PureBasic

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 PureBasic

IncludeFile "CkCrypt2.pb"

Procedure ChilkatExample()

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

    crypt.i = CkCrypt2::ckCreate()
    If crypt.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    strToSign.s = "Sample #1"

    ; 64-byte key
    key.s = "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"

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

    ; Here is the code to duplicate the results:
    CkCrypt2::setCkHashAlgorithm(crypt, "sha-1")
    CkCrypt2::setCkEncodingMode(crypt, "hex")
    CkCrypt2::setCkMacAlgorithm(crypt, "hmac")

    CkCrypt2::ckSetMacKeyEncoded(crypt,key,"hex")

    mac.s
    mac = CkCrypt2::ckMacStringENC(crypt,strToSign)

    Debug "Computed: " + mac
    Debug "Expected: " + expectedResult


    CkCrypt2::ckDispose(crypt)


    ProcedureReturn
EndProcedure