libtommath/mp_from_ubin.c
Steffen Jaeckel 7a68f12873 Execute move.sh - Rename files from bn_* to match the function names.
* git blame <renamed-file> is not affected
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2019-10-19 16:24:39 +02:00

33 lines
748 B
C

#include "tommath_private.h"
#ifdef 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