C#RSA的研究，C#、Java互通

不加解释，自己研究

using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Encodings;
using Org.BouncyCastle.Crypto.Engines;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.X509;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Xml;

namespace HealthHappy.PlatformInterface.Cytj
{
    public sealed class RSAHelper
    {
        #region RSA 加密解密

        #region RSA 的密钥产生
        /// <summary>
        /// RSA产生密钥
        /// </summary>
        /// <param name="xmlKeys">私钥</param>
        /// <param name="xmlPublicKey">公钥</param>
        static public void RSAKey(out string xmlKeys, out string xmlPublicKey)
        {
            try
            {
                System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
                xmlKeys = rsa.ToXmlString(true);
                xmlPublicKey = rsa.ToXmlString(false);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion




        #region  加密  
        /// <summary>  
        /// RSA加密  
        /// </summary>  
        /// <param name="publicKeyJava"></param>  
        /// <param name="data"></param>  
        /// <returns></returns>  
        public static string EncryptJava(string publicKeyJava, string data, string encoding = "UTF-8")
        {
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            //byte[] cipherbytes;
            //rsa.FromPublicKeyJavaString(publicKeyJava);
            rsa.FromXmlString(publicKeyJava);

            //☆☆☆☆.NET 4.6以后特有☆☆☆☆  
            //HashAlgorithmName hashName = new System.Security.Cryptography.HashAlgorithmName(hashAlgorithm);  
            //RSAEncryptionPadding padding = RSAEncryptionPadding.OaepSHA512;//RSAEncryptionPadding.CreateOaep(hashName);//.NET 4.6以后特有                 
            //cipherbytes = rsa.Encrypt(Encoding.GetEncoding(encoding).GetBytes(data), padding);  
            //☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆  

            //☆☆☆☆.NET 4.6以前请用此段代码☆☆☆☆  
            //cipherbytes = rsa.Encrypt(Encoding.GetEncoding(encoding).GetBytes(data), false);

            using (var rsaProvider = new RSACryptoServiceProvider())
            {
                var inputBytes = Encoding.UTF8.GetBytes(data);//有含义的字符串转化为字节流                              
                int bufferSize = (rsa.KeySize / 8) - 11;//单块最大长度
                var buffer = new byte[bufferSize];
                using (MemoryStream inputStream = new MemoryStream(inputBytes),
                     outputStream = new MemoryStream())
                {
                    while (true)
                    { //分段加密
                        int readSize = inputStream.Read(buffer, 0, bufferSize);
                        if (readSize <= 0)
                        {
                            break;
                        }

                        var temp = new byte[readSize];
                        Array.Copy(buffer, 0, temp, 0, readSize);
                        var encryptedBytes = rsaProvider.Encrypt(temp, false);
                        outputStream.Write(encryptedBytes, 0, encryptedBytes.Length);
                    }
                    return Convert.ToBase64String(outputStream.ToArray());//转化为字节流方便传输
                }
            }
        }
        /// <summary>  
        /// RSA加密  
        /// </summary>  
        /// <param name="publicKeyCSharp"></param>  
        /// <param name="data"></param>  
        /// <returns></returns>  
        public static string EncryptCSharp(string publicKeyCSharp, string data, string encoding = "UTF-8")
        {
            RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKeyCSharp));
            SubjectPublicKeyInfo subjectPublicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(publicKeyParam);
            Asn1Object asn1ObjectPublic = subjectPublicKeyInfo.ToAsn1Object();
            byte[] publicInfoByte = asn1ObjectPublic.GetEncoded();


            Asn1Object pubKeyObj = Asn1Object.FromByteArray(publicInfoByte);//这里也可以从流中读取，从本地导入
            AsymmetricKeyParameter pubKey = PublicKeyFactory.CreateKey(SubjectPublicKeyInfo.GetInstance(pubKeyObj));
            IAsymmetricBlockCipher cipher = new Pkcs1Encoding(new RsaEngine());
            cipher.Init(true, pubKey);//true表示加密


            //byte[] encryptData = cipher.ProcessBlock(Encoding.UTF8.GetBytes(data1), 0, Encoding.UTF8.GetBytes(data).Length);
            byte[] encryptData = null;
            //加密  
            try
            {

                byte[] byteData = System.Text.Encoding.UTF8.GetBytes(data);

                int inputLen = byteData.Length;
                MemoryStream ms = new MemoryStream();
                int offSet = 0;
                byte[] cache;
                int i = 0;
                // 对数据分段加密
                while (inputLen - offSet > 0)
                {
                    if (inputLen - offSet > 117)
                    {
                        cache = cipher.ProcessBlock(byteData, offSet, 117);
                    }
                    else
                    {
                        cache = cipher.ProcessBlock(byteData, offSet, inputLen - offSet);
                    }
                    ms.Write(cache, 0, cache.Length);
                    i++;
                    offSet = i * 117;
                }
                encryptData = ms.ToArray();

                ms.Close();
                ms.Dispose();
                //var ResultData = engine.ProcessBlock(byteData, 0, byteData.Length);
                //string testData = Convert.ToBase64String(encryptedData);
                //Console.WriteLine("密文（base64编码）:" + Convert.ToBase64String(encryptedData) + Environment.NewLine);
            }
            catch (Exception ex)
            {
                //return ex.Message;
                Console.WriteLine("密文（base64编码）:" + Convert.ToBase64String(encryptData) + Environment.NewLine);
            }

            return Convert.ToBase64String(encryptData); ;
            RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
            byte[] cipherbytes;
            rsa.FromXmlString(publicKeyCSharp);

            //☆☆☆☆.NET 4.6以后特有☆☆☆☆  
            //HashAlgorithmName hashName = new System.Security.Cryptography.HashAlgorithmName(hashAlgorithm);  
            //RSAEncryptionPadding padding = RSAEncryptionPadding.OaepSHA512;//RSAEncryptionPadding.CreateOaep(hashName);//.NET 4.6以后特有                 
            //cipherbytes = rsa.Encrypt(Encoding.GetEncoding(encoding).GetBytes(data), padding);  
            //☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆☆  

            //☆☆☆☆.NET 4.6以前请用此段代码☆☆☆☆  
            cipherbytes = rsa.Encrypt(Encoding.GetEncoding(encoding).GetBytes(data), false);

            return Convert.ToBase64String(cipherbytes);
        }

        #endregion





        #region RSA加密函数
        //############################################################################## 
        //RSA 方式加密 
        //KEY必须是XML的形式,返回的是字符串 
        //该加密方式有长度限制的！
        //##############################################################################

        /// <summary>
        /// RSA的加密函数
        /// </summary>
        /// <param name="xmlPublicKey">公钥</param>
        /// <param name="encryptString">待加密的字符串</param>
        /// <returns></returns>
        static public string RSAEncrypt(string xmlPublicKey, string encryptString)
        {
            try
            {
                byte[] PlainTextBArray;
                byte[] CypherTextBArray;
                string Result;
                System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
                rsa.FromXmlString(xmlPublicKey);
                PlainTextBArray = (new UTF8Encoding()).GetBytes(encryptString);
                CypherTextBArray = rsa.Encrypt(PlainTextBArray, false);
                Result = Convert.ToBase64String(CypherTextBArray);
                return Result;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// RSA的加密函数 
        /// </summary>
        /// <param name="xmlPublicKey">公钥</param>
        /// <param name="EncryptString">待加密的字节数组</param>
        /// <returns></returns>
        static public string RSAEncrypt(string xmlPublicKey, byte[] EncryptString)
        {
            try
            {
                byte[] CypherTextBArray;
                string Result;
                System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
                rsa.FromXmlString(xmlPublicKey);
                CypherTextBArray = rsa.Encrypt(EncryptString, false);
                Result = Convert.ToBase64String(CypherTextBArray);
                return Result;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region RSA解密函数 
        /// <summary>
        /// RSA的解密函数
        /// </summary>
        /// <param name="xmlPrivateKey">私钥</param>
        /// <param name="decryptString">待解密的字符串</param>
        /// <returns></returns>
        static public string RSADecrypt(string xmlPrivateKey, string decryptString)
        {
            try
            {
                byte[] PlainTextBArray;
                byte[] DypherTextBArray;
                string Result;
                System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
                rsa.FromXmlString(xmlPrivateKey);
                PlainTextBArray = Convert.FromBase64String(decryptString);
                DypherTextBArray = rsa.Decrypt(PlainTextBArray, false);
                Result = (new UTF8Encoding()).GetString(DypherTextBArray);
                return Result;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// RSA的解密函数 
        /// </summary>
        /// <param name="xmlPrivateKey">私钥</param>
        /// <param name="DecryptString">待解密的字节数组</param>
        /// <returns></returns>
        static public string RSADecrypt(string xmlPrivateKey, byte[] DecryptString)
        {
            try
            {
                byte[] DypherTextBArray;
                string Result;
                System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();
                rsa.FromXmlString(xmlPrivateKey);
                DypherTextBArray = rsa.Decrypt(DecryptString, false);
                Result = (new UnicodeEncoding()).GetString(DypherTextBArray);
                return Result;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion


        static public string EncryptRSA(string publickey, string plaintext)
        {
            //RSA的加解密过程： 
            // 有 rsa1 和 rsa2 两个RSA对象。 
            // 现在要 rsa2 发送一段信息给 rsa1， 则先由 rsa1 发送“公钥”给 rsa2 
            // rsa2 获取得公钥之后，用来加密要发送的数据内容。 
            // rsa1 获取加密后的内容后，用自己的私钥解密，得出原始的数据内容。

            RSACryptoServiceProvider rsa1 = new RSACryptoServiceProvider();
            RSACryptoServiceProvider rsa2 = new RSACryptoServiceProvider();

            publickey = rsa1.ToXmlString(false); //导出 rsa1 的公钥

            rsa2.FromXmlString(publickey); //rsa2 导入 rsa1 的公钥，用于加密信息

            //rsa2开始加密 
            byte[] cipherbytes;
            cipherbytes = rsa2.Encrypt(Encoding.UTF8.GetBytes(plaintext), false);

            string resut = string.Empty;
            for (int i = 0; i < cipherbytes.Length; i++)
            {
                resut += string.Format("{0:X2} ", cipherbytes[i]);
            }
            return resut;
        }

        public void DecryptRSA(string publickey, string plaintext)
        {
            ////RSA的加解密过程： 
            //// 有 rsa1 和 rsa2 两个RSA对象。 
            //// 现在要 rsa2 发送一段信息给 rsa1， 则先由 rsa1 发送“公钥”给 rsa2 
            //// rsa2 获取得公钥之后，用来加密要发送的数据内容。 
            //// rsa1 获取加密后的内容后，用自己的私钥解密，得出原始的数据内容。

            //RSACryptoServiceProvider rsa1 = new RSACryptoServiceProvider();
            //RSACryptoServiceProvider rsa2 = new RSACryptoServiceProvider();

            //publickey = rsa1.ToXmlString(false); //导出 rsa1 的公钥

            //rsa2.FromXmlString(publickey); //rsa2 导入 rsa1 的公钥，用于加密信息

            ////rsa2开始加密 
            //byte[] cipherbytes;
            //cipherbytes = rsa2.Encrypt(Encoding.UTF8.GetBytes(plaintext), false);

            //string resut = string.Empty;
            //for (int i = 0; i < cipherbytes.Length; i++)
            //{
            // resut += string.Format("{0:X2} ", cipherbytes[i]);
            //}
            //return resut;
            ////rsa1开始解密 
            //byte[] plaintbytes;
            //plaintbytes = rsa1.Decrypt(cipherbytes, false);

            //Console.WriteLine("解密后的数据是：");
            //Console.WriteLine(Encoding.UTF8.GetString(plaintbytes));

            //Console.ReadLine();
        }

        #endregion

        #region RSA 数字签名

        #region 获取Hash描述表 
        /// <summary>
        /// 获取Hash描述表
        /// </summary>
        /// <param name="strSource">待签名的字符串</param>
        /// <param name="HashData">Hash描述</param>
        /// <returns></returns>
        static public bool GetHash(string strSource, ref byte[] HashData)
        {
            try
            {
                byte[] Buffer;
                System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
                Buffer = System.Text.Encoding.GetEncoding("GB2312").GetBytes(strSource);
                HashData = MD5.ComputeHash(Buffer);
                return true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 获取Hash描述表
        /// </summary>
        /// <param name="strSource">待签名的字符串</param>
        /// <param name="strHashData">Hash描述</param>
        /// <returns></returns>
        static public bool GetHash(string strSource, ref string strHashData)
        {
            try
            {
                //从字符串中取得Hash描述 
                byte[] Buffer;
                byte[] HashData;
                System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
                Buffer = System.Text.Encoding.GetEncoding("GB2312").GetBytes(strSource);
                HashData = MD5.ComputeHash(Buffer);
                strHashData = Convert.ToBase64String(HashData);
                return true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 获取Hash描述表
        /// </summary>
        /// <param name="objFile">待签名的文件</param>
        /// <param name="HashData">Hash描述</param>
        /// <returns></returns>
        static public bool GetHash(System.IO.FileStream objFile, ref byte[] HashData)
        {
            try
            {
                //从文件中取得Hash描述 
                System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
                HashData = MD5.ComputeHash(objFile);
                objFile.Close();
                return true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 获取Hash描述表
        /// </summary>
        /// <param name="objFile">待签名的文件</param>
        /// <param name="strHashData">Hash描述</param>
        /// <returns></returns>
        static public bool GetHash(System.IO.FileStream objFile, ref string strHashData)
        {
            try
            {
                //从文件中取得Hash描述 
                byte[] HashData;
                System.Security.Cryptography.HashAlgorithm MD5 = System.Security.Cryptography.HashAlgorithm.Create("MD5");
                HashData = MD5.ComputeHash(objFile);
                objFile.Close();
                strHashData = Convert.ToBase64String(HashData);
                return true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region RSA签名
        /// <summary>
        /// RSA签名
        /// </summary>
        /// <param name="strKeyPrivate">私钥</param>
        /// <param name="HashbyteSignature">待签名Hash描述</param>
        /// <param name="EncryptedSignatureData">签名后的结果</param>
        /// <returns></returns>
        static public bool SignatureFormatter(string strKeyPrivate, byte[] HashbyteSignature, ref byte[] EncryptedSignatureData)
        {
            try
            {
                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

                RSA.FromXmlString(strKeyPrivate);
                System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
                //设置签名的算法为MD5 
                RSAFormatter.SetHashAlgorithm("MD5");
                //执行签名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
                return true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// RSA签名
        /// </summary>
        /// <param name="strKeyPrivate">私钥</param>
        /// <param name="HashbyteSignature">待签名Hash描述</param>
        /// <param name="m_strEncryptedSignatureData">签名后的结果</param>
        /// <returns></returns>
        static public bool SignatureFormatter(string strKeyPrivate, byte[] HashbyteSignature, ref string strEncryptedSignatureData)
        {
            try
            {
                byte[] EncryptedSignatureData;
                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
                RSA.FromXmlString(strKeyPrivate);
                System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
                //设置签名的算法为MD5 
                RSAFormatter.SetHashAlgorithm("MD5");
                //执行签名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
                strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);
                return true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// RSA签名
        /// </summary>
        /// <param name="strKeyPrivate">私钥</param>
        /// <param name="strHashbyteSignature">待签名Hash描述</param>
        /// <param name="EncryptedSignatureData">签名后的结果</param>
        /// <returns></returns>
        static public bool SignatureFormatter(string strKeyPrivate, string strHashbyteSignature, ref byte[] EncryptedSignatureData)
        {
            try
            {
                byte[] HashbyteSignature;

                HashbyteSignature = Convert.FromBase64String(strHashbyteSignature);
                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();

                RSA.FromXmlString(strKeyPrivate);
                System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
                //设置签名的算法为MD5 
                RSAFormatter.SetHashAlgorithm("MD5");
                //执行签名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);

                return true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// RSA签名
        /// </summary>
        /// <param name="strKeyPrivate">私钥</param>
        /// <param name="strHashbyteSignature">待签名Hash描述</param>
        /// <param name="strEncryptedSignatureData">签名后的结果</param>
        /// <returns></returns>
        static public bool SignatureFormatter(string strKeyPrivate, string strHashbyteSignature, ref string strEncryptedSignatureData)
        {
            try
            {
                byte[] HashbyteSignature;
                byte[] EncryptedSignatureData;
                HashbyteSignature = Convert.FromBase64String(strHashbyteSignature);
                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
                RSA.FromXmlString(strKeyPrivate);
                System.Security.Cryptography.RSAPKCS1SignatureFormatter RSAFormatter = new System.Security.Cryptography.RSAPKCS1SignatureFormatter(RSA);
                //设置签名的算法为MD5 
                RSAFormatter.SetHashAlgorithm("MD5");
                //执行签名 
                EncryptedSignatureData = RSAFormatter.CreateSignature(HashbyteSignature);
                strEncryptedSignatureData = Convert.ToBase64String(EncryptedSignatureData);
                return true;
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #region RSA 签名验证
        /// <summary>
        /// RSA签名验证
        /// </summary>
        /// <param name="strKeyPublic">公钥</param>
        /// <param name="HashbyteDeformatter">Hash描述</param>
        /// <param name="DeformatterData">签名后的结果</param>
        /// <returns></returns>
        static public bool SignatureDeformatter(string strKeyPublic, byte[] HashbyteDeformatter, byte[] DeformatterData)
        {
            try
            {
                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
                RSA.FromXmlString(strKeyPublic);
                System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
                //指定解密的时候HASH算法为MD5 
                RSADeformatter.SetHashAlgorithm("MD5");
                if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// RSA签名验证
        /// </summary>
        /// <param name="strKeyPublic">公钥</param>
        /// <param name="strHashbyteDeformatter">Hash描述</param>
        /// <param name="DeformatterData">签名后的结果</param>
        /// <returns></returns>
        static public bool SignatureDeformatter(string strKeyPublic, string strHashbyteDeformatter, byte[] DeformatterData)
        {
            try
            {
                byte[] HashbyteDeformatter;
                HashbyteDeformatter = Convert.FromBase64String(strHashbyteDeformatter);
                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
                RSA.FromXmlString(strKeyPublic);
                System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
                //指定解密的时候HASH算法为MD5 
                RSADeformatter.SetHashAlgorithm("MD5");
                if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// RSA签名验证
        /// </summary>
        /// <param name="strKeyPublic">公钥</param>
        /// <param name="HashbyteDeformatter">Hash描述</param>
        /// <param name="strDeformatterData">签名后的结果</param>
        /// <returns></returns>
        static public bool SignatureDeformatter(string strKeyPublic, byte[] HashbyteDeformatter, string strDeformatterData)
        {
            try
            {
                byte[] DeformatterData;
                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
                RSA.FromXmlString(strKeyPublic);
                System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
                //指定解密的时候HASH算法为MD5 
                RSADeformatter.SetHashAlgorithm("MD5");
                DeformatterData = Convert.FromBase64String(strDeformatterData);
                if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        /// <summary>
        /// RSA签名验证
        /// </summary>
        /// <param name="strKeyPublic">公钥</param>
        /// <param name="strHashbyteDeformatter">Hash描述</param>
        /// <param name="strDeformatterData">签名后的结果</param>
        /// <returns></returns>
        static public bool SignatureDeformatter(string strKeyPublic, string strHashbyteDeformatter, string strDeformatterData)
        {
            try
            {
                byte[] DeformatterData;
                byte[] HashbyteDeformatter;
                HashbyteDeformatter = Convert.FromBase64String(strHashbyteDeformatter);
                System.Security.Cryptography.RSACryptoServiceProvider RSA = new System.Security.Cryptography.RSACryptoServiceProvider();
                RSA.FromXmlString(strKeyPublic);
                System.Security.Cryptography.RSAPKCS1SignatureDeformatter RSADeformatter = new System.Security.Cryptography.RSAPKCS1SignatureDeformatter(RSA);
                //指定解密的时候HASH算法为MD5 
                RSADeformatter.SetHashAlgorithm("MD5");
                DeformatterData = Convert.FromBase64String(strDeformatterData);
                if (RSADeformatter.VerifySignature(HashbyteDeformatter, DeformatterData))
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        #endregion

        #endregion

        #region 公钥私钥DotNet和Java互转

        /// <summary> 
        /// RSA私钥格式转换，java->.net 
        /// </summary> 
        /// <param name="privateKey">java生成的RSA私钥</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()));
        }

        /// <summary> 
        /// RSA私钥格式转换，.net->java 
        /// </summary> 
        /// <param name="privateKey">.net生成的私钥</param> 
        /// <returns></returns> 
        public static string RSAPrivateKeyDotNet2Java(string privateKey)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(privateKey);
            BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
            BigInteger exp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
            BigInteger d = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[0].InnerText));
            BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[0].InnerText));
            BigInteger q = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[0].InnerText));
            BigInteger dp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[0].InnerText));
            BigInteger dq = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[0].InnerText));
            BigInteger qinv = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[0].InnerText));

            RsaPrivateCrtKeyParameters privateKeyParam = new RsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv);

            PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam);
            byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded();
            return Convert.ToBase64String(serializedPrivateBytes);
        }

        /// <summary> 
        /// RSA公钥格式转换，java->.net 
        /// </summary> 
        /// <param name="publicKey">java生成的公钥</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公钥格式转换，.net->java 
        /// </summary> 
        /// <param name="publicKey">.net生成的公钥</param> 
        /// <returns></returns> 
        public static string RSAPublicKeyDotNet2Java(string publicKey)
        {
            XmlDocument doc = new XmlDocument();
            doc.LoadXml(publicKey);
            BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
            BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
            RsaKeyParameters pub = new RsaKeyParameters(false, m, p);

            SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub);
            byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
            return Convert.ToBase64String(serializedPublicBytes);
        }
        #endregion
    }
}