blob: 1948ffe484f05a220e06101bc63b25f93837a38c (
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
|
/*
* CTR Mode
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_COUNTER_MODE_H__
#define BOTAN_COUNTER_MODE_H__
#include <botan/key_filt.h>
#include <botan/block_cipher.h>
namespace Botan {
/*
* CTR-BE Mode
*/
class BOTAN_DLL CTR_BE : public Keyed_Filter
{
public:
std::string name() const;
void set_iv(const InitializationVector&);
void set_key(const SymmetricKey& key) { cipher->set_key(key); }
bool valid_keylength(u32bit key_len) const
{ return cipher->valid_keylength(key_len); }
CTR_BE(BlockCipher*);
CTR_BE(BlockCipher*, const SymmetricKey&, const InitializationVector&);
~CTR_BE();
private:
void write(const byte[], u32bit);
void increment_counter();
BlockCipher* cipher;
SecureVector<byte> counter, enc_buffer;
u32bit position;
};
}
#endif
|
