用C#用HMAC-MD5签名字符串

时间:2012-09-13 22:03:58

标签: security c#-4.0 hmac

我得到了以下HMAC密钥(十六进制格式):

52320e181a481f5e19507a75b3cae4d74d5cfbc328f7f2b738e9fb06b2e05b55b632c1c3d331dcf3baacae8d3000594f839d770f2080910b52b7b8beb3458c08

我需要在此字符串上签名:

1100002842850CHF91827364

结果应该是这个(十六进制格式):

2ad2f79111afd818c1dc0916d824b0a1

我有以下代码:

string key = "52320e181a481f5e19507a75b3cae4d74d5cfbc328f7f2b738e9fb06b2e05b55b632c1c3d331dcf3baacae8d3000594f839d770f2080910b52b7b8beb3458c08";
string payload = "1100002842850CHF91827364";

byte[] keyInBytes = Encoding.UTF8.GetBytes(key);
byte[] payloadInBytes = Encoding.UTF8.GetBytes(payload);

var md5 = new HMACMD5(keyInBytes);
byte[] hash = md5.ComputeHash(payloadInBytes);

var result = BitConverter.ToString(hash).Replace("-", string.Empty);

但是,我没有得到结果。我做错了什么?

2 个答案:

答案 0 :(得分:9)

使用密钥HMAC md5进行散列时

        var data = Encoding.UTF8.GetBytes(plaintext);
        // key
        var key = Encoding.UTF8.GetBytes(transactionKey);

        // Create HMAC-MD5 Algorithm;
        var hmac = new HMACMD5(key);

        // Compute hash.
        var hashBytes = hmac.ComputeHash(data);

        // Convert to HEX string.
        return System.BitConverter.ToString(hashBytes).Replace("-", "").ToLower();

答案 1 :(得分:4)

而不是这样做:

byte[] keyInBytes = Encoding.UTF8.GetBytes(key);

您需要将密钥从十六进制字符串转换为字节数组。在这里你可以找到例子:

How do you convert Byte Array to Hexadecimal String, and vice versa?