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1/* crypto/bn/bn_mul.c */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
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.
8 *
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).
15 *
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.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
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)"
40 *
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
51 * SUCH DAMAGE.
52 *
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.]
57 */
58
59#include <stdio.h>
60#include "cryptlib.h"
61#include "bn_lcl.h"
62
63/* r must be different to a and b */
64/* int BN_mmul(r, a, b) */
65int BN_mul(r, a, b)
66BIGNUM *r;
67BIGNUM *a;
68BIGNUM *b;
69 {
70 int i;
71 int max,al,bl;
72 BN_ULONG *ap,*bp,*rp;
73
74 al=a->top;
75 bl=b->top;
76 if ((al == 0) || (bl == 0))
77 {
78 r->top=0;
79 return(1);
80 }
81
82 max=(al+bl);
83 if (bn_wexpand(r,max) == NULL) return(0);
84 r->top=max;
85 r->neg=a->neg^b->neg;
86 ap=a->d;
87 bp=b->d;
88 rp=r->d;
89
90 rp[al]=bn_mul_words(rp,ap,al,*(bp++));
91 rp++;
92 for (i=1; i<bl; i++)
93 {
94 rp[al]=bn_mul_add_words(rp,ap,al,*(bp++));
95 rp++;
96 }
97 if (r->d[max-1] == 0) r->top--;
98 return(1);
99 }
100
101#if 0
102#include "stack.h"
103
104int limit=16;
105
106typedef struct bn_pool_st
107 {
108 int used;
109 int tos;
110 STACK *sk;
111 } BN_POOL;
112
113BIGNUM *BN_POOL_push(bp)
114BN_POOL *bp;
115 {
116 BIGNUM *ret;
117
118 if (bp->used >= bp->tos)
119 {
120 ret=BN_new();
121 sk_push(bp->sk,(char *)ret);
122 bp->tos++;
123 bp->used++;
124 }
125 else
126 {
127 ret=(BIGNUM *)sk_value(bp->sk,bp->used);
128 bp->used++;
129 }
130 return(ret);
131 }
132
133void BN_POOL_pop(bp,num)
134BN_POOL *bp;
135int num;
136 {
137 bp->used-=num;
138 }
139
140int BN_mul(r,a,b)
141BIGNUM *r,*a,*b;
142 {
143 static BN_POOL bp;
144 static init=1;
145
146 if (init)
147 {
148 bp.used=0;
149 bp.tos=0;
150 bp.sk=sk_new_null();
151 init=0;
152 }
153 return(BN_mm(r,a,b,&bp));
154 }
155
156/* r must be different to a and b */
157int BN_mm(m, A, B, bp)
158BIGNUM *m,*A,*B;
159BN_POOL *bp;
160 {
161 int i,num;
162 int an,bn;
163 BIGNUM *a,*b,*c,*d,*ac,*bd;
164
165 an=A->top;
166 bn=B->top;
167 if ((an <= limit) || (bn <= limit))
168 {
169 return(BN_mmul(m,A,B));
170 }
171
172 a=BN_POOL_push(bp);
173 b=BN_POOL_push(bp);
174 c=BN_POOL_push(bp);
175 d=BN_POOL_push(bp);
176 ac=BN_POOL_push(bp);
177 bd=BN_POOL_push(bp);
178
179 num=(an <= bn)?an:bn;
180 num=1<<(BN_num_bits_word(num-1)-1);
181
182 /* Are going to now chop things into 'num' word chunks. */
183 num*=BN_BITS2;
184
185 BN_copy(a,A);
186 BN_mask_bits(a,num);
187 BN_rshift(b,A,num);
188
189 BN_copy(c,B);
190 BN_mask_bits(c,num);
191 BN_rshift(d,B,num);
192
193 BN_sub(ac ,b,a);
194 BN_sub(bd,c,d);
195 BN_mm(m,ac,bd,bp);
196 BN_mm(ac,a,c,bp);
197 BN_mm(bd,b,d,bp);
198
199 BN_add(m,m,ac);
200 BN_add(m,m,bd);
201 BN_lshift(m,m,num);
202 BN_lshift(bd,bd,num*2);
203
204 BN_add(m,m,ac);
205 BN_add(m,m,bd);
206 BN_POOL_pop(bp,6);
207 return(1);
208 }
209#endif