"n": "rKZ-1zdz_CoLekSynOtyWv6cPSSkV28Kb9kZZHyYL-yhkKnH_bHl8OpWiGxQiKP0ulLRIaq1IhSMetkZ8FfXH-iptIDu4lPb8gt0HQYkjcy3HoaKRXBw2F8fJQO4jQ-ufR4l-E0HRqwLywzdtAImNWmju3A4kx8s0iSGHGSHyE4EUdh5WKt-NMtfUPfB5v9_2bC-w6wH7zAEsI5nscMXnvz1u8w7g2_agyhKSK0D9OkJ02w3I4xLMlrtKEv2naoBGerWckKcQ1kBYUh6WASPdvTqX4pcAJi7Tg6jwQXIP1aEq0JU8C0zE3d33kaMoCN3SenIxpRczRzUHpbZ-gk5PQ",
"e": "AQAB",
How can I generate a public key from these values? Preferable via python or Linux programs. I'm sorry if the question is nonsense because of invalid values.
The source is here.
In Python, you can use Python-JOSE
What you got there in your link is a JSON Web Key Set (JWKS), a JSON formated array of JSON Web Keys (JWK).
n and e are the modulus and exponent of a RSA public key.
The function jwk.construct can directly create a key from a JWK. The key can then be used e.g. to verify a JWT (key.verify).
You can also use jwt.decode like shown in the code below and pass the JWK directly, or in PEM format.
from jose import jwk
from jose.utils import base64url_decode
token = "eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCIsImtpZCI6IlctNjduZWt0WVRjOEpWWVBlV0g1c1dlN1JZVm5uMFN5NzQxZjhUT0pfQWMifQ.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiYWRtaW4iOnRydWUsImlhdCI6MTUxNjIzOTAyMn0.hiKxeC66LIyVKOXjiOk7iScFPy_5-ATw7hEfqGij8sBZmwXAeTPT5BRFYHitFKSXomGqmy_63LLvg4zbhcTTmNf8XIeDAuLsC32soO5woSByisswWHVf8BgxMkI_FPW_oEtEQ8Xv3FL_1rF9j9Oy3jIjgjqhFhXUtsSQWAeuGYH-OQljFwiuO5Bqexcw-H71OEWvQLQof_6KJ0viJyte8QEwEVridyO834-ppHzeaoW2sTvZ22ZNfxPCew0Ul2V_TxHTtO7ZuJCZ81EmeIV6dYJ2GrYh3UN1x1PHy4-tEn-PL4otlaO3PYOcXfCHxHa6xtPsquzPZJnB1Vq8zULLfQ"
rsa_key = {
"kty": "RSA",
"kid": "W-67nektYTc8JVYPeWH5sWe7RYVnn0Sy741f8TOJ_Ac",
"use": "sig",
"alg": "RS256",
"n": "kFpGoVmBmmKepvBQiwq3hU9lIAuGsAPda4AVk712d3Z_QoS-5veGp4yltnyEFYyX867GOKDpbH7OF2uIjDg4-FPZwbuhiMscbkZzh25SQmfRtCT5ocUloQiopBcNAE-sd1p-ayUJWjhPrFoBrBLZHYxVEjY4JrWevQDj7kSeX7eJpud_VuZ77TNoIzj7d_iUuJUUlqF1ZF540igHKoVJJ6ujQLHh4ob8_izUuxX2iDq4h0VN3-uer59GsWw6OHgkOt85TsjMwYbeN9iw_7cNfLEYpSiH-sVHBCyKYQw7f8bKaChLxDRhUUTIEUUjGT9Ub_A3gOXq9TIi8BmbzrzVKQ",
"e": "AQAB"
}
key = jwk.construct(rsa_key)
message, encoded_sig = token.rsplit('.', 1)
decoded_sig = base64url_decode(encoded_sig + '=' * (4 - len(encoded_sig) % 4)) # looks weird, but without added padding I got errors
res = key.verify(bytes(message, "UTF-8"), decoded_sig)
# jwt.decode(token=token, key=key.to_pem().decode(), algorithms= 'RS256') # with PEM key
payload = jwt.decode(token=token, rsa_key, algorithms= 'RS256') # with JWK
print(res)
print(payload)
The result will be:
True {'sub': '1234567890', 'name': 'John Doe', 'admin': True, 'iat': 1516239022}
which means the token could be verified with that key.