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#ifndef AES_CRYPT_H
#define AES_CRYPT_H
#include "crypt_key.h"
#include "autoarray.h"
#include <openssl/aes.h>
class aes_key : public key {
struct aes_export {
unsigned char iv[AES_BLOCK_SIZE];
unsigned char key[1];
} aes_header;
auto_array<unsigned char> secret_key;
aes_key( const aes_key &that );
unsigned char cbc_base[AES_BLOCK_SIZE];
AES_KEY encrypt_key, decrypt_key;
void update_keys()
{
AES_set_decrypt_key( secret_key.get(), header.key_size*8, &decrypt_key );
AES_set_encrypt_key( secret_key.get(), header.key_size*8, &encrypt_key );
}
protected:
virtual key *gen_pad_key() const;
public:
aes_key( uint16_t key_size, uint32_t sum_span, uint32_t sum_mod, uint32_t sum_min_dist,
const unsigned char *buffer );
aes_key( size_t keybits, uint32_t sum_span, uint32_t sum_mod, uint32_t sum_min_dist );
virtual size_t block_size() const
{
return AES_BLOCK_SIZE;
}
virtual size_t exported_length() const
{
return key::exported_length()+header.key_size+block_size();
}
virtual size_t export_key( void *buffer ) const;
// Encryption/decryption functions
virtual void init_encrypt(); // Reset the IV values
// Encrypt/decrypt in place. "size" is not guarenteed to work if bigger than block_size
virtual void encrypt_block( unsigned char *data, size_t size );
virtual void decrypt_block( unsigned char *data, size_t size );
};
#endif // AES_CRYPT_H
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