我想创建一个Android MD5哈希字符串等于C＃code波纹管：

I am trying to create an android MD5 hash string to equal the C# code bellow:

private string CalculateHMACMd5(string message, string key)
{
     System.Text.ASCIIEncoding encoding = new System.Text.ASCIIEncoding();
     byte[] keyByte = encoding.GetBytes(key);
     HMACMD5 hmacmd5 = new HMACMD5(keyByte);
     byte[] messageBytes = encoding.GetBytes(message);
     byte[] hashmessage = hmacmd5.ComputeHash(messageBytes);
     string HMACMd5Value = ByteToString(hashmessage);
     return HMACMd5Value;
}

private static string ByteToString(byte[] buff)
{
    string sbinary = "";
    for (int i = 0; i < buff.Length; i++)
    {
        sbinary += buff[i].ToString("X2"); 
    }
    return (sbinary);
}

安卓code，我目前使用[ 不产生相同的C＃code 的]：

Android code that I currently use [not generating the same C# code]:

        public static String sStringToHMACMD5(String sData, String sKey) 
        {
            SecretKeySpec key;
            byte[] bytes;
            String sEncodedString = null;
            try 
            {       
                key = new SecretKeySpec((sKey).getBytes(), "ASCII");
                Mac mac = Mac.getInstance("HMACMD5");
                mac.init(key);
                mac.update(sData.getBytes());

                bytes = mac.doFinal(sData.getBytes());
                StringBuffer hash = new StringBuffer();

                for (int i=0; i<bytes.length; i++) {
                    String hex = Integer.toHexString(0xFF &  bytes[i]);
                    if (hex.length() == 1) {
                        hash.append('0');
                    }
                    hash.append(hex);
                }
            sEncodedString = hash.      
            return sEncodedString;
        }

在此先感谢。

Thanks in advance.

推荐答案

定义不工作。例外？产量不如预期？等等。

Define 'not working'. Exception? Output not as expected?, etc.

一个明显的一点是，你是处理相同的数据两次：

One obvious thing is that you are processing the same data twice:

mac.update(sData.getBytes());
bytes = mac.doFinal(sData.getBytes());

要处理所有的数据在一通，只需要使用 doFinal（）（假设它不是太大）。 另一件事，可能是错是关键的格式：是什么的字符串SKEY 的格式。理想情况下，你应该使用base64连接codeD字符串，而不是调用的getString（）。

To process all data in one pass, just use doFinal() (assuming it's not too big). Another thing that can be wrong is the format of the key: what is the format of String sKey. Ideally you should be using a BASE64 encoded string, not calls to getString().