// SYSTEM PANEL //
[ROOT]
/
lib64
/
python3.6
/
site-packages
/
cryptography
/
hazmat
/
backends
/
openssl
[ PARENT ]
EDIT :: 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. from __future__ import absolute_import, division, print_function 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: raise ValueError("Null shared key derived from public/private pair.") 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 or verifier." ) def _warn_sign_verify_deprecated(): warnings.warn( "signer and verifier have been deprecated. Please use sign " "and verify instead.", utils.PersistentlyDeprecated2017, stacklevel=3, )
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