(Lianja) HMAC Hex String

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

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loCrypt = createobject("CkCrypt2")

llSuccess = loCrypt.UnlockComponent("Anything for 30-day trial")
if (llSuccess <> .T.) then
    ? loCrypt.LastErrorText
    release loCrypt
    return
endif

//  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"
llSuccess = 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("CkBinData")
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