(PowerShell) HMAC Hex String

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

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Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

$crypt = New-Object Chilkat.Crypt2

# Set the MAC algorithm to HMAC
$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', ...)
$keyHex = "41C21CB9D7A02FC5D4FADB9E4755B9DE"
$success = $crypt.SetMacKeyEncoded($keyHex,"hex")

# Our desire is to HMAC the bytes represented in the following string:
$dataHex = "C22078065B01460001000000010062043BF5B18228C8E02D17BCFE4E00561FA6DEC216EA97195CEB579942E275C21932258E3CD391E507FF4E7FD4C787A8447DA111C54A9C1795E7FF4C0BAA2EDA"

# We'll need to decode the hex to binary:
$bd = New-Object Chilkat.BinData
$bd.AppendEncoded($dataHex,"hex")

# Do the HMAC-SHA256 hash and return as a hex string:
$crypt.EncodingMode = "hex"
$crypt.HashAlgorithm = "sha-256"
$macHex = $crypt.MacBdENC($bd)
$($macHex)