]>
git.proxmox.com Git - mirror_ubuntu-zesty-kernel.git/blob - lib/mpi/mpi-internal.h
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/module.h>
34 #include <linux/kernel.h>
35 #include <linux/slab.h>
36 #include <linux/string.h>
37 #include <linux/mpi.h>
38 #include <linux/errno.h>
40 #define log_debug printk
41 #define log_bug printk
46 log_bug("failed assertion\n"); \
49 /* If KARATSUBA_THRESHOLD is not already defined, define it to a
50 * value which is good on most machines. */
52 /* tested 4, 16, 32 and 64, where 16 gave the best performance when
53 * checking a 768 and a 1024 bit ElGamal signature.
55 #ifndef KARATSUBA_THRESHOLD
56 #define KARATSUBA_THRESHOLD 16
59 /* The code can't handle KARATSUBA_THRESHOLD smaller than 2. */
60 #if KARATSUBA_THRESHOLD < 2
61 #undef KARATSUBA_THRESHOLD
62 #define KARATSUBA_THRESHOLD 2
65 typedef mpi_limb_t
*mpi_ptr_t
; /* pointer to a limb */
66 typedef int mpi_size_t
; /* (must be a signed type) */
68 static inline int RESIZE_IF_NEEDED(MPI a
, unsigned b
)
71 return mpi_resize(a
, b
);
75 /* Copy N limbs from S to D. */
76 #define MPN_COPY(d, s, n) \
79 for (_i = 0; _i < (n); _i++) \
83 #define MPN_COPY_INCR(d, s, n) \
86 for (_i = 0; _i < (n); _i++) \
90 #define MPN_COPY_DECR(d, s, n) \
93 for (_i = (n)-1; _i >= 0; _i--) \
97 /* Zero N limbs at D */
98 #define MPN_ZERO(d, n) \
101 for (_i = 0; _i < (n); _i++) \
105 #define MPN_NORMALIZE(d, n) \
114 #define MPN_NORMALIZE_NOT_ZERO(d, n) \
123 #define MPN_MUL_N_RECURSE(prodp, up, vp, size, tspace) \
125 if ((size) < KARATSUBA_THRESHOLD) \
126 mul_n_basecase(prodp, up, vp, size); \
128 mul_n(prodp, up, vp, size, tspace); \
131 /* Divide the two-limb number in (NH,,NL) by D, with DI being the largest
132 * limb not larger than (2**(2*BITS_PER_MP_LIMB))/D - (2**BITS_PER_MP_LIMB).
133 * If this would yield overflow, DI should be the largest possible number
134 * (i.e., only ones). For correct operation, the most significant bit of D
135 * has to be set. Put the quotient in Q and the remainder in R.
137 #define UDIV_QRNND_PREINV(q, r, nh, nl, d, di) \
139 mpi_limb_t _q, _ql, _r; \
140 mpi_limb_t _xh, _xl; \
141 umul_ppmm(_q, _ql, (nh), (di)); \
142 _q += (nh); /* DI is 2**BITS_PER_MPI_LIMB too small */ \
143 umul_ppmm(_xh, _xl, _q, (d)); \
144 sub_ddmmss(_xh, _r, (nh), (nl), _xh, _xl); \
146 sub_ddmmss(_xh, _r, _xh, _r, 0, (d)); \
149 sub_ddmmss(_xh, _r, _xh, _r, 0, (d)); \
162 mpi_ptr_t
mpi_alloc_limb_space(unsigned nlimbs
);
163 void mpi_free_limb_space(mpi_ptr_t a
);
164 void mpi_assign_limb_space(MPI a
, mpi_ptr_t ap
, unsigned nlimbs
);
167 void mpi_rshift_limbs(MPI a
, unsigned int count
);
168 int mpi_lshift_limbs(MPI a
, unsigned int count
);
170 /*-- mpihelp-add.c --*/
171 mpi_limb_t
mpihelp_add_1(mpi_ptr_t res_ptr
, mpi_ptr_t s1_ptr
,
172 mpi_size_t s1_size
, mpi_limb_t s2_limb
);
173 mpi_limb_t
mpihelp_add_n(mpi_ptr_t res_ptr
, mpi_ptr_t s1_ptr
,
174 mpi_ptr_t s2_ptr
, mpi_size_t size
);
175 mpi_limb_t
mpihelp_add(mpi_ptr_t res_ptr
, mpi_ptr_t s1_ptr
, mpi_size_t s1_size
,
176 mpi_ptr_t s2_ptr
, mpi_size_t s2_size
);
178 /*-- mpihelp-sub.c --*/
179 mpi_limb_t
mpihelp_sub_1(mpi_ptr_t res_ptr
, mpi_ptr_t s1_ptr
,
180 mpi_size_t s1_size
, mpi_limb_t s2_limb
);
181 mpi_limb_t
mpihelp_sub_n(mpi_ptr_t res_ptr
, mpi_ptr_t s1_ptr
,
182 mpi_ptr_t s2_ptr
, mpi_size_t size
);
183 mpi_limb_t
mpihelp_sub(mpi_ptr_t res_ptr
, mpi_ptr_t s1_ptr
, mpi_size_t s1_size
,
184 mpi_ptr_t s2_ptr
, mpi_size_t s2_size
);
186 /*-- mpihelp-cmp.c --*/
187 int mpihelp_cmp(mpi_ptr_t op1_ptr
, mpi_ptr_t op2_ptr
, mpi_size_t size
);
189 /*-- mpihelp-mul.c --*/
191 struct karatsuba_ctx
{
192 struct karatsuba_ctx
*next
;
194 mpi_size_t tspace_size
;
199 void mpihelp_release_karatsuba_ctx(struct karatsuba_ctx
*ctx
);
201 mpi_limb_t
mpihelp_addmul_1(mpi_ptr_t res_ptr
, mpi_ptr_t s1_ptr
,
202 mpi_size_t s1_size
, mpi_limb_t s2_limb
);
203 mpi_limb_t
mpihelp_submul_1(mpi_ptr_t res_ptr
, mpi_ptr_t s1_ptr
,
204 mpi_size_t s1_size
, mpi_limb_t s2_limb
);
205 int mpihelp_mul_n(mpi_ptr_t prodp
, mpi_ptr_t up
, mpi_ptr_t vp
, mpi_size_t size
);
206 int mpihelp_mul(mpi_ptr_t prodp
, mpi_ptr_t up
, mpi_size_t usize
,
207 mpi_ptr_t vp
, mpi_size_t vsize
, mpi_limb_t
*_result
);
208 void mpih_sqr_n_basecase(mpi_ptr_t prodp
, mpi_ptr_t up
, mpi_size_t size
);
209 void mpih_sqr_n(mpi_ptr_t prodp
, mpi_ptr_t up
, mpi_size_t size
,
212 int mpihelp_mul_karatsuba_case(mpi_ptr_t prodp
,
213 mpi_ptr_t up
, mpi_size_t usize
,
214 mpi_ptr_t vp
, mpi_size_t vsize
,
215 struct karatsuba_ctx
*ctx
);
217 /*-- mpihelp-mul_1.c (or xxx/cpu/ *.S) --*/
218 mpi_limb_t
mpihelp_mul_1(mpi_ptr_t res_ptr
, mpi_ptr_t s1_ptr
,
219 mpi_size_t s1_size
, mpi_limb_t s2_limb
);
221 /*-- mpihelp-div.c --*/
222 mpi_limb_t
mpihelp_mod_1(mpi_ptr_t dividend_ptr
, mpi_size_t dividend_size
,
223 mpi_limb_t divisor_limb
);
224 mpi_limb_t
mpihelp_divrem(mpi_ptr_t qp
, mpi_size_t qextra_limbs
,
225 mpi_ptr_t np
, mpi_size_t nsize
,
226 mpi_ptr_t dp
, mpi_size_t dsize
);
227 mpi_limb_t
mpihelp_divmod_1(mpi_ptr_t quot_ptr
,
228 mpi_ptr_t dividend_ptr
, mpi_size_t dividend_size
,
229 mpi_limb_t divisor_limb
);
231 /*-- mpihelp-shift.c --*/
232 mpi_limb_t
mpihelp_lshift(mpi_ptr_t wp
, mpi_ptr_t up
, mpi_size_t usize
,
234 mpi_limb_t
mpihelp_rshift(mpi_ptr_t wp
, mpi_ptr_t up
, mpi_size_t usize
,
237 /* Define stuff for longlong.h. */
238 #define W_TYPE_SIZE BITS_PER_MPI_LIMB
239 typedef mpi_limb_t UWtype
;
240 typedef unsigned int UHWtype
;
241 #if defined(__GNUC__)
242 typedef unsigned int UQItype
__attribute__ ((mode(QI
)));
243 typedef int SItype
__attribute__ ((mode(SI
)));
244 typedef unsigned int USItype
__attribute__ ((mode(SI
)));
245 typedef int DItype
__attribute__ ((mode(DI
)));
246 typedef unsigned int UDItype
__attribute__ ((mode(DI
)));
248 typedef unsigned char UQItype
;
250 typedef unsigned long USItype
;
254 #include "mpi-inline.h"
257 #endif /*G10_MPI_INTERNAL_H */