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

📁 ..
📄 __init__.py(1020 B)
📁 __pycache__
📄 dh.py(5.53 KB)
📄 dsa.py(7.01 KB)
📄 ec.py(13.68 KB)
📄 ed25519.py(2.34 KB)
📄 ed448.py(2.27 KB)
📄 padding.py(2.2 KB)
📄 rsa.py(10.25 KB)
📄 utils.py(1.33 KB)
📄 x25519.py(2.22 KB)
📄 x448.py(2.2 KB)

Editing: 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)

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Editing: utils.py

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