kc3-lang/libtommath/bn_mp_from_ubin.c

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• Hash : 763b40b4
  Author :
  Date : 2019-10-06T15:24:17
  

  use same parameter name as in the prototype

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• bn_mp_from_ubin.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;
        }
  
  #ifndef MP_8BIT
        a->dp[0] |= *buf++;
        a->used += 1;
  #else
        a->dp[0] = (*buf & MP_MASK);
        a->dp[1] |= ((*buf++ >> 7) & 1u);
        a->used += 2;
  #endif
     }
     mp_clamp(a);
     return MP_OKAY;
  }
  #endif
  

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