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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 <linux/types.h>
  
  /* DSI defines */
  
  #define SHA1_DIGEST_LENGTH   20
  
  /*end of DSI defines */
  
  #define BYTES_PER_MPI_LIMB	(BITS_PER_LONG / 8)
  #define BITS_PER_MPI_LIMB	BITS_PER_LONG
  
  typedef unsigned long int mpi_limb_t;
  typedef signed long int mpi_limb_signed_t;
  
  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: not used */
  	/* 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_get_nlimbs(a)     ((a)->nlimbs)
  #define mpi_is_neg(a)	      ((a)->sign)
  
  /*-- mpiutil.c --*/
  MPI mpi_alloc(unsigned nlimbs);
  MPI mpi_alloc_secure(unsigned nlimbs);
  MPI mpi_alloc_like(MPI a);
  void mpi_free(MPI a);
  int mpi_resize(MPI a, unsigned nlimbs);
  int mpi_copy(MPI *copy, const MPI a);
  void mpi_clear(MPI a);
  int mpi_set(MPI w, MPI u);
  int 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 --*/
  MPI do_encode_md(const void *sha_buffer, unsigned nbits);
  MPI mpi_read_raw_data(const void *xbuffer, size_t nbytes);
  MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);
  int mpi_fromstr(MPI val, const char *str);
  u32 mpi_get_keyid(MPI a, u32 *keyid);
  void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign);
  void *mpi_get_secure_buffer(MPI a, unsigned *nbytes, int *sign);
  int mpi_set_buffer(MPI a, const void *buffer, unsigned nbytes, int sign);
  
  #define log_mpidump g10_log_mpidump
  
  /*-- mpi-add.c --*/
  int mpi_add_ui(MPI w, MPI u, ulong v);
  int mpi_add(MPI w, MPI u, MPI v);
  int mpi_addm(MPI w, MPI u, MPI v, MPI m);
  int mpi_sub_ui(MPI w, MPI u, ulong v);
  int mpi_sub(MPI w, MPI u, MPI v);
  int mpi_subm(MPI w, MPI u, MPI v, MPI m);
  
  /*-- mpi-mul.c --*/
  int mpi_mul_ui(MPI w, MPI u, ulong v);
  int mpi_mul_2exp(MPI w, MPI u, ulong cnt);
  int mpi_mul(MPI w, MPI u, MPI v);
  int mpi_mulm(MPI w, MPI u, MPI v, MPI m);
  
  /*-- mpi-div.c --*/
  ulong mpi_fdiv_r_ui(MPI rem, MPI dividend, ulong divisor);
  int mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor);
  int mpi_fdiv_q(MPI quot, MPI dividend, MPI divisor);
  int mpi_fdiv_qr(MPI quot, MPI rem, MPI dividend, MPI divisor);
  int mpi_tdiv_r(MPI rem, MPI num, MPI den);
  int mpi_tdiv_qr(MPI quot, MPI rem, MPI num, MPI den);
  int mpi_tdiv_q_2exp(MPI w, MPI u, unsigned count);
  int mpi_divisible_ui(const MPI dividend, ulong divisor);
  
  /*-- mpi-gcd.c --*/
  int mpi_gcd(MPI g, const MPI a, const MPI b);
  
  /*-- mpi-pow.c --*/
  int mpi_pow(MPI w, MPI u, MPI v);
  int mpi_powm(MPI res, MPI base, MPI exp, MPI mod);
  
  /*-- mpi-mpow.c --*/
  int 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);
  int mpi_set_bit(MPI a, unsigned n);
  int mpi_set_highbit(MPI a, unsigned n);
  void mpi_clear_highbit(MPI a, unsigned n);
  void mpi_clear_bit(MPI a, unsigned n);
  int mpi_rshift(MPI x, MPI a, unsigned n);
  
  /*-- mpi-inv.c --*/
  int mpi_invm(MPI x, MPI u, MPI v);
  
  #endif /*G10_MPI_H */