/// <summary>    /// c# 使用 java 的公鑰進行rsa加密 utf8編碼  通過解析公鑰加密數據    /// </summary>    /// <param name="publickey"></param>    /// <returns></returns>    public static string RSAEncrypts(string content)    {      RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();      byte[] cipherbytes;      X509Certificate2 x509Certificate2 = new X509Certificate2("D://Config//dsptest.cer");      //創建并返回當前算法對象的xml字符串表示形式      string publicKeyString = x509Certificate2.PublicKey.Key.ToXmlString(false);      rsa.FromXmlString(publicKeyString);      //rsa.FromXmlString(RSAPublicKeyJava2DotNet(publicKeyString));      cipherbytes = rsa.Encrypt(Encoding.UTF8.GetBytes(content), false);      return Convert.ToBase64String(cipherbytes);      }      /// <summary>      /// 私鑰解密 通過解析私鑰來解析數據 X509KeyStorageFlags.Exportable這個屬性很關鍵是獲取私鑰信息的      /// </summary>      /// <param name="privatekey"></param>      /// <param name="content"></param>      /// <returns></returns>     public static string RSADecrypt( string content)    {      byte[] rgb = Convert.FromBase64String(content);      RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();      byte[] cipherbytes;      X509Certificate2 x509Certificate2 = new X509Certificate2("D://Config//test.pfx", "cfca1234", X509KeyStorageFlags.Exportable);      //創建并返回當前算法對象的xml字符串表示形式      //rsa.FromXmlString(RSAPrivateKeyJava2DotNet(Const.privatekey));      rsa.FromXmlString(x509Certificate2.PrivateKey.ToXmlString(true));      cipherbytes = rsa.Decrypt(Convert.FromBase64String(content), false);      return Encoding.UTF8.GetString(cipherbytes);          }

/***************以下是java提供的公私鑰轉成.net公私鑰XML的方式*************************************//// <summary> /// RSA公鑰格式轉換，java->.net/// </summary>/// <param name="publicKey">java生成的公鑰</param>/// <returns></returns>public static string RSAPublicKeyJava2DotNet(string publicKey){RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));}/// <summary>/// RSA私鑰格式轉換，java->.net/// </summary>/// <param name="privateKey">java生成的RSA私鑰</param>/// <returns></returns>public static string RSAPrivateKeyJava2DotNet(string privateKey){ RsaPrivateCrtKeyParameters privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));}