1 #include <tommath.h> 2 #ifdef BN_MP_TO_UNSIGNED_BIN_C 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis 4 * 5 * LibTomMath is a library that provides multiple-precision 6 * integer arithmetic as well as number theoretic functionality. 7 * 8 * The library was designed directly after the MPI library by 9 * Michael Fromberger but has been written from scratch with 10 * additional optimizations in place. 11 * 12 * The library is free for all purposes without any express 13 * guarantee it works. 14 * 15 * Tom St Denis, tomstdenis (at) gmail.com, http://math.libtomcrypt.com 16 */ 17 18 /* store in unsigned [big endian] format */ 19 int mp_to_unsigned_bin (mp_int * a, unsigned char *b) 20 { 21 int x, res; 22 mp_int t; 23 24 if ((res = mp_init_copy (&t, a)) != MP_OKAY) { 25 return res; 26 } 27 28 x = 0; 29 while (mp_iszero (&t) == 0) { 30 #ifndef MP_8BIT 31 b[x++] = (unsigned char) (t.dp[0] & 255); 32 #else 33 b[x++] = (unsigned char) (t.dp[0] | ((t.dp[1] & 0x01) << 7)); 34 #endif 35 if ((res = mp_div_2d (&t, 8, &t, NULL)) != MP_OKAY) { 36 mp_clear (&t); 37 return res; 38 } 39 } 40 bn_reverse (b, x); 41 mp_clear (&t); 42 return MP_OKAY; 43 } 44 #endif 45 46 /* $Source: /cvs/libtom/libtommath/bn_mp_to_unsigned_bin.c,v $ */ 47 /* $Revision: 1.3 $ */ 48 /* $Date: 2006/03/31 14:18:44 $ */ 49
