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//lib64/python3.6/site-packages/cryptography/hazmat/primitives/asymmetric/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

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	Perms	Modified	Actions
__pycache__ DIR	-	drwxr-xr-x	2025-08-29 23:02:24	Edit Download recursive recursive
dh.py	5.53 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
dsa.py	7.01 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
ec.py	13.68 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
ed448.py	2.27 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
ed25519.py	2.34 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
padding.py	2.20 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
rsa.py	10.25 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
utils.py	1.33 KB	lrw-r--r--	2025-08-26 10:01:14	Edit Download recursive recursive
x448.py	2.20 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
x25519.py	2.22 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
__init__.py	1020 B	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive

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