bn_mp_init.c 1.1 KB

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  1. #include <tommath.h>
  2. #ifdef BN_MP_INIT_C
  3. /* LibTomMath, multiple-precision integer library -- Tom St Denis
  4. *
  5. * LibTomMath is a library that provides multiple-precision
  6. * integer arithmetic as well as number theoretic functionality.
  7. *
  8. * The library was designed directly after the MPI library by
  9. * Michael Fromberger but has been written from scratch with
  10. * additional optimizations in place.
  11. *
  12. * The library is free for all purposes without any express
  13. * guarantee it works.
  14. *
  15. * Tom St Denis, tomstdenis@gmail.com, http://math.libtomcrypt.com
  16. */
  17. /* init a new mp_int */
  18. int mp_init (mp_int * a)
  19. {
  20. int i;
  21. /* allocate memory required and clear it */
  22. a->dp = OPT_CAST(mp_digit) XMALLOC (sizeof (mp_digit) * MP_PREC);
  23. if (a->dp == NULL) {
  24. return MP_MEM;
  25. }
  26. /* set the digits to zero */
  27. for (i = 0; i < MP_PREC; i++) {
  28. a->dp[i] = 0;
  29. }
  30. /* set the used to zero, allocated digits to the default precision
  31. * and sign to positive */
  32. a->used = 0;
  33. a->alloc = MP_PREC;
  34. a->sign = MP_ZPOS;
  35. return MP_OKAY;
  36. }
  37. #endif
  38. /* $Source: /cvs/libtom/libtommath/bn_mp_init.c,v $ */
  39. /* $Revision: 1.3 $ */
  40. /* $Date: 2006/03/31 14:18:44 $ */