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+/* mpi.h - Multi Precision Integers
+ * Copyright (C) 1994, 1996, 1998, 1999,
+ * 2000, 2001 Free Software Foundation, Inc.
+ *
+ * This file is part of GNUPG.
+ *
+ * GNUPG 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.
+ *
+ * GNUPG 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 <config.h>
+#include <stdio.h>
+#include "iobuf.h"
+#include "types.h"
+#include "memory.h"
+
+#if BYTES_PER_MPI_LIMB == SIZEOF_UNSIGNED_INT
+ typedef unsigned int mpi_limb_t;
+ typedef signed int mpi_limb_signed_t;
+#elif BYTES_PER_MPI_LIMB == SIZEOF_UNSIGNED_LONG
+ typedef unsigned long int mpi_limb_t;
+ typedef signed long int mpi_limb_signed_t;
+#elif BYTES_PER_MPI_LIMB == SIZEOF_UNSIGNED_LONG_LONG
+ typedef unsigned long long int mpi_limb_t;
+ typedef signed long long int mpi_limb_signed_t;
+#elif BYTES_PER_MPI_LIMB == SIZEOF_UNSIGNED_SHORT
+ typedef unsigned short int mpi_limb_t;
+ typedef signed short int mpi_limb_signed_t;
+#else
+ #error BYTES_PER_MPI_LIMB does not match any C type
+#endif
+#define BITS_PER_MPI_LIMB (8*BYTES_PER_MPI_LIMB)
+
+#ifndef EXTERN_UNLESS_MAIN_MODULE
+ #if defined (__riscos__) && !defined (INCLUDED_BY_MAIN_MODULE)
+ #define EXTERN_UNLESS_MAIN_MODULE extern
+ #else
+ #define EXTERN_UNLESS_MAIN_MODULE
+ #endif
+#endif
+
+#define DBG_MPI mpi_debug_mode
+EXTERN_UNLESS_MAIN_MODULE int mpi_debug_mode;
+
+
+struct gcry_mpi {
+ 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 */
+ unsigned flags; /* bit 0: array must be allocated in secure memory space */
+ /* bit 1: the mpi is encrypted */
+ /* bit 2: the limb is a pointer to some m_alloced data */
+ mpi_limb_t *d; /* array with the limbs */
+};
+
+typedef struct gcry_mpi *MPI;
+
+#define MPI_NULL NULL
+
+#define mpi_get_nlimbs(a) ((a)->nlimbs)
+#define mpi_get_nbit_info(a) ((a)->nbits)
+#define mpi_set_nbit_info(a,b) ((a)->nbits = (b))
+#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_alloc_like(n) mpi_debug_alloc_like((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 );
+ MPI mpi_debug_alloc_like( MPI a, 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 );
+ MPI mpi_alloc_like( MPI a );
+ void mpi_free( MPI a );
+ void mpi_resize( MPI a, unsigned nlimbs );
+ MPI mpi_copy( MPI a );
+#endif
+#define mpi_is_opaque(a) ((a) && ((a)->flags&4))
+MPI mpi_set_opaque( MPI a, void *p, int len );
+void *mpi_get_opaque( MPI a, int *len );
+#define mpi_is_protected(a) ((a) && ((a)->flags&2))
+#define mpi_set_protect_flag(a) ((a)->flags |= 2)
+#define mpi_clear_protect_flag(a) ((a)->flags &= ~2)
+#define mpi_is_secure(a) ((a) && ((a)->flags&1))
+void mpi_set_secure( MPI a );
+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
+MPI mpi_read_from_buffer(byte *buffer, unsigned *ret_nread, int secure);
+int mpi_fromstr(MPI val, const char *str);
+int mpi_print( FILE *fp, MPI a, int mode );
+void g10_log_mpidump( const char *text, MPI a );
+u32 mpi_get_keyid( MPI a, u32 *keyid );
+byte *mpi_get_buffer( MPI a, unsigned *nbytes, int *sign );
+byte *mpi_get_secure_buffer( MPI a, unsigned *nbytes, int *sign );
+void mpi_set_buffer( MPI a, const byte *buffer, unsigned nbytes, int sign );
+
+#define log_mpidump g10_log_mpidump
+
+/*-- 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-mpow.c --*/
+void mpi_mulpowm( MPI res, MPI *basearray, MPI *exparray, 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 idx );
+void mpi_putbyte( MPI a, unsigned idx, int value );
+unsigned mpi_trailing_zeros( MPI a );
+
+/*-- mpi-bit.c --*/
+void mpi_normalize( MPI a );
+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_highbit( MPI a, unsigned n );
+void mpi_clear_bit( MPI a, unsigned n );
+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*/