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Diffstat (limited to 'src/lib/libcrypto/bn/bn_mul.c')
-rw-r--r-- | src/lib/libcrypto/bn/bn_mul.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/src/lib/libcrypto/bn/bn_mul.c b/src/lib/libcrypto/bn/bn_mul.c new file mode 100644 index 0000000000..d0c04e1d4b --- /dev/null +++ b/src/lib/libcrypto/bn/bn_mul.c | |||
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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) */ | ||
65 | int BN_mul(r, a, b) | ||
66 | BIGNUM *r; | ||
67 | BIGNUM *a; | ||
68 | BIGNUM *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 | |||
104 | int limit=16; | ||
105 | |||
106 | typedef struct bn_pool_st | ||
107 | { | ||
108 | int used; | ||
109 | int tos; | ||
110 | STACK *sk; | ||
111 | } BN_POOL; | ||
112 | |||
113 | BIGNUM *BN_POOL_push(bp) | ||
114 | BN_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 | |||
133 | void BN_POOL_pop(bp,num) | ||
134 | BN_POOL *bp; | ||
135 | int num; | ||
136 | { | ||
137 | bp->used-=num; | ||
138 | } | ||
139 | |||
140 | int BN_mul(r,a,b) | ||
141 | BIGNUM *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 */ | ||
157 | int BN_mm(m, A, B, bp) | ||
158 | BIGNUM *m,*A,*B; | ||
159 | BN_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 | ||