rc5-ref.hh

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/*
 *    Copyright (c) 2012-2014 Luxembourg University,
 *    Laboratory of Algorithmics, Cryptology and Security (LACS).
 *
 *    This file is part of the YAARX toolkit. YAARX stands for
 *    Yet Another ARX toolkit for analysis of ARX cryptographic algorithms.
 *
 *    YAARX is free software: you can redistribute it and/or modify
 *    it under the terms of the GNU General Public License as published by
 *    the Free Software Foundation, either version 3 of the License, or
 *    (at your option) any later version.
 *
 *    YAARX 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 General Public License for more details.
 *
 *    You should have received a copy of the GNU General Public License
 *    along with YAARX.  If not, see <http://www.gnu.org/licenses/>.
 */
#ifndef RC5_REF_H
#define RC5_REF_H

#define RC5_ROT_MASK (WORD_SIZE - 1)            // mask that selects the log2(2^{WORD_SIZE}) LS bits 

#define RC5_ROTL(x,y) (((x)<<(y & (WORD_SIZE-1))) | ((x)>>(WORD_SIZE - (y & (WORD_SIZE-1)))))
#define RC5_ROTR(x,y) (((x)>>(y & (WORD_SIZE-1))) | ((x)<<(WORD_SIZE - (y & (WORD_SIZE-1)))))

#if ((WORD_SIZE == 16) || (WORD_SIZE == 32) || (WORD_SIZE == 64))

#define RC5_NROUNDS_R      NROUNDS//12             /* r: number of rounds                  */  
#define RC5_KEY_NBYTES_B   16             /* b: number of bytes in key            */
#define RC5_STAB_LEN_T   26             /* t: size of table S = 2*(r+1) words   */
//#define RC5_STAB_LEN_T     (2 * (RC5_NROUNDS_R + 1))             /* t: size of table S = 2*(r+1) words   */

#if (WORD_SIZE == 64)
#define RC5_KEY_NWORDS_C    2             /* c: number  words in key = ceil(8*b/w)*/
#endif // #if (WORD_SIZE == 64)
#if (WORD_SIZE == 32)
#define RC5_KEY_NWORDS_C    4             /* c: number  words in key = ceil(8*b/w)*/
#endif // #if (WORD_SIZE == 32)
#if (WORD_SIZE == 16)
#define RC5_KEY_NWORDS_C    8             /* c: number  words in key = ceil(8*b/w)*/
#endif // #if (WORD_SIZE == 16)

extern WORD_T RC5_CONST_P; /* magic constant P: defined in rc5-ref.cc */
extern WORD_T RC5_CONST_Q; /* magic constant Q: defined in rc5-ref.cc  */

void rc5_encrypt(uint32_t nrounds, const WORD_T S[RC5_STAB_LEN_T], WORD_T *pt, WORD_T *ct); /* 2 WORD_T input pt/output ct    */
void rc5_decrypt(uint32_t nrounds, const WORD_T S[RC5_STAB_LEN_T], WORD_T *ct, WORD_T *pt); /* 2 WORD_T input pt/output ct    */
void rc5_xor_encrypt(uint32_t nrounds, const WORD_T S[RC5_STAB_LEN_T], WORD_T *pt, WORD_T *ct);
//void rc5_setup(unsigned char *K, WORD_T S[RC5_STAB_LEN_T]); /* secret input key K[0...b-1]      */
void rc5_setup(const unsigned char *K, WORD_T S[RC5_STAB_LEN_T]); /* secret input key K[0...b-1]      */

#endif // #if ((WORD_SIZE == 16) || (WORD_SIZE == 32) || (WORD_SIZE == 64))
#endif  // #ifndef RC5_REF_H