Bug Summary

File:crypto/ecb_enc.c
Warning:line 101, column 2
Value stored to 'l' 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 ecb_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 static -mframe-pointer=all -relaxed-aliasing -fno-rounding-math -mconstructor-aliases -ffreestanding -mcmodel=kernel -target-cpu x86-64 -target-feature +retpoline-indirect-calls -target-feature +retpoline-indirect-branches -target-feature -sse2 -target-feature -sse -target-feature -3dnow -target-feature -mmx -target-feature +save-args -disable-red-zone -no-implicit-float -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -nostdsysteminc -nobuiltininc -resource-dir /usr/local/lib/clang/13.0.0 -I /usr/src/sys -I /usr/src/sys/arch/amd64/compile/GENERIC.MP/obj -I /usr/src/sys/arch -I /usr/src/sys/dev/pci/drm/include -I /usr/src/sys/dev/pci/drm/include/uapi -I /usr/src/sys/dev/pci/drm/amd/include/asic_reg -I /usr/src/sys/dev/pci/drm/amd/include -I /usr/src/sys/dev/pci/drm/amd/amdgpu -I /usr/src/sys/dev/pci/drm/amd/display -I /usr/src/sys/dev/pci/drm/amd/display/include -I /usr/src/sys/dev/pci/drm/amd/display/dc -I /usr/src/sys/dev/pci/drm/amd/display/amdgpu_dm -I /usr/src/sys/dev/pci/drm/amd/pm/inc -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu11 -I /usr/src/sys/dev/pci/drm/amd/pm/swsmu/smu12 -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/hwmgr -I /usr/src/sys/dev/pci/drm/amd/pm/powerplay/smumgr -I /usr/src/sys/dev/pci/drm/amd/display/dc/inc -I /usr/src/sys/dev/pci/drm/amd/display/dc/inc/hw -I /usr/src/sys/dev/pci/drm/amd/display/dc/clk_mgr -I /usr/src/sys/dev/pci/drm/amd/display/modules/inc -I /usr/src/sys/dev/pci/drm/amd/display/modules/hdcp -I /usr/src/sys/dev/pci/drm/amd/display/dmub/inc -I /usr/src/sys/dev/pci/drm/i915 -D DDB -D DIAGNOSTIC -D KTRACE -D ACCOUNTING -D KMEMSTATS -D PTRACE -D POOL_DEBUG -D CRYPTO -D SYSVMSG -D SYSVSEM -D SYSVSHM -D UVM_SWAP_ENCRYPT -D FFS -D FFS2 -D FFS_SOFTUPDATES -D UFS_DIRHASH -D QUOTA -D EXT2FS -D MFS -D NFSCLIENT -D NFSSERVER -D CD9660 -D UDF -D MSDOSFS -D FIFO -D FUSE -D SOCKET_SPLICE -D TCP_ECN -D TCP_SIGNATURE -D INET6 -D IPSEC -D PPP_BSDCOMP -D PPP_DEFLATE -D PIPEX -D MROUTING -D MPLS -D BOOT_CONFIG -D USER_PCICONF -D APERTURE -D MTRR -D NTFS -D HIBERNATE -D PCIVERBOSE -D USBVERBOSE -D WSDISPLAY_COMPAT_USL -D WSDISPLAY_COMPAT_RAWKBD -D WSDISPLAY_DEFAULTSCREENS=6 -D X86EMU -D ONEWIREVERBOSE -D MULTIPROCESSOR -D MAXUSERS=80 -D _KERNEL -D CONFIG_DRM_AMD_DC_DCN3_0 -O2 -Wno-pointer-sign -Wno-address-of-packed-member -Wno-constant-conversion -Wno-unused-but-set-variable -Wno-gnu-folding-constant -fdebug-compilation-dir=/usr/src/sys/arch/amd64/compile/GENERIC.MP/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 -o /usr/obj/sys/arch/amd64/compile/GENERIC.MP/scan-build/2022-01-12-131800-47421-1 -x c /usr/src/sys/crypto/ecb_enc.c
1/* $OpenBSD: ecb_enc.c,v 1.6 2015/12/10 21:00:51 naddy Exp $ */
2
3/* lib/des/ecb_enc.c */
4/* Copyright (C) 1995 Eric Young (eay@mincom.oz.au)
5 * All rights reserved.
6 *
7 * This file is part of an SSL implementation written
8 * by Eric Young (eay@mincom.oz.au).
9 * The implementation was written so as to conform with Netscapes SSL
10 * specification. This library and applications are
11 * FREE FOR COMMERCIAL AND NON-COMMERCIAL USE
12 * as long as the following conditions are aheared to.
13 *
14 * Copyright remains Eric Young's, and as such any Copyright notices in
15 * the code are not to be removed. If this code is used in a product,
16 * Eric Young should be given attribution as the author of the parts used.
17 * This can be in the form of a textual message at program startup or
18 * in documentation (online or textual) provided with the package.
19 *
20 * Redistribution and use in source and binary forms, with or without
21 * modification, are permitted provided that the following conditions
22 * are met:
23 * 1. Redistributions of source code must retain the copyright
24 * notice, this list of conditions and the following disclaimer.
25 * 2. Redistributions in binary form must reproduce the above copyright
26 * notice, this list of conditions and the following disclaimer in the
27 * documentation and/or other materials provided with the distribution.
28 * 3. All advertising materials mentioning features or use of this software
29 * must display the following acknowledgement:
30 * This product includes software developed by Eric Young (eay@mincom.oz.au)
31 *
32 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
33 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
34 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
35 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
36 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
37 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
38 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
39 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
40 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
41 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
42 * SUCH DAMAGE.
43 *
44 * The licence and distribution terms for any publically available version or
45 * derivative of this code cannot be changed. i.e. this code cannot simply be
46 * copied and put under another distribution licence
47 * [including the GNU Public Licence.]
48 */
49
50#include "des_locl.h"
51#include "spr.h"
52
53void
54des_encrypt2(u_int32_t *data, des_key_schedule ks, int encrypt)
55{
56 register u_int32_t l, r, t, u;
57#ifdef DES_USE_PTR
58 register unsigned char *des_SP=(unsigned char *)des_SPtrans;
59#endif
60 register int i;
61 register u_int32_t *s;
62
63 u = data[0];
64 r = data[1];
65
66 /* Things have been modified so that the initial rotate is
67 * done outside the loop. This required the
68 * des_SPtrans values in sp.h to be rotated 1 bit to the right.
69 * One perl script later and things have a 5% speed up on a sparc2.
70 * Thanks to Richard Outerbridge <71755.204@CompuServe.COM>
71 * for pointing this out. */
72 l = (r << 1) | (r >> 31);
73 r = (u << 1) | (u >> 31);
74
75 /* clear the top bits on machines with 8byte longs */
76 l &= 0xffffffffL;
77 r &= 0xffffffffL;
78
79 s = (u_int32_t *) ks;
80 /* I don't know if it is worth the effort of loop unrolling the
81 * inner loop */
82 if (encrypt) {
83 for (i = 0; i < 32; i += 4) {
84 D_ENCRYPT(l, r, i + 0){ u=(r^s[i + 0 ]); t=r^s[i + 0 +1]; t=((t>>4L)+(t<<
28L)); l^= des_SPtrans[1][(t )&0x3f]| des_SPtrans[3][(t>>
8L)&0x3f]| des_SPtrans[5][(t>>16L)&0x3f]| des_SPtrans
[7][(t>>24L)&0x3f]| des_SPtrans[0][(u )&0x3f]| des_SPtrans
[2][(u>> 8L)&0x3f]| des_SPtrans[4][(u>>16L)&
0x3f]| des_SPtrans[6][(u>>24L)&0x3f]; }
; /* 1 */
85 D_ENCRYPT(r, l, i + 2){ u=(l^s[i + 2 ]); t=l^s[i + 2 +1]; t=((t>>4L)+(t<<
28L)); r^= des_SPtrans[1][(t )&0x3f]| des_SPtrans[3][(t>>
8L)&0x3f]| des_SPtrans[5][(t>>16L)&0x3f]| des_SPtrans
[7][(t>>24L)&0x3f]| des_SPtrans[0][(u )&0x3f]| des_SPtrans
[2][(u>> 8L)&0x3f]| des_SPtrans[4][(u>>16L)&
0x3f]| des_SPtrans[6][(u>>24L)&0x3f]; }
; /* 2 */
86 }
87 } else {
88 for (i = 30; i > 0; i -= 4) {
89 D_ENCRYPT(l, r, i - 0){ u=(r^s[i - 0 ]); t=r^s[i - 0 +1]; t=((t>>4L)+(t<<
28L)); l^= des_SPtrans[1][(t )&0x3f]| des_SPtrans[3][(t>>
8L)&0x3f]| des_SPtrans[5][(t>>16L)&0x3f]| des_SPtrans
[7][(t>>24L)&0x3f]| des_SPtrans[0][(u )&0x3f]| des_SPtrans
[2][(u>> 8L)&0x3f]| des_SPtrans[4][(u>>16L)&
0x3f]| des_SPtrans[6][(u>>24L)&0x3f]; }
; /* 16 */
90 D_ENCRYPT(r, l, i - 2){ u=(l^s[i - 2 ]); t=l^s[i - 2 +1]; t=((t>>4L)+(t<<
28L)); r^= des_SPtrans[1][(t )&0x3f]| des_SPtrans[3][(t>>
8L)&0x3f]| des_SPtrans[5][(t>>16L)&0x3f]| des_SPtrans
[7][(t>>24L)&0x3f]| des_SPtrans[0][(u )&0x3f]| des_SPtrans
[2][(u>> 8L)&0x3f]| des_SPtrans[4][(u>>16L)&
0x3f]| des_SPtrans[6][(u>>24L)&0x3f]; }
; /* 15 */
91 }
92 }
93 l = (l >> 1) | (l << 31);
94 r = (r >> 1) | (r << 31);
95 /* clear the top bits on machines with 8byte longs */
96 l &= 0xffffffffL;
97 r &= 0xffffffffL;
98
99 data[0] = l;
100 data[1] = r;
101 l = r = t = u = 0;
Value stored to 'l' is never read
102}