1f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#include <tommath.h> 2f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#ifdef BN_MP_READ_RADIX_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/* read a string [ASCII] in a given radix */ 19f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Projectint mp_read_radix (mp_int * a, const char *str, int radix) 20f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project{ 21f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project int y, res, neg; 22f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project char ch; 23f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 24f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* zero the digit bignum */ 25f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project mp_zero(a); 26f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 27f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* make sure the radix is ok */ 28f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (radix < 2 || radix > 64) { 29f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return MP_VAL; 30f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 31f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 32f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* if the leading digit is a 33f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * minus set the sign to negative. 34f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project */ 35f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (*str == '-') { 36f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project ++str; 37f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project neg = MP_NEG; 38f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } else { 39f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project neg = MP_ZPOS; 40f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 41f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 42f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* set the integer to the default of zero */ 43f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project mp_zero (a); 44f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 45f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* process each digit of the string */ 46f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project while (*str) { 47f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* if the radix < 36 the conversion is case insensitive 48f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * this allows numbers like 1AB and 1ab to represent the same value 49f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * [e.g. in hex] 50f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project */ 51f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project ch = (char) ((radix < 36) ? toupper (*str) : *str); 52f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project for (y = 0; y < 64; y++) { 53f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (ch == mp_s_rmap[y]) { 54f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project break; 55f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 56f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 57f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 58f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* if the char was found in the map 59f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * and is less than the given radix add it 60f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project * to the number, otherwise exit the loop. 61f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project */ 62f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (y < radix) { 63f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((res = mp_mul_d (a, (mp_digit) radix, a)) != MP_OKAY) { 64f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return res; 65f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 66f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if ((res = mp_add_d (a, (mp_digit) y, a)) != MP_OKAY) { 67f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return res; 68f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 69f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } else { 70f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project break; 71f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 72f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project ++str; 73f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 74f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 75f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project /* set the sign only if a != 0 */ 76f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project if (mp_iszero(a) != 1) { 77f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project a->sign = neg; 78f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project } 79f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project return MP_OKAY; 80f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project} 81f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project#endif 82f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project 83f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Source: /cvs/libtom/libtommath/bn_mp_read_radix.c,v $ */ 84f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Revision: 1.4 $ */ 85f7fc46c63fdc8f39234fea409b8dbe116d73ebf8The Android Open Source Project/* $Date: 2006/03/31 14:18:44 $ */ 86