Validate a JWS with a Public Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetPublicKey, which sets the public key used to validate a signature of a loaded JWS.

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

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()

#  The file path is relative to the application's current working directory.  An absolute path
#  may also be used.  Supply the path appropriate to your own environment.
#  Load the signer's public key and set it for validating signature 0.
pubKey = chilkat.CkPublicKey()
success = pubKey.LoadFromFile("qa_data/signer_pubkey.pem")
if (success == False):
    print(pubKey.lastErrorText())
    sys.exit()

success = jws.SetPublicKey(0,pubKey)
if (success == False):
    print(jws.lastErrorText())
    sys.exit()

#  Validate the signature.  Validate returns 1 when valid, 0 when 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.")