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-rw-r--r--src/experimental/ciphermodecbc.h54
1 files changed, 54 insertions, 0 deletions
diff --git a/src/experimental/ciphermodecbc.h b/src/experimental/ciphermodecbc.h
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+++ b/src/experimental/ciphermodecbc.h
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1#ifndef BU_MODE_CBC_H
2#define BU_MODE_CBC_H
3
4#include "bu/filter.h"
5#include "bu/string.h"
6
7namespace Bu
8{
9 template<int iBlockSize, typename CipherType>
10 class CipherModeCbc : public CipherType
11 {
12 public:
13 CipherModeCbc(class Stream &rNext ) :
14 CipherType( rNext ),
15 bStart( true )
16 {
17 memset( aVector, 0, iBlockSize );
18 }
19
20 virtual ~CipherModeCbc()
21 {
22 }
23
24 void setIv( const Bu::String &sIv )
25 {
26 memcpy( aVector, sIv.getStr(), iBlockSize );
27 }
28
29 protected:
30 void decipher( void *pBuf )
31 {
32 uint8_t aTmp[iBlockSize];
33 memcpy( aTmp, pBuf, iBlockSize );
34 CipherType::decipher( pBuf );
35 for( int j = 0; j < iBlockSize; j++ )
36 ((uint8_t *)pBuf)[j] ^= aVector[j];
37 memcpy( aVector, aTmp, iBlockSize );
38 }
39
40 void encipher( void *pBuf )
41 {
42 for( int j = 0; j < iBlockSize; j++ )
43 ((uint8_t *)pBuf)[j] ^= aVector[j];
44 CipherType::encipher( pBuf );
45 memcpy( aVector, pBuf, iBlockSize );
46 }
47
48 private:
49 bool bStart;
50 uint8_t aVector[iBlockSize];
51 };
52};
53
54#endif