Xbase++

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 Xbase++

LOCAL oCrypt
LOCAL cStrToSign
LOCAL cKey
LOCAL cExpectedResult
LOCAL cMac

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

oCrypt := CreateObject("Chilkat.Crypt2")

cStrToSign := "Sample #1"

//  64-byte key
cKey := "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"

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

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

oCrypt:SetMacKeyEncoded(cKey, "hex")

cMac := oCrypt:MacStringENC(cStrToSign)

? "Computed: " + cMac
? "Expected: " + cExpectedResult

oCrypt:destroy()