HMAC SHA-1 Matching FIPS 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

Download Chilkat Crypt ActiveX

LOCAL loCrypt
LOCAL lnSuccess
LOCAL lcStrToSign
LOCAL lcKey
LOCAL lcExpectedResult
LOCAL lcMac

loCrypt = CreateObject('Chilkat.Crypt2')

lnSuccess = loCrypt.UnlockComponent("Anything for 30-day trial.")
IF (lnSuccess <> 1) THEN
    =MESSAGEBOX(loCrypt.LastErrorText)
    QUIT
ENDIF

lcStrToSign = "Sample #1"

*  64-byte key

lcKey = "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"

*  The expected result:
*  (from Appendix A.1 at http://csrc.nist.gov/publications/fips/fips198/fips-198a.pdf )

lcExpectedResult = "4f4ca3d5d68ba7cc0a1208c9c61e9c5da0403c0a"

*  Here is the code to duplicate the results:
loCrypt.HashAlgorithm = "sha-1"
loCrypt.EncodingMode = "hex"

loCrypt.SetHmacKeyEncoded(lcKey,"hex")

lcMac = loCrypt.HmacStringENC(lcStrToSign)

? "Computed: " + lcMac
? "Expected: " + lcExpectedResult