Botan  1.11.15
src/lib/block/serpent/serpent.h
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00001 /*
00002 * Serpent
00003 * (C) 1999-2007 Jack Lloyd
00004 *
00005 * Botan is released under the Simplified BSD License (see license.txt)
00006 */
00007 
00008 #ifndef BOTAN_SERPENT_H__
00009 #define BOTAN_SERPENT_H__
00010 
00011 #include <botan/block_cipher.h>
00012 
00013 namespace Botan {
00014 
00015 /**
00016 * Serpent, an AES finalist
00017 */
00018 class BOTAN_DLL Serpent : public Block_Cipher_Fixed_Params<16, 16, 32, 8>
00019    {
00020    public:
00021       void encrypt_n(const byte in[], byte out[], size_t blocks) const;
00022       void decrypt_n(const byte in[], byte out[], size_t blocks) const;
00023 
00024       void clear();
00025       std::string name() const { return "Serpent"; }
00026       BlockCipher* clone() const { return new Serpent; }
00027    protected:
00028       /**
00029       * For use by subclasses using SIMD, asm, etc
00030       * @return const reference to the key schedule
00031       */
00032       const secure_vector<u32bit>& get_round_keys() const
00033          { return round_key; }
00034 
00035       /**
00036       * For use by subclasses that implement the key schedule
00037       * @param ks is the new key schedule value to set
00038       */
00039       void set_round_keys(const u32bit ks[132])
00040          {
00041          round_key.assign(&ks[0], &ks[132]);
00042          }
00043 
00044    private:
00045       void key_schedule(const byte key[], size_t length);
00046       secure_vector<u32bit> round_key;
00047    };
00048 
00049 }
00050 
00051 #endif