/// <summary> /// 加密要发送的数据,包含签名,AES加密,RSA加密AES密钥等步骤 /// </summary> /// <param name="data">要加密的正文明文数据</param> /// <returns>已加密待发送的密文</returns> public string EncryptData(string data) { data.CheckNotNull("data"); //获取正文摘要 string signData = RsaHelper.SignData(data, _ownPrivateKey); data = new[] { data, signData }.ExpandAndToString(Separator); //使用AES加密 正文+摘要 AesHelper aes = new AesHelper(true); data = aes.Encrypt(data); //RSA加密AES密钥 byte[] keyBytes = aes.Key.ToBytes(); string enDesKey = Convert.ToBase64String(RsaHelper.Encrypt(keyBytes, _facePublicKey)); return(new[] { enDesKey, data }.ExpandAndToString(Separator)); }
/// <summary> /// 解密接收到的加密数据并验证完整性,如果验证通过返回明文 /// </summary> /// <param name="data">接收到的加密数据</param> /// <returns>解密并验证成功后,返回明文</returns> public string DecryptAndVerifyData(string data) { data.CheckNotNullOrEmpty("data"); string[] separators = { Separator }; //0为AES密钥密文,1为 正文+摘要 的密文 string[] datas = data.Split(separators, StringSplitOptions.None); //用接收端私钥RSA解密获取AES密钥 byte[] keyBytes = RsaHelper.Decrypt(Convert.FromBase64String(datas[0]), _ownPrivateKey); string key = keyBytes.ToString2(); //AES解密获取 正文+摘要 的明文 data = new AesHelper(key, true).Decrypt(datas[1]); //0为正文明文,1为摘要 datas = data.Split(separators, StringSplitOptions.None); data = datas[0]; if (RsaHelper.VerifyData(data, datas[1], _facePublicKey)) { return(data); } throw new CryptographicException("加密数据在进行解密时校验失败"); }