File Content: utils.py # This file is dual licensed under the terms of the Apache License, Version # 2.0, and the BSD License. See the LICENSE file in the root of this repository # for complete details. from __future__ import absolute_import, division, print_function import warnings from asn1crypto.algos import DSASignature import six from cryptography import utils from cryptography.hazmat.primitives import hashes def decode_rfc6979_signature(signature): warnings.warn( "decode_rfc6979_signature is deprecated and will " "be removed in a future version, use decode_dss_signature instead.", utils.PersistentlyDeprecated, stacklevel=2 ) return decode_dss_signature(signature) def decode_dss_signature(signature): data = DSASignature.load(signature, strict=True).native return data['r'], data['s'] def encode_rfc6979_signature(r, s): warnings.warn( "encode_rfc6979_signature is deprecated and will " "be removed in a future version, use encode_dss_signature instead.", utils.PersistentlyDeprecated, stacklevel=2 ) return encode_dss_signature(r, s) def encode_dss_signature(r, s): if ( not isinstance(r, six.integer_types) or not isinstance(s, six.integer_types) ): raise ValueError("Both r and s must be integers") return DSASignature({'r': r, 's': s}).dump() class Prehashed(object): def __init__(self, algorithm): if not isinstance(algorithm, hashes.HashAlgorithm): raise TypeError("Expected instance of HashAlgorithm.") self._algorithm = algorithm self._digest_size = algorithm.digest_size digest_size = utils.read_only_property("_digest_size") Submit