferLength]]; 

}

result: YBAva5J2khY=

I need iOS version returns same result as the Java version.

I found the Base64 class here: http://www.imthi.com/blog/programming/iphone-sdk-base64-encode-decode.php

What i’m doing wrong ?

Thx for your help and time

Answer 1

Error found. keydata encoding was different