(Chilkat2-Python) HMAC Hex String

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

Chilkat2 Python Downloads install with pip pip3 install chilkat2 or download... Python Module for Windows, Linux, Alpine Linux, MacOS, Solaris

import sys
import chilkat2

crypt = chilkat2.Crypt2()

success = crypt.UnlockComponent("Anything for 30-day trial")
if (success != True):
    print(crypt.LastErrorText)
    sys.exit()

# 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 = chilkat2.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)
print(macHex)