Bug Summary

File:out/../deps/openssl/openssl/crypto/des/cfb_enc.c
Warning:line 155, column 15
Although the value stored to 'd0' is used in the enclosing expression, the value is never actually read from 'd0'

Annotated Source Code

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clang -cc1 -cc1 -triple x86_64-unknown-linux-gnu -analyze -disable-free -clear-ast-before-backend -disable-llvm-verifier -discard-value-names -main-file-name cfb_enc.c -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 2 -pic-is-pie -mframe-pointer=all -fmath-errno -ffp-contract=on -fno-rounding-math -mconstructor-aliases -funwind-tables=2 -target-cpu x86-64 -tune-cpu generic -debugger-tuning=gdb -fcoverage-compilation-dir=/home/maurizio/node-v18.6.0/out -resource-dir /usr/local/lib/clang/16.0.0 -D V8_DEPRECATION_WARNINGS -D V8_IMMINENT_DEPRECATION_WARNINGS -D _GLIBCXX_USE_CXX11_ABI=1 -D NODE_OPENSSL_CONF_NAME=nodejs_conf -D NODE_OPENSSL_HAS_QUIC -D __STDC_FORMAT_MACROS -D OPENSSL_NO_PINSHARED -D OPENSSL_THREADS -D OPENSSL_NO_HW -D OPENSSL_API_COMPAT=0x10100001L -D STATIC_LEGACY -D NDEBUG -D OPENSSL_USE_NODELETE -D L_ENDIAN -D OPENSSL_BUILDING_OPENSSL -D AES_ASM -D BSAES_ASM -D CMLL_ASM -D ECP_NISTZ256_ASM -D GHASH_ASM -D KECCAK1600_ASM -D MD5_ASM -D OPENSSL_BN_ASM_GF2m -D OPENSSL_BN_ASM_MONT -D OPENSSL_BN_ASM_MONT5 -D OPENSSL_CPUID_OBJ -D OPENSSL_IA32_SSE2 -D PADLOCK_ASM -D POLY1305_ASM -D SHA1_ASM -D SHA256_ASM -D SHA512_ASM -D VPAES_ASM -D WHIRLPOOL_ASM -D X25519_ASM -D OPENSSL_PIC -D MODULESDIR="/home/maurizio/node-v18.6.0/out/Release/obj.target/deps/openssl/lib/openssl-modules" -D OPENSSLDIR="/home/maurizio/node-v18.6.0/out/Release/obj.target/deps/openssl" -D OPENSSLDIR="/etc/ssl" -D ENGINESDIR="/dev/null" -D TERMIOS -I ../deps/openssl/openssl -I ../deps/openssl/openssl/include -I ../deps/openssl/openssl/crypto -I ../deps/openssl/openssl/crypto/include -I ../deps/openssl/openssl/crypto/modes -I ../deps/openssl/openssl/crypto/ec/curve448 -I ../deps/openssl/openssl/crypto/ec/curve448/arch_32 -I ../deps/openssl/openssl/providers/common/include -I ../deps/openssl/openssl/providers/implementations/include -I ../deps/openssl/config -I ../deps/openssl/config/archs/linux-x86_64/asm -I ../deps/openssl/config/archs/linux-x86_64/asm/include -I ../deps/openssl/config/archs/linux-x86_64/asm/crypto -I ../deps/openssl/config/archs/linux-x86_64/asm/crypto/include/internal -I ../deps/openssl/config/archs/linux-x86_64/asm/providers/common/include -internal-isystem /usr/local/lib/clang/16.0.0/include -internal-isystem /usr/local/include -internal-isystem /usr/lib/gcc/x86_64-redhat-linux/8/../../../../x86_64-redhat-linux/include -internal-externc-isystem /include -internal-externc-isystem /usr/include -O3 -Wno-unused-parameter -Wno-missing-field-initializers -Wno-old-style-declaration -fdebug-compilation-dir=/home/maurizio/node-v18.6.0/out -ferror-limit 19 -fgnuc-version=4.2.1 -vectorize-loops -vectorize-slp -analyzer-output=html -faddrsig -D__GCC_HAVE_DWARF2_CFI_ASM=1 -o /tmp/scan-build-2022-08-22-142216-507842-1 -x c ../deps/openssl/openssl/crypto/des/cfb_enc.c
1/*
2 * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/*
11 * DES low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14#include "internal/deprecated.h"
15
16#include "e_os.h"
17#include "des_local.h"
18#include <assert.h>
19
20/*
21 * The input and output are loaded in multiples of 8 bits. What this means is
22 * that if you hame numbits=12 and length=2 the first 12 bits will be
23 * retrieved from the first byte and half the second. The second 12 bits
24 * will come from the 3rd and half the 4th byte.
25 */
26/*
27 * Until Aug 1 2003 this function did not correctly implement CFB-r, so it
28 * will not be compatible with any encryption prior to that date. Ben.
29 */
30void DES_cfb_encrypt(const unsigned char *in, unsigned char *out, int numbits,
31 long length, DES_key_schedule *schedule,
32 DES_cblock *ivec, int enc)
33{
34 register DES_LONG d0, d1, v0, v1;
35 register unsigned long l = length;
36 register int num = numbits / 8, n = (numbits + 7) / 8, i, rem =
37 numbits % 8;
38 DES_LONG ti[2];
39 unsigned char *iv;
40#ifndef L_ENDIAN1
41 unsigned char ovec[16];
42#else
43 unsigned int sh[4];
44 unsigned char *ovec = (unsigned char *)sh;
45
46 /* I kind of count that compiler optimizes away this assertion, */
47 assert(sizeof(sh[0]) == 4)((void) (0)); /* as this holds true for all, */
48 /* but 16-bit platforms... */
49
50#endif
51
52 if (numbits <= 0 || numbits > 64)
53 return;
54 iv = &(*ivec)[0];
55 c2l(iv, v0)(v0 =((DES_LONG)(*((iv)++))) , v0|=((DES_LONG)(*((iv)++)))<<
8L, v0|=((DES_LONG)(*((iv)++)))<<16L, v0|=((DES_LONG)(
*((iv)++)))<<24L);
56 c2l(iv, v1)(v1 =((DES_LONG)(*((iv)++))) , v1|=((DES_LONG)(*((iv)++)))<<
8L, v1|=((DES_LONG)(*((iv)++)))<<16L, v1|=((DES_LONG)(
*((iv)++)))<<24L);
57 if (enc) {
58 while (l >= (unsigned long)n) {
59 l -= n;
60 ti[0] = v0;
61 ti[1] = v1;
62 DES_encrypt1((DES_LONG *)ti, schedule, DES_ENCRYPT1);
63 c2ln(in, d0, d1, n){ in+=n; d0=d1=0; switch (n) { case 8: d1 =((DES_LONG)(*(--(in
))))<<24L; case 7: d1|=((DES_LONG)(*(--(in))))<<16L
; case 6: d1|=((DES_LONG)(*(--(in))))<< 8L; case 5: d1|=
((DES_LONG)(*(--(in)))); case 4: d0 =((DES_LONG)(*(--(in))))<<
24L; case 3: d0|=((DES_LONG)(*(--(in))))<<16L; case 2: d0
|=((DES_LONG)(*(--(in))))<< 8L; case 1: d0|=((DES_LONG)
(*(--(in)))); } };
64 in += n;
65 d0 ^= ti[0];
66 d1 ^= ti[1];
67 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); } };
68 out += n;
69 /*
70 * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
71 * gcc :-(
72 */
73 if (numbits == 32) {
74 v0 = v1;
75 v1 = d0;
76 } else if (numbits == 64) {
77 v0 = d0;
78 v1 = d1;
79 } else {
80#ifndef L_ENDIAN1
81 iv = &ovec[0];
82 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));
83 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));
84 l2c(d0, iv)(*((iv)++)=(unsigned char)(((d0) )&0xff), *((iv)++)=(unsigned
char)(((d0)>> 8L)&0xff), *((iv)++)=(unsigned char)
(((d0)>>16L)&0xff), *((iv)++)=(unsigned char)(((d0)
>>24L)&0xff));
85 l2c(d1, iv)(*((iv)++)=(unsigned char)(((d1) )&0xff), *((iv)++)=(unsigned
char)(((d1)>> 8L)&0xff), *((iv)++)=(unsigned char)
(((d1)>>16L)&0xff), *((iv)++)=(unsigned char)(((d1)
>>24L)&0xff));
86#else
87 sh[0] = v0, sh[1] = v1, sh[2] = d0, sh[3] = d1;
88#endif
89 if (rem == 0)
90 memmove(ovec, ovec + num, 8);
91 else
92 for (i = 0; i < 8; ++i)
93 ovec[i] = ovec[i + num] << rem |
94 ovec[i + num + 1] >> (8 - rem);
95#ifdef L_ENDIAN1
96 v0 = sh[0], v1 = sh[1];
97#else
98 iv = &ovec[0];
99 c2l(iv, v0)(v0 =((DES_LONG)(*((iv)++))) , v0|=((DES_LONG)(*((iv)++)))<<
8L, v0|=((DES_LONG)(*((iv)++)))<<16L, v0|=((DES_LONG)(
*((iv)++)))<<24L);
100 c2l(iv, v1)(v1 =((DES_LONG)(*((iv)++))) , v1|=((DES_LONG)(*((iv)++)))<<
8L, v1|=((DES_LONG)(*((iv)++)))<<16L, v1|=((DES_LONG)(
*((iv)++)))<<24L);
101#endif
102 }
103 }
104 } else {
105 while (l >= (unsigned long)n) {
106 l -= n;
107 ti[0] = v0;
108 ti[1] = v1;
109 DES_encrypt1((DES_LONG *)ti, schedule, DES_ENCRYPT1);
110 c2ln(in, d0, d1, n){ in+=n; d0=d1=0; switch (n) { case 8: d1 =((DES_LONG)(*(--(in
))))<<24L; case 7: d1|=((DES_LONG)(*(--(in))))<<16L
; case 6: d1|=((DES_LONG)(*(--(in))))<< 8L; case 5: d1|=
((DES_LONG)(*(--(in)))); case 4: d0 =((DES_LONG)(*(--(in))))<<
24L; case 3: d0|=((DES_LONG)(*(--(in))))<<16L; case 2: d0
|=((DES_LONG)(*(--(in))))<< 8L; case 1: d0|=((DES_LONG)
(*(--(in)))); } };
111 in += n;
112 /*
113 * 30-08-94 - eay - changed because l>>32 and l<<32 are bad under
114 * gcc :-(
115 */
116 if (numbits == 32) {
117 v0 = v1;
118 v1 = d0;
119 } else if (numbits == 64) {
120 v0 = d0;
121 v1 = d1;
122 } else {
123#ifndef L_ENDIAN1
124 iv = &ovec[0];
125 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));
126 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));
127 l2c(d0, iv)(*((iv)++)=(unsigned char)(((d0) )&0xff), *((iv)++)=(unsigned
char)(((d0)>> 8L)&0xff), *((iv)++)=(unsigned char)
(((d0)>>16L)&0xff), *((iv)++)=(unsigned char)(((d0)
>>24L)&0xff));
128 l2c(d1, iv)(*((iv)++)=(unsigned char)(((d1) )&0xff), *((iv)++)=(unsigned
char)(((d1)>> 8L)&0xff), *((iv)++)=(unsigned char)
(((d1)>>16L)&0xff), *((iv)++)=(unsigned char)(((d1)
>>24L)&0xff));
129#else
130 sh[0] = v0, sh[1] = v1, sh[2] = d0, sh[3] = d1;
131#endif
132 if (rem == 0)
133 memmove(ovec, ovec + num, 8);
134 else
135 for (i = 0; i < 8; ++i)
136 ovec[i] = ovec[i + num] << rem |
137 ovec[i + num + 1] >> (8 - rem);
138#ifdef L_ENDIAN1
139 v0 = sh[0], v1 = sh[1];
140#else
141 iv = &ovec[0];
142 c2l(iv, v0)(v0 =((DES_LONG)(*((iv)++))) , v0|=((DES_LONG)(*((iv)++)))<<
8L, v0|=((DES_LONG)(*((iv)++)))<<16L, v0|=((DES_LONG)(
*((iv)++)))<<24L);
143 c2l(iv, v1)(v1 =((DES_LONG)(*((iv)++))) , v1|=((DES_LONG)(*((iv)++)))<<
8L, v1|=((DES_LONG)(*((iv)++)))<<16L, v1|=((DES_LONG)(
*((iv)++)))<<24L);
144#endif
145 }
146 d0 ^= ti[0];
147 d1 ^= ti[1];
148 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); } };
149 out += n;
150 }
151 }
152 iv = &(*ivec)[0];
153 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));
154 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));
155 v0 = v1 = d0 = d1 = ti[0] = ti[1] = 0;
Although the value stored to 'd0' is used in the enclosing expression, the value is never actually read from 'd0'
156}