【发布时间】：2019-12-31 05:24:37
【问题描述】：
我尝试编译一个应用程序来加密一些文件，但是当我尝试编译时遇到了问题。一切看起来都不错，但我不知道为什么会出现此错误。
我的错误是：
Error LNK2001 unresolved external symbol "public: __thiscall CryptoPP::CRC32::CRC32(void)" (??0CRC32@CryptoPP@@QAE@XZ) FoxFs C:\Users\lazar\Desktop\eph2_live_src\Sources\X_thirdparty_src\FoxFS\FoxFS\FoxFS\ArchiveWriter.obj 1
我的代码/行也有问题：
CryptoPP::CRC32 crc;
crc.CalculateDigest(reinterpret_cast<unsigned char*>(&index), reinterpret_cast<const unsigned char*>(fname.c_str()), fname.length());
我的完整代码：
#include "ArchiveWriter.h"
#include "../src/config.h"
#include "../cryptopp/modes.h"
#include "../cryptopp/aes.h"
#include "../cryptopp/crc.h"
#include "../cryptopp/osrng.h"
#include <boost/crc.hpp>
#pragma comment( lib, "cryptopp.lib" )
ArchiveWriter::ArchiveWriter()
{
#if defined(_WIN32) || defined(_WIN64) || defined(WIN32) || defined(WIN64)
keys = INVALID_HANDLE_VALUE;
file = INVALID_HANDLE_VALUE;
#else
keys = -1;
file = -1;
#endif
}
ArchiveWriter::~ArchiveWriter() { close(); }
bool ArchiveWriter::create(const char* filename, const char* keyfile)
{
close();
CryptoPP::AutoSeededRandomPool rng;
unsigned char key[32], iv[32];
FoxFS::TArchiveHeader header;
header.magic = FOXFS_MAGIC;
rng.GenerateBlock(header.key, 32);
rng.GenerateBlock(header.iv, 32);
rng.GenerateBlock(key, 32);
rng.GenerateBlock(iv, 32);
#if defined(_WIN32) || defined(_WIN64) || defined(WIN32) || defined(WIN64)
if (keyfile)
{
keys = CreateFileA(keyfile, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if (keys == INVALID_HANDLE_VALUE)
{
return false;
}
}
file = CreateFileA(filename, GENERIC_WRITE, 0, 0, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
if (file == INVALID_HANDLE_VALUE)
{
if (keys != INVALID_HANDLE_VALUE)
{
CloseHandle(keys);
keys = INVALID_HANDLE_VALUE;
}
return false;
}
DWORD dwWritten;
WriteFile(file, &header, sizeof(header), &dwWritten, 0);
if (keys != INVALID_HANDLE_VALUE)
{
// write magic number?
WriteFile(keys, key, 32, &dwWritten, 0);
WriteFile(keys, iv, 32, &dwWritten, 0);
for (int i = 0; i < 4; ++i)
{
reinterpret_cast<unsigned long long*>(this->key)[i] = reinterpret_cast<unsigned long long*>(key)[i] ^ reinterpret_cast<unsigned long long*>(header.key)[i];
reinterpret_cast<unsigned long long*>(this->iv)[i] = reinterpret_cast<unsigned long long*>(iv)[i] ^ reinterpret_cast<unsigned long long*>(header.iv)[i];
}
}
else
{
memcpy(this->key, header.key, 32);
memcpy(this->iv, header.iv, 32);
}
#else
if (keyfile)
{
keys = ::open(keyfile, O_CREAT | O_TRUNC | O_WRONLY, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
if (keys == -1)
{
return false;
}
}
file = ::open(filename, O_CREAT | O_TRUNC | O_WRONLY, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
if (file == -1)
{
if (keys != -1)
{
::close(keys);
keys = -1;
}
return false;
}
write(file, &header, sizeof(header));
if (keys != -1)
{
// write magic number?
write(keys, key, 32);
write(keys, iv, 32);
for (int i = 0; i < 4; ++i)
{
reinterpret_cast<unsigned long long*>(this->key)[i] = reinterpret_cast<unsigned long long*>(key)[i] ^ reinterpret_cast<unsigned long long*>(header.key)[i];
reinterpret_cast<unsigned long long*>(this->iv)[i] = reinterpret_cast<unsigned long long*>(iv)[i] ^ reinterpret_cast<unsigned long long*>(header.iv)[i];
}
}
else
{
memcpy(this->key, header.key, 32);
memcpy(this->iv, header.iv, 32);
}
#endif
return true;
}
void ArchiveWriter::close()
{
#if defined(_WIN32) || defined(_WIN64) || defined(WIN32) || defined(WIN64)
if (keys != INVALID_HANDLE_VALUE)
{
CloseHandle(keys);
keys = INVALID_HANDLE_VALUE;
}
if (file != INVALID_HANDLE_VALUE)
{
CloseHandle(file);
file = INVALID_HANDLE_VALUE;
}
#else
if (keys != -1)
{
::close(keys);
keys = -1;
}
if (file != -1)
{
::close(file);
file = -1;
}
#endif
}
bool ArchiveWriter::add(const char* filename, unsigned int decompressed, unsigned int compressed, unsigned int hash, const void* data)
{
unsigned int index = 0;
std::string fname = filename;
transform(fname.begin(), fname.end(), fname.begin(), tolower);
for (int i = 0; i < fname.length(); ++i)
{
if (fname[i] == '\\')
{
fname[i] = '/';
}
}
CryptoPP::CRC32 crc;
crc.CalculateDigest(reinterpret_cast<unsigned char*>(&index), reinterpret_cast<const unsigned char*>(fname.c_str()), fname.length());
unsigned short namelen = strlen(filename);
FoxFS::TArchiveEntry entry;
entry.decompressed = decompressed;
entry.hash = hash;
entry.offset = sizeof(entry);
entry.size = compressed;
entry.name = index;
std::string fn = filename;
transform(fn.begin(), fn.end(), fn.begin(), tolower);
for (int i = 0; i < fn.length(); ++i)
{
if (fn[i] == '\\')
{
fn[i] = '/';
}
}
CryptoPP::CFB_Mode<CryptoPP::AES>::Encryption encoder(this->key, 32, this->iv);
encoder.ProcessData(const_cast<unsigned char*>(reinterpret_cast<const unsigned char*>(data)), reinterpret_cast<const unsigned char*>(data), compressed);
#if defined(_WIN32) || defined(_WIN64) || defined(WIN32) || defined(WIN64)
DWORD dwWritten;
WriteFile(keys, &namelen, sizeof(namelen), &dwWritten, 0);
WriteFile(keys, filename, namelen, &dwWritten, 0);
WriteFile(keys, &hash, sizeof(hash), &dwWritten, 0);
LARGE_INTEGER m, p;
m.QuadPart = 0;
SetFilePointerEx(file, m, &p, FILE_CURRENT);
entry.offset += p.QuadPart;
WriteFile(file, &entry, sizeof(entry), &dwWritten, 0);
WriteFile(file, data, compressed, &dwWritten, 0);
#else
write(keys, &namelen, sizeof(namelen));
write(keys, filename, namelen);
write(keys, &hash, sizeof(hash));
entry.offset += lseek(file, 0, SEEK_CUR);
write(file, &entry, sizeof(entry));
write(file, data, compressed);
#endif
return true;
}
如果删除Cryptopp::CRC32 crc 和下一层，我的构建工作。
【问题讨论】：
-
这是很多代码。如果您生成产生错误的最小可能程序，您将获得更好的答案。
标签： c++ windows linker-errors crc crypto++