关于RSA 加解密 java生成秘钥对 传给 C#进行加密，c#生成的密文如何转换格式能在JAVA上用私钥解密

关于RSA 加解密 java生成秘钥对 传给 C#进行加密，c#生成的密文怎么转换格式能在JAVA上用私钥解密
 java生成秘钥对  经过转换格式后传给 C#进行加密，C#生成的密文怎么转换格式能在JAVA上用私钥解密
tes是在C#生成的密文经过BASE64转码存到.txt文件，然后再JAVA中读出来


                 Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
BASE64Decoder decoder = new BASE64Decoder();
byte[] b1 = decoder.decodeBuffer(tes);
                 /** 执行解密操作 */
byte[] b = cipher.doFinal(b1);←这行代码解析出错，网上查原因是因为C#加密后得到的格式不正确

求大神解答
------解决思路----------------------
c# 本身就可以算出来。或者c#调用js也可以算出来。
------解决思路----------------------
首先RSA加密算法是统一的，和在JAVA中实现和C#实现无关。你生成的秘钥需要为C#去提供，在这个环节中加密的行为应该是统一的，只是在转化Base64的过程中出现问题就需要你跟踪下在JAVA中和C#中对加密后的byte数组的二次编码行为是否出现不同了。
------解决思路----------------------
对称加密嘛。在密钥没错的情况下无非就是编码问题了
------解决思路----------------------
http://www.codeproject.com/Articles/6623/Porting-Java-Public-Key-Hash-to-C-NET
------解决思路----------------------
http://www.cnblogs.com/datous/p/RSAKeyConvert.html#

格式转换要用到一个开源加密库Bouncy Castle Crypto APIs，官网地址： http://www.bouncycastle.org/csharp/

/// <summary>

/// RSA密钥格式转换

/// </summary>

public class RSAKeyConvert

{

    /// <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);

    }

}