本文共 5849 字，大约阅读时间需要 19 分钟。

前言

看见一个Demo中有使用CryptAPI加密的代码.

查了资料，先写一个能用的CryptAPI加密例子, 预测一下Demo中的CryptAPI的调用流程.

等还原完，如果Demo写的有特色, 再整理一个Demo玩.

试验

// @file rsaEncrypt\hw.cpp//#include "stdafx.h"#ifndef _WIN32_WINNT        // Allow use of features specific to Windows 2000 or later.                   #define _WIN32_WINNT 0x0500 // Change this to the appropriate value to target other versions of Windows.#endif#include 
   
    #include 
    
     #include 
     
      #include 
      
       #include 
       
        #include 
        
         #pragma comment(lib, "Crypt32")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,};int _tmain(int argc, _TCHAR* argv[]){ HCRYPTPROV hProv = NULL; HCRYPTKEY hPrivateKey = NULL; HCRYPTKEY hPublicKey = NULL; HCRYPTKEY hSessionKey = NULL; BOOL bStatus = FALSE; const char* szPassword = "password"; DWORD dwPasswordLen = (DWORD) strlen(szPassword); LPBYTE pEncryptedData = NULL; DWORD i, dwKeyLen = 0, dwValLen = 0; DWORD dwEncryptedDataLen = 0; /* * We suppose here that the default container exists and * that it contains an RSA exchange key pair . */ bStatus = CryptAcquireContext(&hProv, NULL, /* default container */ MS_DEF_PROV, PROV_RSA_FULL, 0); if (!bStatus) { printf("CryptAcquireContext failed with error 0x%.8X\n", GetLastError()); goto error; } // 导入密钥 if (!CryptImportKey(hProv, PrivateKeyWithExponentOfOne, sizeof(PrivateKeyWithExponentOfOne), 0, 0, &hPrivateKey)) { printf("Error CryptImportKey() failed. 0x%.8X\n", GetLastError()); goto error; } /* // 产生会话密钥 if (!CryptGenKey(hProv, CALG_RSA_KEYX, CRYPT_EXPORTABLE, &hSessionKey)) { printf("Error CryptGenKey() failed. 0x%.8X\n", GetLastError()); goto error; } */ // 得到公钥 bStatus = CryptGetUserKey(hProv, AT_KEYEXCHANGE, &hPublicKey); if (!bStatus) { printf("CryptGetUserKey failed with error 0x%.8X\n", GetLastError()); goto error; } /* * get the size of the key */ dwValLen = sizeof(DWORD); bStatus = CryptGetKeyParam(hPublicKey, KP_KEYLEN, (LPBYTE) &dwKeyLen, &dwValLen, 0); if (!bStatus) { printf("CryptGetKeyParam failed with error 0x%.8X\n", GetLastError()); goto error; } /* * Allocate input/output buffer */ dwKeyLen = (dwKeyLen + 7) / 8; /* tranform to bytes length */ pEncryptedData = (LPBYTE) LocalAlloc(0, dwKeyLen); if (!pEncryptedData) { printf("LocalAlloc failed with error 0x%.8X\n", GetLastError()); goto error; } /* * copy password to the buffer */ ZeroMemory(pEncryptedData, dwKeyLen); CopyMemory(pEncryptedData, szPassword, dwPasswordLen); dwEncryptedDataLen = dwPasswordLen; bStatus = CryptEncrypt(hPublicKey, NULL, TRUE, 0, pEncryptedData, &dwEncryptedDataLen, dwKeyLen); if (!bStatus) { printf("CryptEncrypt failed with error 0x%.8X\n", GetLastError()); goto error; } printf("Password encrypted successfully :\n\tlength = %d bytes.\n\tValue = ", (int) dwEncryptedDataLen); for (i = 0; i < dwEncryptedDataLen; i++) { printf("%.2X", pEncryptedData[i]); } printf("\n\n"); /* * verifying encryption result */ printf("Verifying encryption result...\r\n"); // 换成 hPublicKey 也能解开, 堆成加密么? bStatus = CryptDecrypt(hPrivateKey, NULL, TRUE, 0, pEncryptedData, &dwEncryptedDataLen); if (!bStatus) { printf("CryptDecrypt failed with error 0x%.8X\n", GetLastError()); goto error; } if ((dwEncryptedDataLen != dwPasswordLen) || (0 != memcmp(pEncryptedData, szPassword, dwPasswordLen))) { printf("\nVerification failed!!\n"); } else { printf("Decrypt result = %s\r\n", (char*)pEncryptedData); printf("\nSucess.\n"); } error: if (NULL != pEncryptedData) { LocalFree(pEncryptedData); pEncryptedData = NULL; } if (NULL != hPublicKey) { CryptDestroyKey(hPublicKey); hPublicKey = NULL; } if (NULL != hPrivateKey) { CryptDestroyKey(hPrivateKey); hPrivateKey = NULL; } if (NULL != hProv) { CryptReleaseContext(hProv, 0); hProv = NULL; } /** run result Password encrypted successfully : length = 64 bytes. Value = 64726F777373617000E030312B9C252536C83F34F7EC3E47D554E9B188DD25E8 1BDAF9CB18F3ABE3693389BCDB1C224741A858E35954170115E82FC16C530200 Verifying encryption result... Decrypt result = password Sucess. 请按任意键继续. . . */ system("pause"); return 0;}
        
       
      
     
    
   

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