(Tcl) Demonstrates the MacBytes Method

Demonstrates the MacBytes method to do HMAC-SHA256, HMAC-SHA1, and HMAC-MD5.

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load ./chilkat.dll

# This example assumes Chilkat Crypt2 to have been previously unlocked.
# See Unlock Crypt2 for sample code.

# Demonstrates how to reproduce the following results found at
# https://en.wikipedia.org/wiki/Hash-based_message_authentication_code

# HMAC_SHA256("key", "The quick brown fox jumps over the lazy dog") = 0xf7bc83f430538424b13298e6aa6fb143ef4d59a14946175997479dbc2d1a3cd8
# HMAC_MD5("key", "The quick brown fox jumps over the lazy dog")    = 0x80070713463e7749b90c2dc24911e275
# HMAC_SHA1("key", "The quick brown fox jumps over the lazy dog")   = 0xde7c9b85b8b78aa6bc8a7a36f70a90701c9db4d9

set crypt [new_CkCrypt2]

CkCrypt2_put_MacAlgorithm $crypt "hmac"
CkCrypt2_put_EncodingMode $crypt "hex"
CkCrypt2_SetMacKeyString $crypt "key"
set sData "The quick brown fox jumps over the lazy dog"

# We're doing this in a convoluted, roundabout fashion to show syntax
# and data types for handling binary data.
# The straightforward way of doing an HMAC on a string is
# shown here: HMAC String
set dataToHmac [new_CkByteData]

set binData [new_CkBinData]

CkBinData_AppendString $binData $sData "utf-8"
set success [CkBinData_GetBinary $binData $dataToHmac]

set macBytes [new_CkByteData]

CkCrypt2_put_HashAlgorithm $crypt "SHA-256"
set success [CkCrypt2_MacBytes $crypt $dataToHmac $macBytes]
CkBinData_Clear $binData
CkBinData_AppendBinary $binData $macBytes
puts "HMAC_SHA256: [CkBinData_getEncoded $binData hex]"

CkCrypt2_put_HashAlgorithm $crypt "MD5"
set success [CkCrypt2_MacBytes $crypt $dataToHmac $macBytes]
CkBinData_Clear $binData
CkBinData_AppendBinary $binData $macBytes
puts "HMAC_MD5: [CkBinData_getEncoded $binData hex]"

CkCrypt2_put_HashAlgorithm $crypt "SHA-1"
set success [CkCrypt2_MacBytes $crypt $dataToHmac $macBytes]
CkBinData_Clear $binData
CkBinData_AppendBinary $binData $macBytes
puts "HMAC_SHA1: [CkBinData_getEncoded $binData hex]"

# The output is the same (ignore case)
# HMAC_SHA256: F7BC83F430538424B13298E6AA6FB143EF4D59A14946175997479DBC2D1A3CD8
# HMAC_MD5: 80070713463E7749B90C2DC24911E275
# HMAC_SHA1: DE7C9B85B8B78AA6BC8A7A36F70A90701C9DB4D9

delete_CkCrypt2 $crypt
delete_CkByteData $dataToHmac
delete_CkBinData $binData
delete_CkByteData $macBytes