Botan 2.19.3
Crypto and TLS for C&
gmac.h
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1/*
2 * GMAC
3 * (C) 2016 Matthias Gierlings, René Korthaus
4 * (C) 2017 Jack Lloyd
5 *
6 * Botan is released under the Simplified BSD License (see license.txt)
7 */
8
9#ifndef BOTAN_GMAC_H_
10#define BOTAN_GMAC_H_
11
12#include <botan/mac.h>
13
15
16namespace Botan {
17
18class BlockCipher;
19class GHASH;
20
21/**
22* GMAC
23*
24* GMAC requires a unique initialization vector be used for each message.
25* This must be provided via the MessageAuthenticationCode::start() API
26*/
28 {
29 public:
30 void clear() override;
31 std::string name() const override;
32 size_t output_length() const override;
33 MessageAuthenticationCode* clone() const override;
34
35 Key_Length_Specification key_spec() const override;
36
37 /**
38 * Creates a new GMAC instance.
39 *
40 * @param cipher the underlying block cipher to use
41 */
42 explicit GMAC(BlockCipher* cipher);
43
44 GMAC(const GMAC&) = delete;
45 GMAC& operator=(const GMAC&) = delete;
46
47 ~GMAC();
48
49 private:
50 void add_data(const uint8_t[], size_t) override;
51 void final_result(uint8_t[]) override;
52 void start_msg(const uint8_t nonce[], size_t nonce_len) override;
53 void key_schedule(const uint8_t key[], size_t size) override;
54
55 static const size_t GCM_BS = 16;
56 std::unique_ptr<BlockCipher> m_cipher;
57 std::unique_ptr<GHASH> m_ghash;
58 secure_vector<uint8_t> m_aad_buf;
59 size_t m_aad_buf_pos;
60 bool m_initialized;
61 };
62
63}
64#endif
virtual size_t output_length() const =0
GMAC & operator=(const GMAC &)=delete
GMAC(const GMAC &)=delete
virtual void start_msg(const uint8_t nonce[], size_t nonce_len)
Definition mac.cpp:149
virtual MessageAuthenticationCode * clone() const =0
virtual std::string name() const =0
virtual void clear()=0
virtual Key_Length_Specification key_spec() const =0
int(* final)(unsigned char *, CTX *)
#define BOTAN_PUBLIC_API(maj, min)
Definition compiler.h:31
#define BOTAN_FUTURE_INTERNAL_HEADER(hdr)
Definition compiler.h:136
std::vector< T, secure_allocator< T > > secure_vector
Definition secmem.h:65