libtommath/mp_from_ubin.c
Daniel Mendler bcda8fc696
simplifications: remove unnecessary optimization
* these double checks are not necessary
* the compiler will move the early return outside of the called
  function, basically the functions is partially inlined
* however lto/amalgamation needed for the optimization
2019-11-04 15:41:33 +01:00

31 lines
699 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 uint8_t array, assumes the msb is stored first [big endian] */
mp_err mp_from_ubin(mp_int *a, const uint8_t *buf, size_t size)
{
mp_err err;
/* make sure there are at least two digits */
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