33 lines
751 B
C
33 lines
751 B
C
#include "tommath_private.h"
|
|
#ifdef BN_MP_FROM_UBIN_C
|
|
/* LibTomMath, multiple-precision integer library -- Tom St Denis */
|
|
/* SPDX-License-Identifier: Unlicense */
|
|
|
|
/* reads a unsigned char array, assumes the msb is stored first [big endian] */
|
|
mp_err mp_from_ubin(mp_int *a, const unsigned char *buf, size_t size)
|
|
{
|
|
mp_err err;
|
|
|
|
/* make sure there are at least two digits */
|
|
if (a->alloc < 2) {
|
|
if ((err = mp_grow(a, 2)) != MP_OKAY) {
|
|
return err;
|
|
}
|
|
}
|
|
|
|
/* zero the int */
|
|
mp_zero(a);
|
|
|
|
/* read the bytes in */
|
|
while (size-- > 0u) {
|
|
if ((err = mp_mul_2d(a, 8, a)) != MP_OKAY) {
|
|
return err;
|
|
}
|
|
a->dp[0] |= *buf++;
|
|
a->used += 1;
|
|
}
|
|
mp_clamp(a);
|
|
return MP_OKAY;
|
|
}
|
|
#endif
|