Validate a JWS Signature

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.Validate, which validates exactly one signature, identified by a zero-based index, using the key configured at that same index.

import sys
import chilkat

success = False

jws = chilkat.CkJws()

#  Load the JWS compact serialization.
jwsCompact = "eyJhbGciOiJIUzI1NiJ9.VGhpcyBpcyB0aGUgY29udGVudCB0byBzaWduLg.<signature>"
success = jws.LoadJws(jwsCompact)
if (success == False):
    print(jws.lastErrorText())
    sys.exit()

#  Provide the key for signature 0 (here an HMAC key).
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jws.SetMacKey(0,base64Key,"base64")
if (success == False):
    print(jws.lastErrorText())
    sys.exit()

#  Validate the signature identified by the zero-based index, using the key configured at that index.
#  Validate returns 1 when the signature or MAC is cryptographically valid, 0 when it is not, or a
#  negative value on error.
v = jws.Validate(0)
if (v < 0):
    print(jws.lastErrorText())
    sys.exit()

if (v != 1):
    print("The signature is not valid.")
    sys.exit()

print("The signature is valid.")