Visual FoxPro

Demonstrates the MacBytesENC Method

Demonstrates the MacBytesENC method to do HMAC-SHA256, HMAC-SHA1, and HMAC-MD5. Visual FoxPro

LOCAL loCrypt
LOCAL lcSData
LOCAL loDataToHmac
LOCAL loBinData

* 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

loCrypt = CreateObject('Chilkat.Crypt2')

loCrypt.MacAlgorithm = "hmac"
loCrypt.EncodingMode = "hex"
loCrypt.SetMacKeyString("key")
lcSData = "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

loBinData = CreateObject('Chilkat.BinData')
loBinData.AppendString(lcSData,"utf-8")
loDataToHmac = loBinData.GetBinary()

loCrypt.HashAlgorithm = "SHA-256"
? "HMAC_SHA256: " + loCrypt.MacBytesENC(loDataToHmac)

loCrypt.HashAlgorithm = "MD5"
? "HMAC_MD5: " + loCrypt.MacBytesENC(loDataToHmac)

loCrypt.HashAlgorithm = "SHA-1"
? "HMAC_SHA1: " + loCrypt.MacBytesENC(loDataToHmac)

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

RELEASE loCrypt
RELEASE loBinData