Generate a JWT token signed by a random self-signed key (RS256)

gen_random_jwt_token_rs256.py

#!/usr/bin/env python3

import subprocess
from datetime import datetime, timedelta

import jwt

subprocess.call(
    "openssl genrsa -out private.pem 1024".split(" "), stderr=subprocess.DEVNULL
)
subprocess.call(
    "openssl rsa -in private.pem -outform PEM -pubout -out public.pem".split(" "),
    stderr=subprocess.DEVNULL,
)

privkey = ""
with open("private.pem", "r") as f:
    privkey = f.read()

pubkey = ""
with open("public.pem", "r") as f:
    pubkey = f.read()


privkey = "\n".join([l.lstrip() for l in privkey.split("\n")])
pubkey = "\n".join([l.lstrip() for l in pubkey.split("\n")])
print("")
print("=== Public Key: ===")
print(pubkey)

iss="local"
aud = "local@app.local"
payload = {
    "iss": iss,
    "iat": 1577836800,
    "exp": 3155760000,
    "aud": aud,
    "cid": "abc123def456==",
    "sub": "local@local",
}
token = jwt.encode(payload, privkey, algorithm="RS256")
print("")
print("=== JWT Token: ===")
print(token)

print("")
print("=== JWT token successfully decoded and verified with public key: ===")
print(
    jwt.decode(
        token,
        key=pubkey,
        algorithms="RS256",
        issuer=iss,
        audience=aud,
    )
)