基于RSA的加密/解密示例C#代码2021-07-12 10:55:45 /**//* * 基于RSA的加密/解密示例C#代码 * (采用字符串作为参数)RSA_Demo2 * * 夏春涛 Email:xChuntao@163.com * Blog:http://bluesky521.cnblogs.com * 运行环境：.net2.0 framework * * 备注： * 不对称算法通常用于加密少量数据，如加密对称密钥和 IV。通常， * 执行不对称加密的个人使用由另一方生成的公钥。.NET Framework * 为此目的而提供了 RSACryptoServiceProvider 类。 */using System;using System.Security.Cryptography;using System.Text;class RSACSPSample{ static void Main() { try { string str_Plain_Text = "How are you?How are you?How are you?How are you?=-popopolA"; Console.WriteLine("明文：" + str_Plain_Text); Console.WriteLine("长度：" + str_Plain_Text.Length.ToString()); Console.WriteLine(); RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); string str_Public_Key; string str_Private_Key; string str_Cypher_Text = RSA_Encrypt(str_Plain_Text, out str_Public_Key,out str_Private_Key); Console.WriteLine("密文：" + str_Cypher_Text); Console.WriteLine("公钥：" + str_Public_Key); Console.WriteLine("私钥：" + str_Private_Key); string str_Plain_Text2 = RSA_Decrypt(str_Cypher_Text, str_Private_Key); Console.WriteLine("解密：" + str_Plain_Text2); Console.WriteLine(); } catch (ArgumentNullException) { Console.WriteLine("Encryption failed."); } } //RSA加密,随机生成公私钥对并作为出参返回 static public string RSA_Encrypt(string str_Plain_Text, out string str_Public_Key, out string str_Private_Key) { str_Public_Key = ""; str_Private_Key = ""; UnicodeEncoding ByteConverter = new UnicodeEncoding(); byte[] DataToEncrypt = ByteConverter.GetBytes(str_Plain_Text); try { RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); str_Public_Key = Convert.ToBase64String(RSA.ExportCspBlob(false)); str_Private_Key = Convert.ToBase64String(RSA.ExportCspBlob(true)); //OAEP padding is only available on Microsoft Windows XP or later. byte[] bytes_Cypher_Text = RSA.Encrypt(DataToEncrypt, false); str_Public_Key = Convert.ToBase64String(RSA.ExportCspBlob(false)); str_Private_Key = Convert.ToBase64String(RSA.ExportCspBlob(true)); string str_Cypher_Text = Convert.ToBase64String(bytes_Cypher_Text); return str_Cypher_Text; } catch (CryptographicException e) { Console.WriteLine(e.Message); return null; } } //RSA解密 static public string RSA_Decrypt(string str_Cypher_Text, string str_Private_Key) { byte[] DataToDecrypt = Convert.FromBase64String(str_Cypher_Text); try { RSACryptoServiceProvider RSA = new RSACryptoServiceProvider(); //RSA.ImportParameters(RSAKeyInfo); byte[] bytes_Public_Key = Convert.FromBase64String(str_Private_Key); RSA.ImportCspBlob(bytes_Public_Key); //OAEP padding is only available on Microsoft Windows XP or later. byte[] bytes_Plain_Text = RSA.Decrypt(DataToDecrypt, false); UnicodeEncoding ByteConverter = new UnicodeEncoding(); string str_Plain_Text = ByteConverter.GetString(bytes_Plain_Text); return str_Plain_Text; } catch (CryptographicException e) { Console.WriteLine(e.ToString()); return null; } }} 备注:经测试明文长度超过58时会出现异常. 源码附件:/Files/bluesky521/RSA_Demo.rar上一篇：重载操作符[]下一篇：java中栈Stack类操作