(PowerBuilder) HMAC Hex String

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

integer li_rc
oleobject loo_Crypt
string ls_KeyHex
integer li_Success
string ls_DataHex
oleobject loo_Bd
string ls_MacHex

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

loo_Crypt = create oleobject
// Use "Chilkat_9_5_0.Crypt2" for versions of Chilkat < 10.0.0
li_rc = loo_Crypt.ConnectToNewObject("Chilkat.Crypt2")
if li_rc < 0 then
    destroy loo_Crypt
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Set the MAC algorithm to HMAC
loo_Crypt.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', ...)
ls_KeyHex = "41C21CB9D7A02FC5D4FADB9E4755B9DE"
li_Success = loo_Crypt.SetMacKeyEncoded(ls_KeyHex,"hex")

// Our desire is to HMAC the bytes represented in the following string:
ls_DataHex = "C22078065B01460001000000010062043BF5B18228C8E02D17BCFE4E00561FA6DEC216EA97195CEB579942E275C21932258E3CD391E507FF4E7FD4C787A8447DA111C54A9C1795E7FF4C0BAA2EDA"

// We'll need to decode the hex to binary:
loo_Bd = create oleobject
// Use "Chilkat_9_5_0.BinData" for versions of Chilkat < 10.0.0
li_rc = loo_Bd.ConnectToNewObject("Chilkat.BinData")

loo_Bd.AppendEncoded(ls_DataHex,"hex")

// Do the HMAC-SHA256 hash and return as a hex string:
loo_Crypt.EncodingMode = "hex"
loo_Crypt.HashAlgorithm = "sha-256"
ls_MacHex = loo_Crypt.MacBdENC(loo_Bd)
Write-Debug ls_MacHex


destroy loo_Crypt
destroy loo_Bd