object-c and C# 3DES Encryption with different output

Question

I have the following problem I would like to send my string encrqpted to my webservice and decrypt it there. But i got different output when I encrypt with object-c can somebody tell me what i'm doing wrong?

My encryption with object-c:

+ (NSString*)encryptData:(NSData*)inputData 
{
    NSData * key = [@"FeljWsN+uaEB9+jqDnPRQeIi" dataUsingEncoding:NSUTF8StringEncoding];

    NSMutableData* outputData = [NSMutableData dataWithLength:(inputData.length + kCCBlockSize3DES)];

    size_t outLength;

    CCCryptorStatus result = CCCrypt(kCCEncrypt,                // CCOperation op
                                     kCCAlgorithm3DES,          // CCAlgorithm alg
                                     kCCOptionPKCS7Padding,     // CCOptions options
                                     key.bytes,                 // const void *key
                                     key.length,                // size_t keyLength
                                     nil,                       // const void *iv
                                     inputData.bytes,           // const void *dataIn
                                     inputData.length,          // size_t dataInLength
                                     outputData.mutableBytes,   // void *dataOut
                                     outputData.length,         // size_t dataOutAvailable
                                     &outLength);               // size_t *dataOutMoved

    if (result != kCCSuccess)
        return nil;

    [outputData setLength:outLength];
    NSString * outputString = [outputData base64EncodingWithLineLength:0];
    return outputString;
}

My encryption with C#:

public string Encrypt(string toEncrypt)
{
    string retValue = "";

    try
    {
        byte[] keyArray;
        byte[] toEncryptArray = UTF8Encoding.UTF8.GetBytes(toEncrypt);

        keyArray = UTF8Encoding.UTF8.GetBytes("FeljWsN+uaEB9+jqDnPRQeIi");

        TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
        tdes.Key = keyArray;
        tdes.Mode = CipherMode.ECB;
        tdes.Padding = PaddingMode.PKCS7;

        ICryptoTransform cTransform = tdes.CreateEncryptor();
        byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

        retValue = Convert.ToBase64String(resultArray, 0, resultArray.Length);
    }
    catch 
    {
    }

    return retValue;
}

Object-c:

NSData * _secretData = [@"Christiaan" dataUsingEncoding:NSUTF8StringEncoding];
NSString * encryptedString = [TripleDES encryptData: _secretData];

gives me "Lp3x2fm2jrK1ftsHoZN9cg==" and C#

Encryption encryptionSet = new Encryption();
string encryptedString = encryptionSet.Encrypt("Christiaan");

gives me "Lp3x2fm2jrJ7ghY9SXRlUw=="

Answer 1

needed to add "| kCCOptionECBMode" behind the kCCOptionPKCS7Padding:

CCCryptorStatus result = CCCrypt(kCCEncrypt,                // CCOperation op
                                kCCAlgorithm3DES,           // CCAlgorithm alg
                                kCCOptionPKCS7Padding | kCCOptionECBMode, // CCOptions options
                                key.bytes,                 // const void *key
                                key.length,                // size_t keyLength
                                nil,                       // const void *iv
                                inputData.bytes,           // const void *dataIn
                                inputData.length,          // size_t dataInLength
                                outputData.mutableBytes,   // void *dataOut
                                outputData.length,         // size_t dataOutAvailable
                                &outLength);               // size_t *dataOutMoved

_{Note: this was extracted from the question and posted here on the OP's behalf.}