diff options
Diffstat (limited to 'google/auth/crypt/es256.py')
| -rw-r--r-- | google/auth/crypt/es256.py | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/google/auth/crypt/es256.py b/google/auth/crypt/es256.py index 71dcbfc..c6d6176 100644 --- a/google/auth/crypt/es256.py +++ b/google/auth/crypt/es256.py @@ -15,6 +15,7 @@ """ECDSA (ES256) verifier and signer that use the ``cryptography`` library. """ +from cryptography import utils import cryptography.exceptions from cryptography.hazmat import backends from cryptography.hazmat.primitives import hashes @@ -52,8 +53,8 @@ class ES256Verifier(base.Verifier): sig_bytes = _helpers.to_bytes(signature) if len(sig_bytes) != 64: return False - r = int.from_bytes(sig_bytes[:32], byteorder="big") - s = int.from_bytes(sig_bytes[32:], byteorder="big") + r = utils.int_from_bytes(sig_bytes[:32], byteorder="big") + s = utils.int_from_bytes(sig_bytes[32:], byteorder="big") asn1_sig = encode_dss_signature(r, s) message = _helpers.to_bytes(message) @@ -120,7 +121,7 @@ class ES256Signer(base.Signer, base.FromServiceAccountMixin): # Convert ASN1 encoded signature to (r||s) raw signature. (r, s) = decode_dss_signature(asn1_signature) - return r.to_bytes(32, byteorder="big") + s.to_bytes(32, byteorder="big") + return utils.int_to_bytes(r, 32) + utils.int_to_bytes(s, 32) @classmethod def from_string(cls, key, key_id=None): |