Visual FoxPro

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 Visual FoxPro

LOCAL loCrypt
LOCAL lcStrToSign
LOCAL lcKey
LOCAL lcExpectedResult
LOCAL lcMac

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

loCrypt = CreateObject('Chilkat.Crypt2')

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.MacAlgorithm = "hmac"

loCrypt.SetMacKeyEncoded(lcKey,"hex")

lcMac = loCrypt.MacStringENC(lcStrToSign)

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

RELEASE loCrypt