forked from premiere/premiere-libtorrent
120 lines
4.2 KiB
C
120 lines
4.2 KiB
C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
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*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
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*
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* The library was designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
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* additional optimizations in place.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tstdenis82@gmail.com, http://math.libtomcrypt.com
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*/
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#ifndef TOMMATH_PRIV_H_
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#define TOMMATH_PRIV_H_
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#include "libtorrent/tommath.h"
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#include <ctype.h>
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#define MIN(x,y) (((x) < (y)) ? (x) : (y))
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#define MAX(x,y) (((x) > (y)) ? (x) : (y))
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#ifdef __cplusplus
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extern "C" {
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/* C++ compilers don't like assigning void * to mp_digit * */
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#define OPT_CAST(x) (x *)
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#else
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/* C on the other hand doesn't care */
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#define OPT_CAST(x)
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#endif
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/* define heap macros */
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#ifndef XMALLOC
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/* default to libc stuff */
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#define XMALLOC malloc
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#define XFREE free
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#define XREALLOC realloc
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#define XCALLOC calloc
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#else
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/* prototypes for our heap functions */
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extern void *XMALLOC(size_t n);
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extern void *XREALLOC(void *p, size_t n);
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extern void *XCALLOC(size_t n, size_t s);
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extern void XFREE(void *p);
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#endif
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/* lowlevel functions, do not call! */
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int s_mp_add(mp_int *a, mp_int *b, mp_int *c);
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int s_mp_sub(mp_int *a, mp_int *b, mp_int *c);
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#define s_mp_mul(a, b, c) s_mp_mul_digs(a, b, c, (a)->used + (b)->used + 1)
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int fast_s_mp_mul_digs(mp_int *a, mp_int *b, mp_int *c, int digs);
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int s_mp_mul_digs(mp_int *a, mp_int *b, mp_int *c, int digs);
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int fast_s_mp_mul_high_digs(mp_int *a, mp_int *b, mp_int *c, int digs);
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int s_mp_mul_high_digs(mp_int *a, mp_int *b, mp_int *c, int digs);
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int fast_s_mp_sqr(mp_int *a, mp_int *b);
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int s_mp_sqr(mp_int *a, mp_int *b);
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int mp_karatsuba_mul(mp_int *a, mp_int *b, mp_int *c);
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int mp_toom_mul(mp_int *a, mp_int *b, mp_int *c);
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int mp_karatsuba_sqr(mp_int *a, mp_int *b);
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int mp_toom_sqr(mp_int *a, mp_int *b);
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int fast_mp_invmod(mp_int *a, mp_int *b, mp_int *c);
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int mp_invmod_slow (mp_int * a, mp_int * b, mp_int * c);
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int fast_mp_montgomery_reduce(mp_int *x, mp_int *n, mp_digit rho);
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int mp_exptmod_fast(mp_int *G, mp_int *X, mp_int *P, mp_int *Y, int redmode);
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int s_mp_exptmod (mp_int * G, mp_int * X, mp_int * P, mp_int * Y, int redmode);
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void bn_reverse(unsigned char *s, int len);
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extern const char *mp_s_rmap;
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/* Fancy macro to set an MPI from another type.
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* There are several things assumed:
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* x is the counter and unsigned
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* a is the pointer to the MPI
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* b is the original value that should be set in the MPI.
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*/
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#define MP_SET_XLONG(func_name, type) \
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int func_name (mp_int * a, type b) \
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{ \
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unsigned int x; \
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int res; \
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\
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mp_zero (a); \
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\
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/* set four bits at a time */ \
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for (x = 0; x < (sizeof(type) * 2u); x++) { \
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/* shift the number up four bits */ \
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if ((res = mp_mul_2d (a, 4, a)) != MP_OKAY) { \
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return res; \
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} \
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\
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/* OR in the top four bits of the source */ \
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a->dp[0] |= (b >> ((sizeof(type) * 8u) - 4u)) & 15u; \
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\
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/* shift the source up to the next four bits */ \
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b <<= 4; \
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\
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/* ensure that digits are not clamped off */ \
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a->used += 1; \
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} \
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mp_clamp (a); \
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return MP_OKAY; \
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}
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#ifdef __cplusplus
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}
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#endif
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#endif
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/* $Source$ */
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/* $Revision$ */
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/* $Date$ */
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