blob: b56e90fc40cef9d53268be9a4dbb606b8571a725 (
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
|
/*
* HMAC_DRBG (SP800-90A)
* (C) 2014 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
#ifndef BOTAN_HMAC_DRBG_H__
#define BOTAN_HMAC_DRBG_H__
#include <botan/rng.h>
#include <botan/mac.h>
namespace Botan {
/**
* HMAC_DRBG (SP800-90A)
*/
class BOTAN_DLL HMAC_DRBG : public RandomNumberGenerator
{
public:
void randomize(byte buf[], size_t buf_len);
bool is_seeded() const;
void clear();
std::string name() const;
void reseed(size_t poll_bits);
void add_entropy(const byte input[], size_t input_len);
/**
* @param mac the underlying mac function (eg HMAC(SHA-512))
* @param underlying_rng RNG used generating inputs (eg HMAC_RNG)
*/
HMAC_DRBG(MessageAuthenticationCode* mac,
RandomNumberGenerator* underlying_rng);
private:
void update(const byte input[], size_t input_len);
std::unique_ptr<MessageAuthenticationCode> m_mac;
std::unique_ptr<RandomNumberGenerator> m_prng;
secure_vector<byte> m_V;
size_t m_reseed_counter;
};
}
#endif
|
