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1#@!#!123s

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

Filename : poly1305.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.exceptions import (
    AlreadyFinalized,
    UnsupportedAlgorithm,
    _Reasons,
)


class Poly1305(object):
    def __init__(self, key):
        from cryptography.hazmat.backends.openssl.backend import backend

        if not backend.poly1305_supported():
            raise UnsupportedAlgorithm(
                "poly1305 is not supported by this version of OpenSSL.",
                _Reasons.UNSUPPORTED_MAC,
            )
        self._ctx = backend.create_poly1305_ctx(key)

    def update(self, data):
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        utils._check_byteslike("data", data)
        self._ctx.update(data)

    def finalize(self):
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        mac = self._ctx.finalize()
        self._ctx = None
        return mac

    def verify(self, tag):
        utils._check_bytes("tag", tag)
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")

        ctx, self._ctx = self._ctx, None
        ctx.verify(tag)

    @classmethod
    def generate_tag(cls, key, data):
        p = Poly1305(key)
        p.update(data)
        return p.finalize()

    @classmethod
    def verify_tag(cls, key, data, tag):
        p = Poly1305(key)
        p.update(data)
        p.verify(tag)

Name	Size	Last Modified	Owner	Permissions
asymmetric	Dir	December 04 2020 5:17:28	root	0755
ciphers	Dir	December 04 2020 5:17:28	root	0755
kdf	Dir	December 04 2020 5:17:28	root	0755
__pycache__	Dir	December 04 2020 5:17:28	root	0755
serialization	Dir	December 04 2020 5:17:28	root	0755
twofactor	Dir	December 04 2020 5:17:28	root	0755
cmac.py	2.08 KB	December 04 2020 5:17:28	root	0644
constant_time.py	0.42 KB	December 04 2020 5:17:28	root	0644
hashes.py	6.167 KB	December 04 2020 5:17:28	root	0644
hmac.py	2.252 KB	December 04 2020 5:17:28	root	0644
__init__.py	0.24 KB	December 04 2020 5:17:28	root	0644
keywrap.py	5.596 KB	December 04 2020 5:17:28	root	0644
padding.py	5.608 KB	December 04 2020 5:17:28	root	0644
poly1305.py	1.64 KB	December 04 2020 5:17:28	root	0644

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