1 /* mpi-internal.h - Internal to the Multi Precision Integers
2 * Copyright (C) 1994, 1996 Free Software Foundation, Inc.
3 * Copyright (C) 1998, 2000 Free Software Foundation, Inc.
5 * This file is part of GnuPG.
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.
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.
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
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.
30 #ifndef G10_MPI_INTERNAL_H
31 #define G10_MPI_INTERNAL_H
33 #include <linux/kernel.h>
34 #include <linux/slab.h>
35 #include <linux/string.h>
36 #include <linux/crypto/mpi.h>
37 #include <asm/errno.h>
39 #define log_debug printk
40 #define log_bug printk
42 #define assert(x) do { \
43 if (!x) log_bug("failed assertion\n"); \
46 /* If KARATSUBA_THRESHOLD is not already defined, define it to a
47 * value which is good on most machines. */
49 /* tested 4, 16, 32 and 64, where 16 gave the best performance when
50 * checking a 768 and a 1024 bit ElGamal signature.
52 #ifndef KARATSUBA_THRESHOLD
53 #define KARATSUBA_THRESHOLD 16
56 /* The code can't handle KARATSUBA_THRESHOLD smaller than 2. */
57 #if KARATSUBA_THRESHOLD < 2
58 #undef KARATSUBA_THRESHOLD
59 #define KARATSUBA_THRESHOLD 2
63 typedef mpi_limb_t *mpi_ptr_t; /* pointer to a limb */
64 typedef int mpi_size_t; /* (must be a signed type) */
66 #define ABS(x) (x >= 0 ? x : -x)
67 #define MIN(l,o) ((l) < (o) ? (l) : (o))
68 #define MAX(h,i) ((h) > (i) ? (h) : (i))
70 static inline int RESIZE_IF_NEEDED(MPI a, unsigned b)
73 return mpi_resize(a,b);
77 /* Copy N limbs from S to D. */
78 #define MPN_COPY( d, s, n) \
81 for( _i = 0; _i < (n); _i++ ) \
85 #define MPN_COPY_INCR( d, s, n) \
88 for( _i = 0; _i < (n); _i++ ) \
92 #define MPN_COPY_DECR( d, s, n ) \
95 for( _i = (n)-1; _i >= 0; _i--) \
99 /* Zero N limbs at D */
100 #define MPN_ZERO(d, n) \
103 for( _i = 0; _i < (n); _i++ ) \
107 #define MPN_NORMALIZE(d, n) \
116 #define MPN_NORMALIZE_NOT_ZERO(d, n) \
125 #define MPN_MUL_N_RECURSE(prodp, up, vp, size, tspace) \
127 if( (size) < KARATSUBA_THRESHOLD ) \
128 mul_n_basecase (prodp, up, vp, size); \
130 mul_n (prodp, up, vp, size, tspace); \
134 /* Divide the two-limb number in (NH,,NL) by D, with DI being the largest
135 * limb not larger than (2**(2*BITS_PER_MP_LIMB))/D - (2**BITS_PER_MP_LIMB).
136 * If this would yield overflow, DI should be the largest possible number
137 * (i.e., only ones). For correct operation, the most significant bit of D
138 * has to be set. Put the quotient in Q and the remainder in R.
140 #define UDIV_QRNND_PREINV(q, r, nh, nl, d, di) \
142 mpi_limb_t _q, _ql, _r; \
143 mpi_limb_t _xh, _xl; \
144 umul_ppmm (_q, _ql, (nh), (di)); \
145 _q += (nh); /* DI is 2**BITS_PER_MPI_LIMB too small */ \
146 umul_ppmm (_xh, _xl, _q, (d)); \
147 sub_ddmmss (_xh, _r, (nh), (nl), _xh, _xl); \
149 sub_ddmmss (_xh, _r, _xh, _r, 0, (d)); \
152 sub_ddmmss (_xh, _r, _xh, _r, 0, (d)); \
166 mpi_ptr_t mpi_alloc_limb_space( unsigned nlimbs );
167 void mpi_free_limb_space( mpi_ptr_t a );
168 void mpi_assign_limb_space( MPI a, mpi_ptr_t ap, unsigned nlimbs );
171 void mpi_rshift_limbs( MPI a, unsigned int count );
172 int mpi_lshift_limbs( MPI a, unsigned int count );
175 /*-- mpihelp-add.c --*/
176 mpi_limb_t mpihelp_add_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
177 mpi_size_t s1_size, mpi_limb_t s2_limb );
178 mpi_limb_t mpihelp_add_n( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
179 mpi_ptr_t s2_ptr, mpi_size_t size);
180 mpi_limb_t mpihelp_add(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
181 mpi_ptr_t s2_ptr, mpi_size_t s2_size);
183 /*-- mpihelp-sub.c --*/
184 mpi_limb_t mpihelp_sub_1( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
185 mpi_size_t s1_size, mpi_limb_t s2_limb );
186 mpi_limb_t mpihelp_sub_n( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
187 mpi_ptr_t s2_ptr, mpi_size_t size);
188 mpi_limb_t mpihelp_sub(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
189 mpi_ptr_t s2_ptr, mpi_size_t s2_size);
191 /*-- mpihelp-cmp.c --*/
192 int mpihelp_cmp( mpi_ptr_t op1_ptr, mpi_ptr_t op2_ptr, mpi_size_t size );
194 /*-- mpihelp-mul.c --*/
196 struct karatsuba_ctx {
197 struct karatsuba_ctx *next;
199 mpi_size_t tspace_size;
204 void mpihelp_release_karatsuba_ctx( struct karatsuba_ctx *ctx );
206 mpi_limb_t mpihelp_addmul_1( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
207 mpi_size_t s1_size, mpi_limb_t s2_limb);
208 mpi_limb_t mpihelp_submul_1( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
209 mpi_size_t s1_size, mpi_limb_t s2_limb);
210 int mpihelp_mul_n( mpi_ptr_t prodp, mpi_ptr_t up, mpi_ptr_t vp,
212 int mpihelp_mul( mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t usize,
213 mpi_ptr_t vp, mpi_size_t vsize, mpi_limb_t *_result);
214 void mpih_sqr_n_basecase( mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size );
215 void mpih_sqr_n( mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size,
218 int mpihelp_mul_karatsuba_case( mpi_ptr_t prodp,
219 mpi_ptr_t up, mpi_size_t usize,
220 mpi_ptr_t vp, mpi_size_t vsize,
221 struct karatsuba_ctx *ctx );
224 /*-- mpihelp-mul_1.c (or xxx/cpu/ *.S) --*/
225 mpi_limb_t mpihelp_mul_1( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
226 mpi_size_t s1_size, mpi_limb_t s2_limb);
228 /*-- mpihelp-div.c --*/
229 mpi_limb_t mpihelp_mod_1(mpi_ptr_t dividend_ptr, mpi_size_t dividend_size,
230 mpi_limb_t divisor_limb);
231 mpi_limb_t mpihelp_divrem( mpi_ptr_t qp, mpi_size_t qextra_limbs,
232 mpi_ptr_t np, mpi_size_t nsize,
233 mpi_ptr_t dp, mpi_size_t dsize);
234 mpi_limb_t mpihelp_divmod_1( mpi_ptr_t quot_ptr,
235 mpi_ptr_t dividend_ptr, mpi_size_t dividend_size,
236 mpi_limb_t divisor_limb);
238 /*-- mpihelp-shift.c --*/
239 mpi_limb_t mpihelp_lshift( mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
241 mpi_limb_t mpihelp_rshift( mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
245 /* Define stuff for longlong.h. */
246 #define W_TYPE_SIZE BITS_PER_MPI_LIMB
247 typedef mpi_limb_t UWtype;
248 typedef unsigned int UHWtype;
249 #if defined (__GNUC__)
250 typedef unsigned int UQItype __attribute__ ((mode (QI)));
251 typedef int SItype __attribute__ ((mode (SI)));
252 typedef unsigned int USItype __attribute__ ((mode (SI)));
253 typedef int DItype __attribute__ ((mode (DI)));
254 typedef unsigned int UDItype __attribute__ ((mode (DI)));
256 typedef unsigned char UQItype;
258 typedef unsigned long USItype;
262 #include "mpi-inline.h"
265 #endif /*G10_MPI_INTERNAL_H*/