1f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include <tommath.h> 2f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef BN_MP_COPY_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/* copy, b = a */ 19f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectint 20f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectmp_copy (mp_int * a, mp_int * b) 21f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project{ 22f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int res, n; 23f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 24f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* if dst == src do nothing */ 25f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (a == b) { 26f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return MP_OKAY; 27f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 28f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 29f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* grow dest */ 30f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (b->alloc < a->used) { 31f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((res = mp_grow (b, a->used)) != MP_OKAY) { 32f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return res; 33f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 34f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 35f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 36f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* zero b and copy the parameters over */ 37f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project { 38f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project register mp_digit *tmpa, *tmpb; 39f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 40f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* pointer aliases */ 41f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 42f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* source */ 43f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project tmpa = a->dp; 44f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 45f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* destination */ 46f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project tmpb = b->dp; 47f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 48f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* copy all the digits */ 49f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project for (n = 0; n < a->used; n++) { 50f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *tmpb++ = *tmpa++; 51f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 52f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 53f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* clear high digits */ 54f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project for (; n < b->used; n++) { 55f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project *tmpb++ = 0; 56f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 57f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 58f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 59f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* copy used count and sign */ 60f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project b->used = a->used; 61f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project b->sign = a->sign; 62f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return MP_OKAY; 63f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project} 64f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 65f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 66f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Source: /cvs/libtom/libtommath/bn_mp_copy.c,v $ */ 67f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Revision: 1.3 $ */ 68f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Date: 2006/03/31 14:18:44 $ */ 69