(Chilkat2-Python) Verify JWT Using an ECC Public Key (ES256, ES384, ES512)

Demonstrates how to verify a JWT that was signed using an ECC private key.

This example verifies the ECC signature. It also does the following:

• Checks to see if the time constraints ("nbf" and "exp") are valid.
• Recovers the original JOSE header.
• Recovers the original claims JSON.

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

import chilkat2

# Demonstrates how to verify an JWT using an ECC public key.

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

pubKey = chilkat2.PublicKey()
success = pubKey.LoadFromFile("qa_data/pem/ecc_public.pem")

jwt = chilkat2.Jwt()

token = "eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDg1NzA4NzkyLCJuYmYiOjE0ODU3MDg3OTIsImV4cCI6MTQ4NTcxMjM5Mn0.wqsuyJpxJ073ox-lOiLFqG1lQocXe4hGf2XGZJRrO3qn0UusxI_bu3Gzky8gBsH4sA4u9TWZn5M-1wYMMIJk6Q"

# First verify the signature.
sigVerified = jwt.VerifyJwtPk(token,pubKey)
print("verified: " + str(sigVerified))

# Let's see if the time constraints, if any, are valid.
# The above JWT was created on the afternoon of 16-May-2016, with an expiration of 1 hour.
# If the current system time is before the "nbf" time, or after the "exp" time,
# then IsTimeValid will return false/0.
# Also, we'll allow a leeway of 60 seconds to account for any clock skew.
# Note: If the token has no "nbf" or "exp" claim fields, then IsTimeValid is always true.
leeway = 60
bTimeValid = jwt.IsTimeValid(token,leeway)
print("time constraints valid: " + str(bTimeValid))

# Now let's recover the original claims JSON (the payload).
payload = jwt.GetPayload(token)
# The payload will likely be in compact form:
print(payload)

# We can format for human viewing by loading it into Chilkat's JSON object
# and emit.
json = chilkat2.JsonObject()
success = json.Load(payload)
json.EmitCompact = False
print(json.Emit())

# We can recover the original JOSE header in the same way:
joseHeader = jwt.GetHeader(token)
# The payload will likely be in compact form:
print(joseHeader)

# We can format for human viewing by loading it into Chilkat's JSON object
# and emit.
success = json.Load(joseHeader)
json.EmitCompact = False
print(json.Emit())