Bug Summary

File:src/lib/libcrypto/des/ofb64enc.c
Warning:line 107, column 2
Value stored to 't' is never read

Annotated Source Code

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clang -cc1 -cc1 -triple amd64-unknown-openbsd7.0 -analyze -disable-free -disable-llvm-verifier -discard-value-names -main-file-name ofb64enc.c -analyzer-store=region -analyzer-opt-analyze-nested-blocks -analyzer-checker=core -analyzer-checker=apiModeling -analyzer-checker=unix -analyzer-checker=deadcode -analyzer-checker=security.insecureAPI.UncheckedReturn -analyzer-checker=security.insecureAPI.getpw -analyzer-checker=security.insecureAPI.gets -analyzer-checker=security.insecureAPI.mktemp -analyzer-checker=security.insecureAPI.mkstemp -analyzer-checker=security.insecureAPI.vfork -analyzer-checker=nullability.NullPassedToNonnull -analyzer-checker=nullability.NullReturnedFromNonnull -analyzer-output plist -w -setup-static-analyzer -mrelocation-model pic -pic-level 1 -pic-is-pie -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -munwind-tables -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/lib/libcrypto/obj -resource-dir /usr/local/lib/clang/13.0.0 -D LIBRESSL_INTERNAL -D LIBRESSL_CRYPTO_INTERNAL -D DSO_DLFCN -D HAVE_DLFCN_H -D HAVE_FUNOPEN -D OPENSSL_NO_HW_PADLOCK -I /usr/src/lib/libcrypto -I /usr/src/lib/libcrypto/asn1 -I /usr/src/lib/libcrypto/bio -I /usr/src/lib/libcrypto/bn -I /usr/src/lib/libcrypto/bytestring -I /usr/src/lib/libcrypto/dh -I /usr/src/lib/libcrypto/dsa -I /usr/src/lib/libcrypto/ec -I /usr/src/lib/libcrypto/ecdh -I /usr/src/lib/libcrypto/ecdsa -I /usr/src/lib/libcrypto/evp -I /usr/src/lib/libcrypto/hmac -I /usr/src/lib/libcrypto/modes -I /usr/src/lib/libcrypto/ocsp -I /usr/src/lib/libcrypto/rsa -I /usr/src/lib/libcrypto/x509 -I /usr/src/lib/libcrypto/obj -D AES_ASM -D BSAES_ASM -D VPAES_ASM -D OPENSSL_IA32_SSE2 -D RSA_ASM -D OPENSSL_BN_ASM_MONT -D OPENSSL_BN_ASM_MONT5 -D OPENSSL_BN_ASM_GF2m -D MD5_ASM -D GHASH_ASM -D RC4_MD5_ASM -D SHA1_ASM -D SHA256_ASM -D SHA512_ASM -D WHIRLPOOL_ASM -D OPENSSL_CPUID_OBJ -internal-isystem /usr/local/lib/clang/13.0.0/include -internal-externc-isystem /usr/include -O2 -fdebug-compilation-dir=/usr/src/lib/libcrypto/obj -ferror-limit 19 -fwrapv -D_RET_PROTECTOR -ret-protector -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -fno-builtin-malloc -fno-builtin-calloc -fno-builtin-realloc -fno-builtin-valloc -fno-builtin-free -fno-builtin-strdup -fno-builtin-strndup -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /home/ben/Projects/vmm/scan-build/2022-01-12-194120-40624-1 -x c /usr/src/lib/libcrypto/des/ofb64enc.c
1/* $OpenBSD: ofb64enc.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 encrypted as though 64bit ofb mode is being
62 * used. The extra state information to record how much of the
63 * 64bit block we have used is contained in *num;
64 */
65void DES_ofb64_encrypt(const unsigned char *in,
66 unsigned char *out, long length,
67 DES_key_schedule *schedule, DES_cblock *ivec, int *num)
68 {
69 DES_LONGunsigned int v0,v1,t;
70 int n= *num;
71 long l=length;
72 DES_cblock d;
73 unsigned char *dp;
74 DES_LONGunsigned int ti[2];
75 unsigned char *iv;
76 int save=0;
77
78 iv = &(*ivec)[0];
79 c2l(iv,v0)(v0 =((unsigned int)(*((iv)++))) , v0|=((unsigned int)(*((iv)
++)))<< 8L, v0|=((unsigned int)(*((iv)++)))<<16L,
v0|=((unsigned int)(*((iv)++)))<<24L)
;
80 c2l(iv,v1)(v1 =((unsigned int)(*((iv)++))) , v1|=((unsigned int)(*((iv)
++)))<< 8L, v1|=((unsigned int)(*((iv)++)))<<16L,
v1|=((unsigned int)(*((iv)++)))<<24L)
;
81 ti[0]=v0;
82 ti[1]=v1;
83 dp=d;
84 l2c(v0,dp)(*((dp)++)=(unsigned char)(((v0) )&0xff), *((dp)++)=(unsigned
char)(((v0)>> 8L)&0xff), *((dp)++)=(unsigned char)
(((v0)>>16L)&0xff), *((dp)++)=(unsigned char)(((v0)
>>24L)&0xff))
;
85 l2c(v1,dp)(*((dp)++)=(unsigned char)(((v1) )&0xff), *((dp)++)=(unsigned
char)(((v1)>> 8L)&0xff), *((dp)++)=(unsigned char)
(((v1)>>16L)&0xff), *((dp)++)=(unsigned char)(((v1)
>>24L)&0xff))
;
86 while (l--)
87 {
88 if (n == 0)
89 {
90 DES_encrypt1(ti,schedule,DES_ENCRYPT1);
91 dp=d;
92 t=ti[0]; l2c(t,dp)(*((dp)++)=(unsigned char)(((t) )&0xff), *((dp)++)=(unsigned
char)(((t)>> 8L)&0xff), *((dp)++)=(unsigned char)(
((t)>>16L)&0xff), *((dp)++)=(unsigned char)(((t)>>
24L)&0xff))
;
93 t=ti[1]; l2c(t,dp)(*((dp)++)=(unsigned char)(((t) )&0xff), *((dp)++)=(unsigned
char)(((t)>> 8L)&0xff), *((dp)++)=(unsigned char)(
((t)>>16L)&0xff), *((dp)++)=(unsigned char)(((t)>>
24L)&0xff))
;
94 save++;
95 }
96 *(out++)= *(in++)^d[n];
97 n=(n+1)&0x07;
98 }
99 if (save)
100 {
101 v0=ti[0];
102 v1=ti[1];
103 iv = &(*ivec)[0];
104 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))
;
105 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))
;
106 }
107 t=v0=v1=ti[0]=ti[1]=0;
Value stored to 't' is never read
108 *num=n;
109 }
110