using System;

using System.Runtime.InteropServices;
using System.Collections;
using System.Text;

namespace sanpack_rsa_csclass
{
	public class Sanpack_rsa 
	{

		public static string s1;
		public static string s2;
		public static System.Collections.ArrayList charlist=new ArrayList();
		public static System.Collections.ArrayList hextxtlist=new ArrayList();
		public static System.Collections.ArrayList result_hexstrings=new ArrayList();
		public static uint RSAstep;
		public static uint RSAprimeplen1;
		public static uint RSAprimeplen2;

		[DllImport("sanpack_rsa.dll")]
		public static extern string get_Version();
		[DllImport("sanpack_rsa.dll")]
		public static extern int refresh_RSA_san(string a,string b);
		[DllImport("sanpack_rsa.dll")]
		public static extern int start_RSA_san();
		[DllImport("sanpack_rsa.dll")]
		public static extern int finish_RSA_san();
		[DllImport("sanpack_rsa.dll")]
		public static extern int RSA_san_en(byte []b,uint n);
		[DllImport("sanpack_rsa.dll")]
		public static extern int RSA_san_en_byte(byte b);
		[DllImport("sanpack_rsa.dll")]
		public static extern int RSA_san_dn(byte []b,uint n);
		[DllImport("sanpack_rsa.dll")]
		public static extern int RSA_san_en_hexstring(string s);
		[DllImport("sanpack_rsa.dll")]
		public static extern int RSA_san_dn_hexstring(string s);
		[DllImport("sanpack_rsa.dll")]
		public static extern string get_p();
		[DllImport("sanpack_rsa.dll")]
		public static extern string get_q();
		[DllImport("sanpack_rsa.dll")]
		public static extern string get_n();
		[DllImport("sanpack_rsa.dll")]
		public static extern string get_e();
		[DllImport("sanpack_rsa.dll")]
		public static extern string get_d();
		[DllImport("sanpack_rsa.dll")]
		public static extern string get_result_string();
		[DllImport("sanpack_rsa.dll")]
		public static extern byte get_result_byte(uint i);
		[DllImport("sanpack_rsa.dll")]
		public static extern string get_result_hexstring();
		[DllImport("sanpack_rsa.dll")]
		public static extern string string2hexstring(string s);
		[DllImport("sanpack_rsa.dll")]
		public static extern int set_e_fromhexstring(string s);
		[DllImport("sanpack_rsa.dll")]
		public static extern int force_e(string s,uint l);
		[DllImport("sanpack_rsa.dll")]
		public static extern int force_d(string s,uint l);
		[DllImport("sanpack_rsa.dll")]
		public static extern int force_n(string s,uint l);

		public static int GetRandomString()
		{
			Random rnd = new Random();
			Byte[] b = new Byte[System.Math.Max(RSAprimeplen1,RSAprimeplen2)];
			s1="";
			s2="";

			//next we'll produce 2 random string 
			//the string may have zero_code chars in it
			//to prevent from cutting the string
			//we change 00 into 41 in s1
			//          00 into 42 in s2
			//this work has been done in class RSA_san (sanpack_rsa.dll)

			//while(s1.Length<35)
			//{
			for(int i=0;i<RSAprimeplen1;i++)
			{
				Byte tmp=System.Convert.ToByte(254.0*rnd.NextDouble());
				if(tmp!=0)b[i]=tmp;else b[i]=1; //prevent zero_code chars here, but i dont know why it still appear@@
			}
			s1=Sanpack_rsa.FromASCIIByteArray(b);
			//}
			//while(s2.Length<35)
			//{
			for(int i=0;i<RSAprimeplen2;i++)
			{
				Byte tmp=System.Convert.ToByte(254.0*rnd.NextDouble());
				if(tmp!=0)b[i]=tmp;else b[i]=1;
			}
			s2=Sanpack_rsa.FromASCIIByteArray(b);
			//}
			return 1;
		}
		public static string FromASCIIByteArray(byte[] characters)
		{
			ASCIIEncoding encoding = new ASCIIEncoding( );
			string constructedString = encoding.GetString(characters);
			return (constructedString);
		}

		public static string FromUnicodeByteArray(byte[] characters)
		{
			UnicodeEncoding encoding = new UnicodeEncoding( );
			string constructedString = encoding.GetString(characters);
			return (constructedString);
		}

	}
}