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# 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 typing from cryptography.hazmat.primitives import hashes from cryptography.hazmat.primitives.asymmetric.utils import Prehashed if typing.TYPE_CHECKING: from cryptography.hazmat.backends.openssl.backend import Backend def _evp_pkey_derive(backend: "Backend", evp_pkey, peer_public_key) -> bytes: 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( data: bytes, algorithm: typing.Union[Prehashed, hashes.HashAlgorithm], ) -> typing.Tuple[bytes, hashes.HashAlgorithm]: if not isinstance(algorithm, Prehashed): hash_ctx = hashes.Hash(algorithm) 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)