utils.py 756 B

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  1. # This file is dual licensed under the terms of the Apache License, Version
  2. # 2.0, and the BSD License. See the LICENSE file in the root of this repository
  3. # for complete details.
  4. from cryptography.hazmat.bindings._rust import asn1
  5. from cryptography.hazmat.primitives import hashes
  6. decode_dss_signature = asn1.decode_dss_signature
  7. encode_dss_signature = asn1.encode_dss_signature
  8. class Prehashed:
  9. def __init__(self, algorithm: hashes.HashAlgorithm):
  10. if not isinstance(algorithm, hashes.HashAlgorithm):
  11. raise TypeError("Expected instance of HashAlgorithm.")
  12. self._algorithm = algorithm
  13. self._digest_size = algorithm.digest_size
  14. @property
  15. def digest_size(self) -> int:
  16. return self._digest_size