ASP.NET中RSA算法解密问题

Question

在ASP.NET中使用RSA算法进行加密，解密的时候出错，请问是什么情况？代码和错误如下：
string seckey;
        string pubkey;
        RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
        seckey = rsa.ToXmlString(true);
        pubkey = rsa.ToXmlString(false);        byte[] source = (new UnicodeEncoding()).GetBytes(txtInput.Text);
        byte[] bytes_Cypher_Text = rsa.Encrypt(source, false);
        string str_Cypher_Text = Convert.ToBase64String(bytes_Cypher_Text);
        txtOutput1.Text = str_Cypher_Text;        RSACryptoServiceProvider rsa1 = new RSACryptoServiceProvider();
        rsa1.FromXmlString(pubkey);        //byte[] DataToDecrypt = Convert.FromBase64String(txtOutput1.Text);
        byte[] bytes_Plain_Text = rsa1.Decrypt(bytes_Cypher_Text, false);
        UnicodeEncoding ByteConverter = new UnicodeEncoding();
        txtOutput2.Text = ByteConverter.GetString(bytes_Plain_Text);
异常详细信息: System.Security.Cryptography.CryptographicException: 不正确的项。
源错误: 
行 90: 
行 91:         //byte[] DataToDecrypt = Convert.FromBase64String(txtOutput1.Text);
行 92:         byte[] bytes_Plain_Text = rsa1.Decrypt(bytes_Cypher_Text, false);
行 93:         UnicodeEncoding ByteConverter = new UnicodeEncoding();
行 94:         txtOutput2.Text = ByteConverter.GetString(bytes_Plain_Text);
 

Answer 1

using System; using System.IO; using System.Text; using System.Security.Cryptography; namespace RX.SynchHistoryData.Utility {     /// <summary>     /// 根据对称算法对数据进行加密和解密     /// </summary>     public class CryptClass     {         private string txtKey = "lycompsofts=";         private string txtIV = "lycompsofts=";         private SymmetricAlgorithm mCSP;         public CryptClass()         {         }         private void keyIv()         {             mCSP = new DESCryptoServiceProvider();             mCSP.Key = Convert.FromBase64String(txtKey);             mCSP.IV = Convert.FromBase64String(txtIV);         }         /// <summary>         /// 加密         /// </summary>         /// <param name="str">待加密数据 </param>         /// <param name="sKey">密钥 </param>         /// <param name="sIV">初始化向量 </param>         /// <returns> </returns>         public string EncryptString(string str, string sKey, string sIV)         {             txtKey = sKey;             txtIV = sIV;             keyIv();             ICryptoTransform ct;             MemoryStream ms;             CryptoStream cs;             byte[] byt;             ct = mCSP.CreateEncryptor(mCSP.Key, mCSP.IV);             byt = Encoding.UTF8.GetBytes(str);             ms = new MemoryStream();             cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);             cs.Write(byt, 0, byt.Length);             cs.FlushFinalBlock();             cs.Close();             return Convert.ToBase64String(ms.ToArray());         }         /// <summary>         /// 解密         /// </summary>         /// <param name="str">已加密数据 </param>         /// <param name="sKey">密钥 </param>         /// <param name="sIV">初始化向量 </param>         /// <returns> </returns>         public string DecryptString(string str, string sKey, string sIV)         {             txtKey = sKey;             txtIV = sIV;             keyIv();             ICryptoTransform ct;             MemoryStream ms;             CryptoStream cs;             byte[] byt;             ct = mCSP.CreateDecryptor(mCSP.Key, mCSP.IV);             byt = Convert.FromBase64String(str);             ms = new MemoryStream();             cs = new CryptoStream(ms, ct, CryptoStreamMode.Write);             cs.Write(byt, 0, byt.Length);             cs.FlushFinalBlock();             cs.Close();             return Encoding.UTF8.GetString(ms.ToArray());         }     } } 
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