Tcl

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 Tcl

load ./chilkat.dll

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

set crypt [new_CkCrypt2]

set strToSign "Sample #1"

# 64-byte key
set key "000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f"

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

# Here is the code to duplicate the results:
CkCrypt2_put_HashAlgorithm $crypt "sha-1"
CkCrypt2_put_EncodingMode $crypt "hex"
CkCrypt2_put_MacAlgorithm $crypt "hmac"

CkCrypt2_SetMacKeyEncoded $crypt $key "hex"

set mac [CkCrypt2_macStringENC $crypt $strToSign]

puts "Computed: $mac"
puts "Expected: $expectedResult"

delete_CkCrypt2 $crypt