53 lines
1.2 KiB
C
53 lines
1.2 KiB
C
#include "tommath_private.h"
|
|
#ifdef BN_MP_READ_UNSIGNED_BIN_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
|
|
*/
|
|
|
|
/* reads a unsigned char array, assumes the msb is stored first [big endian] */
|
|
int mp_read_unsigned_bin(mp_int *a, const unsigned char *b, int c)
|
|
{
|
|
int res;
|
|
|
|
/* make sure there are at least two digits */
|
|
if (a->alloc < 2) {
|
|
if ((res = mp_grow(a, 2)) != MP_OKAY) {
|
|
return res;
|
|
}
|
|
}
|
|
|
|
/* zero the int */
|
|
mp_zero(a);
|
|
|
|
/* read the bytes in */
|
|
while (c-- > 0) {
|
|
if ((res = mp_mul_2d(a, 8, a)) != MP_OKAY) {
|
|
return res;
|
|
}
|
|
|
|
#ifndef MP_8BIT
|
|
a->dp[0] |= *b++;
|
|
a->used += 1;
|
|
#else
|
|
a->dp[0] = (*b & MP_MASK);
|
|
a->dp[1] |= ((*b++ >> 7) & 1u);
|
|
a->used += 2;
|
|
#endif
|
|
}
|
|
mp_clamp(a);
|
|
return MP_OKAY;
|
|
}
|
|
#endif
|
|
|
|
/* ref: $Format:%D$ */
|
|
/* git commit: $Format:%H$ */
|
|
/* commit time: $Format:%ai$ */
|