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__pycache__	-	Open
aead.py	6.1 MB	View DL Edit
backend.py	86.21 MB	View DL Edit
ciphers.py	10.15 MB	View DL Edit
cmac.py	2.78 MB	View DL Edit
decode_asn1.py	1.09 MB	View DL Edit
dh.py	10.95 MB	View DL Edit
dsa.py	10.46 MB	View DL Edit
ec.py	12.54 MB	View DL Edit
ed448.py	5.61 MB	View DL Edit
ed25519.py	5.65 MB	View DL Edit
encode_asn1.py	570 B	View DL Edit
hashes.py	3.03 MB	View DL Edit
hmac.py	2.87 MB	View DL Edit
poly1305.py	2.29 MB	View DL Edit
rsa.py	20.95 MB	View DL Edit
utils.py	2.39 MB	View DL Edit
x448.py	4.04 MB	View DL Edit
x509.py	1.42 MB	View DL Edit
x25519.py	4.51 MB	View DL Edit
__init__.py	271 B	View DL Edit

Edit file: /usr/lib64/python3.9/site-packages/cryptography/hazmat/backends/openssl/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.

import warnings

from cryptography import utils
from cryptography.hazmat.primitives import hashes
from cryptography.hazmat.primitives.asymmetric.utils import Prehashed

def _evp_pkey_derive(backend, evp_pkey, peer_public_key):
    ctx = backend._lib.EVP_PKEY_CTX_new(evp_pkey, backend._ffi.NULL)
    backend.openssl_assert(ctx != backend._ffi.NULL)
    ctx = backend._ffi.gc(ctx, backend._lib.EVP_PKEY_CTX_free)
    res = backend._lib.EVP_PKEY_derive_init(ctx)
    backend.openssl_assert(res == 1)
    res = backend._lib.EVP_PKEY_derive_set_peer(ctx, peer_public_key._evp_pkey)
    backend.openssl_assert(res == 1)
    keylen = backend._ffi.new("size_t *")
    res = backend._lib.EVP_PKEY_derive(ctx, backend._ffi.NULL, keylen)
    backend.openssl_assert(res == 1)
    backend.openssl_assert(keylen[0] > 0)
    buf = backend._ffi.new("unsigned char[]", keylen[0])
    res = backend._lib.EVP_PKEY_derive(ctx, buf, keylen)
    if res != 1:
        errors_with_text = backend._consume_errors_with_text()
        raise ValueError("Error computing shared key.", errors_with_text)

return backend._ffi.buffer(buf, keylen[0])[:]

def _calculate_digest_and_algorithm(backend, data, algorithm):
    if not isinstance(algorithm, Prehashed):
        hash_ctx = hashes.Hash(algorithm, backend)
        hash_ctx.update(data)
        data = hash_ctx.finalize()
    else:
        algorithm = algorithm._algorithm

if len(data) != algorithm.digest_size:
        raise ValueError(
            "The provided data must be the same length as the hash "
            "algorithm's digest size."
        )

return (data, algorithm)

def _check_not_prehashed(signature_algorithm):
    if isinstance(signature_algorithm, Prehashed):
        raise TypeError(
            "Prehashed is only supported in the sign and verify methods. "
            "It cannot be used with signer, verifier or "
            "recover_data_from_signature."
        )

def _warn_sign_verify_deprecated():
    warnings.warn(
        "signer and verifier have been deprecated since 2.1. Please use sign "
        "and verify instead. Support for these functions will be dropped"
        " in the next release of cryptography (37.0).",
        utils.PersistentlyDeprecated2017,
        stacklevel=3,
    )

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