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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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