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1 office 1 /* crypto/bn/bn_word.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 "bn_lcl.h"
61  
62 int BN_add_word(BIGNUM *a, BN_ULONG w)
63 {
64 BN_ULONG l;
65 int i;
66  
67 if (a->neg)
68 {
69 a->neg=0;
70 i=BN_sub_word(a,w);
71 if (!BN_is_zero(a))
72 a->neg=!(a->neg);
73 return(i);
74 }
75 w&=BN_MASK2;
76 if (bn_wexpand(a,a->top+1) == NULL) return(0);
77 i=0;
78 for (;;)
79 {
80 l=(a->d[i]+(BN_ULONG)w)&BN_MASK2;
81 a->d[i]=l;
82 if (w > l)
83 w=1;
84 else
85 break;
86 i++;
87 }
88 if (i >= a->top)
89 a->top++;
90 return(1);
91 }
92  
93 int BN_sub_word(BIGNUM *a, BN_ULONG w)
94 {
95 int i;
96  
97 if (BN_is_zero(a) || a->neg)
98 {
99 a->neg=0;
100 i=BN_add_word(a,w);
101 a->neg=1;
102 return(i);
103 }
104  
105 w&=BN_MASK2;
106 if ((a->top == 1) && (a->d[0] < w))
107 {
108 a->d[0]=w-a->d[0];
109 a->neg=1;
110 return(1);
111 }
112 i=0;
113 for (;;)
114 {
115 if (a->d[i] >= w)
116 {
117 a->d[i]-=w;
118 break;
119 }
120 else
121 {
122 a->d[i]=(a->d[i]-w)&BN_MASK2;
123 i++;
124 w=1;
125 }
126 }
127 if ((a->d[i] == 0) && (i == (a->top-1)))
128 a->top--;
129 return(1);
130 }