diff options
Diffstat (limited to 'jwt/algorithms.py')
| -rw-r--r-- | jwt/algorithms.py | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/jwt/algorithms.py b/jwt/algorithms.py index 93fadf4..4fae441 100644 --- a/jwt/algorithms.py +++ b/jwt/algorithms.py @@ -18,6 +18,7 @@ from .utils import ( try: import cryptography.exceptions from cryptography.exceptions import InvalidSignature + from cryptography.hazmat.backends import default_backend from cryptography.hazmat.primitives import hashes from cryptography.hazmat.primitives.asymmetric import ec, padding from cryptography.hazmat.primitives.asymmetric.ec import ( @@ -111,6 +112,28 @@ class Algorithm: The interface for an algorithm used to sign and verify tokens. """ + def compute_hash_digest(self, bytestr: bytes) -> bytes: + """ + Compute a hash digest using the specified algorithm's hash algorithm. + + If there is no hash algorithm, raises a NotImplementedError. + """ + # lookup self.hash_alg if defined in a way that mypy can understand + hash_alg = getattr(self, "hash_alg", None) + if hash_alg is None: + raise NotImplementedError + + if ( + has_crypto + and isinstance(hash_alg, type) + and issubclass(hash_alg, hashes.HashAlgorithm) + ): + digest = hashes.Hash(hash_alg(), backend=default_backend()) + digest.update(bytestr) + return digest.finalize() + else: + return hash_alg(bytestr).digest() + def prepare_key(self, key): """ Performs necessary validation and conversions on the key and returns |