File: | src/lib/libcrypto/des/ofb_enc.c |
Warning: | line 133, column 5 Although the value stored to 'v1' is used in the enclosing expression, the value is never actually read from 'v1' |
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1 | /* $OpenBSD: ofb_enc.c,v 1.6 2014/10/28 07:35:58 jsg 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_locl.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 DES_ofb_encrypt(const unsigned char *in, unsigned char *out, int numbits, |
68 | long length, DES_key_schedule *schedule, |
69 | DES_cblock *ivec) |
70 | { |
71 | DES_LONGunsigned int d0,d1,vv0,vv1,v0,v1,n=(numbits+7)/8; |
72 | DES_LONGunsigned int mask0,mask1; |
73 | long l=length; |
74 | int num=numbits; |
75 | DES_LONGunsigned int ti[2]; |
76 | unsigned char *iv; |
77 | |
78 | if (num > 64) return; |
79 | if (num > 32) |
80 | { |
81 | mask0=0xffffffffL; |
82 | if (num >= 64) |
83 | mask1=mask0; |
84 | else |
85 | mask1=(1L<<(num-32))-1; |
86 | } |
87 | else |
88 | { |
89 | if (num == 32) |
90 | mask0=0xffffffffL; |
91 | else |
92 | mask0=(1L<<num)-1; |
93 | mask1=0x00000000L; |
94 | } |
95 | |
96 | iv = &(*ivec)[0]; |
97 | c2l(iv,v0)(v0 =((unsigned int)(*((iv)++))) , v0|=((unsigned int)(*((iv) ++)))<< 8L, v0|=((unsigned int)(*((iv)++)))<<16L, v0|=((unsigned int)(*((iv)++)))<<24L); |
98 | c2l(iv,v1)(v1 =((unsigned int)(*((iv)++))) , v1|=((unsigned int)(*((iv) ++)))<< 8L, v1|=((unsigned int)(*((iv)++)))<<16L, v1|=((unsigned int)(*((iv)++)))<<24L); |
99 | ti[0]=v0; |
100 | ti[1]=v1; |
101 | while (l-- > 0) |
102 | { |
103 | ti[0]=v0; |
104 | ti[1]=v1; |
105 | DES_encrypt1((DES_LONGunsigned int *)ti,schedule,DES_ENCRYPT1); |
106 | vv0=ti[0]; |
107 | vv1=ti[1]; |
108 | 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)))); } }; |
109 | in+=n; |
110 | d0=(d0^vv0)&mask0; |
111 | d1=(d1^vv1)&mask1; |
112 | 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); } }; |
113 | out+=n; |
114 | |
115 | if (num == 32) |
116 | { v0=v1; v1=vv0; } |
117 | else if (num == 64) |
118 | { v0=vv0; v1=vv1; } |
119 | else if (num > 32) /* && num != 64 */ |
120 | { |
121 | v0=((v1>>(num-32))|(vv0<<(64-num)))&0xffffffffL; |
122 | v1=((vv0>>(num-32))|(vv1<<(64-num)))&0xffffffffL; |
123 | } |
124 | else /* num < 32 */ |
125 | { |
126 | v0=((v0>>num)|(v1<<(32-num)))&0xffffffffL; |
127 | v1=((v1>>num)|(vv0<<(32-num)))&0xffffffffL; |
128 | } |
129 | } |
130 | iv = &(*ivec)[0]; |
131 | 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)); |
132 | 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)); |
133 | v0=v1=d0=d1=ti[0]=ti[1]=vv0=vv1=0; |
Although the value stored to 'v1' is used in the enclosing expression, the value is never actually read from 'v1' | |
134 | } |
135 |