blob: 970f9c04717df2b1f420eafb3978f9002d4037c4 (
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
|
/*
* GMAC
* (C) 2016 Matthias Gierlings, René Korthaus
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_GMAC_H_
#define BOTAN_GMAC_H_
#include <botan/mac.h>
#include <botan/gcm.h>
#include <botan/block_cipher.h>
namespace Botan {
/**
* GMAC
*
* GMAC requires a unique initialization vector be used for each message.
* This must be provided via the MessageAuthenticationCode::start() API
*/
class BOTAN_PUBLIC_API(2,0) GMAC final : public MessageAuthenticationCode, public GHASH
{
public:
void clear() override;
std::string name() const override;
size_t output_length() const override;
MessageAuthenticationCode* clone() const override;
Key_Length_Specification key_spec() const override
{
return m_cipher->key_spec();
}
/**
* Creates a new GMAC instance.
*
* @param cipher the underlying block cipher to use
*/
explicit GMAC(BlockCipher* cipher);
GMAC(const GMAC&) = delete;
GMAC& operator=(const GMAC&) = delete;
private:
void add_data(const uint8_t[], size_t) override;
void final_result(uint8_t[]) override;
void start_msg(const uint8_t nonce[], size_t nonce_len) override;
void key_schedule(const uint8_t key[], size_t size) override;
static const size_t GCM_BS = 16;
secure_vector<uint8_t> m_aad_buf;
std::unique_ptr<BlockCipher> m_cipher;
bool m_initialized;
};
}
#endif
|
