Sign a JWS with an HMAC Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetMacKey, which sets the symmetric MAC key for a signature. The key bytes are supplied in a named encoding such as hex or base64.

import sys
import chilkat2

success = False

jws = chilkat2.Jws()

# Protected header specifying HMAC-SHA256.
header = chilkat2.JsonObject()
header.UpdateString("alg","HS256")
success = jws.SetProtectedHeader(0,header)
if (success == False):
    print(jws.LastErrorText)
    sys.exit()

bIncludeBom = False
success = jws.SetPayload("This is the content to sign.","utf-8",bIncludeBom)
if (success == False):
    print(jws.LastErrorText)
    sys.exit()

# Set the symmetric MAC key for signature 0.  The key bytes are provided in the named encoding (here
# base64).  In production, obtain the key from a secure source rather than hard-coding it.
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jws.SetMacKey(0,base64Key,"base64")
if (success == False):
    print(jws.LastErrorText)
    sys.exit()

jwsCompact = jws.CreateJws()
if (jws.LastMethodSuccess == False):
    print(jws.LastErrorText)
    sys.exit()

print(jwsCompact)