Bug Summary

File:src/lib/libcrypto/des/pcbc_enc.c
Warning:line 122, column 2
Value stored to 'sin0' 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 pcbc_enc.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/pcbc_enc.c
1/* $OpenBSD: pcbc_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
61void DES_pcbc_encrypt(const unsigned char *input, unsigned char *output,
62 long length, DES_key_schedule *schedule,
63 DES_cblock *ivec, int enc)
64 {
65 DES_LONGunsigned int sin0,sin1,xor0,xor1,tout0,tout1;
66 DES_LONGunsigned int tin[2];
67 const unsigned char *in;
68 unsigned char *out,*iv;
69
70 in=input;
71 out=output;
72 iv = &(*ivec)[0];
73
74 if (enc)
75 {
76 c2l(iv,xor0)(xor0 =((unsigned int)(*((iv)++))) , xor0|=((unsigned int)(*(
(iv)++)))<< 8L, xor0|=((unsigned int)(*((iv)++)))<<
16L, xor0|=((unsigned int)(*((iv)++)))<<24L)
;
77 c2l(iv,xor1)(xor1 =((unsigned int)(*((iv)++))) , xor1|=((unsigned int)(*(
(iv)++)))<< 8L, xor1|=((unsigned int)(*((iv)++)))<<
16L, xor1|=((unsigned int)(*((iv)++)))<<24L)
;
78 for (; length>0; length-=8)
79 {
80 if (length >= 8)
81 {
82 c2l(in,sin0)(sin0 =((unsigned int)(*((in)++))) , sin0|=((unsigned int)(*(
(in)++)))<< 8L, sin0|=((unsigned int)(*((in)++)))<<
16L, sin0|=((unsigned int)(*((in)++)))<<24L)
;
83 c2l(in,sin1)(sin1 =((unsigned int)(*((in)++))) , sin1|=((unsigned int)(*(
(in)++)))<< 8L, sin1|=((unsigned int)(*((in)++)))<<
16L, sin1|=((unsigned int)(*((in)++)))<<24L)
;
84 }
85 else
86 c2ln(in,sin0,sin1,length){ in+=length; sin0=sin1=0; switch (length) { case 8: sin1 =((
unsigned int)(*(--(in))))<<24L; case 7: sin1|=((unsigned
int)(*(--(in))))<<16L; case 6: sin1|=((unsigned int)(*
(--(in))))<< 8L; case 5: sin1|=((unsigned int)(*(--(in)
))); case 4: sin0 =((unsigned int)(*(--(in))))<<24L; case
3: sin0|=((unsigned int)(*(--(in))))<<16L; case 2: sin0
|=((unsigned int)(*(--(in))))<< 8L; case 1: sin0|=((unsigned
int)(*(--(in)))); } }
;
87 tin[0]=sin0^xor0;
88 tin[1]=sin1^xor1;
89 DES_encrypt1((DES_LONGunsigned int *)tin,schedule,DES_ENCRYPT1);
90 tout0=tin[0];
91 tout1=tin[1];
92 xor0=sin0^tout0;
93 xor1=sin1^tout1;
94 l2c(tout0,out)(*((out)++)=(unsigned char)(((tout0) )&0xff), *((out)++)=
(unsigned char)(((tout0)>> 8L)&0xff), *((out)++)=(unsigned
char)(((tout0)>>16L)&0xff), *((out)++)=(unsigned char
)(((tout0)>>24L)&0xff))
;
95 l2c(tout1,out)(*((out)++)=(unsigned char)(((tout1) )&0xff), *((out)++)=
(unsigned char)(((tout1)>> 8L)&0xff), *((out)++)=(unsigned
char)(((tout1)>>16L)&0xff), *((out)++)=(unsigned char
)(((tout1)>>24L)&0xff))
;
96 }
97 }
98 else
99 {
100 c2l(iv,xor0)(xor0 =((unsigned int)(*((iv)++))) , xor0|=((unsigned int)(*(
(iv)++)))<< 8L, xor0|=((unsigned int)(*((iv)++)))<<
16L, xor0|=((unsigned int)(*((iv)++)))<<24L)
; c2l(iv,xor1)(xor1 =((unsigned int)(*((iv)++))) , xor1|=((unsigned int)(*(
(iv)++)))<< 8L, xor1|=((unsigned int)(*((iv)++)))<<
16L, xor1|=((unsigned int)(*((iv)++)))<<24L)
;
101 for (; length>0; length-=8)
102 {
103 c2l(in,sin0)(sin0 =((unsigned int)(*((in)++))) , sin0|=((unsigned int)(*(
(in)++)))<< 8L, sin0|=((unsigned int)(*((in)++)))<<
16L, sin0|=((unsigned int)(*((in)++)))<<24L)
;
104 c2l(in,sin1)(sin1 =((unsigned int)(*((in)++))) , sin1|=((unsigned int)(*(
(in)++)))<< 8L, sin1|=((unsigned int)(*((in)++)))<<
16L, sin1|=((unsigned int)(*((in)++)))<<24L)
;
105 tin[0]=sin0;
106 tin[1]=sin1;
107 DES_encrypt1((DES_LONGunsigned int *)tin,schedule,DES_DECRYPT0);
108 tout0=tin[0]^xor0;
109 tout1=tin[1]^xor1;
110 if (length >= 8)
111 {
112 l2c(tout0,out)(*((out)++)=(unsigned char)(((tout0) )&0xff), *((out)++)=
(unsigned char)(((tout0)>> 8L)&0xff), *((out)++)=(unsigned
char)(((tout0)>>16L)&0xff), *((out)++)=(unsigned char
)(((tout0)>>24L)&0xff))
;
113 l2c(tout1,out)(*((out)++)=(unsigned char)(((tout1) )&0xff), *((out)++)=
(unsigned char)(((tout1)>> 8L)&0xff), *((out)++)=(unsigned
char)(((tout1)>>16L)&0xff), *((out)++)=(unsigned char
)(((tout1)>>24L)&0xff))
;
114 }
115 else
116 l2cn(tout0,tout1,out,length){ out+=length; switch (length) { case 8: *(--(out))=(unsigned
char)(((tout1)>>24L)&0xff); case 7: *(--(out))=(unsigned
char)(((tout1)>>16L)&0xff); case 6: *(--(out))=(unsigned
char)(((tout1)>> 8L)&0xff); case 5: *(--(out))=(unsigned
char)(((tout1) )&0xff); case 4: *(--(out))=(unsigned char
)(((tout0)>>24L)&0xff); case 3: *(--(out))=(unsigned
char)(((tout0)>>16L)&0xff); case 2: *(--(out))=(unsigned
char)(((tout0)>> 8L)&0xff); case 1: *(--(out))=(unsigned
char)(((tout0) )&0xff); } }
;
117 xor0=tout0^sin0;
118 xor1=tout1^sin1;
119 }
120 }
121 tin[0]=tin[1]=0;
122 sin0=sin1=xor0=xor1=tout0=tout1=0;
Value stored to 'sin0' is never read
123 }