c3-lang/libtommath/bn_mp_to_unsigned_bin.c

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• Hash : 8b2daf78
  Author :
  Date : 2019-05-19T17:16:13
  

  always use varname err with mp_err

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• bn_mp_to_unsigned_bin.c

• #include "tommath_private.h"
  #ifdef BN_MP_TO_UNSIGNED_BIN_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* store in unsigned [big endian] format */
  mp_err mp_to_unsigned_bin(const mp_int *a, unsigned char *b)
  {
     int     x;
     mp_err  err;
     mp_int  t;
  
     if ((err = mp_init_copy(&t, a)) != MP_OKAY) {
        return err;
     }
  
     x = 0;
     while (!MP_IS_ZERO(&t)) {
  #ifndef MP_8BIT
        b[x++] = (unsigned char)(t.dp[0] & 255u);
  #else
        b[x++] = (unsigned char)(t.dp[0] | ((t.dp[1] & 1u) << 7));
  #endif
        if ((err = mp_div_2d(&t, 8, &t, NULL)) != MP_OKAY) {
           mp_clear(&t);
           return err;
        }
     }
     s_mp_reverse(b, x);
     mp_clear(&t);
     return MP_OKAY;
  }
  #endif
  

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