blob: 035214a902881d6c9337fbf2948e0a21479bf960 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
|
// Copyright 2021 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef TINK_INTERNAL_AES_UTIL_H_
#define TINK_INTERNAL_AES_UTIL_H_
#include <cstdint>
#include <memory>
#include "absl/strings/string_view.h"
#include "absl/types/span.h"
#include "openssl/aes.h"
#include "tink/util/secret_data.h"
#include "tink/util/status.h"
#include "tink/util/statusor.h"
namespace crypto {
namespace tink {
namespace internal {
// AES block size in bytes.
constexpr int AesBlockSize() { return 16; }
// Wrapper for BoringSSL/OpenSSL low-level functions that encrypt/decrypt (same
// operation in CTR mode) `data`, with IV `iv` and key `key`. The result is
// written to `out`. `out` may fully overlap with `data`; partial overlaps will
// result in an kInvalidArgument error. `iv` is incremented of the number of
// blocks that were encrypted/decrypted.
crypto::tink::util::Status AesCtr128Crypt(absl::string_view data,
uint8_t iv[AesBlockSize()],
const AES_KEY* key,
absl::Span<char> out);
// Returns a pointer to an AES-CTR EVP_CIPHER for the given key size
// `key_size_in_bytes`.
util::StatusOr<const EVP_CIPHER*> GetAesCtrCipherForKeySize(
uint32_t key_size_in_bytes);
// Returns a pointer to an AES-CBC EVP_CIPHER for the given key size
// `key_size_in_bytes`.
util::StatusOr<const EVP_CIPHER*> GetAesCbcCipherForKeySize(
uint32_t key_size_in_bytes);
} // namespace internal
} // namespace tink
} // namespace crypto
#endif // TINK_INTERNAL_AES_UTIL_H_
|
