C#

HMAC SHA-1 Matching FIPS Examples

See more Encryption Examples

Provides an example of computing an HMAC-SHA1 digest to duplicate the FIPS examples at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf C#

// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

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

string strToSign = "Sample #1";

// 64-byte key
string key = "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f";

// The expected result:
// (from Appendix A.1 at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf )
string expectedResult = "4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a";

// Here is the code to duplicate the results:
crypt.HashAlgorithm = "sha-1";
crypt.EncodingMode = "hex";
crypt.MacAlgorithm = "hmac";

crypt.SetMacKeyEncoded(key,"hex");

string mac;
mac = crypt.MacStringENC(strToSign);

Debug.WriteLine("Computed: " + mac);
Debug.WriteLine("Expected: " + expectedResult);