REDROOM

Navigation

Breadcrumbs

Create

Preview: poly1305.py Size: 1.64 KB

//lib64/python3.6/site-packages/cryptography/hazmat/primitives/poly1305.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.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	Perms	Modified	Actions
asymmetric DIR	-	drwxr-xr-x	2025-08-29 23:02:24	Edit Download recursive recursive
ciphers DIR	-	drwxr-xr-x	2025-08-29 23:02:24	Edit Download recursive recursive
kdf DIR	-	drwxr-xr-x	2025-08-29 23:02:24	Edit Download recursive recursive
serialization DIR	-	drwxr-xr-x	2025-08-29 23:02:24	Edit Download recursive recursive
twofactor DIR	-	drwxr-xr-x	2025-08-29 23:02:24	Edit Download recursive recursive
__pycache__ DIR	-	drwxr-xr-x	2025-08-29 23:02:24	Edit Download recursive recursive
cmac.py	2.13 KB	lrw-r--r--	2025-08-26 10:01:14	Edit Download recursive recursive
constant_time.py	430 B	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
hashes.py	6.17 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
hmac.py	2.30 KB	lrw-r--r--	2025-08-26 10:01:14	Edit Download recursive recursive
keywrap.py	5.60 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
mac.py	884 B	lrw-r--r--	2025-08-26 10:01:14	Edit Download recursive recursive
padding.py	5.61 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
poly1305.py	1.64 KB	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive
__init__.py	246 B	lrw-r--r--	2020-10-28 03:11:40	Edit Download recursive recursive

Directory Contents