1 /* crypto/bn/bn_lcl.h */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
58 /* ====================================================================
59 * Copyright (c) 1998-2000 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
112 #ifndef HEADER_BN_LCL_H
113 #define HEADER_BN_LCL_H
115 #include <openssl/bn.h>
122 /* Used for temp variables */
123 #define BN_CTX_NUM 32
124 #define BN_CTX_NUM_POS 12
128 BIGNUM bn[BN_CTX_NUM];
131 int pos[BN_CTX_NUM_POS];
137 * BN_window_bits_for_exponent_size -- macro for sliding window mod_exp functions
140 * For window size 'w' (w >= 2) and a random 'b' bits exponent,
141 * the number of multiplications is a constant plus on average
143 * 2^(w-1) + (b-w)/(w+1);
145 * here 2^(w-1) is for precomputing the table (we actually need
146 * entries only for windows that have the lowest bit set), and
147 * (b-w)/(w+1) is an approximation for the expected number of
148 * w-bit windows, not counting the first one.
153 * w = 5 if 671 > b > 239
154 * w = 4 if 239 > b > 79
155 * w = 3 if 79 > b > 23
158 * (with draws in between). Very small exponents are often selected
159 * with low Hamming weight, so we use w = 1 for b <= 23.
162 #define BN_window_bits_for_exponent_size(b) \
168 /* Old SSLeay/OpenSSL table.
169 * Maximum window size was 5, so this table differs for b==1024;
170 * but it coincides for other interesting values (b==160, b==512).
172 #define BN_window_bits_for_exponent_size(b) \
180 /* Pentium pro 16,16,16,32,64 */
181 /* Alpha 16,16,16,16.64 */
182 #define BN_MULL_SIZE_NORMAL (16) /* 32 */
183 #define BN_MUL_RECURSIVE_SIZE_NORMAL (16) /* 32 less than */
184 #define BN_SQR_RECURSIVE_SIZE_NORMAL (16) /* 32 */
185 #define BN_MUL_LOW_RECURSIVE_SIZE_NORMAL (32) /* 32 */
186 #define BN_MONT_CTX_SET_SIZE_WORD (64) /* 32 */
188 #if !defined(OPENSSL_NO_ASM) && !defined(OPENSSL_NO_INLINE_ASM) && !defined(PEDANTIC)
190 * BN_UMULT_HIGH section.
192 * No, I'm not trying to overwhelm you when stating that the
193 * product of N-bit numbers is 2*N bits wide:-) No, I don't expect
194 * you to be impressed when I say that if the compiler doesn't
195 * support 2*N integer type, then you have to replace every N*N
196 * multiplication with 4 (N/2)*(N/2) accompanied by some shifts
197 * and additions which unavoidably results in severe performance
198 * penalties. Of course provided that the hardware is capable of
199 * producing 2*N result... That's when you normally start
200 * considering assembler implementation. However! It should be
201 * pointed out that some CPUs (most notably Alpha, PowerPC and
202 * upcoming IA-64 family:-) provide *separate* instruction
203 * calculating the upper half of the product placing the result
204 * into a general purpose register. Now *if* the compiler supports
205 * inline assembler, then it's not impossible to implement the
206 * "bignum" routines (and have the compiler optimize 'em)
207 * exhibiting "native" performance in C. That's what BN_UMULT_HIGH
210 * <appro@fy.chalmers.se>
212 # if defined(__alpha) && (defined(SIXTY_FOUR_BIT_LONG) || defined(SIXTY_FOUR_BIT))
215 # define BN_UMULT_HIGH(a,b) (BN_ULONG)asm("umulh %a0,%a1,%v0",(a),(b))
216 # elif defined(__GNUC__)
217 # define BN_UMULT_HIGH(a,b) ({ \
218 register BN_ULONG ret; \
219 asm ("umulh %1,%2,%0" \
223 # endif /* compiler */
224 # elif defined(_ARCH_PPC) && defined(__64BIT__) && defined(SIXTY_FOUR_BIT_LONG)
225 # if defined(__GNUC__)
226 # define BN_UMULT_HIGH(a,b) ({ \
227 register BN_ULONG ret; \
228 asm ("mulhdu %0,%1,%2" \
232 # endif /* compiler */
233 # elif defined(__x86_64) && defined(SIXTY_FOUR_BIT_LONG)
234 # if defined(__GNUC__)
235 # define BN_UMULT_HIGH(a,b) ({ \
236 register BN_ULONG ret,discard; \
238 : "=a"(discard),"=d"(ret) \
242 # define BN_UMULT_LOHI(low,high,a,b) \
244 : "=a"(low),"=d"(high) \
249 #endif /* OPENSSL_NO_ASM */
251 /*************************************************************
252 * Using the long long type
254 #define Lw(t) (((BN_ULONG)(t))&BN_MASK2)
255 #define Hw(t) (((BN_ULONG)((t)>>BN_BITS2))&BN_MASK2)
257 /* This is used for internal error checking and is not normally used */
260 # define bn_check_top(a) assert ((a)->top >= 0 && (a)->top <= (a)->dmax);
262 # define bn_check_top(a)
265 /* This macro is to add extra stuff for development checking */
267 #define bn_set_max(r) ((r)->max=(r)->top,BN_set_flags((r),BN_FLG_STATIC_DATA))
269 #define bn_set_max(r)
272 /* These macros are used to 'take' a section of a bignum for read only use */
273 #define bn_set_low(r,a,n) \
275 (r)->top=((a)->top > (n))?(n):(a)->top; \
278 (r)->flags|=BN_FLG_STATIC_DATA; \
282 #define bn_set_high(r,a,n) \
284 if ((a)->top > (n)) \
286 (r)->top=(a)->top-n; \
287 (r)->d= &((a)->d[n]); \
292 (r)->flags|=BN_FLG_STATIC_DATA; \
297 #define mul_add(r,a,w,c) { \
299 t=(BN_ULLONG)w * (a) + (r) + (c); \
304 #define mul(r,a,w,c) { \
306 t=(BN_ULLONG)w * (a) + (c); \
311 #define sqr(r0,r1,a) { \
313 t=(BN_ULLONG)(a)*(a); \
318 #elif defined(BN_UMULT_HIGH)
319 #define mul_add(r,a,w,c) { \
320 BN_ULONG high,low,ret,tmp=(a); \
322 high= BN_UMULT_HIGH(w,tmp); \
325 (c) = (ret<(c))?1:0; \
328 (c) += (ret<low)?1:0; \
332 #define mul(r,a,w,c) { \
333 BN_ULONG high,low,ret,ta=(a); \
335 high= BN_UMULT_HIGH(w,ta); \
338 (c) += (ret<low)?1:0; \
342 #define sqr(r0,r1,a) { \
345 (r1) = BN_UMULT_HIGH(tmp,tmp); \
349 /*************************************************************
353 #define LBITS(a) ((a)&BN_MASK2l)
354 #define HBITS(a) (((a)>>BN_BITS4)&BN_MASK2l)
355 #define L2HBITS(a) (((a)<<BN_BITS4)&BN_MASK2)
357 #define LLBITS(a) ((a)&BN_MASKl)
358 #define LHBITS(a) (((a)>>BN_BITS2)&BN_MASKl)
359 #define LL2HBITS(a) ((BN_ULLONG)((a)&BN_MASKl)<<BN_BITS2)
361 #define mul64(l,h,bl,bh) \
363 BN_ULONG m,m1,lt,ht; \
371 m=(m+m1)&BN_MASK2; if (m < m1) ht+=L2HBITS((BN_ULONG)1); \
374 lt=(lt+m1)&BN_MASK2; if (lt < m1) ht++; \
379 #define sqr64(lo,ho,in) \
389 h+=(m&BN_MASK2h1)>>(BN_BITS4-1); \
390 m =(m&BN_MASK2l)<<(BN_BITS4+1); \
391 l=(l+m)&BN_MASK2; if (l < m) h++; \
396 #define mul_add(r,a,bl,bh,c) { \
402 mul64(l,h,(bl),(bh)); \
404 /* non-multiply part */ \
405 l=(l+(c))&BN_MASK2; if (l < (c)) h++; \
407 l=(l+(c))&BN_MASK2; if (l < (c)) h++; \
412 #define mul(r,a,bl,bh,c) { \
418 mul64(l,h,(bl),(bh)); \
420 /* non-multiply part */ \
421 l+=(c); if ((l&BN_MASK2) < (c)) h++; \
425 #endif /* !BN_LLONG */
427 void bn_mul_normal(BN_ULONG *r,BN_ULONG *a,int na,BN_ULONG *b,int nb);
428 void bn_mul_comba8(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b);
429 void bn_mul_comba4(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b);
430 void bn_sqr_normal(BN_ULONG *r, const BN_ULONG *a, int n, BN_ULONG *tmp);
431 void bn_sqr_comba8(BN_ULONG *r,const BN_ULONG *a);
432 void bn_sqr_comba4(BN_ULONG *r,const BN_ULONG *a);
433 int bn_cmp_words(const BN_ULONG *a,const BN_ULONG *b,int n);
434 int bn_cmp_part_words(const BN_ULONG *a, const BN_ULONG *b,
437 /* bn_mul.c rollback <appro> */
438 void bn_mul_recursive(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,int n2,
439 int dna,int dnb,BN_ULONG *t);
440 void bn_mul_part_recursive(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,
441 int n,int tna,int tnb,BN_ULONG *t);
443 void bn_sqr_recursive(BN_ULONG *r,const BN_ULONG *a, int n2, BN_ULONG *t);
444 void bn_mul_low_normal(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b, int n);
445 void bn_mul_low_recursive(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,int n2,
447 void bn_mul_high(BN_ULONG *r,BN_ULONG *a,BN_ULONG *b,BN_ULONG *l,int n2,