This is the documentation of the development version, check the Stable Version documentation.

RFC7638: JSON Web Key (JWK) Thumbprint

New in version v0.15.


JOSE implementation in Authlib. Tracking the status of JOSE specs at

This RFC7638 is used for computing a hash value over a JSON Web Key (JWK). The value can be used as an identity of the JWK.

The .thumbprint method is defined on the Key class, you can use it directly:

from authlib.jose import JsonWebKey

raw = read_file('rsa.pem')
key = JsonWebKey.import_key(raw)


If a key has no kid, you can add the value of .thumbprint() as a kid:

key['kid'] = key.thumbprint()

This method is available on every Key class, including OctKey, RSAKey, ECKey, and OKPKey.