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(C#) HMAC Hex String

Demonstrates how to compute an HMAC using a hexidecimal key and data.

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Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

bool success = crypt.UnlockComponent("Anything for 30-day trial");
if (success != true) {
    Debug.WriteLine(crypt.LastErrorText);
    return;
}

//  Set the MAC algorithm to HMAC
crypt.MacAlgorithm = "hmac";

//  Our HMAC key will be the bytes represented in the following hex string.
//  In other words, the HMAC key is composed of the bytes 0x41, 0xC2, 0x1C, ...
//  (It is not composed of the us-ascii string '4', '1', 'C', ...)
string keyHex = "41C21CB9D7A02FC5D4FADB9E4755B9DE";
success = crypt.SetMacKeyEncoded(keyHex,"hex");

//  Our desire is to HMAC the bytes represented in the following string:
string dataHex = "C22078065B01460001000000010062043BF5B18228C8E02D17BCFE4E00561FA6DEC216EA97195CEB579942E275C21932258E3CD391E507FF4E7FD4C787A8447DA111C54A9C1795E7FF4C0BAA2EDA";

//  We'll need to decode the hex to binary:
Chilkat.BinData bd = new Chilkat.BinData();
bd.AppendEncoded(dataHex,"hex");

//  Do the HMAC-SHA256 hash and return as a hex string:
crypt.EncodingMode = "hex";
crypt.HashAlgorithm = "sha-256";
string macHex = crypt.MacBdENC(bd);
Debug.WriteLine(macHex);

 

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