kc3-lang/libtommath/bn_mp_read_signed_bin.c

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• Hash : 4534056c
  Author :
  Date : 2019-05-13T00:22:18
  

  use enums mp_err, mp_ord, mp_bool, mp_sign * MP_USE_ENUMS enables enums * Wc++-compat catches some implicit conversions if MP_USE_ENUMS is defined * 100% backwards compatible API/ABI if MP_USE_ENUMS is not defined

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• bn_mp_read_signed_bin.c

• #include "tommath_private.h"
  #ifdef BN_MP_READ_SIGNED_BIN_C
  /* LibTomMath, multiple-precision integer library -- Tom St Denis */
  /* SPDX-License-Identifier: Unlicense */
  
  /* read signed bin, big endian, first byte is 0==positive or 1==negative */
  mp_err mp_read_signed_bin(mp_int *a, const unsigned char *b, int c)
  {
     mp_err res;
  
     /* read magnitude */
     if ((res = mp_read_unsigned_bin(a, b + 1, c - 1)) != MP_OKAY) {
        return res;
     }
  
     /* first byte is 0 for positive, non-zero for negative */
     if (b[0] == (unsigned char)0) {
        a->sign = MP_ZPOS;
     } else {
        a->sign = MP_NEG;
     }
  
     return MP_OKAY;
  }
  #endif
  

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