crypto.py 文件源码

def rsa_key_fingerprint(key):
    """ Return the SHA256 fingerprint of an RSA public or private key in url safe BASE64 """
    fp = hashes.Hash(algorithm=hashes.SHA256(), backend=default_backend())

    if isinstance(key, rsa.RSAPrivateKey):
        fp.update(key.private_bytes(
            encoding=serialization.Encoding.DER,
            format=serialization.PrivateFormat.PKCS8,
            encryption_algorithm=serialization.NoEncryption()
        ))
    elif isinstance(key, rsa.RSAPublicKey):
        fp.update(key.public_bytes(
            encoding=serialization.Encoding.DER,
            format=serialization.PublicFormat.PKCS1
        ))

    return urlsafe_b64encode(fp.finalize()).decode()