1f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include <tommath.h> 2f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef BN_MP_SQR_C 3f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* LibTomMath, multiple-precision integer library -- Tom St Denis 4f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 5f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * LibTomMath is a library that provides multiple-precision 6f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * integer arithmetic as well as number theoretic functionality. 7f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 8f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * The library was designed directly after the MPI library by 9f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Michael Fromberger but has been written from scratch with 10f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * additional optimizations in place. 11f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 12f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * The library is free for all purposes without any express 13f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * guarantee it works. 14f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * 15f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com 16f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project */ 17f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 18f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* computes b = a*a */ 19f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectint 20f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectmp_sqr (mp_int * a, mp_int * b) 21f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project{ 22f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int res; 23f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 24f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef BN_MP_TOOM_SQR_C 25f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* use Toom-Cook? */ 26f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (a->used >= TOOM_SQR_CUTOFF) { 27f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project res = mp_toom_sqr(a, b); 28f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* Karatsuba? */ 29f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } else 30f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 31f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef BN_MP_KARATSUBA_SQR_C 32f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectif (a->used >= KARATSUBA_SQR_CUTOFF) { 33f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project res = mp_karatsuba_sqr (a, b); 34f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } else 35f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 36f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project { 37f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef BN_FAST_S_MP_SQR_C 38f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* can we use the fast comba multiplier? */ 39f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((a->used * 2 + 1) < MP_WARRAY && 40f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project a->used < 41f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project (1 << (sizeof(mp_word) * CHAR_BIT - 2*DIGIT_BIT - 1))) { 42f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project res = fast_s_mp_sqr (a, b); 43f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } else 44f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 45f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef BN_S_MP_SQR_C 46f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project res = s_mp_sqr (a, b); 47f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#else 48f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project res = MP_VAL; 49f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 50f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 51f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project b->sign = MP_ZPOS; 52f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return res; 53f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project} 54f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 55f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 56f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Source: /cvs/libtom/libtommath/bn_mp_sqr.c,v $ */ 57f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Revision: 1.3 $ */ 58f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Date: 2006/03/31 14:18:44 $ */ 59