using Org.BouncyCastle.Asn1.Pkcs;

using Org.BouncyCastle.Asn1.X509;

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.Xml;

namespace Sysock.Framework

{

    /// <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(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[].InnerText));

            BigInteger exp = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[].InnerText));

            BigInteger d = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[].InnerText));

            BigInteger p = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[].InnerText));

            BigInteger q = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[].InnerText));

            BigInteger dp = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[].InnerText));

            BigInteger dq = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[].InnerText));

            BigInteger qinv = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[].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(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[].InnerText));

            BigInteger p = new BigInteger(, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[].InnerText));

            RsaKeyParameters pub = new RsaKeyParameters(false, m, p);

            SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub);

            byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();

            return Convert.ToBase64String(serializedPublicBytes);

        }

    }

}