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# 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
from asn1crypto.algos import DSASignature
import six
from cryptography import utils
from cryptography.hazmat.primitives import hashes
def decode_dss_signature(signature):
data = DSASignature.load(signature, strict=True).native
return data['r'], data['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")
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