30 lines
764 B
C
30 lines
764 B
C
#include "tommath_private.h"
|
|
#ifdef BN_MP_GET_LONG_LONG_C
|
|
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
|
|
/* SPDX-License-Identifier: Unlicense */
|
|
|
|
/* get the lower unsigned long long of an mp_int, platform dependent */
|
|
unsigned long long mp_get_long_long(const mp_int *a)
|
|
{
|
|
int i;
|
|
unsigned long long res;
|
|
|
|
if (IS_ZERO(a)) {
|
|
return 0;
|
|
}
|
|
|
|
/* get number of digits of the lsb we have to read */
|
|
i = MIN(a->used, (((CHAR_BIT * (int)sizeof(unsigned long long)) + DIGIT_BIT - 1) / DIGIT_BIT)) - 1;
|
|
|
|
/* get most significant digit of result */
|
|
res = (unsigned long long)a->dp[i];
|
|
|
|
#if DIGIT_BIT < 64
|
|
while (--i >= 0) {
|
|
res = (res << DIGIT_BIT) | (unsigned long long)a->dp[i];
|
|
}
|
|
#endif
|
|
return res;
|
|
}
|
|
#endif
|