Bug Summary

File:out/../deps/openssl/openssl/crypto/cast/c_ofb64.c
Warning:line 65, column 9
Although the value stored to 'v0' is used in the enclosing expression, the value is never actually read from 'v0'

Annotated Source Code

Press '?' to see keyboard shortcuts

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 c_ofb64.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/cast/c_ofb64.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 * CAST low level APIs are deprecated for public use, but still ok for
12 * internal use.
13 */
14#include "internal/deprecated.h"
15
16#include <openssl/cast.h>
17#include "cast_local.h"
18
19/*
20 * The input and output encrypted as though 64bit ofb mode is being used.
21 * The extra state information to record how much of the 64bit block we have
22 * used is contained in *num;
23 */
24void CAST_ofb64_encrypt(const unsigned char *in, unsigned char *out,
25 long length, const CAST_KEY *schedule,
26 unsigned char *ivec, int *num)
27{
28 register CAST_LONGunsigned int v0, v1, t;
29 register int n = *num;
30 register long l = length;
31 unsigned char d[8];
32 register char *dp;
33 CAST_LONGunsigned int ti[2];
34 unsigned char *iv;
35 int save = 0;
36
37 iv = ivec;
38 n2l(iv, v0)(v0 =((unsigned long)(*((iv)++)))<<24L, v0|=((unsigned long
)(*((iv)++)))<<16L, v0|=((unsigned long)(*((iv)++)))<<
8L, v0|=((unsigned long)(*((iv)++))))
;
39 n2l(iv, v1)(v1 =((unsigned long)(*((iv)++)))<<24L, v1|=((unsigned long
)(*((iv)++)))<<16L, v1|=((unsigned long)(*((iv)++)))<<
8L, v1|=((unsigned long)(*((iv)++))))
;
40 ti[0] = v0;
41 ti[1] = v1;
42 dp = (char *)d;
43 l2n(v0, dp)(*((dp)++)=(unsigned char)(((v0)>>24L)&0xff), *((dp
)++)=(unsigned char)(((v0)>>16L)&0xff), *((dp)++)=(
unsigned char)(((v0)>> 8L)&0xff), *((dp)++)=(unsigned
char)(((v0) )&0xff))
;
44 l2n(v1, dp)(*((dp)++)=(unsigned char)(((v1)>>24L)&0xff), *((dp
)++)=(unsigned char)(((v1)>>16L)&0xff), *((dp)++)=(
unsigned char)(((v1)>> 8L)&0xff), *((dp)++)=(unsigned
char)(((v1) )&0xff))
;
45 while (l--) {
46 if (n == 0) {
47 CAST_encrypt((CAST_LONGunsigned int *)ti, schedule);
48 dp = (char *)d;
49 t = ti[0];
50 l2n(t, dp)(*((dp)++)=(unsigned char)(((t)>>24L)&0xff), *((dp)
++)=(unsigned char)(((t)>>16L)&0xff), *((dp)++)=(unsigned
char)(((t)>> 8L)&0xff), *((dp)++)=(unsigned char)(
((t) )&0xff))
;
51 t = ti[1];
52 l2n(t, dp)(*((dp)++)=(unsigned char)(((t)>>24L)&0xff), *((dp)
++)=(unsigned char)(((t)>>16L)&0xff), *((dp)++)=(unsigned
char)(((t)>> 8L)&0xff), *((dp)++)=(unsigned char)(
((t) )&0xff))
;
53 save++;
54 }
55 *(out++) = *(in++) ^ d[n];
56 n = (n + 1) & 0x07;
57 }
58 if (save) {
59 v0 = ti[0];
60 v1 = ti[1];
61 iv = ivec;
62 l2n(v0, iv)(*((iv)++)=(unsigned char)(((v0)>>24L)&0xff), *((iv
)++)=(unsigned char)(((v0)>>16L)&0xff), *((iv)++)=(
unsigned char)(((v0)>> 8L)&0xff), *((iv)++)=(unsigned
char)(((v0) )&0xff))
;
63 l2n(v1, iv)(*((iv)++)=(unsigned char)(((v1)>>24L)&0xff), *((iv
)++)=(unsigned char)(((v1)>>16L)&0xff), *((iv)++)=(
unsigned char)(((v1)>> 8L)&0xff), *((iv)++)=(unsigned
char)(((v1) )&0xff))
;
64 }
65 t = v0 = v1 = ti[0] = ti[1] = 0;
Although the value stored to 'v0' is used in the enclosing expression, the value is never actually read from 'v0'
66 *num = n;
67}