在C＃中获取SHA256并加密AES128（ECB），在Objective-C中也需要它

Question

在C＃项目中，将为GET请求生成一个字符串，生成一个SHA256哈希并使用以下代码使用AES128进行加密：

            SHA256 mySHA256 = SHA256Managed.Create();
            byte[] keyHash = mySHA256.ComputeHash(Encoding.ASCII.GetBytes(key));
            byte[] keyHash128 = new byte[16];
            Array.Copy(keyHash, keyHash128, 16);

            Aes encryptor = Aes.Create();

            encryptor.Mode = CipherMode.ECB;
            encryptor.Key = keyHash128;

            MemoryStream memoryStream = new MemoryStream();
            ICryptoTransform aesEncryptor = encryptor.CreateEncryptor();
            CryptoStream cryptoStream = new CryptoStream(memoryStream, aesEncryptor, CryptoStreamMode.Write);

            byte[] plainBytes = UTF8Encoding.UTF8.GetBytes(data);
            cryptoStream.Write(plainBytes, 0, plainBytes.Length);
            cryptoStream.FlushFinalBlock();
            byte[] cipherBytes = memoryStream.ToArray();
            memoryStream.Close();
            cryptoStream.Close();

            string cipherText = System.Convert.ToBase64String(cipherBytes, 0, cipherBytes.Length);
            return cipherText;

我需要在Objective-C代码中进行相同的操作。我的C代码为Objective-C代码生成输入字符串（与C＃相同）。但是结果是不同的。这是我的Objective-C代码：

    // const char *key - input key
    // const char *content - input data
    unsigned char result[CC_SHA256_DIGEST_LENGTH];
    CC_SHA256(key, strlen(key), result);

    NSData* outData = [NSData dataWithBytes:result length:16];
NSData* contentData = [NSData dataWithBytes:content length:strlen(content)];
    size_t operationSize = outData.length + kCCBlockSizeAES128;
    void *operationBytes = malloc(operationSize);
    if (operationBytes == NULL) {
            return nil;
    }
    size_t actualOutSize = 0;

    CCCryptorStatus cryptStatus = CCCrypt(kCCEncrypt,
                kCCAlgorithmAES128,
                kCCOptionECBMode,
                outData.bytes,
                kCCKeySizeAES128,
                NULL,
                contentData.bytes, contentData.length,
                operationBytes,operationSize,&actualOutSize);
    if (cryptStatus == kCCSuccess) {
            decryptedData = [NSData dataWithBytesNoCopy:operationBytes length:actualOutSize];
        }

结果不同。我知道问题出在我的Obj-C代码中，但我不知道在哪里。也许有人可以帮我吗？