CryptAPI RSA加密解密
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//下面的代码没有考虑源数据的长度问题，需要注意。// INCLUDES#include "stdio.h"#include "conio.h"#include "windows.h"#include "wincrypt.h"#include "tchar.h" // FUNCTIONSint Keys(_TCHAR* strPublicKeyFile, _TCHAR* strPrivateKeyFile);int Encrypt(_TCHAR* strPublicKeyFile, _TCHAR* strPlainFile, _TCHAR* strEncryptedFile);int Decrypt(_TCHAR* strPrivateKeyFile, _TCHAR* strEncryptedFile, _TCHAR* strPlainFile); // Mainint _tmain(int argc, _TCHAR* argv[]){ int iResult = 0; if ((argc == 4) && (_tcscmp(argv[1], _T("k")) == 0)) { // Generate a new key pair iResult = Keys(argv[2], argv[3]); } else if ((argc == 5) && (_tcscmp(argv[1], _T("e")) == 0)) { // Encrypt iResult = Encrypt(argv[2], argv[3], argv[4]); } else if ((argc == 5) && (_tcscmp(argv[1], _T("d"))== 0)) { // Decrypt iResult = Decrypt(argv[2], argv[3], argv[4]); } else { // Show usage _tprintf(_T("Usage:\n")); _tprintf(_T(" - New key pair: EncryptDecrypt k public_key_file private_key_file\n")); _tprintf(_T(" - Encrypt: EncryptDecrypt e public_key_file plain_file encrypted_file\n")); _tprintf(_T(" - Decrypt: EncryptDecrypt d private_key_file encrypted_file plain_file\n")); iResult = 1; } _tprintf(_T("\n<< Press any key to continue >>\n")); _getch(); return iResult;}// End of Main // Keysint Keys(_TCHAR* strPublicKeyFile, _TCHAR* strPrivateKeyFile){ // Variables HCRYPTPROV hCryptProv = NULL; HCRYPTKEY hKey = NULL; DWORD dwPublicKeyLen = 0; DWORD dwPrivateKeyLen = 0; BYTE* pbPublicKey = NULL; BYTE* pbPrivateKey = NULL; HANDLE hPublicKeyFile = NULL; HANDLE hPrivateKeyFile = NULL; DWORD lpNumberOfBytesWritten = 0; __try { // Acquire access to key container _tprintf(_T("CryptAcquireContext...\n")); if (!CryptAcquireContext(&hCryptProv, _T("AlejaCMa.EncryptDecrypt"), NULL, PROV_RSA_FULL, 0)) { // Error _tprintf(_T("CryptAcquireContext error 0x%x\n"), GetLastError()); // Try to create a new key container if (!CryptAcquireContext(&hCryptProv, _T("AlejaCMa.EncryptDecrypt"), NULL, PROV_RSA_FULL, CRYPT_NEWKEYSET)) { // Error _tprintf(_T("CryptAcquireContext error 0x%x\n"), GetLastError()); return 1; } } // Generate new key pair _tprintf(_T("CryptGenKey...\n")); if (!CryptGenKey(hCryptProv, AT_KEYEXCHANGE, CRYPT_ARCHIVABLE, &hKey)) { // Error _tprintf(_T("CryptGenKey error 0x%x\n"), GetLastError()); return 1; } // Get public key size _tprintf(_T("CryptExportKey...\n")); if (!CryptExportKey(hKey, NULL, PUBLICKEYBLOB, 0, NULL, &dwPublicKeyLen)) { // Error _tprintf(_T("CryptExportKey error 0x%x\n"), GetLastError()); return 1; } // Create a buffer for the public key _tprintf(_T("malloc...\n")); if (!(pbPublicKey = (BYTE *)malloc(dwPublicKeyLen))) { // Error _tprintf(_T("malloc error 0x%x\n"), GetLastError()); return 1; } // Get public key _tprintf(_T("CryptExportKey...\n")); if (!CryptExportKey(hKey, NULL, PUBLICKEYBLOB, 0, pbPublicKey, &dwPublicKeyLen)) { // Error _tprintf(_T("CryptExportKey error 0x%x\n"), GetLastError()); return 1; } // Get private key size _tprintf(_T("CryptExportKey...\n")); if (!CryptExportKey(hKey, NULL, PRIVATEKEYBLOB, 0, NULL, &dwPrivateKeyLen)) { // Error _tprintf(_T("CryptExportKey error 0x%x\n"), GetLastError()); return 1; } // Create a buffer for the private key _tprintf(_T("malloc...\n")); if (!(pbPrivateKey = (BYTE *)malloc(dwPrivateKeyLen))) { // Error _tprintf(_T("malloc error 0x%x\n"), GetLastError()); return 1; } // Get private key _tprintf(_T("CryptExportKey...\n")); if (!CryptExportKey(hKey, NULL, PRIVATEKEYBLOB, 0, pbPrivateKey, &dwPrivateKeyLen)) { // Error _tprintf(_T("CryptExportKey error 0x%x\n"), GetLastError()); return 1; } // Create a file to save the public key _tprintf(_T("CreateFile...\n")); if ((hPublicKeyFile = CreateFile( strPublicKeyFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL )) == INVALID_HANDLE_VALUE) { // Error _tprintf(_T("CreateFile error 0x%x\n"), GetLastError()); return 1; } // Write the public key to the file _tprintf(_T("WriteFile...\n")); if (!WriteFile( hPublicKeyFile, (LPCVOID)pbPublicKey, dwPublicKeyLen, &lpNumberOfBytesWritten, NULL )) { // Error _tprintf(_T("WriteFile error 0x%x\n"), GetLastError()); return 1; } // Create a file to save the private key _tprintf(_T("CreateFile...\n")); if ((hPrivateKeyFile = CreateFile( strPrivateKeyFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL )) == INVALID_HANDLE_VALUE) { // Error _tprintf(_T("CreateFile error 0x%x\n"), GetLastError()); return 1; } // Write the private key to the file _tprintf(_T("WriteFile...\n")); if (!WriteFile( hPrivateKeyFile, (LPCVOID)pbPrivateKey, dwPrivateKeyLen, &lpNumberOfBytesWritten, NULL )) { // Error _tprintf(_T("WriteFile error 0x%x\n"), GetLastError()); return 1; } return 0; } __finally { // Clean up if (!pbPublicKey) { _tprintf(_T("free...\n")); free(pbPublicKey); } if (!pbPrivateKey) { _tprintf(_T("free...\n")); free(pbPrivateKey); } if (hPublicKeyFile) { _tprintf(_T("CloseHandle...\n")); CloseHandle(hPublicKeyFile); } if (hPrivateKeyFile) { _tprintf(_T("CloseHandle...\n")); CloseHandle(hPrivateKeyFile); } if (hKey) { _tprintf(_T("CryptDestroyKey...\n")); CryptDestroyKey(hKey); } if (hCryptProv) { _tprintf(_T("CryptReleaseContext...\n")); CryptReleaseContext(hCryptProv, 0); } }}// End of Keys // Encryptint Encrypt(_TCHAR* strPublicKeyFile, _TCHAR* strPlainFile, _TCHAR* strEncryptedFile){ // Variables HCRYPTPROV hCryptProv = NULL; HCRYPTKEY hKey = NULL; DWORD dwPublicKeyLen = 0; DWORD dwDataLen = 0; DWORD dwEncryptedLen = 0; BYTE* pbPublicKey = NULL; BYTE* pbData = NULL; HANDLE hPublicKeyFile = NULL; HANDLE hEncryptedFile = NULL; HANDLE hPlainFile = NULL; DWORD lpNumberOfBytesWritten = 0; __try { // Acquire access to key container _tprintf(_T("CryptAcquireContext...\n")); if (!CryptAcquireContext(&hCryptProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT)) { // Error _tprintf(_T("CryptAcquireContext error 0x%x\n"), GetLastError()); return 1; } // Open public key file _tprintf(_T("CreateFile...\n")); if ((hPublicKeyFile = CreateFile( strPublicKeyFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL )) == INVALID_HANDLE_VALUE) { // Error _tprintf(_T("CreateFile error 0x%x\n"), GetLastError()); return 1; } // Get file size _tprintf(_T("GetFileSize...\n")); if ((dwPublicKeyLen = GetFileSize(hPublicKeyFile, NULL)) == INVALID_FILE_SIZE) { // Error _tprintf(_T("GetFileSize error 0x%x\n"), GetLastError()); return 1; } // Create a buffer for the public key _tprintf(_T("malloc...\n")); if (!(pbPublicKey = (BYTE *)malloc(dwPublicKeyLen))) { // Error _tprintf(_T("malloc error 0x%x\n"), GetLastError()); return 1; } // Read public key _tprintf(_T("ReadFile...\n")); if (!ReadFile(hPublicKeyFile, pbPublicKey, dwPublicKeyLen, &dwPublicKeyLen, NULL)) { // Error _tprintf(_T("ReadFile error 0x%x\n"), GetLastError()); return 1; } // Import public key _tprintf(_T("CryptImportKey...\n")); if (!CryptImportKey(hCryptProv, pbPublicKey, dwPublicKeyLen, 0, 0, &hKey)) { // Error _tprintf(_T("CryptImportKey error 0x%x\n"), GetLastError()); return 1; } // Open plain text file _tprintf(_T("CreateFile...\n")); if ((hPlainFile = CreateFile( strPlainFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL )) == INVALID_HANDLE_VALUE) { // Error _tprintf(_T("CreateFile error 0x%x\n"), GetLastError()); return 1; } // Get file size _tprintf(_T("GetFileSize...\n")); if ((dwDataLen = GetFileSize(hPlainFile, NULL)) == INVALID_FILE_SIZE) { // Error _tprintf(_T("GetFileSize error 0x%x\n"), GetLastError()); return 1; } // Create a buffer for the plain text _tprintf(_T("malloc...\n")); if (!(pbData = (BYTE *)malloc(dwDataLen))) { // Error _tprintf(_T("malloc error 0x%x\n"), GetLastError()); return 1; } // Read plain text _tprintf(_T("ReadFile...\n")); if (!ReadFile(hPlainFile, pbData, dwDataLen, &dwDataLen, NULL)) { // Error _tprintf(_T("ReadFile error 0x%x\n"), GetLastError()); return 1; } // Get lenght for encrypted data if (!CryptEncrypt(hKey, NULL, TRUE, 0, NULL, &dwEncryptedLen, 0)) { // Error _tprintf(_T("CryptEncrypt error 0x%x\n"), GetLastError()); return 1; } // Create a buffer for encrypted data _tprintf(_T("malloc...\n")); if (!(pbData = (BYTE *)realloc(pbData, dwEncryptedLen))) { // Error _tprintf(_T("malloc error 0x%x\n"), GetLastError()); return 1; } // Encrypt data if (!CryptEncrypt(hKey, NULL, TRUE, 0, pbData, &dwDataLen, dwEncryptedLen)) { // Error _tprintf(_T("CryptEncrypt error 0x%x\n"), GetLastError()); return 1; } // Create a file to save the encrypted data _tprintf(_T("CreateFile...\n")); if ((hEncryptedFile = CreateFile( strEncryptedFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL )) == INVALID_HANDLE_VALUE) { // Error _tprintf(_T("CreateFile error 0x%x\n"), GetLastError()); return 1; } // Write the public key to the file _tprintf(_T("WriteFile...\n")); if (!WriteFile( hEncryptedFile, (LPCVOID)pbData, dwDataLen, &lpNumberOfBytesWritten, NULL )) { // Error _tprintf(_T("WriteFile error 0x%x\n"), GetLastError()); return 1; } return 0; } __finally { // Clean up if (!pbPublicKey) { _tprintf(_T("free...\n")); free(pbPublicKey); } if (!pbData) { _tprintf(_T("free...\n")); free(pbData); } if (hPublicKeyFile) { _tprintf(_T("CloseHandle...\n")); CloseHandle(hPublicKeyFile); } if (hPlainFile) { _tprintf(_T("CloseHandle...\n")); CloseHandle(hPlainFile); } if (hEncryptedFile) { _tprintf(_T("CloseHandle...\n")); CloseHandle(hEncryptedFile); } if (hKey) { _tprintf(_T("CryptDestroyKey...\n")); CryptDestroyKey(hKey); } if (hCryptProv) { _tprintf(_T("CryptReleaseContext...\n")); CryptReleaseContext(hCryptProv, 0); } }}// End of Encrypt // Decryptint Decrypt(_TCHAR* strPrivateKeyFile, _TCHAR* strEncryptedFile, _TCHAR* strPlainFile){ // Variables HCRYPTPROV hCryptProv = NULL; HCRYPTKEY hKey = NULL; DWORD dwPrivateKeyLen = 0; DWORD dwDataLen = 0; BYTE* pbPrivateKey = NULL; BYTE* pbData = NULL; HANDLE hPrivateKeyFile = NULL; HANDLE hEncryptedFile = NULL; HANDLE hPlainFile = NULL; DWORD lpNumberOfBytesWritten = 0; __try { // Acquire access to key container _tprintf(_T("CryptAcquireContext...\n")); if (!CryptAcquireContext(&hCryptProv, _T("AlejaCMa.EncryptDecrypt"), NULL, PROV_RSA_FULL, 0)) { // Error _tprintf(_T("CryptAcquireContext error 0x%x\n"), GetLastError()); // Try to create a new key container if (!CryptAcquireContext(&hCryptProv, _T("AlejaCMa.EncryptDecrypt"), NULL, PROV_RSA_FULL, CRYPT_NEWKEYSET)) { // Error _tprintf(_T("CryptAcquireContext error 0x%x\n"), GetLastError()); return 1; } } // Open private key file _tprintf(_T("CreateFile...\n")); if ((hPrivateKeyFile = CreateFile( strPrivateKeyFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL )) == INVALID_HANDLE_VALUE) { // Error _tprintf(_T("CreateFile error 0x%x\n"), GetLastError()); return 1; } // Get file size _tprintf(_T("GetFileSize...\n")); if ((dwPrivateKeyLen = GetFileSize(hPrivateKeyFile, NULL)) == INVALID_FILE_SIZE) { // Error _tprintf(_T("GetFileSize error 0x%x\n"), GetLastError()); return 1; } // Create a buffer for the private key _tprintf(_T("malloc...\n")); if (!(pbPrivateKey = (BYTE *)malloc(dwPrivateKeyLen))) { // Error _tprintf(_T("malloc error 0x%x\n"), GetLastError()); return 1; } // Read private key _tprintf(_T("ReadFile...\n")); if (!ReadFile(hPrivateKeyFile, pbPrivateKey, dwPrivateKeyLen, &dwPrivateKeyLen, NULL)) { // Error _tprintf(_T("ReadFile error 0x%x\n"), GetLastError()); return 1; } // Import private key _tprintf(_T("CryptImportKey...\n")); if (!CryptImportKey(hCryptProv, pbPrivateKey, dwPrivateKeyLen, 0, 0, &hKey)) { // Error _tprintf(_T("CryptImportKey error 0x%x\n"), GetLastError()); return 1; } // Open encrypted file _tprintf(_T("CreateFile...\n")); if ((hEncryptedFile = CreateFile( strEncryptedFile, GENERIC_READ, FILE_SHARE_READ, NULL, OPEN_EXISTING, FILE_FLAG_SEQUENTIAL_SCAN, NULL )) == INVALID_HANDLE_VALUE) { // Error _tprintf(_T("CreateFile error 0x%x\n"), GetLastError()); return 1; } // Get file size _tprintf(_T("GetFileSize...\n")); if ((dwDataLen = GetFileSize(hEncryptedFile, NULL)) == INVALID_FILE_SIZE) { // Error _tprintf(_T("GetFileSize error 0x%x\n"), GetLastError()); return 1; } // Create a buffer for the encrypted data _tprintf(_T("malloc...\n")); if (!(pbData = (BYTE *)malloc(dwDataLen))) { // Error _tprintf(_T("malloc error 0x%x\n"), GetLastError()); return 1; } // Read encrypted data _tprintf(_T("ReadFile...\n")); if (!ReadFile(hEncryptedFile, pbData, dwDataLen, &dwDataLen, NULL)) { // Error _tprintf(_T("ReadFile error 0x%x\n"), GetLastError()); return 1; } // Get lenght for plain text if (!CryptDecrypt(hKey, NULL, TRUE, 0, pbData, &dwDataLen)) { // Error _tprintf(_T("CryptDecrypt error 0x%x\n"), GetLastError()); return 1; } // Create a file to save the plain text _tprintf(_T("CreateFile...\n")); if ((hPlainFile = CreateFile( strPlainFile, GENERIC_WRITE, 0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL )) == INVALID_HANDLE_VALUE) { // Error _tprintf(_T("CreateFile error 0x%x\n"), GetLastError()); return 1; } // Write the plain text the file _tprintf(_T("WriteFile...\n")); if (!WriteFile( hPlainFile, (LPCVOID)pbData, dwDataLen, &lpNumberOfBytesWritten, NULL )) { // Error _tprintf(_T("WriteFile error 0x%x\n"), GetLastError()); return 1; } return 0; } __finally { // Clean up if (!pbPrivateKey) { _tprintf(_T("free...\n")); free(pbPrivateKey); } if (!pbData) { _tprintf(_T("free...\n")); free(pbData); } if (hPrivateKeyFile) { _tprintf(_T("CloseHandle...\n")); CloseHandle(hPrivateKeyFile); } if (hEncryptedFile) { _tprintf(_T("CloseHandle...\n")); CloseHandle(hEncryptedFile); } if (hPlainFile) { _tprintf(_T("CloseHandle...\n")); CloseHandle(hPlainFile); } if (hKey) { _tprintf(_T("CryptDestroyKey...\n")); CryptDestroyKey(hKey); } if (hCryptProv) { _tprintf(_T("CryptReleaseContext...\n")); CryptReleaseContext(hCryptProv, 0); } }}// End of Decrypt 0 0
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