File: | src/lib/libcrypto/des/ofb_enc.c |
Warning: | line 132, column 12 Although the value stored to 'd0' is used in the enclosing expression, the value is never actually read from 'd0' |
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1 | /* $OpenBSD: ofb_enc.c,v 1.8 2023/07/08 07:11:07 beck Exp $ */ |
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 "des_local.h" |
60 | |
61 | /* The input and output are loaded in multiples of 8 bits. |
62 | * What this means is that if you hame numbits=12 and length=2 |
63 | * the first 12 bits will be retrieved from the first byte and half |
64 | * the second. The second 12 bits will come from the 3rd and half the 4th |
65 | * byte. |
66 | */ |
67 | void |
68 | DES_ofb_encrypt(const unsigned char *in, unsigned char *out, int numbits, |
69 | long length, DES_key_schedule *schedule, |
70 | DES_cblock *ivec) |
71 | { |
72 | DES_LONGunsigned int d0, d1, vv0, vv1, v0, v1, n = (numbits + 7)/8; |
73 | DES_LONGunsigned int mask0, mask1; |
74 | long l = length; |
75 | int num = numbits; |
76 | DES_LONGunsigned int ti[2]; |
77 | unsigned char *iv; |
78 | |
79 | if (num > 64) |
80 | return; |
81 | if (num > 32) { |
82 | mask0 = 0xffffffffL; |
83 | if (num >= 64) |
84 | mask1 = mask0; |
85 | else |
86 | mask1 = (1L << (num - 32)) - 1; |
87 | } else { |
88 | if (num == 32) |
89 | mask0 = 0xffffffffL; |
90 | else |
91 | mask0 = (1L << num) - 1; |
92 | mask1 = 0x00000000L; |
93 | } |
94 | |
95 | iv = &(*ivec)[0]; |
96 | c2l(iv, v0)(v0 =((unsigned int)(*((iv)++))) , v0|=((unsigned int)(*((iv) ++)))<< 8L, v0|=((unsigned int)(*((iv)++)))<<16L, v0|=((unsigned int)(*((iv)++)))<<24L); |
97 | c2l(iv, v1)(v1 =((unsigned int)(*((iv)++))) , v1|=((unsigned int)(*((iv) ++)))<< 8L, v1|=((unsigned int)(*((iv)++)))<<16L, v1|=((unsigned int)(*((iv)++)))<<24L); |
98 | ti[0] = v0; |
99 | ti[1] = v1; |
100 | while (l-- > 0) { |
101 | ti[0] = v0; |
102 | ti[1] = v1; |
103 | DES_encrypt1((DES_LONGunsigned int *)ti, schedule, DES_ENCRYPT1); |
104 | vv0 = ti[0]; |
105 | vv1 = ti[1]; |
106 | c2ln(in, d0, d1, n){ in+=n; d0=d1=0; switch (n) { case 8: d1 =((unsigned int)(*( --(in))))<<24L; case 7: d1|=((unsigned int)(*(--(in)))) <<16L; case 6: d1|=((unsigned int)(*(--(in))))<< 8L ; case 5: d1|=((unsigned int)(*(--(in)))); case 4: d0 =((unsigned int)(*(--(in))))<<24L; case 3: d0|=((unsigned int)(*(-- (in))))<<16L; case 2: d0|=((unsigned int)(*(--(in))))<< 8L; case 1: d0|=((unsigned int)(*(--(in)))); } }; |
107 | in += n; |
108 | d0 = (d0 ^ vv0) & mask0; |
109 | d1 = (d1 ^ vv1) & mask1; |
110 | l2cn(d0, d1, out, n){ out+=n; switch (n) { case 8: *(--(out))=(unsigned char)(((d1 )>>24L)&0xff); case 7: *(--(out))=(unsigned char)(( (d1)>>16L)&0xff); case 6: *(--(out))=(unsigned char )(((d1)>> 8L)&0xff); case 5: *(--(out))=(unsigned char )(((d1) )&0xff); case 4: *(--(out))=(unsigned char)(((d0) >>24L)&0xff); case 3: *(--(out))=(unsigned char)((( d0)>>16L)&0xff); case 2: *(--(out))=(unsigned char) (((d0)>> 8L)&0xff); case 1: *(--(out))=(unsigned char )(((d0) )&0xff); } }; |
111 | out += n; |
112 | |
113 | if (num == 32) { |
114 | v0 = v1; |
115 | v1 = vv0; |
116 | } else if (num == 64) { |
117 | v0 = vv0; |
118 | v1 = vv1; |
119 | } else if (num > 32) { /* && num != 64 */ |
120 | v0 = ((v1 >> (num - 32))|(vv0 << (64 - num))) & |
121 | 0xffffffffL; |
122 | v1 = ((vv0 >> (num - 32))|(vv1 << (64 - num))) & |
123 | 0xffffffffL; |
124 | } else /* num < 32 */ { |
125 | v0 = ((v0 >> num)|(v1 << (32 - num))) & 0xffffffffL; |
126 | v1 = ((v1 >> num)|(vv0 << (32 - num))) & 0xffffffffL; |
127 | } |
128 | } |
129 | iv = &(*ivec)[0]; |
130 | l2c(v0, iv)(*((iv)++)=(unsigned char)(((v0) )&0xff), *((iv)++)=(unsigned char)(((v0)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v0)>>16L)&0xff), *((iv)++)=(unsigned char)(((v0) >>24L)&0xff)); |
131 | l2c(v1, iv)(*((iv)++)=(unsigned char)(((v1) )&0xff), *((iv)++)=(unsigned char)(((v1)>> 8L)&0xff), *((iv)++)=(unsigned char) (((v1)>>16L)&0xff), *((iv)++)=(unsigned char)(((v1) >>24L)&0xff)); |
132 | v0 = v1 = d0 = d1 = ti[0] = ti[1] = vv0 = vv1 = 0; |
Although the value stored to 'd0' is used in the enclosing expression, the value is never actually read from 'd0' | |
133 | } |