libtommath/bn_mp_get_double.c
2019-04-25 13:39:50 +02:00

19 lines
436 B
C

#include "tommath_private.h"
#ifdef BN_MP_GET_DOUBLE_C
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
/* SPDX-License-Identifier: Unlicense */
double mp_get_double(const mp_int *a)
{
int i;
double d = 0.0, fac = 1.0;
for (i = 0; i < MP_DIGIT_BIT; ++i) {
fac *= 2.0;
}
for (i = a->used; i --> 0;) {
d = (d * fac) + (double)a->dp[i];
}
return (a->sign == MP_NEG) ? -d : d;
}
#endif