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dsAES.h

Go to the documentation of this file.

#include <dsCypher.h>

                             
#define KEYLENGTH(keybits) ((keybits)/8)
#define RKLENGTH(keybits)  ((keybits)/8+28)
#define NROUNDS(keybits)   ((keybits)/32+6)

#define dsCypher_AES_OPTIMIZE_SPEED

class  dsAES : public dsBlockCypher
{
    /* This table is small and always static */
    static const dsCypher_word32_t dsAES::_rcon[10];
    
    /* These two tables always static and used 
       to generate all other one either on object creation
       or on_fly 
     */  
    static const dsCypher_word32_t dsAES::_Te0[256]  dsCypher_SECTION;
    static const dsCypher_word32_t dsAES::_Td0[256]  dsCypher_SECTION;

    /* These tables always filled-up on object
       creation */

    dsCypher_word32_t dsAES::_FSb[256];
    dsCypher_word32_t dsAES::_RSb[256];

    /* Prepared key storage */
    dsCypher_word32_t _rk[ RKLENGTH(128) ];

#ifdef dsCypher_AES_OPTIMIZE_SPEED
   
    /* All necessary constant pre-generated object startup -
       it require additional 6k memory, but make 
       encryption/decryption
       about 3 times faster 
    */

    dsCypher_word32_t dsAES::_Te1[256];
    dsCypher_word32_t dsAES::_Te2[256];
    dsCypher_word32_t dsAES::_Te3[256];

    dsCypher_word32_t dsAES::_Td1[256];
    dsCypher_word32_t dsAES::_Td2[256];
    dsCypher_word32_t dsAES::_Td3[256];
#endif

    void adjustKeForDecryption();
    void buildSTables();

public:
    
    /* dsCypher interfaces */
    virtual void setKey(const dsCypher_byte_t *p_key, dsCypher_word32_t p_keyLen, keyMode km) dsCypher_SECTION;

    virtual void encryptBlock(const dsCypher_word32_t *inBlock, dsCypher_word32_t *outBlock)  dsCypher_SECTION;
    virtual void decryptBlock(const dsCypher_word32_t *inBlock, dsCypher_word32_t *outBlock)  dsCypher_SECTION;

    dsAES(const dsCypher_byte_t *p_key, dsCypher_word32_t p_keyLen);
    dsAES();

#ifdef WITH_TEST_VECTORS
    virtual const dsCypher_byte_t * testExpectedResult( cmMODES p_mode );
    virtual const dsCypher_word32_t testExpectedResultLen( cmMODES p_mode );
    virtual const char *testAlgName();
#endif
};

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