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dsa-internal.h

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  • aes-internal.h 2.66 KiB
    /* aes-internal.h
     *
     * The aes/rijndael block cipher.
     */
    
    /* nettle, low-level cryptographics library
     *
     * Copyright (C) 2001 Niels Möller
     *  
     * The nettle library is free software; you can redistribute it and/or modify
     * it under the terms of the GNU Lesser General Public License as published by
     * the Free Software Foundation; either version 2.1 of the License, or (at your
     * option) any later version.
     * 
     * The nettle library is distributed in the hope that it will be useful, but
     * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
     * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
     * License for more details.
     * 
     * You should have received a copy of the GNU Lesser General Public License
     * along with the nettle library; see the file COPYING.LIB.  If not, write to
     * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
     * MA 02111-1301, USA.
     */
    
    #ifndef NETTLE_AES_INTERNAL_H_INCLUDED
    #define NETTLE_AES_INTERNAL_H_INCLUDED
    
    #include "aes.h"
    
    /* Name mangling */
    #define _aes_encrypt _nettle_aes_encrypt
    #define _aes_decrypt _nettle_aes_decrypt
    #define _aes_encrypt_table _nettle_aes_encrypt_table
    
    /* Define to use only small tables. */
    #ifndef AES_SMALL
    # define AES_SMALL 0
    #endif
    
    #if AES_SMALL
    # define AES_TABLE_SIZE 1
    #else
    # define AES_TABLE_SIZE 4
    #endif
    
    struct aes_table
    {
      uint8_t sbox[0x100];
      uint32_t table[AES_TABLE_SIZE][0x100];
    };
    
    void
    _aes_encrypt(const struct aes_ctx *ctx,
    	     const struct aes_table *T,
    	     size_t length, uint8_t *dst,
    	     const uint8_t *src);
    
    void
    _aes_decrypt(const struct aes_ctx *ctx,
    	     const struct aes_table *T,
    	     size_t length, uint8_t *dst,
    	     const uint8_t *src);
    
    /* Macros */
    /* Get the byte with index 0, 1, 2 and 3 */
    #define B0(x) ((x) & 0xff)
    #define B1(x) (((x) >> 8) & 0xff)
    #define B2(x) (((x) >> 16) & 0xff)
    #define B3(x) (((x) >> 24) & 0xff)
    
    #define SUBBYTE(x, box) ((uint32_t)(box)[B0(x)]		\
    		      | ((uint32_t)(box)[B1(x)] << 8)	\
    		      | ((uint32_t)(box)[B2(x)] << 16)	\
    		      | ((uint32_t)(box)[B3(x)] << 24))
    
    #define AES_ROUND(T, w0, w1, w2, w3, k)		\
    ((  T->table[0][ B0(w0) ]			\
      ^ T->table[1][ B1(w1) ]			\
      ^ T->table[2][ B2(w2) ]			\
      ^ T->table[3][ B3(w3) ]) ^ (k))
    
    #define AES_FINAL_ROUND(T, w0, w1, w2, w3, k)		\
    ((   (uint32_t) T->sbox[ B0(w0) ]			\
      | ((uint32_t) T->sbox[ B1(w1) ] << 8)			\
      | ((uint32_t) T->sbox[ B2(w2) ] << 16)		\
      | ((uint32_t) T->sbox[ B3(w3) ] << 24)) ^ (k))
         
    /* Globally visible so that the same sbox table can be used by aes_set_encrypt_key */
    
    extern const struct aes_table _aes_encrypt_table;
    #define aes_sbox (_aes_encrypt_table.sbox)
    
    #endif /* NETTLE_AES_INTERNAL_H_INCLUDED */