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ðŸ“ ..
ðŸ“„ __init__.py(336 B)
ðŸ“ __pycache__
ðŸ“„ aead.py(5.63 KB)
ðŸ“„ backend.py(104.4 KB)
ðŸ“„ ciphers.py(8.43 KB)
ðŸ“„ cmac.py(2.83 KB)
ðŸ“„ decode_asn1.py(31.59 KB)
ðŸ“„ dh.py(10 KB)
ðŸ“„ dsa.py(9.8 KB)
ðŸ“„ ec.py(11.8 KB)
ðŸ“„ ed25519.py(5.54 KB)
ðŸ“„ ed448.py(5.49 KB)
ðŸ“„ encode_asn1.py(23 KB)
ðŸ“„ hashes.py(3.09 KB)
ðŸ“„ hmac.py(2.99 KB)
ðŸ“„ ocsp.py(13.7 KB)
ðŸ“„ poly1305.py(2.36 KB)
ðŸ“„ rsa.py(16.97 KB)
ðŸ“„ utils.py(2.25 KB)
ðŸ“„ x25519.py(4.38 KB)
ðŸ“„ x448.py(3.92 KB)
ðŸ“„ x509.py(21.18 KB)

Editing: 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.exceptions import InvalidSignature
from cryptography.hazmat.primitives import constant_time

_POLY1305_TAG_SIZE = 16
_POLY1305_KEY_SIZE = 32

class _Poly1305Context(object):
    def __init__(self, backend, key):
        self._backend = backend

key_ptr = self._backend._ffi.from_buffer(key)
        # This function copies the key into OpenSSL-owned memory so we don't
        # need to retain it ourselves
        evp_pkey = self._backend._lib.EVP_PKEY_new_raw_private_key(
            self._backend._lib.NID_poly1305,
            self._backend._ffi.NULL,
            key_ptr,
            len(key),
        )
        self._backend.openssl_assert(evp_pkey != self._backend._ffi.NULL)
        self._evp_pkey = self._backend._ffi.gc(
            evp_pkey, self._backend._lib.EVP_PKEY_free
        )
        ctx = self._backend._lib.Cryptography_EVP_MD_CTX_new()
        self._backend.openssl_assert(ctx != self._backend._ffi.NULL)
        self._ctx = self._backend._ffi.gc(
            ctx, self._backend._lib.Cryptography_EVP_MD_CTX_free
        )
        res = self._backend._lib.EVP_DigestSignInit(
            self._ctx,
            self._backend._ffi.NULL,
            self._backend._ffi.NULL,
            self._backend._ffi.NULL,
            self._evp_pkey,
        )
        self._backend.openssl_assert(res == 1)

def update(self, data):
        data_ptr = self._backend._ffi.from_buffer(data)
        res = self._backend._lib.EVP_DigestSignUpdate(
            self._ctx, data_ptr, len(data)
        )
        self._backend.openssl_assert(res != 0)

def finalize(self):
        buf = self._backend._ffi.new("unsigned char[]", _POLY1305_TAG_SIZE)
        outlen = self._backend._ffi.new("size_t *")
        res = self._backend._lib.EVP_DigestSignFinal(self._ctx, buf, outlen)
        self._backend.openssl_assert(res != 0)
        self._backend.openssl_assert(outlen[0] == _POLY1305_TAG_SIZE)
        return self._backend._ffi.buffer(buf)[: outlen[0]]

def verify(self, tag):
        mac = self.finalize()
        if not constant_time.bytes_eq(mac, tag):
            raise InvalidSignature("Value did not match computed tag.")

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Editing: poly1305.py

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