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/* mpi.h - Multi Precision Integers
* Copyright (c) 1997 by Werner Koch (dd9jn)
* Copyright (C) 1994, 1996 Free Software Foundation, Inc.
*
* This file is part of G10.
*
* G10 is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* G10 is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*
* Note: This code is heavily based on the GNU MP Library.
* Actually it's the same code with only minor changes in the
* way the data is stored; this is to support the abstraction
* of an optional secure memory allocation which may be used
* to avoid revealing of sensitive data due to paging etc.
* The GNU MP Library itself is published under the LGPL;
* however I decided to publish this code under the plain GPL.
*/
#ifndef G10_MPI_H
#define G10_MPI_H
#include <stdio.h>
#include "iobuf.h"
#include "types.h"
#include "memory.h"
#define DBG_MPI mpi_debug_mode
int mpi_debug_mode;
#define BITS_PER_MPI_LIMB (8*SIZEOF_UNSIGNED_LONG)
#define BYTES_PER_MPI_LIMB SIZEOF_UNSIGNED_LONG
#define BYTES_PER_MPI_LIMB2 (2*SIZEOF_UNSIGNED_LONG)
typedef unsigned long int mpi_limb_t;
typedef signed long int mpi_limb_signed_t;
typedef struct mpi_struct {
int alloced; /* array size (# of allocated limbs) */
int nlimbs; /* number of valid limbs */
int nbits; /* the real number of valid bits (info only) */
int sign; /* indicates a negative number */
int secure; /* array must be allocated in secure memory space */
mpi_limb_t *d; /* array with the limbs */
} *MPI;
#define MPI_NULL NULL
#define mpi_get_nlimbs(a) ((a)->nlimbs)
#define mpi_is_neg(a) ((a)->sign)
/*-- mpiutil.c --*/
#ifdef M_DEBUG
#define mpi_alloc(n) mpi_debug_alloc((n), M_DBGINFO( __LINE__ ) )
#define mpi_alloc_secure(n) mpi_debug_alloc_secure((n), M_DBGINFO( __LINE__ ) )
#define mpi_free(a) mpi_debug_free((a), M_DBGINFO(__LINE__) )
#define mpi_resize(a,b) mpi_debug_resize((a),(b), M_DBGINFO(__LINE__) )
#define mpi_copy(a) mpi_debug_copy((a), M_DBGINFO(__LINE__) )
MPI mpi_debug_alloc( unsigned nlimbs, const char *info );
MPI mpi_debug_alloc_secure( unsigned nlimbs, const char *info );
void mpi_debug_free( MPI a, const char *info );
void mpi_debug_resize( MPI a, unsigned nlimbs, const char *info );
MPI mpi_debug_copy( MPI a, const char *info );
#else
MPI mpi_alloc( unsigned nlimbs );
MPI mpi_alloc_secure( unsigned nlimbs );
void mpi_free( MPI a );
void mpi_resize( MPI a, unsigned nlimbs );
MPI mpi_copy( MPI a );
#endif
void mpi_clear( MPI a );
void mpi_set( MPI w, MPI u);
void mpi_set_ui( MPI w, ulong u);
MPI mpi_alloc_set_ui( unsigned long u);
void mpi_m_check( MPI a );
void mpi_swap( MPI a, MPI b);
/*-- mpicoder.c --*/
int mpi_write( IOBUF out, MPI a );
#ifdef M_DEBUG
#define mpi_read(a,b,c) mpi_debug_read((a),(b),(c), M_DBGINFO( __LINE__ ) )
MPI mpi_debug_read(IOBUF inp, unsigned *nread, int secure, const char *info);
#else
MPI mpi_read(IOBUF inp, unsigned *nread, int secure);
#endif
int mpi_fromstr(MPI val, const char *str);
int mpi_print( FILE *fp, MPI a, int mode );
u32 mpi_get_keyid( MPI a, u32 *keyid );
byte *mpi_get_buffer( MPI a, unsigned *nbytes, int *sign );
void mpi_set_buffer( MPI a, const byte *buffer, unsigned nbytes, int sign );
/*-- mpi-add.c --*/
void mpi_add_ui(MPI w, MPI u, ulong v );
void mpi_add(MPI w, MPI u, MPI v);
void mpi_addm(MPI w, MPI u, MPI v, MPI m);
void mpi_sub_ui(MPI w, MPI u, ulong v );
void mpi_sub( MPI w, MPI u, MPI v);
void mpi_subm( MPI w, MPI u, MPI v, MPI m);
/*-- mpi-mul.c --*/
void mpi_mul_ui(MPI w, MPI u, ulong v );
void mpi_mul_2exp( MPI w, MPI u, ulong cnt);
void mpi_mul( MPI w, MPI u, MPI v);
void mpi_mulm( MPI w, MPI u, MPI v, MPI m);
/*-- mpi-div.c --*/
ulong mpi_fdiv_r_ui( MPI rem, MPI dividend, ulong divisor );
void mpi_fdiv_r( MPI rem, MPI dividend, MPI divisor );
void mpi_fdiv_q( MPI quot, MPI dividend, MPI divisor );
void mpi_fdiv_qr( MPI quot, MPI rem, MPI dividend, MPI divisor );
void mpi_tdiv_r( MPI rem, MPI num, MPI den);
void mpi_tdiv_qr( MPI quot, MPI rem, MPI num, MPI den);
void mpi_tdiv_q_2exp( MPI w, MPI u, unsigned count );
int mpi_divisible_ui(MPI dividend, ulong divisor );
/*-- mpi-gcd.c --*/
int mpi_gcd( MPI g, MPI a, MPI b );
/*-- mpi-pow.c --*/
void mpi_pow( MPI w, MPI u, MPI v);
void mpi_powm( MPI res, MPI base, MPI exp, MPI mod);
/*-- mpi-cmp.c --*/
int mpi_cmp_ui( MPI u, ulong v );
int mpi_cmp( MPI u, MPI v );
/*-- mpi-scan.c --*/
int mpi_getbyte( MPI a, unsigned index );
void mpi_putbyte( MPI a, unsigned index, int value );
unsigned mpi_trailing_zeros( MPI a );
/*-- mpi-bit.c --*/
unsigned mpi_get_nbits( MPI a );
int mpi_test_bit( MPI a, unsigned n );
void mpi_set_bit( MPI a, unsigned n );
void mpi_set_highbit( MPI a, unsigned n );
void mpi_clear_bit( MPI a, unsigned n );
void mpi_set_bytes( MPI a, unsigned nbits, byte (*fnc)(int), int opaque );
void mpi_rshift( MPI x, MPI a, unsigned n );
/*-- mpi-inv.c --*/
void mpi_invm( MPI x, MPI u, MPI v );
#endif /*G10_MPI_H*/
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