问题
I got the following HMAC key (in hexadecimal format):
52320e181a481f5e19507a75b3cae4d74d5cfbc328f7f2b738e9fb06b2e05b55b632c1c3d331dcf3baacae8d3000594f839d770f2080910b52b7b8beb3458c08
I need to sign this string:
1100002842850CHF91827364
The result should be this (in hexadecimal format):
2ad2f79111afd818c1dc0916d824b0a1
I have the following code:
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);
However, I am not getting the result. What am I doing wrong?
回答1:
Instead of doing this:
byte[] keyInBytes = Encoding.UTF8.GetBytes(key);
you need to convert key from a hex string to array of bytes. Here you can find example:
How do you convert Byte Array to Hexadecimal String, and vice versa?
回答2:
when hashing with key HMAC md5
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();
来源:https://stackoverflow.com/questions/12415438/signing-a-string-with-hmac-md5-with-c-sharp