在实际开发过程中碰到了一个需要由JAVA加解密而用VC解密阅读的需求。因为算法也无需太复杂，故选择使用DES算法，这个两者都支持的算法。整个加解密的过程与功能很简单。但查阅相关的资料与调试花费了不少时间，下面贴出两段代码样例与大家共享：
JAVA代码：
public class DesSecurity { BASE64Encoder encoder; BASE64Decoder decoder; Cipher enCipher; Cipher deCipher; /** * @param key 加密密钥 * @param iv 初始化向量 * @throws Exception */ public DesSecurity(String key, String iv) throws Exception { if (key == null) { throw new NullPointerException("Parameter is null!"); } initCipher(key.getBytes(), iv.getBytes()); } private void initCipher(byte[] secKey, byte[] secIv) throws Exception { // 创建MD5散列对象 MessageDigest md = MessageDigest.getInstance("MD5"); // 散列密钥 md.update(secKey); // 获得DES密钥 DESKeySpec dks = new DESKeySpec(md.digest()); // 获得DES加密密钥工厂 SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES"); // 生成加密密钥 SecretKey key = keyFactory.generateSecret(dks); // 创建初始化向量对象 IvParameterSpec iv = new IvParameterSpec(secIv); AlgorithmParameterSpec paramSpec = iv; // 为加密算法指定填充方式，创建加密会话对象 enCipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); // 为加密算法指定填充方式，创建解密会话对象 deCipher = Cipher.getInstance("DES/CBC/PKCS5Padding"); // 初始化加解密会话对象 enCipher.init(Cipher.ENCRYPT_MODE, key, paramSpec); deCipher.init(Cipher.DECRYPT_MODE, key, paramSpec); encoder = new BASE64Encoder(); decoder = new BASE64Decoder(); }/** * 加密数据 * @param data 待加密二进制数据 * @return 经BASE64编码过的加密数据 * @throws Exception */ public String encrypt(byte[] data) throws Exception { return encoder.encode(enCipher.doFinal(data)); }/*** 解密数据 * @param data 待解密字符串（经过BASE64编码） * @return 解密后的二进制数据 * @throws Exception */ public byte[] decrypt(String data) throws Exception { return deCipher.doFinal(decoder.decodeBuffer(data)); }} VC代码：// 参数: // [IN] lpszKey 加密密钥// [IN] lpszIv 初始化向量DesSecurity::DesSecurity(LPTSTR lpszKey, LPTSTR lpszIv){ if (lpszKey == NULL || lpszIv == NULL) { throw "Parameter is null!"; } m_hKey = NULL; init(lpszKey, lpszIv);} DesSecurity::~DesSecurity(void){ // Destroy the session key. if(m_hKey != 0) CryptDestroyKey(m_hKey); } void DesSecurity::init(LPTSTR lpszKey, LPTSTR lpszIv) { HCRYPTPROV hProv; HCRYPTHASH hHash; TCHAR szDebug[256]; DWORD dwLength; try { // 获得密钥容器 if(!CryptAcquireContext(&hProv, NULL, MS_ENHANCED_PROV, PROV_RSA_FULL, 0)) { sprintf(szDebug, "Error %x during CryptAcquireContext!/n", GetLastError()); throw szDebug; } // 创建MD5散列对象 if(!CryptCreateHash(hProv, CALG_MD5, 0, 0, &hHash)) { sprintf(szDebug, "Error %x during CryptCreateHash!/n", GetLastError()); throw szDebug; } // 散列密钥 dwLength = strlen(lpszKey); if(!CryptHashData(hHash, (LPBYTE)lpszKey, dwLength, 0)) { sprintf(szDebug, "Error %x during CryptHashData!/n", GetLastError()); throw szDebug; } // 创建会话密钥 if(!CryptDeriveKey(hProv, CALG_DES, hHash, 0, &m_hKey)) { sprintf(szDebug, "Error %x during CryptDeriveKey!/n", GetLastError()); throw szDebug; } // 设置初始化向量. if(!CryptSetKeyParam(m_hKey, KP_IV, (LPBYTE)lpszIv, 0)) { sprintf(szDebug, "Error %x during CryptSetKeyParam!/n", GetLastError()); throw szDebug; } } catch(LPTSTR lpszDebug) { // Destroy the hash object. if(hHash != 0) CryptDestroyHash(hHash); // Release the provider handle. if(hProv != 0) CryptReleaseContext(hProv, 0); throw lpszDebug; } }// // 功能: 解密数据// 参数: // [IN] lpszSrc 待解密数据(BASE64编码)// [IN/OUT] lpszDst 存放解密后数据的缓冲区// [IN/OUT] pnLen 输入时指缓冲区的长度，输出时指解密后数据的长度// 返回值:// TRUE 解密成功// FALSE 解密失败//BOOL DesSecurity::Decode(LPTSTR lpszSrc, LPBYTE lpszDst, PINT pnLen) { if (lpszSrc == NULL || lpszDst == NULL || pnLen == NULL) { SetLastErrorEx(ERROR_INVALID_PARAMETER ,SLE_ERROR); return false; } if (!Base64Decode(lpszSrc, _tcslen(lpszSrc), lpszDst, pnLen)) return false; if (!CryptDecrypt(m_hKey, 0, true, 0, lpszDst, (DWORD*)pnLen)) return false; return true;}