2 #ifdef BN_MP_TORADIX_N_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
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.
12 * The library is free for all purposes without any express
15 * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
18 /* stores a bignum as a ASCII string in a given radix (2..64)
20 * Stores upto maxlen-1 chars and always a NULL byte
22 int mp_toradix_n(mp_int * a, char *str, int radix, int maxlen)
29 /* check range of the maxlen, radix */
30 if (maxlen < 2 || radix < 2 || radix > 64) {
34 /* quick out if its zero */
35 if (mp_iszero(a) == MP_YES) {
41 if ((res = mp_init_copy (&t, a)) != MP_OKAY) {
45 /* if it is negative output a - */
46 if (t.sign == MP_NEG) {
47 /* we have to reverse our digits later... but not the - sign!! */
50 /* store the flag and mark the number as positive */
59 while (mp_iszero (&t) == 0) {
64 if ((res = mp_div_d (&t, (mp_digit) radix, &t, &d)) != MP_OKAY) {
68 *str++ = mp_s_rmap[d];
72 /* reverse the digits of the string. In this case _s points
73 * to the first digit [exluding the sign] of the number
75 bn_reverse ((unsigned char *)_s, digs);
77 /* append a NULL so the string is properly terminated */
86 /* $Source: /cvs/libtom/libtommath/bn_mp_toradix_n.c,v $ */
87 /* $Revision: 1.4 $ */
88 /* $Date: 2006/03/31 14:18:44 $ */