text: /* LibTomMath, multiple-precision integer library -- Tom St Denis
   *
   * LibTomMath is a library that provides multiple-precision
   * integer arithmetic as well as number theoretic functionality.
   *
   * The library was designed directly after the MPI library by
   * Michael Fromberger but has been written from scratch with
   * additional optimizations in place.
   *
   * SPDX-License-Identifier: Unlicense
   */
  #ifndef TOMMATH_PRIV_H_
  #define TOMMATH_PRIV_H_
  
  #include "tommath.h"
  #include <ctype.h>
  
  #ifndef MIN
  #define MIN(x, y) (((x) < (y)) ? (x) : (y))
  #endif
  
  #ifndef MAX
  #define MAX(x, y) (((x) > (y)) ? (x) : (y))
  #endif
  
  #ifdef __cplusplus
  extern "C" {
  
  /* C++ compilers don't like assigning void * to mp_digit * */
  #define OPT_CAST(x) (x *)
  
  #else
  
  /* C on the other hand doesn't care */
  #define OPT_CAST(x)
  
  #endif
  
  /* define heap macros */
  #ifndef XMALLOC
  /* default to libc stuff */
  #   define XMALLOC   malloc
  #   define XFREE     free
  #   define XREALLOC  realloc
  #   define XCALLOC   calloc
  #else
  /* prototypes for our heap functions */
  extern void *XMALLOC(size_t n);
  extern void *XREALLOC(void *p, size_t n);
  extern void *XCALLOC(size_t n, size_t s);
  extern void XFREE(void *p);
  #endif
  
  /* lowlevel functions, do not call! */
  int s_mp_add(const mp_int *a, const mp_int *b, mp_int *c);
  int s_mp_sub(const mp_int *a, const mp_int *b, mp_int *c);
  #define s_mp_mul(a, b, c) s_mp_mul_digs(a, b, c, (a)->used + (b)->used + 1)
  int fast_s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs);
  int s_mp_mul_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs);
  int fast_s_mp_mul_high_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs);
  int s_mp_mul_high_digs(const mp_int *a, const mp_int *b, mp_int *c, int digs);
  int fast_s_mp_sqr(const mp_int *a, mp_int *b);
  int s_mp_sqr(const mp_int *a, mp_int *b);
  int mp_karatsuba_mul(const mp_int *a, const mp_int *b, mp_int *c);
  int mp_toom_mul(const mp_int *a, const mp_int *b, mp_int *c);
  int mp_karatsuba_sqr(const mp_int *a, mp_int *b);
  int mp_toom_sqr(const mp_int *a, mp_int *b);
  int fast_mp_invmod(const mp_int *a, const mp_int *b, mp_int *c);
  int mp_invmod_slow(const mp_int *a, const mp_int *b, mp_int *c);
  int fast_mp_montgomery_reduce(mp_int *x, const mp_int *n, mp_digit rho);
  int mp_exptmod_fast(const mp_int *G, const mp_int *X, const mp_int *P, mp_int *Y, int redmode);
  int s_mp_exptmod(const mp_int *G, const mp_int *X, const mp_int *P, mp_int *Y, int redmode);
  void bn_reverse(unsigned char *s, int len);
  
  extern const char *const mp_s_rmap;
  extern const uint8_t mp_s_rmap_reverse[];
  extern const size_t mp_s_rmap_reverse_sz;
  
  /* Fancy macro to set an MPI from another type.
   * There are several things assumed:
   *  x is the counter and unsigned
   *  a is the pointer to the MPI
   *  b is the original value that should be set in the MPI.
   */
  #define MP_SET_XLONG(func_name, type)                    \
  int func_name (mp_int * a, type b)                       \
  {                                                        \
    unsigned int  x;                                       \
    int           res;                                     \
                                                           \
    mp_zero (a);                                           \
                                                           \
    /* set four bits at a time */                          \
    for (x = 0; x < (sizeof(type) * 2u); x++) {            \
      /* shift the number up four bits */                  \
      if ((res = mp_mul_2d (a, 4, a)) != MP_OKAY) {        \
        return res;                                        \
      }                                                    \
                                                           \
      /* OR in the top four bits of the source */          \
      a->dp[0] |= (mp_digit)(b >> ((sizeof(type) * 8u) - 4u)) & 15uL;\
                                                           \
      /* shift the source up to the next four bits */      \
      b <<= 4;                                             \
                                                           \
      /* ensure that digits are not clamped off */         \
      a->used += 1;                                        \
    }                                                      \
    mp_clamp (a);                                          \
    return MP_OKAY;                                        \
  }
  
  #ifdef __cplusplus
  }
  #endif
  
  #endif
  
  
  /* ref:         $Format:%D$ */
  /* git commit:  $Format:%H$ */
  /* commit time: $Format:%ai$ */
  