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1/* mpi-internal.h - Internal to the Multi Precision Integers
2 * Copyright (C) 1994, 1996, 1998, 2000, 2002,
3 * 2003 Free Software Foundation, Inc.
4 *
5 * This file is part of Libgcrypt.
6 *
7 * Libgcrypt is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * Libgcrypt 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 Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License 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 */
27
28#ifndef G10_MPI_INTERNAL_H
29#define G10_MPI_INTERNAL_H
30
31#include "mpi-asm-defs.h"
32
33#ifndef BITS_PER_MPI_LIMB
34#if BYTES_PER_MPI_LIMB == SIZEOF_UNSIGNED_INT
35 typedef unsigned int mpi_limb_t;
36 typedef signed int mpi_limb_signed_t;
37#elif BYTES_PER_MPI_LIMB == SIZEOF_UNSIGNED_LONG
38 typedef unsigned long int mpi_limb_t;
39 typedef signed long int mpi_limb_signed_t;
40#elif BYTES_PER_MPI_LIMB == SIZEOF_UNSIGNED_LONG_LONG
41 typedef unsigned long long int mpi_limb_t;
42 typedef signed long long int mpi_limb_signed_t;
43#elif BYTES_PER_MPI_LIMB == SIZEOF_UNSIGNED_SHORT
44 typedef unsigned short int mpi_limb_t;
45 typedef signed short int mpi_limb_signed_t;
46#else
47#error BYTES_PER_MPI_LIMB does not match any C type
48#endif
49#define BITS_PER_MPI_LIMB (8*BYTES_PER_MPI_LIMB)
50#endif /*BITS_PER_MPI_LIMB*/
51
52#include "mpi.h"
53
54/* If KARATSUBA_THRESHOLD is not already defined, define it to a
55 * value which is good on most machines. */
56
57/* tested 4, 16, 32 and 64, where 16 gave the best performance when
58 * checking a 768 and a 1024 bit ElGamal signature.
59 * (wk 22.12.97) */
60#ifndef KARATSUBA_THRESHOLD
61#define KARATSUBA_THRESHOLD 16
62#endif
63
64/* The code can't handle KARATSUBA_THRESHOLD smaller than 2. */
65#if KARATSUBA_THRESHOLD < 2
66#undef KARATSUBA_THRESHOLD
67#define KARATSUBA_THRESHOLD 2
68#endif
69
70
71typedef mpi_limb_t *mpi_ptr_t; /* pointer to a limb */
72typedef int mpi_size_t; /* (must be a signed type) */
73
74#define ABS(x) (x >= 0 ? x : -x)
75#define MIN(l,o) ((l) < (o) ? (l) : (o))
76#define MAX(h,i) ((h) > (i) ? (h) : (i))
77#define RESIZE_IF_NEEDED(a,b) \
78 do { \
79 if( (a)->alloced < (b) ) \
80 mpi_resize((a), (b)); \
81 } while(0)
82
83/* Copy N limbs from S to D. */
84#define MPN_COPY( d, s, n) \
85 do { \
86 mpi_size_t _i; \
87 for( _i = 0; _i < (n); _i++ )\
88 (d)[_i] = (s)[_i]; \
89 } while(0)
90
91 #define MPN_COPY_INCR( d, s, n) \
92 do { \
93 mpi_size_t _i; \
94 for( _i = 0; _i < (n); _i++ )\
95 (d)[_i] = (d)[_i]; \
96 } while (0)
97
98#define MPN_COPY_DECR( d, s, n ) \
99 do { \
100 mpi_size_t _i; \
101 for( _i = (n)-1; _i >= 0; _i--) \
102 (d)[_i] = (s)[_i]; \
103 } while(0)
104
105/* Zero N limbs at D */
106#define MPN_ZERO(d, n) \
107 do { \
108 int _i; \
109 for( _i = 0; _i < (n); _i++ ) \
110 (d)[_i] = 0; \
111 } while (0)
112
113#define MPN_NORMALIZE(d, n) \
114 do { \
115 while( (n) > 0 ) { \
116 if( (d)[(n)-1] ) \
117 break; \
118 (n)--; \
119 } \
120 } while(0)
121
122#define MPN_NORMALIZE_NOT_ZERO(d, n) \
123 do { \
124 for(;;) { \
125 if( (d)[(n)-1] ) \
126 break; \
127 (n)--; \
128 } \
129 } while(0)
130
131#define MPN_MUL_N_RECURSE(prodp, up, vp, size, tspace) \
132 do { \
133 if( (size) < KARATSUBA_THRESHOLD ) \
134 mul_n_basecase (prodp, up, vp, size);\
135 else \
136 mul_n (prodp, up, vp, size, tspace);\
137 } while (0);
138
139
140/* Divide the two-limb number in (NH,,NL) by D, with DI being the largest
141 * limb not larger than (2**(2*BITS_PER_MP_LIMB))/D - (2**BITS_PER_MP_LIMB).
142 * If this would yield overflow, DI should be the largest possible number
143 * (i.e., only ones). For correct operation, the most significant bit of D
144 * has to be set. Put the quotient in Q and the remainder in R.
145 */
146#define UDIV_QRNND_PREINV(q, r, nh, nl, d, di) \
147 do { \
148 mpi_limb_t _q, _ql, _r; \
149 mpi_limb_t _xh, _xl; \
150 umul_ppmm (_q, _ql, (nh), (di)); \
151 _q += (nh);/* DI is 2**BITS_PER_MPI_LIMB too small */ \
152 umul_ppmm (_xh, _xl, _q, (d)); \
153 sub_ddmmss (_xh, _r, (nh), (nl), _xh, _xl); \
154 if( _xh ) { \
155 sub_ddmmss (_xh, _r, _xh, _r, 0, (d)); \
156 _q++; \
157 if( _xh) { \
158 sub_ddmmss (_xh, _r, _xh, _r, 0, (d)); \
159 _q++; \
160 } \
161 } \
162 if( _r >= (d) ) { \
163 _r -= (d); \
164 _q++; \
165 } \
166 (r) = _r; \
167 (q) = _q; \
168 } while (0)
169
170
171/*-- mpiutil.c --*/
172#define mpi_alloc_limb_space(n,f) _gcry_mpi_alloc_limb_space((n),(f))
173mpi_ptr_t _gcry_mpi_alloc_limb_space( unsigned nlimbs, int sec );
174void _gcry_mpi_free_limb_space( mpi_ptr_t a, unsigned int nlimbs );
175void _gcry_mpi_assign_limb_space( gcry_mpi_t a, mpi_ptr_t ap, unsigned nlimbs );
176
177/*-- mpi-bit.c --*/
178void _gcry_mpi_rshift_limbs( gcry_mpi_t a, unsigned int count );
179void _gcry_mpi_lshift_limbs( gcry_mpi_t a, unsigned int count );
180
181
182/*-- mpih-add.c --*/
183mpi_limb_t _gcry_mpih_add_1(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
184 mpi_size_t s1_size, mpi_limb_t s2_limb );
185mpi_limb_t _gcry_mpih_add_n( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
186 mpi_ptr_t s2_ptr, mpi_size_t size);
187mpi_limb_t _gcry_mpih_add(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
188 mpi_ptr_t s2_ptr, mpi_size_t s2_size);
189
190/*-- mpih-sub.c --*/
191mpi_limb_t _gcry_mpih_sub_1( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
192 mpi_size_t s1_size, mpi_limb_t s2_limb );
193mpi_limb_t _gcry_mpih_sub_n( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
194 mpi_ptr_t s2_ptr, mpi_size_t size);
195mpi_limb_t _gcry_mpih_sub(mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr, mpi_size_t s1_size,
196 mpi_ptr_t s2_ptr, mpi_size_t s2_size);
197
198/*-- mpih-cmp.c --*/
199int _gcry_mpih_cmp( mpi_ptr_t op1_ptr, mpi_ptr_t op2_ptr, mpi_size_t size );
200
201/*-- mpih-mul.c --*/
202
203struct karatsuba_ctx {
204 struct karatsuba_ctx *next;
205 mpi_ptr_t tspace;
206 unsigned int tspace_nlimbs;
207 mpi_size_t tspace_size;
208 mpi_ptr_t tp;
209 unsigned int tp_nlimbs;
210 mpi_size_t tp_size;
211};
212
213void _gcry_mpih_release_karatsuba_ctx( struct karatsuba_ctx *ctx );
214
215mpi_limb_t _gcry_mpih_addmul_1( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
216 mpi_size_t s1_size, mpi_limb_t s2_limb);
217mpi_limb_t _gcry_mpih_submul_1( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
218 mpi_size_t s1_size, mpi_limb_t s2_limb);
219void _gcry_mpih_mul_n( mpi_ptr_t prodp, mpi_ptr_t up, mpi_ptr_t vp,
220 mpi_size_t size);
221mpi_limb_t _gcry_mpih_mul( mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t usize,
222 mpi_ptr_t vp, mpi_size_t vsize);
223void _gcry_mpih_sqr_n_basecase( mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size );
224void _gcry_mpih_sqr_n( mpi_ptr_t prodp, mpi_ptr_t up, mpi_size_t size,
225 mpi_ptr_t tspace);
226
227void _gcry_mpih_mul_karatsuba_case( mpi_ptr_t prodp,
228 mpi_ptr_t up, mpi_size_t usize,
229 mpi_ptr_t vp, mpi_size_t vsize,
230 struct karatsuba_ctx *ctx );
231
232
233/*-- mpih-mul_1.c (or xxx/cpu/ *.S) --*/
234mpi_limb_t _gcry_mpih_mul_1( mpi_ptr_t res_ptr, mpi_ptr_t s1_ptr,
235 mpi_size_t s1_size, mpi_limb_t s2_limb);
236
237/*-- mpih-div.c --*/
238mpi_limb_t _gcry_mpih_mod_1(mpi_ptr_t dividend_ptr, mpi_size_t dividend_size,
239 mpi_limb_t divisor_limb);
240mpi_limb_t _gcry_mpih_divrem( mpi_ptr_t qp, mpi_size_t qextra_limbs,
241 mpi_ptr_t np, mpi_size_t nsize,
242 mpi_ptr_t dp, mpi_size_t dsize);
243mpi_limb_t _gcry_mpih_divmod_1( mpi_ptr_t quot_ptr,
244 mpi_ptr_t dividend_ptr, mpi_size_t dividend_size,
245 mpi_limb_t divisor_limb);
246
247/*-- mpih-shift.c --*/
248mpi_limb_t _gcry_mpih_lshift( mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
249 unsigned cnt);
250mpi_limb_t _gcry_mpih_rshift( mpi_ptr_t wp, mpi_ptr_t up, mpi_size_t usize,
251 unsigned cnt);
252
253
254/* Define stuff for longlong.h. */
255#define W_TYPE_SIZE BITS_PER_MPI_LIMB
256 typedef mpi_limb_t UWtype;
257 typedef unsigned int UHWtype;
258#if defined (__GNUC__)
259 typedef unsigned int UQItype __attribute__ ((mode (QI)));
260 typedef int SItype __attribute__ ((mode (SI)));
261 typedef unsigned int USItype __attribute__ ((mode (SI)));
262 typedef int DItype __attribute__ ((mode (DI)));
263 typedef unsigned int UDItype __attribute__ ((mode (DI)));
264#else
265 typedef unsigned char UQItype;
266 typedef long SItype;
267 typedef unsigned long USItype;
268#endif
269
270#ifdef __GNUC__
271#include "mpi-inline.h"
272#endif
273
274#endif /*G10_MPI_INTERNAL_H*/
275