| File: | src/lib/libcrypto/des/ofb_enc.c |
| Warning: | line 133, column 26 Although the value stored to 'vv0' is used in the enclosing expression, the value is never actually read from 'vv0' |
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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 'vv0' is used in the enclosing expression, the value is never actually read from 'vv0' | |
| 134 | } |
| 135 |