我正在使用加密库，并且正在尝试使用这些库创建简单的密码算法。我使用MSDN的Deriving a Session Key from a Password通过传递“用户名”来生成密钥，但是我不确定如何获取密钥以针对我的算法进行测试。该算法采用上面传递的用户名并生成密钥。我尝试使用CryptDeriveKey和CryptGetKeyParam，但是它不返回密钥。
这又如何实现？
#include <stdio.h>
#include <string.h>
#include <conio.h>
#include <windows.h>
#include <Wincrypt.h>
#include <string.h>
#include <stdio.h>
#pragma comment( lib, "Advapi32.lib" )
#pragma comment( lib, "Rpcrt4.lib" )
#pragma comment( lib, "Ole32.lib" )
#pragma comment( lib, "Winhttp.lib" )
#pragma comment( lib, "Crypt32.lib" )
#include <tchar.h>
#include <stdio.h>
#pragma comment(lib, "crypt32.lib")
// Data to be encrypted.
//
#define PLAIN_TEXT TEXT("Michael Scott")
//
// Private key with exponent of one.
//
static BYTE PrivateKeyWithExponentOfOne[] =
{
0x07, 0x02, 0x00, 0x00, 0x00, 0xA4, 0x00, 0x00,
0x52, 0x53, 0x41, 0x32, 0x00, 0x02, 0x00, 0x00,
0x01, 0x00, 0x00, 0x00, 0xAB, 0xEF, 0xFA, 0xC6,
0x7D, 0xE8, 0xDE, 0xFB, 0x68, 0x38, 0x09, 0x92,
0xD9, 0x42, 0x7E, 0x6B, 0x89, 0x9E, 0x21, 0xD7,
0x52, 0x1C, 0x99, 0x3C, 0x17, 0x48, 0x4E, 0x3A,
0x44, 0x02, 0xF2, 0xFA, 0x74, 0x57, 0xDA, 0xE4,
0xD3, 0xC0, 0x35, 0x67, 0xFA, 0x6E, 0xDF, 0x78,
0x4C, 0x75, 0x35, 0x1C, 0xA0, 0x74, 0x49, 0xE3,
0x20, 0x13, 0x71, 0x35, 0x65, 0xDF, 0x12, 0x20,
0xF5, 0xF5, 0xF5, 0xC1, 0xED, 0x5C, 0x91, 0x36,
0x75, 0xB0, 0xA9, 0x9C, 0x04, 0xDB, 0x0C, 0x8C,
0xBF, 0x99, 0x75, 0x13, 0x7E, 0x87, 0x80, 0x4B,
0x71, 0x94, 0xB8, 0x00, 0xA0, 0x7D, 0xB7, 0x53,
0xDD, 0x20, 0x63, 0xEE, 0xF7, 0x83, 0x41, 0xFE,
0x16, 0xA7, 0x6E, 0xDF, 0x21, 0x7D, 0x76, 0xC0,
0x85, 0xD5, 0x65, 0x7F, 0x00, 0x23, 0x57, 0x45,
0x52, 0x02, 0x9D, 0xEA, 0x69, 0xAC, 0x1F, 0xFD,
0x3F, 0x8C, 0x4A, 0xD0,
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x64, 0xD5, 0xAA, 0xB1,
0xA6, 0x03, 0x18, 0x92, 0x03, 0xAA, 0x31, 0x2E,
0x48, 0x4B, 0x65, 0x20, 0x99, 0xCD, 0xC6, 0x0C,
0x15, 0x0C, 0xBF, 0x3E, 0xFF, 0x78, 0x95, 0x67,
0xB1, 0x74, 0x5B, 0x60,
0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
};
extern "C" int __cdecl _tmain(int argc, _TCHAR* argv[])
{
DWORD dwResult = 0;
HCRYPTPROV hProv = 0;
HCRYPTKEY hKey = 0;
HCRYPTKEY hSessionKey = 0;
BYTE* pbBlob = NULL;
DWORD cbBlob;
BYTE byData[] = PLAIN_TEXT;
DWORD cbData = sizeof(byData);
DWORD dwIndex;
__try
{
//
// Acquire context for default user.
//
if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, 0))
{
dwResult = GetLastError();
if (dwResult == NTE_BAD_KEYSET)
{
if (!CryptAcquireContext(&hProv, NULL, MS_DEF_PROV, PROV_RSA_FULL, CRYPT_NEWKEYSET))
{
dwResult = GetLastError();
_tprintf(TEXT("Error [0x%x]: CryptAcquireContext() failed.\n"), dwResult);
__leave;
}
}
else
{
dwResult = GetLastError();
__leave;
}
}
//
// Import the exponent-of-one private key.
//
if (!CryptImportKey(hProv,
PrivateKeyWithExponentOfOne,
sizeof(PrivateKeyWithExponentOfOne),
0, 0, &hKey))
{
dwResult = GetLastError();
_tprintf(TEXT("Error [0x%x]: CryptImportKey() failed.\n"), dwResult);
__leave;
}
_tprintf(TEXT("%p\n"), &hKey);
//
// Generate exportable session key.
//
if (!CryptGenKey(hProv, CALG_RC4, CRYPT_EXPORTABLE, &hSessionKey))
{
dwResult = GetLastError();
_tprintf(TEXT("Error [0x%x]: CryptGenKey() failed.\n"), dwResult);
__leave;
}
//printf("%04x\n", &hSessionKey);
//
// Display plain text.
//
_tprintf(TEXT("Original text = [%s]\n"), byData);
//
// Encrypt the data.
//
if (!CryptEncrypt(hSessionKey, 0, TRUE, 0, byData, &cbData, cbData))
{
dwResult = GetLastError();
_tprintf(TEXT("Error [0x%x]: CryptEncrypt() failed.\n"), dwResult);
__leave;
}
//
// Display encrypted text.
//
_tprintf(TEXT("Encrypted text = ["));
for (dwIndex = 0; dwIndex < cbData; dwIndex++)
{
_tprintf(TEXT("%hhx"), byData[dwIndex]);
}
_tprintf(TEXT("]\n"));
//
// Determine key blob size.
//
if (!CryptExportKey(hSessionKey, hKey, SIMPLEBLOB, 0, NULL, &cbBlob))
{
dwResult = GetLastError();
_tprintf(TEXT("Error [0x%x]: CryptExportKey() failed.\n"), dwResult);
__leave;
}
//
// Allocate memory for key blob.
//
if ((pbBlob = (BYTE*)LocalAlloc(LMEM_ZEROINIT, cbBlob)) == NULL)
{
dwResult = ERROR_NOT_ENOUGH_MEMORY;
_tprintf(TEXT("Error [0x%x]: LocalAlloc() failed.\n"), dwResult);
__leave;
}
//
// Export the session key. Resultant blob is the raw session key.
//
if (!CryptExportKey(hSessionKey, hKey, SIMPLEBLOB, 0, pbBlob, &cbBlob))
{
dwResult = GetLastError();
_tprintf(TEXT("Error [0x%x]: CryptExportKey() failed.\n"), dwResult);
__leave;
}
//
// Destroy the session key.
//
CryptDestroyKey(hSessionKey);
hSessionKey = 0;
//
// Import the session key back to decrypt the data.
//
if (!CryptImportKey(hProv, pbBlob, cbBlob, 0, 0, &hSessionKey))
{
dwResult = GetLastError();
_tprintf(TEXT("Error [0x%x]: CryptImportKey() failed.\n"), dwResult);
__leave;
}
//
// Decrypt the data.
//
if (!CryptDecrypt(hSessionKey, 0, TRUE, 0, byData, &cbData))
{
dwResult = GetLastError();
_tprintf(TEXT("Error [0x%x]: CryptDecrypt() failed.\n"), dwResult);
__leave;
}
//
// Make sure we got all the data back.
//
if (cbData != sizeof(byData) || _tcscmp((const char*)byData, PLAIN_TEXT) != 0)
{
_tprintf(TEXT("Error: Data was not decrypted correctly.\n"));
__leave;
}
//
// Display decrypted text.
//
_tprintf(TEXT("Decrypted text = [%s]\n"), byData);
}
__finally
{
//
// Release all allocated resources.
//
if (pbBlob)
LocalFree(pbBlob);
if (hSessionKey)
CryptDestroyKey(hSessionKey);
if (hKey)
CryptDestroyKey(hKey);
if (hProv)
CryptReleaseContext(hProv, 0);
}
return (int)dwResult;
}