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Filename : utils.py

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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 cryptography import utils
from cryptography.hazmat._der import (
    DERReader,
    INTEGER,
    SEQUENCE,
    encode_der,
    encode_der_integer,
)
from cryptography.hazmat.primitives import hashes


def decode_dss_signature(signature):
    with DERReader(signature).read_single_element(SEQUENCE) as seq:
        r = seq.read_element(INTEGER).as_integer()
        s = seq.read_element(INTEGER).as_integer()
        return r, s


def encode_dss_signature(r, s):
    return encode_der(
        SEQUENCE,
        encode_der(INTEGER, encode_der_integer(r)),
        encode_der(INTEGER, encode_der_integer(s)),
    )


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")


def decode_rfc6979_signature(signature):
    return decode_dss_signature(signature)


def encode_rfc6979_signature(r, s):
    return encode_dss_signature(r, s)

Name	Size	Last Modified	Owner	Permissions
__pycache__	Dir	February 29 2024 3:41:17	root	0755
__init__.py	0.996 KB	October 28 2020 3:11:40	root	0644
dh.py	5.528 KB	October 28 2020 3:11:40	root	0644
dsa.py	7.013 KB	October 28 2020 3:11:40	root	0644
ec.py	13.678 KB	October 28 2020 3:11:40	root	0644
ed25519.py	2.345 KB	October 28 2020 3:11:40	root	0644
ed448.py	2.273 KB	October 28 2020 3:11:40	root	0644
padding.py	2.197 KB	October 28 2020 3:11:40	root	0644
rsa.py	10.248 KB	October 28 2020 3:11:40	root	0644
utils.py	1.331 KB	February 27 2024 8:46:12	root	0644
x25519.py	2.224 KB	October 28 2020 3:11:40	root	0644
x448.py	2.202 KB	October 28 2020 3:11:40	root	0644

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