include/linux/mpi.h

   1 /* mpi.h  -  Multi Precision Integers
   2  *      Copyright (C) 1994, 1996, 1998, 1999,
   3  *                    2000, 2001 Free Software Foundation, Inc.
   4  *
   5  * This file is part of GNUPG.
   6  *
   7  * GNUPG is free software; you can redistribute it and/or modify
   8  * it under the terms of the GNU General Public License as published by
   9  * the Free Software Foundation; either version 2 of the License, or
  10  * (at your option) any later version.
  11  *
  12  * GNUPG is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU General Public License
  18  * along with this program; if not, write to the Free Software
  19  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
  20  *
  21  * Note: This code is heavily based on the GNU MP Library.
  22  *       Actually it's the same code with only minor changes in the
  23  *       way the data is stored; this is to support the abstraction
  24  *       of an optional secure memory allocation which may be used
  25  *       to avoid revealing of sensitive data due to paging etc.
  26  *       The GNU MP Library itself is published under the LGPL;
  27  *       however I decided to publish this code under the plain GPL.
  28  */
  29
  30 #ifndef G10_MPI_H
  31 #define G10_MPI_H
  32
  33 #include <linux/types.h>
  34
  35 /* DSI defines */
  36
  37 #define SHA1_DIGEST_LENGTH   20
  38
  39 /*end of DSI defines */
  40
  41 #define BYTES_PER_MPI_LIMB      (BITS_PER_LONG / 8)
  42 #define BITS_PER_MPI_LIMB       BITS_PER_LONG
  43
  44 typedef unsigned long int mpi_limb_t;
  45 typedef signed long int mpi_limb_signed_t;
  46
  47 struct gcry_mpi {
  48         int alloced;            /* array size (# of allocated limbs) */
  49         int nlimbs;             /* number of valid limbs */
  50         int nbits;              /* the real number of valid bits (info only) */
  51         int sign;               /* indicates a negative number */
  52         unsigned flags;         /* bit 0: array must be allocated in secure memory space */
  53         /* bit 1: not used */
  54         /* bit 2: the limb is a pointer to some m_alloced data */
  55         mpi_limb_t *d;          /* array with the limbs */
  56 };
  57
  58 typedef struct gcry_mpi *MPI;
  59
  60 #define mpi_get_nlimbs(a)     ((a)->nlimbs)
  61 #define mpi_is_neg(a)         ((a)->sign)
  62
  63 /*-- mpiutil.c --*/
  64 MPI mpi_alloc(unsigned nlimbs);
  65 MPI mpi_alloc_secure(unsigned nlimbs);
  66 MPI mpi_alloc_like(MPI a);
  67 void mpi_free(MPI a);
  68 int mpi_resize(MPI a, unsigned nlimbs);
  69 int mpi_copy(MPI *copy, const MPI a);
  70 void mpi_clear(MPI a);
  71 int mpi_set(MPI w, MPI u);
  72 int mpi_set_ui(MPI w, ulong u);
  73 MPI mpi_alloc_set_ui(unsigned long u);
  74 void mpi_m_check(MPI a);
  75 void mpi_swap(MPI a, MPI b);
  76
  77 /*-- mpicoder.c --*/
  78 MPI do_encode_md(const void *sha_buffer, unsigned nbits);
  79 MPI mpi_read_from_buffer(const void *buffer, unsigned *ret_nread);
  80 int mpi_fromstr(MPI val, const char *str);
  81 u32 mpi_get_keyid(MPI a, u32 *keyid);
  82 void *mpi_get_buffer(MPI a, unsigned *nbytes, int *sign);
  83 void *mpi_get_secure_buffer(MPI a, unsigned *nbytes, int *sign);
  84 int mpi_set_buffer(MPI a, const void *buffer, unsigned nbytes, int sign);
  85
  86 #define log_mpidump g10_log_mpidump
  87
  88 /*-- mpi-add.c --*/
  89 int mpi_add_ui(MPI w, MPI u, ulong v);
  90 int mpi_add(MPI w, MPI u, MPI v);
  91 int mpi_addm(MPI w, MPI u, MPI v, MPI m);
  92 int mpi_sub_ui(MPI w, MPI u, ulong v);
  93 int mpi_sub(MPI w, MPI u, MPI v);
  94 int mpi_subm(MPI w, MPI u, MPI v, MPI m);
  95
  96 /*-- mpi-mul.c --*/
  97 int mpi_mul_ui(MPI w, MPI u, ulong v);
  98 int mpi_mul_2exp(MPI w, MPI u, ulong cnt);
  99 int mpi_mul(MPI w, MPI u, MPI v);
 100 int mpi_mulm(MPI w, MPI u, MPI v, MPI m);
 101
 102 /*-- mpi-div.c --*/
 103 ulong mpi_fdiv_r_ui(MPI rem, MPI dividend, ulong divisor);
 104 int mpi_fdiv_r(MPI rem, MPI dividend, MPI divisor);
 105 int mpi_fdiv_q(MPI quot, MPI dividend, MPI divisor);
 106 int mpi_fdiv_qr(MPI quot, MPI rem, MPI dividend, MPI divisor);
 107 int mpi_tdiv_r(MPI rem, MPI num, MPI den);
 108 int mpi_tdiv_qr(MPI quot, MPI rem, MPI num, MPI den);
 109 int mpi_tdiv_q_2exp(MPI w, MPI u, unsigned count);
 110 int mpi_divisible_ui(const MPI dividend, ulong divisor);
 111
 112 /*-- mpi-gcd.c --*/
 113 int mpi_gcd(MPI g, const MPI a, const MPI b);
 114
 115 /*-- mpi-pow.c --*/
 116 int mpi_pow(MPI w, MPI u, MPI v);
 117 int mpi_powm(MPI res, MPI base, MPI exp, MPI mod);
 118
 119 /*-- mpi-mpow.c --*/
 120 int mpi_mulpowm(MPI res, MPI *basearray, MPI *exparray, MPI mod);
 121
 122 /*-- mpi-cmp.c --*/
 123 int mpi_cmp_ui(MPI u, ulong v);
 124 int mpi_cmp(MPI u, MPI v);
 125
 126 /*-- mpi-scan.c --*/
 127 int mpi_getbyte(MPI a, unsigned idx);
 128 void mpi_putbyte(MPI a, unsigned idx, int value);
 129 unsigned mpi_trailing_zeros(MPI a);
 130
 131 /*-- mpi-bit.c --*/
 132 void mpi_normalize(MPI a);
 133 unsigned mpi_get_nbits(MPI a);
 134 int mpi_test_bit(MPI a, unsigned n);
 135 int mpi_set_bit(MPI a, unsigned n);
 136 int mpi_set_highbit(MPI a, unsigned n);
 137 void mpi_clear_highbit(MPI a, unsigned n);
 138 void mpi_clear_bit(MPI a, unsigned n);
 139 int mpi_rshift(MPI x, MPI a, unsigned n);
 140
 141 /*-- mpi-inv.c --*/
 142 int mpi_invm(MPI x, MPI u, MPI v);
 143
 144 #endif /*G10_MPI_H */