ꦫꦣꦺꦤ꧀ꦄꦤ꧀ꦠꦱꦺꦤ

PATH: lib64 / python3.9 / site-packages / cryptography / hazmat / primitives

# 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 cryptography import utils
from cryptography.exceptions import (
    AlreadyFinalized,
    UnsupportedAlgorithm,
    _Reasons,
)

class Poly1305(object):
    def __init__(self, key: bytes):
        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: bytes) -> None:
        if self._ctx is None:
            raise AlreadyFinalized("Context was already finalized.")
        utils._check_byteslike("data", data)
        self._ctx.update(data)

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

def verify(self, tag: bytes) -> None:
        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: bytes, data: bytes) -> bytes:
        p = Poly1305(key)
        p.update(data)
        return p.finalize()

@classmethod
    def verify_tag(cls, key: bytes, data: bytes, tag: bytes) -> None:
        p = Poly1305(key)
        p.update(data)
        p.verify(tag)

[-] cmac.py [open]
[-] keywrap.py [open]
[+] ..
[-] _asymmetric.py [open]
[+] serialization
[+] __pycache__
[-] hashes.py [open]
[+] asymmetric
[-] poly1305.py [open]
[-] _cipheralgorithm.py [open]
[+] kdf
[-] padding.py [open]
[+] twofactor
[-] hmac.py [open]
[-] __init__.py [open]
[+] ciphers
[-] constant_time.py [open]
[-] _serialization.py [open]