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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

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")

Filemanager

Name Type Size Permission Actions
__pycache__ Folder 0755
__init__.py File 1020 B 0644
dh.py File 5.33 KB 0644
dsa.py File 6.73 KB 0644
ec.py File 9.59 KB 0644
padding.py File 2.21 KB 0644
rsa.py File 10.08 KB 0644
utils.py File 1.68 KB 0644
x25519.py File 1.61 KB 0644