Visual FoxPro

HMAC Hex String

See more Encryption Examples

Demonstrates how to compute an HMAC using a hexidecimal key and data. Visual FoxPro

LOCAL lnSuccess
LOCAL loCrypt
LOCAL lcKeyHex
LOCAL lcDataHex
LOCAL loBd
LOCAL lcMacHex

lnSuccess = 0

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

loCrypt = CreateObject('Chilkat.Crypt2')

* Set the MAC algorithm to HMAC
loCrypt.MacAlgorithm = "hmac"

* Our HMAC key will be the bytes represented in the following hex string.
* In other words, the HMAC key is composed of the bytes 0x41, 0xC2, 0x1C, ...
* (It is not composed of the us-ascii string '4', '1', 'C', ...)
lcKeyHex = "41C21CB9D7A02FC5D4FADB9E4755B9DE"
lnSuccess = loCrypt.SetMacKeyEncoded(lcKeyHex,"hex")

* Our desire is to HMAC the bytes represented in the following string:
lcDataHex = "C22078065B01460001000000010062043BF5B18228C8E02D17BCFE4E00561FA6DEC216EA97195CEB579942E275C21932258E3CD391E507FF4E7FD4C787A8447DA111C54A9C1795E7FF4C0BAA2EDA"

* We'll need to decode the hex to binary:
loBd = CreateObject('Chilkat.BinData')
loBd.AppendEncoded(lcDataHex,"hex")

* Do the HMAC-SHA256 hash and return as a hex string:
loCrypt.EncodingMode = "hex"
loCrypt.HashAlgorithm = "sha-256"
lcMacHex = loCrypt.MacBdENC(loBd)
? lcMacHex

RELEASE loCrypt
RELEASE loBd