/// <summary>

/// ikmb@163.com

/// </summary>

public class MyRAS

    {

        /// <summary>

        /// RAS加密

        /// </summary>

        /// <param name="xmlPublicKey">公钥</param>

        /// <param name="EncryptString">明文</param>

        /// <returns>密文</returns>

        public static string RSAEncrypt(string xmlPublicKey, string EncryptString)

        {

            byte[] PlainTextBArray;

            byte[] CypherTextBArray;

            string Result=String.Empty;

            System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

            rsa.FromXmlString(xmlPublicKey);

            int t = (int)(Math.Ceiling((double)EncryptString.Length / (double)));

            //分割明文

            for (int i = ; i <= t-; i++)

            {

                PlainTextBArray = (new UnicodeEncoding()).GetBytes(EncryptString.Substring(i * , EncryptString.Length - (i * ) >  ?  : EncryptString.Length - (i * )));

                CypherTextBArray = rsa.Encrypt(PlainTextBArray, false);

                Result += Convert.ToBase64String(CypherTextBArray) + "ThisIsSplit";

            }

            return Result;

        }

        /// <summary>

        /// RAS解密

        /// </summary>

        /// <param name="xmlPrivateKey">私钥</param>

        /// <param name="DecryptString">密文</param>

        /// <returns>明文</returns>

        public static string RSADecrypt(string xmlPrivateKey, string DecryptString)

        {

            byte[] PlainTextBArray;

            byte[] DypherTextBArray;

            string Result=String.Empty;

            System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

            rsa.FromXmlString(xmlPrivateKey);

            string[] Split = new string[];

            Split[] = "ThisIsSplit";

            //分割密文

            string[] mis = DecryptString.Split(Split, StringSplitOptions.RemoveEmptyEntries);

            for (int i = ; i < mis.Length; i++)

            {

                PlainTextBArray = Convert.FromBase64String(mis[i]);

                DypherTextBArray = rsa.Decrypt(PlainTextBArray, false);

                Result += (new UnicodeEncoding()).GetString(DypherTextBArray);

            }

            return Result;

        }

        /// <summary>

        /// 产生公钥和私钥对

        /// </summary>

        /// <returns>string[] 0:私钥;1:公钥</returns>

        public static string[] RSAKey()

        {

            string[] keys = new string[];

            System.Security.Cryptography.RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

            keys[] = rsa.ToXmlString(true);

            keys[] = rsa.ToXmlString(false);

            return keys;

        }

    }