73 lines
1.7 KiB
C
73 lines
1.7 KiB
C
#include "tommath_private.h"
|
|
#ifdef BN_MP_TORADIX_C
|
|
/* LibTomMath, multiple-precision integer library -- Tom St Denis
|
|
*
|
|
* LibTomMath is a library that provides multiple-precision
|
|
* integer arithmetic as well as number theoretic functionality.
|
|
*
|
|
* The library was designed directly after the MPI library by
|
|
* Michael Fromberger but has been written from scratch with
|
|
* additional optimizations in place.
|
|
*
|
|
* SPDX-License-Identifier: Unlicense
|
|
*/
|
|
|
|
/* stores a bignum as a ASCII string in a given radix (2..64) */
|
|
int mp_toradix(const mp_int *a, char *str, int radix)
|
|
{
|
|
int res, digs;
|
|
mp_int t;
|
|
mp_digit d;
|
|
char *_s = str;
|
|
|
|
/* check range of the radix */
|
|
if ((radix < 2) || (radix > 64)) {
|
|
return MP_VAL;
|
|
}
|
|
|
|
/* quick out if its zero */
|
|
if (mp_iszero(a) == MP_YES) {
|
|
*str++ = '0';
|
|
*str = '\0';
|
|
return MP_OKAY;
|
|
}
|
|
|
|
if ((res = mp_init_copy(&t, a)) != MP_OKAY) {
|
|
return res;
|
|
}
|
|
|
|
/* if it is negative output a - */
|
|
if (t.sign == MP_NEG) {
|
|
++_s;
|
|
*str++ = '-';
|
|
t.sign = MP_ZPOS;
|
|
}
|
|
|
|
digs = 0;
|
|
while (mp_iszero(&t) == MP_NO) {
|
|
if ((res = mp_div_d(&t, (mp_digit)radix, &t, &d)) != MP_OKAY) {
|
|
mp_clear(&t);
|
|
return res;
|
|
}
|
|
*str++ = mp_s_rmap[d];
|
|
++digs;
|
|
}
|
|
|
|
/* reverse the digits of the string. In this case _s points
|
|
* to the first digit [exluding the sign] of the number]
|
|
*/
|
|
bn_reverse((unsigned char *)_s, digs);
|
|
|
|
/* append a NULL so the string is properly terminated */
|
|
*str = '\0';
|
|
|
|
mp_clear(&t);
|
|
return MP_OKAY;
|
|
}
|
|
|
|
#endif
|
|
|
|
/* ref: $Format:%D$ */
|
|
/* git commit: $Format:%H$ */
|
|
/* commit time: $Format:%ai$ */
|