kc3-lang/libtommath/mp_from_ubin.c

• Show log

  Commit

• Hash : 7a68f128
  Author :
  Date : 2019-10-19T16:24:39
  

  Execute move.sh - Rename files from bn_* to match the function names. * git blame <renamed-file> is not affected * git log --follow <renamed-file> can be used to show log across renames

Download

• mp_from_ubin.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
  

Download