VB.NET

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 VB.NET

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

Dim crypt As New Chilkat.Crypt2

Dim strToSign As String = "Sample #1"

' 64-byte key
Dim key As String = "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"

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

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

crypt.SetMacKeyEncoded(key,"hex")

Dim mac As String
mac = crypt.MacStringENC(strToSign)

Debug.WriteLine("Computed: " & mac)
Debug.WriteLine("Expected: " & expectedResult)