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
61
|
/*
* Copyright (C) 2016 The Android Open Source Project
*
* 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 CRYPTO_UTILS_ANDROID_PUBKEY_H
#define CRYPTO_UTILS_ANDROID_PUBKEY_H
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <openssl/rsa.h>
#ifdef __cplusplus
extern "C" {
#endif
// Size of an RSA modulus such as an encrypted block or a signature.
#define ANDROID_PUBKEY_MODULUS_SIZE (2048 / 8)
// Size of an encoded RSA key.
#define ANDROID_PUBKEY_ENCODED_SIZE \
(3 * sizeof(uint32_t) + 2 * ANDROID_PUBKEY_MODULUS_SIZE)
/* Allocates a new RSA |key| object, decodes a public RSA key stored in
* Android's custom binary format from |key_buffer| and sets the key parameters
* in |key|. |size| specifies the size of the key buffer and must be at least
* |ANDROID_PUBKEY_ENCODED_SIZE|. The resulting |*key| can be used with the
* standard BoringSSL API to perform public operations.
*
* Returns true if successful, in which case the caller receives ownership of
* the |*key| object, i.e. needs to call RSA_free() when done with it. If there
* is an error, |key| is left untouched and the return value will be false.
*/
bool android_pubkey_decode(const uint8_t* key_buffer, size_t size, RSA** key);
/* Encodes |key| in the Android RSA public key binary format and stores the
* bytes in |key_buffer|. |key_buffer| should be of size at least
* |ANDROID_PUBKEY_ENCODED_SIZE|.
*
* Returns true if successful, false on error.
*/
bool android_pubkey_encode(const RSA* key, uint8_t* key_buffer, size_t size);
#ifdef __cplusplus
} // extern "C"
#endif
#endif // CRYPTO_UTILS_ANDROID_PUBKEY_H
|
