Question

我在CBC模式下使用AES算法加密文件。我有来自数据库的密钥。我正在尝试使用cryptopp 5.6.2库编译下面的代码。它在没有-Wall标志的情况下进行编译，但是当我启用该标志时，会出现警告。

#include <iostream>
#include <fstream>
#include <exception>
#include <sstream>

#include "cryptopp/modes.h"
#include "cryptopp/aes.h"
#include "cryptopp/filters.h"
#include "cryptopp/cryptlib.h"
#include "cryptopp/hex.h"
#include "cryptopp/filters.h"
#include "cryptopp/aes.h"
#include "cryptopp/ccm.h"
#include "cryptopp/files.h"

using namespace std;
using namespace CryptoPP;

int main(int argc, char* argv[])
{
    try
    {
        byte no[16]  ;
        byte noiv[16];
        std::string out;
        std::string fileName("./encrypted.txt");
        CBC_Mode<AES>::Decryption d;
        d.SetKeyWithIV(no, sizeof(no), noiv);
        CryptoPP::FileSource(fileName.c_str(), true, new StreamTransformationFilter(d, new CryptoPP::FileSink("decrypted.txt"), CryptoPP::StreamTransformationFilter::PKCS_PADDING));
    }
    catch (CryptoPP::Exception& e)
    {
        std::cout << std::endl << e.what() << std::endl;
    }
    return 0;
}

在启用-Wall标志

时获取以下错误

In file included from ./cryptopp_5.6.2/include/cryptopp/modes.h:12,
                 from poc.cpp:6:
./cryptopp_5.6.2/include/cryptopp/algparam.h: In constructor ‘CryptoPP::ConstByteArrayParameter::ConstByteArrayParameter(const T&, bool) [with T = std::basic_string<char, std::char_traits<char>, std::allocator<char> >]’:
./cryptopp_5.6.2/include/cryptopp/filters.h:793:   instantiated from here
./cryptopp_5.6.2/include/cryptopp/algparam.h:26: warning: unused variable ‘cryptopp_assert_26’
In file included from ./cryptopp_5.6.2/include/cryptopp/modes.h:12,
                 from poc.cpp:6:
./cryptopp_5.6.2/include/cryptopp/algparam.h: In member function ‘void CryptoPP::AlgorithmParametersTemplate<T>::MoveInto(void*) const [with T = std::ostream*]’:
poc.cpp:36:   instantiated from here
./cryptopp_5.6.2/include/cryptopp/algparam.h:322: warning: unused variable ‘p’
./cryptopp_5.6.2/include/cryptopp/algparam.h: In member function ‘void CryptoPP::AlgorithmParametersTemplate<T>::MoveInto(void*) const [with T = const wchar_t*]’:
poc.cpp:36:   instantiated from here
./cryptopp_5.6.2/include/cryptopp/algparam.h:322: warning: unused variable ‘p’
./cryptopp_5.6.2/include/cryptopp/algparam.h: In member function ‘void CryptoPP::AlgorithmParametersTemplate<T>::MoveInto(void*) const [with T = const char*]’:
poc.cpp:36:   instantiated from here
./cryptopp_5.6.2/include/cryptopp/algparam.h:322: warning: unused variable ‘p’
./cryptopp_5.6.2/include/cryptopp/algparam.h: In member function ‘void CryptoPP::AlgorithmParametersTemplate<T>::MoveInto(void*) const [with T = std::istream*]’:
poc.cpp:36:   instantiated from here
./cryptopp_5.6.2/include/cryptopp/algparam.h:322: warning: unused variable ‘p’
./cryptopp_5.6.2/include/cryptopp/algparam.h: In member function ‘void CryptoPP::AlgorithmParametersTemplate<T>::MoveInto(void*) const [with T = const int*]’:
poc.cpp:36:   instantiated from here
./cryptopp_5.6.2/include/cryptopp/algparam.h:322: warning: unused variable ‘p’
./cryptopp_5.6.2/include/cryptopp/algparam.h: In member function ‘void CryptoPP::AlgorithmParametersTemplate<T>::MoveInto(void*) const [with T = unsigned char]’:
poc.cpp:36:   instantiated from here
./cryptopp_5.6.2/include/cryptopp/algparam.h:322: warning: unused variable ‘p’
./cryptopp_5.6.2/include/cryptopp/algparam.h: In member function ‘void CryptoPP::AlgorithmParametersTemplate<T>::MoveInto(void*) const [with T = const byte*]’:
poc.cpp:36:   instantiated from here
./cryptopp_5.6.2/include/cryptopp/algparam.h:322: warning: unused variable ‘p’
./cryptopp_5.6.2/include/cryptopp/algparam.h: In member function ‘void CryptoPP::AlgorithmParametersTemplate<T>::MoveInto(void*) const [with T = CryptoPP::RandomNumberGenerator*]’:
poc.cpp:36:   instantiated from here
./cryptopp_5.6.2/include/cryptopp/algparam.h:322: warning: unused variable ‘p’
./cryptopp_5.6.2/include/cryptopp/misc.h: At global scope:
./cryptopp_5.6.2/include/cryptopp/misc.h:548: warning: ‘std::string CryptoPP::StringNarrow(const wchar_t*, bool)’ defined but not used

Answer 1

下面的代码使用cryptopp 5.6.2库...

5.6.2有点老了。我们正准备发布Crypto ++ 5.6.5。

它在没有-Wall标志的情况下编译，但是当我启用警告后面的那个标志时出现。
./cryptopp_5.6.2/include/cryptopp/algparam.h:322: warning: unused variable ‘p’

警告在大约18个月前被清除。它首次出现在Crypto ++ 5.6.3的发行版中。另请参阅Commit 5f25c736: Add CRYPTOPP_UNUSED to help supress unused variable warnings。

在启用-Wall标志时获取以下错误...

Crypto ++现在在GCC和兼容性下的-Wall -Wextra处是干净的。 MSC下的/W4也很干净。最后，它在Solaris的SunCC下干净。

如果有兴趣，这里是发布过程和安全门，我们需要通过发布（来自Release Process | Analysis Tools）：

编译器警告
Clang和GCC Sanitizers
Valgrind的
企业分析
Coverity的

目前，Coverity持有5.6.5。我们最近将Coverity覆盖范围扩展到Linux, Unix, OS X, and Windows（之前只有Linux）。 Coverity正在产生调查结果，我们正在努力解决这些问题。

使用cryptopp库编译时获取警告

1 个答案: