blob: fc7ba522f0adc35b2e5df65149125a0c0a8f4762 (
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
|
/*
* CTR-BE Mode
* (C) 1999-2007 Jack Lloyd
*
* Distributed under the terms of the Botan license
*/
#ifndef BOTAN_CTR_BE_H__
#define BOTAN_CTR_BE_H__
#include <botan/block_cipher.h>
#include <botan/stream_cipher.h>
namespace Botan {
/**
* CTR-BE (Counter mode, big-endian)
*/
class BOTAN_DLL CTR_BE : public StreamCipher
{
public:
void cipher(const byte in[], byte out[], u32bit length);
void set_iv(const byte iv[], u32bit iv_len);
bool valid_iv_length(u32bit iv_len) const
{ return (iv_len <= permutation->BLOCK_SIZE); }
std::string name() const;
CTR_BE* clone() const
{ return new CTR_BE(permutation->clone()); }
void clear();
/**
* @param cipher the underlying block cipher to use
*/
CTR_BE(BlockCipher* cipher);
~CTR_BE();
private:
void key_schedule(const byte key[], u32bit key_len);
void increment_counter();
BlockCipher* permutation;
SecureVector<byte> counter, buffer;
u32bit position;
};
}
#endif
|
