Bug Summary

File:out/../deps/openssl/openssl/crypto/rc2/rc2_cbc.c
Warning:line 90, column 35
Although the value stored to 'xor0' is used in the enclosing expression, the value is never actually read from 'xor0'

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 rc2_cbc.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/rc2/rc2_cbc.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 * RC2 low level APIs are deprecated for public use, but still ok for internal
12 * use.
13 */
14#include "internal/deprecated.h"
15
16#include <openssl/rc2.h>
17#include "rc2_local.h"
18
19void RC2_cbc_encrypt(const unsigned char *in, unsigned char *out, long length,
20 RC2_KEY *ks, unsigned char *iv, int encrypt)
21{
22 register unsigned long tin0, tin1;
23 register unsigned long tout0, tout1, xor0, xor1;
24 register long l = length;
25 unsigned long tin[2];
26
27 if (encrypt) {
28 c2l(iv, tout0)(tout0 =((unsigned long)(*((iv)++))) , tout0|=((unsigned long
)(*((iv)++)))<< 8L, tout0|=((unsigned long)(*((iv)++)))
<<16L, tout0|=((unsigned long)(*((iv)++)))<<24L);
29 c2l(iv, tout1)(tout1 =((unsigned long)(*((iv)++))) , tout1|=((unsigned long
)(*((iv)++)))<< 8L, tout1|=((unsigned long)(*((iv)++)))
<<16L, tout1|=((unsigned long)(*((iv)++)))<<24L);
30 iv -= 8;
31 for (l -= 8; l >= 0; l -= 8) {
32 c2l(in, tin0)(tin0 =((unsigned long)(*((in)++))) , tin0|=((unsigned long)(
*((in)++)))<< 8L, tin0|=((unsigned long)(*((in)++)))<<
16L, tin0|=((unsigned long)(*((in)++)))<<24L);
33 c2l(in, tin1)(tin1 =((unsigned long)(*((in)++))) , tin1|=((unsigned long)(
*((in)++)))<< 8L, tin1|=((unsigned long)(*((in)++)))<<
16L, tin1|=((unsigned long)(*((in)++)))<<24L);
34 tin0 ^= tout0;
35 tin1 ^= tout1;
36 tin[0] = tin0;
37 tin[1] = tin1;
38 RC2_encrypt(tin, ks);
39 tout0 = tin[0];
40 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));
41 tout1 = tin[1];
42 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));
43 }
44 if (l != -8) {
45 c2ln(in, tin0, tin1, l + 8){ in+=l + 8; tin0=tin1=0; switch (l + 8) { case 8: tin1 =((unsigned
long)(*(--(in))))<<24L; case 7: tin1|=((unsigned long)
(*(--(in))))<<16L; case 6: tin1|=((unsigned long)(*(--(
in))))<< 8L; case 5: tin1|=((unsigned long)(*(--(in))))
; case 4: tin0 =((unsigned long)(*(--(in))))<<24L; case
3: tin0|=((unsigned long)(*(--(in))))<<16L; case 2: tin0
|=((unsigned long)(*(--(in))))<< 8L; case 1: tin0|=((unsigned
long)(*(--(in)))); } };
46 tin0 ^= tout0;
47 tin1 ^= tout1;
48 tin[0] = tin0;
49 tin[1] = tin1;
50 RC2_encrypt(tin, ks);
51 tout0 = tin[0];
52 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));
53 tout1 = tin[1];
54 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));
55 }
56 l2c(tout0, iv)(*((iv)++)=(unsigned char)(((tout0) )&0xff), *((iv)++)=(unsigned
char)(((tout0)>> 8L)&0xff), *((iv)++)=(unsigned char
)(((tout0)>>16L)&0xff), *((iv)++)=(unsigned char)((
(tout0)>>24L)&0xff));
57 l2c(tout1, iv)(*((iv)++)=(unsigned char)(((tout1) )&0xff), *((iv)++)=(unsigned
char)(((tout1)>> 8L)&0xff), *((iv)++)=(unsigned char
)(((tout1)>>16L)&0xff), *((iv)++)=(unsigned char)((
(tout1)>>24L)&0xff));
58 } else {
59 c2l(iv, xor0)(xor0 =((unsigned long)(*((iv)++))) , xor0|=((unsigned long)(
*((iv)++)))<< 8L, xor0|=((unsigned long)(*((iv)++)))<<
16L, xor0|=((unsigned long)(*((iv)++)))<<24L);
60 c2l(iv, xor1)(xor1 =((unsigned long)(*((iv)++))) , xor1|=((unsigned long)(
*((iv)++)))<< 8L, xor1|=((unsigned long)(*((iv)++)))<<
16L, xor1|=((unsigned long)(*((iv)++)))<<24L);
61 iv -= 8;
62 for (l -= 8; l >= 0; l -= 8) {
63 c2l(in, tin0)(tin0 =((unsigned long)(*((in)++))) , tin0|=((unsigned long)(
*((in)++)))<< 8L, tin0|=((unsigned long)(*((in)++)))<<
16L, tin0|=((unsigned long)(*((in)++)))<<24L);
64 tin[0] = tin0;
65 c2l(in, tin1)(tin1 =((unsigned long)(*((in)++))) , tin1|=((unsigned long)(
*((in)++)))<< 8L, tin1|=((unsigned long)(*((in)++)))<<
16L, tin1|=((unsigned long)(*((in)++)))<<24L);
66 tin[1] = tin1;
67 RC2_decrypt(tin, ks);
68 tout0 = tin[0] ^ xor0;
69 tout1 = tin[1] ^ xor1;
70 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));
71 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));
72 xor0 = tin0;
73 xor1 = tin1;
74 }
75 if (l != -8) {
76 c2l(in, tin0)(tin0 =((unsigned long)(*((in)++))) , tin0|=((unsigned long)(
*((in)++)))<< 8L, tin0|=((unsigned long)(*((in)++)))<<
16L, tin0|=((unsigned long)(*((in)++)))<<24L);
77 tin[0] = tin0;
78 c2l(in, tin1)(tin1 =((unsigned long)(*((in)++))) , tin1|=((unsigned long)(
*((in)++)))<< 8L, tin1|=((unsigned long)(*((in)++)))<<
16L, tin1|=((unsigned long)(*((in)++)))<<24L);
79 tin[1] = tin1;
80 RC2_decrypt(tin, ks);
81 tout0 = tin[0] ^ xor0;
82 tout1 = tin[1] ^ xor1;
83 l2cn(tout0, tout1, out, l + 8){ out+=l + 8; switch (l + 8) { 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); } };
84 xor0 = tin0;
85 xor1 = tin1;
86 }
87 l2c(xor0, iv)(*((iv)++)=(unsigned char)(((xor0) )&0xff), *((iv)++)=(unsigned
char)(((xor0)>> 8L)&0xff), *((iv)++)=(unsigned char
)(((xor0)>>16L)&0xff), *((iv)++)=(unsigned char)(((
xor0)>>24L)&0xff));
88 l2c(xor1, iv)(*((iv)++)=(unsigned char)(((xor1) )&0xff), *((iv)++)=(unsigned
char)(((xor1)>> 8L)&0xff), *((iv)++)=(unsigned char
)(((xor1)>>16L)&0xff), *((iv)++)=(unsigned char)(((
xor1)>>24L)&0xff));
89 }
90 tin0 = tin1 = tout0 = tout1 = xor0 = xor1 = 0;
Although the value stored to 'xor0' is used in the enclosing expression, the value is never actually read from 'xor0'
91 tin[0] = tin[1] = 0;
92}
93
94void RC2_encrypt(unsigned long *d, RC2_KEY *key)
95{
96 int i, n;
97 register RC2_INT *p0, *p1;
98 register RC2_INT x0, x1, x2, x3, t;
99 unsigned long l;
100
101 l = d[0];
102 x0 = (RC2_INT) l & 0xffff;
103 x1 = (RC2_INT) (l >> 16L);
104 l = d[1];
105 x2 = (RC2_INT) l & 0xffff;
106 x3 = (RC2_INT) (l >> 16L);
107
108 n = 3;
109 i = 5;
110
111 p0 = p1 = &(key->data[0]);
112 for (;;) {
113 t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff;
114 x0 = (t << 1) | (t >> 15);
115 t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff;
116 x1 = (t << 2) | (t >> 14);
117 t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff;
118 x2 = (t << 3) | (t >> 13);
119 t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff;
120 x3 = (t << 5) | (t >> 11);
121
122 if (--i == 0) {
123 if (--n == 0)
124 break;
125 i = (n == 2) ? 6 : 5;
126
127 x0 += p1[x3 & 0x3f];
128 x1 += p1[x0 & 0x3f];
129 x2 += p1[x1 & 0x3f];
130 x3 += p1[x2 & 0x3f];
131 }
132 }
133
134 d[0] =
135 (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L);
136 d[1] =
137 (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L);
138}
139
140void RC2_decrypt(unsigned long *d, RC2_KEY *key)
141{
142 int i, n;
143 register RC2_INT *p0, *p1;
144 register RC2_INT x0, x1, x2, x3, t;
145 unsigned long l;
146
147 l = d[0];
148 x0 = (RC2_INT) l & 0xffff;
149 x1 = (RC2_INT) (l >> 16L);
150 l = d[1];
151 x2 = (RC2_INT) l & 0xffff;
152 x3 = (RC2_INT) (l >> 16L);
153
154 n = 3;
155 i = 5;
156
157 p0 = &(key->data[63]);
158 p1 = &(key->data[0]);
159 for (;;) {
160 t = ((x3 << 11) | (x3 >> 5)) & 0xffff;
161 x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff;
162 t = ((x2 << 13) | (x2 >> 3)) & 0xffff;
163 x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff;
164 t = ((x1 << 14) | (x1 >> 2)) & 0xffff;
165 x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff;
166 t = ((x0 << 15) | (x0 >> 1)) & 0xffff;
167 x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff;
168
169 if (--i == 0) {
170 if (--n == 0)
171 break;
172 i = (n == 2) ? 6 : 5;
173
174 x3 = (x3 - p1[x2 & 0x3f]) & 0xffff;
175 x2 = (x2 - p1[x1 & 0x3f]) & 0xffff;
176 x1 = (x1 - p1[x0 & 0x3f]) & 0xffff;
177 x0 = (x0 - p1[x3 & 0x3f]) & 0xffff;
178 }
179 }
180
181 d[0] =
182 (unsigned long)(x0 & 0xffff) | ((unsigned long)(x1 & 0xffff) << 16L);
183 d[1] =
184 (unsigned long)(x2 & 0xffff) | ((unsigned long)(x3 & 0xffff) << 16L);
185}