using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Security;
using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
using System.Xml;
using System.Xml.Serialization;

   public static string AesEncrypt(string content, string key)
        {
            byte[] keyArray = Convert.FromBase64String(key);
            byte[] toEncryptArray = Encoding.UTF8.GetBytes(content);

            SymmetricAlgorithm des = Aes.Create();
            des.Key = keyArray;
            des.Mode = CipherMode.ECB;
            des.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = des.CreateEncryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return Convert.ToBase64String(resultArray);
        }

 public static string AesDecrypt(string content, string key)
        {
            byte[] keyArray = Convert.FromBase64String(key);
            byte[] toEncryptArray = Convert.FromBase64String(content);

            SymmetricAlgorithm des = Aes.Create();
            des.Key = keyArray;
            des.Mode = CipherMode.ECB;
            des.Padding = PaddingMode.PKCS7;

            ICryptoTransform cTransform = des.CreateDecryptor();
            byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);

            return Convert.ToBase64String(resultArray);
        }

 /// <summary>
        /// RSA簽名
        /// </summary>
        /// <param name="content">數據</param>
        /// <param name="privateKey">RSA密鑰</param>
        /// <returns></returns>
        public static string RasSign(string content, string privateKey)
        {
            var signer = SignerUtilities.GetSigner("SHA1withRSA");
　　　　　　　 //將java格式的rsa密鑰轉換成.net格式
            var privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));
            signer.Init(true, privateKeyParam);
            var plainBytes = Encoding.UTF8.GetBytes(content);
            signer.BlockUpdate(plainBytes, 0, plainBytes.Length);
            var signBytes = signer.GenerateSignature();
            return Convert.ToBase64String(signBytes);
        }

 /// <summary>
        /// RSA驗簽
        /// </summary>
        /// <param name="content">內容</param>
        /// <param name="publicKey">RSA公鑰</param>
        /// <param name="signData">簽名字段</param>
        /// <returns></returns>
        public static bool VerifySign(string content, string publicKey, string signData)
        {
            var signer = SignerUtilities.GetSigner("SHA1withRSA");
            var publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
            signer.Init(false, publicKeyParam);
            var signBytes = Convert.FromBase64String(signData);
            var plainBytes = Encoding.UTF8.GetBytes(content);
            signer.BlockUpdate(plainBytes, 0, plainBytes.Length);
            var ret = signer.VerifySignature(signBytes);
            return ret;
        }

 public static string RasSign(string content, string privateKey)
        {
            var pkey = RSAPrivateKeyJava2DotNet(privateKey);
            string halg = "SHA1";//SHA1 MD5 SHA256  
            var  signData = RSAHelper.SignData(pkey, content, halg);//SHA1  
            return signData;
        }

        /// <summary>      
        /// RSA私鑰格式轉換，java->.net      
        /// </summary>      
        /// <param name="privateKey">java生成的RSA私鑰</param>      
        /// <returns></returns>     
        private static string RSAPrivateKeyJava2DotNet(this 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()));
        }