Code changes, added base64 proj on c++

Signed-off-by: JDM170 <30170278+JDM170@users.noreply.github.com>
2025-12-10 05:57:19 +07:00 · 2020-09-28 22:39:59 +07:00
parent 9f9a3f1d7f
commit f50aca6691
12 changed files with 548 additions and 69 deletions
--- a/Program.cs
+++ b/Program.cs
@@ -8,17 +8,49 @@
 */
 using System;
 using System.IO;
+using System.Text;
+using System.Runtime.InteropServices;
+using System.Reflection;
 using Tea;
 using Utils;

+public class dllimport
+{	
+	Assembly asm = Assembly.LoadFrom(@".\base64.dll");
+	
+	//public string test(string str)
+	//{
+	//	return Base64Encode(Encoding.UTF8.GetBytes(str), 8);
+	//}
+}
 namespace ModelCoder
 {
 	class Program
 	{
-		private static readonly int encodeSize = 3000;
+		private static IUtil util;
+		private static ITeaCoding tea;
+		private static dllimport dlltest;
+		private static readonly uint blockSize = 12;
+		private static readonly uint blockNums = 3000;
+		private static readonly uint encodeSize = blockSize * blockNums;

+		private static string checkBlockBytes(byte block)
+		{
+			const int byteCount = 8;
+			string newBlock = block.ToString();
+			int size = Encoding.UTF8.GetByteCount(newBlock);
+			//Console.WriteLine("newBlock: " + newBlock);
+			//Console.WriteLine("newBlock size: " + size);
+			if (size < byteCount)
+				for (int i = 0; i < (byteCount - size); i++)
+					newBlock += '\0';
+			//Console.WriteLine("newblock size: " + System.Text.ASCIIEncoding.UTF8.GetByteCount(newBlock));
+			return newBlock;
+		}
+		
 		private static bool encodeFile(string path, uint[] key)
 		{
+			#region Reading file
 			Console.WriteLine("[OUTPUT] Reading: " + path);
 			byte[] file_bytes;
 			try {
@@ -27,16 +59,70 @@ namespace ModelCoder
 				Console.WriteLine("[OUTPUT] File '" + path + "' not found");
 				return false;
 			}
-
-			ITeaCoding tea = new TeaCoding();
-			var block = new uint[2];
-			for (uint i = 0; i < encodeSize; i += 2) {
-				Console.WriteLine(i + " start iteration");
-				block[0] = file_bytes[i];
-				block[1] = file_bytes[i + 1];
-				Console.WriteLine(i + " start encoding");
-				tea.code(block, key);
+			#endregion
+			
+			/*string[] test = {"22\0\0\0\0\0\0", "1\0\0\0\0\0\0\0"};
+			foreach (var i in test)
+			{
+				Console.WriteLine(i + " bytes: " + Encoding.UTF8.GetByteCount(i));
+				Console.WriteLine(i + " b64: " + util.Base64Encode(i));
 			}
+			string blockCheck = checkBlockBytes(file_bytes[0]);
+			Console.WriteLine("first file block: " + blockCheck);
+			Console.WriteLine("first file block size: " + Encoding.UTF8.GetByteCount(blockCheck));
+			blockCheck = util.Base64Encode(blockCheck);
+			Console.WriteLine("first file block b64e: " + blockCheck);
+			Console.WriteLine("first file block b64d: " + util.Base64Decode(blockCheck));*/
+
+			// TEA and Base64 encoding
+			var block = new uint[2];
+			string result = "";
+			for (uint i = 0; i < 10; i += 2)
+			{
+				block[0] = Convert.ToUInt32(checkBlockBytes(file_bytes[i]));
+				block[1] = Convert.ToUInt32(checkBlockBytes(file_bytes[i + 1]));
+				
+				Console.WriteLine("st block0: " + block[0]);
+				Console.WriteLine("st block1: " + block[1]);
+				
+				tea.encode(block, key);
+				
+				Console.WriteLine("enc block0: " + block[0]);
+				Console.WriteLine("enc block1: " + block[1]);
+				
+				Console.WriteLine("block0 bytes:");
+				foreach (var j in BitConverter.GetBytes(block[0]))
+					Console.WriteLine("  " + j);
+				
+				Console.WriteLine("block1 bytes:");
+				foreach (var j in BitConverter.GetBytes(block[1]))
+					Console.WriteLine("  " + j);
+				
+				Console.WriteLine(util.Base64Encode(block[0].ToString()));
+				Console.WriteLine(util.Base64Encode(block[1].ToString()));
+				
+				Console.WriteLine();
+				
+				//result += util.Base64Encode(BitConverter.GetBytes(block[0])) +
+				//	util.Base64Encode(BitConverter.GetBytes(block[1]));
+				result += util.Base64Encode(block[0].ToString()) +
+					util.Base64Encode(block[1].ToString());
+			}
+			Console.WriteLine("Result: " + result);
+			Console.WriteLine("[OUTPUT] File '" + path + "' has been TEA and Base64 encoded");
+
+			#region Writing file with encoded and non-encoded part
+			string encodedPath = path + ".enc";
+			// encoded part
+			File.WriteAllText(encodedPath, result);
+			// non-encoded part
+			FileStream ofile = File.OpenWrite(encodedPath);
+			ofile.Seek(encodeSize, 0);
+			for (uint i = blockNums; i < file_bytes.Length; i++)
+				ofile.WriteByte(file_bytes[i]);
+			ofile.Close();
+			Console.WriteLine("[OUTPUT] File '" + encodedPath + "' successfully written");
+			#endregion

 			return true;
 		}
@@ -44,28 +130,31 @@ namespace ModelCoder
 		[STAThread]
 		static void Main(string[] args)
 		{
-			IUtil util = new Util();
+			util = new Util();
+			tea = new TeaCoding();
+			dlltest = new dllimport();
+			//Console.WriteLine(dlltest.test("22"));

 			string fpath;
-			if (args.Length > 0) {
+			if (args.Length > 0)
 				fpath = args[0];
-			} else {
-		        Console.WriteLine("[OUTPUT] You can open file(s) with this program");
-		        Console.WriteLine("[OUTPUT] Or drag'n'drop on it");
-		        Console.Write("[INPUT] Enter filename (without spaces): ");
-		        fpath = Console.ReadLine();
+			else
+			{
+				Console.WriteLine("[OUTPUT] You can open file(s) with this program");
+				Console.WriteLine("[OUTPUT] Or drag'n'drop on it");
+				Console.Write("[INPUT] Enter filename (without spaces): ");
+				fpath = Console.ReadLine();
 			}

 			Console.Write("[INPUT] Enter key: ");
 			uint[] uKey = util.ConvertKey(Console.ReadLine());
-			
+
 			Console.WriteLine("[OUTPUT] Reading file(s)...");
-			if (args.Length > 1) {
+			if (args.Length > 0)
 				foreach (string i in args)
 					encodeFile(i, uKey);
-			} else {
+			else
 				encodeFile(fpath, uKey);
-			}

 			Console.Write("Press any key to continue . . . ");
 			Console.ReadKey(true);
--- a/base64/base64.cbp
+++ b/base64/base64.cbp
@@ -0,0 +1,51 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
+<CodeBlocks_project_file>
+	<FileVersion major="1" minor="6" />
+	<Project>
+		<Option title="base64" />
+		<Option pch_mode="2" />
+		<Option compiler="gcc" />
+		<Build>
+			<Target title="Debug">
+				<Option output="bin/Debug/base64" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Debug/" />
+				<Option type="3" />
+				<Option compiler="gcc" />
+				<Option createDefFile="1" />
+				<Option createStaticLib="1" />
+				<Compiler>
+					<Add option="-Wall" />
+					<Add option="-DBUILD_DLL" />
+					<Add option="-g" />
+				</Compiler>
+				<Linker>
+					<Add library="user32" />
+				</Linker>
+			</Target>
+			<Target title="Release">
+				<Option output="bin/Release/base64" prefix_auto="1" extension_auto="1" />
+				<Option object_output="obj/Release/" />
+				<Option type="3" />
+				<Option compiler="gcc" />
+				<Option createDefFile="1" />
+				<Option createStaticLib="1" />
+				<Compiler>
+					<Add option="-Wall" />
+					<Add option="-DBUILD_DLL" />
+					<Add option="-O2" />
+				</Compiler>
+				<Linker>
+					<Add option="-s" />
+					<Add library="user32" />
+				</Linker>
+			</Target>
+		</Build>
+		<Unit filename="base64.cpp" />
+		<Unit filename="base64.h" />
+		<Unit filename="main.cpp" />
+		<Unit filename="main.h" />
+		<Extensions>
+			<lib_finder disable_auto="1" />
+		</Extensions>
+	</Project>
+</CodeBlocks_project_file>
--- a/base64/base64.cpp
+++ b/base64/base64.cpp
@@ -0,0 +1,93 @@
+#include "base64.h"
+#include <iostream>
+
+static const std::string base64_chars =
+        "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+                "abcdefghijklmnopqrstuvwxyz"
+                "0123456789+/";
+
+
+static inline bool is_base64(BYTE c) {
+    return (isalnum(c) || (c == '+') || (c == '/'));
+}
+
+std::string base64encode(BYTE const* buf, unsigned int bufLen) {
+    std::string ret;
+    int i = 0, j = 0;
+    BYTE char_array_3[3], char_array_4[4];
+
+    while(bufLen--) {
+        char_array_3[i++] = *(buf++);
+        if(i == 3) {
+            char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
+            char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
+            char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
+            char_array_4[3] = char_array_3[2] & 0x3f;
+
+            for(i = 0; i < 4; i++)
+                ret += base64_chars[char_array_4[i]];
+            i = 0;
+        }
+    }
+
+    if(i) {
+        for(j = i; j < 3; j++)
+            char_array_3[j] = '\0';
+
+        char_array_4[0] = (char_array_3[0] & 0xfc) >> 2;
+        char_array_4[1] = ((char_array_3[0] & 0x03) << 4) + ((char_array_3[1] & 0xf0) >> 4);
+        char_array_4[2] = ((char_array_3[1] & 0x0f) << 2) + ((char_array_3[2] & 0xc0) >> 6);
+        char_array_4[3] = char_array_3[2] & 0x3f;
+
+        for(j = 0; j < (i + 1); j++)
+            ret += base64_chars[char_array_4[j]];
+
+        while(i++ < 3)
+            ret += '=';
+    }
+
+    return ret;
+}
+
+std::vector<BYTE> base64decode(std::string const& encoded_string) {
+    int in_len = encoded_string.size(),
+        i = 0,
+        j = 0,
+        in_ = 0;
+    BYTE char_array_4[4], char_array_3[3];
+    std::vector<BYTE> ret;
+
+    while(in_len-- && (encoded_string[in_] != '=') && is_base64(encoded_string[in_])) {
+        char_array_4[i++] = encoded_string[in_];
+        in_++;
+        if(i == 4) {
+            for(i = 0; i < 4; i++)
+                char_array_4[i] = base64_chars.find(char_array_4[i]);
+
+            char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
+            char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
+            char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
+
+            for(i = 0; i < 3; i++)
+                ret.push_back(char_array_3[i]);
+            i = 0;
+        }
+    }
+
+    if(i) {
+        for(j = i; j < 4; j++)
+            char_array_4[j] = 0;
+
+        for(j = 0; j < 4; j++)
+            char_array_4[j] = base64_chars.find(char_array_4[j]);
+
+        char_array_3[0] = (char_array_4[0] << 2) + ((char_array_4[1] & 0x30) >> 4);
+        char_array_3[1] = ((char_array_4[1] & 0xf) << 4) + ((char_array_4[2] & 0x3c) >> 2);
+        char_array_3[2] = ((char_array_4[2] & 0x3) << 6) + char_array_4[3];
+
+        for(j = 0; j < (i - 1); j++)
+            ret.push_back(char_array_3[j]);
+    }
+
+    return ret;
+}
--- a/base64/base64.depend
+++ b/base64/base64.depend
@@ -0,0 +1,17 @@
+# depslib dependency file v1.0
+1600530854 source:c:\users\jdm17\desktop\base64\base64.cpp
+	"base64.h"
+	<iostream>
+
+1600530854 c:\users\jdm17\desktop\base64\base64.h
+	<vector>
+	<string>
+
+1601296249 source:c:\users\jdm17\desktop\base64\main.cpp
+	"main.h"
+	"base64.h"
+
+1601297599 c:\users\jdm17\desktop\base64\main.h
+	<windows.h>
+	<string>
+
--- a/base64/base64.h
+++ b/base64/base64.h
@@ -0,0 +1,11 @@
+#ifndef _BASE64_H_
+#define _BASE64_H_
+
+#include <vector>
+#include <string>
+typedef unsigned char BYTE;
+
+std::string base64encode(BYTE const*, unsigned int);
+std::vector<BYTE> base64decode(std::string const&);
+
+#endif
--- a/base64/base64.layout
+++ b/base64/base64.layout
@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="UTF-8" standalone="yes" ?>
+<CodeBlocks_layout_file>
+	<FileVersion major="1" minor="0" />
+	<ActiveTarget name="Release" />
+	<File name="main.h" open="0" top="0" tabpos="0" split="0" active="1" splitpos="0" zoom_1="0" zoom_2="0">
+		<Cursor>
+			<Cursor1 position="334" topLine="6" />
+		</Cursor>
+	</File>
+	<File name="main.cpp" open="0" top="0" tabpos="0" split="0" active="1" splitpos="0" zoom_1="0" zoom_2="0">
+		<Cursor>
+			<Cursor1 position="242" topLine="0" />
+		</Cursor>
+	</File>
+	<File name="base64.cpp" open="0" top="0" tabpos="0" split="0" active="1" splitpos="0" zoom_1="0" zoom_2="0">
+		<Cursor>
+			<Cursor1 position="959" topLine="0" />
+		</Cursor>
+	</File>
+</CodeBlocks_layout_file>
--- a/base64/main.cpp
+++ b/base64/main.cpp
@@ -0,0 +1,37 @@
+#include "main.h"
+#include "base64.h"
+
+// a sample exported function
+void DLL_EXPORT SomeFunction(const LPCSTR sometext)
+{
+    MessageBoxA(0, sometext, "DLL Message", MB_OK | MB_ICONINFORMATION);
+}
+
+extern "C" DLL_EXPORT std::string Base64Encode(BYTE const* buf, unsigned int bufLen)
+{
+    return base64encode(buf, bufLen);
+}
+
+extern "C" DLL_EXPORT BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
+{
+    switch (fdwReason)
+    {
+        case DLL_PROCESS_ATTACH:
+            // attach to process
+            // return FALSE to fail DLL load
+            break;
+
+        case DLL_PROCESS_DETACH:
+            // detach from process
+            break;
+
+        case DLL_THREAD_ATTACH:
+            // attach to thread
+            break;
+
+        case DLL_THREAD_DETACH:
+            // detach from thread
+            break;
+    }
+    return TRUE; // succesful
+}
--- a/base64/main.h
+++ b/base64/main.h
@@ -0,0 +1,30 @@
+#ifndef __MAIN_H__
+#define __MAIN_H__
+
+#include <windows.h>
+
+/*  To use this exported function of dll, include this header
+ *  in your project.
+ */
+
+#ifdef BUILD_DLL
+    #define DLL_EXPORT __declspec(dllexport)
+#else
+    #define DLL_EXPORT __declspec(dllimport)
+#endif
+
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+//#include <string>
+void DLL_EXPORT SomeFunction(const LPCSTR sometext);
+//std::string DLL_EXPORT Base64Encode(unsigned char const* buf, unsigned int bufLen);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __MAIN_H__
--- a/model_coder.csproj
+++ b/model_coder.csproj
@@ -48,6 +48,10 @@
    <DefineConstants>TRACE</DefineConstants>
  </PropertyGroup>
  <ItemGroup>
+    <Reference Include="base64">
+      <HintPath>base64.dll</HintPath>
+      <EmbedInteropTypes>True</EmbedInteropTypes>
+    </Reference>
    <Reference Include="Microsoft.CSharp">
      <RequiredTargetFramework>4.0</RequiredTargetFramework>
    </Reference>
--- a/tea.cs
+++ b/tea.cs
@@ -12,62 +12,67 @@ namespace Tea
 {
 	public interface ITeaCoding
 	{
-		void code(uint[] v, uint[] k);
+		void encode(uint[] v, uint[] k);
 		//void decode(uint[] v, uint[] k);
 	}
 	public partial class TeaCoding: ITeaCoding
 	{
 		private readonly uint c_delta = 0x9E3779B9;

-		/*
+		
 		public void encode(uint[] v, uint[] k) {
 			uint v0 = v[0], v1 = v[1];
 			uint sum = 0;
-			//for(int i = 0; i < 32; i++) {
-			for(uint i = 32; i > 0; i--) {
-				//v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
-				//sum += c_delta;
-				//v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum >> 11) & 3]);
-
+			for (int i = 0; i < 32; i++) {
+			//for (uint i = 32; i > 0; i--) {
+				unchecked {
+					v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
+					sum += c_delta;
+					v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum >> 11) & 3]);
+				}
 				//sum += c_delta;
 				//v0 += (v1 << 4) + k[0] ^ v1 + sum ^ (v1 >> 5) + k[1];
 				//v1 += (v0 << 4) + k[2] ^ v0 + sum ^ (v0 >> 5) + k[3];

-				v0 += (v1 << 4 ^ v1 >> 5) + v1 ^ sum + k[sum & 3];
-		        sum += c_delta;
-		        v1 += (v0 << 4 ^ v0 >> 5) + v0 ^ sum + k[sum >> 11 & 3];
+				//v0 += (v1 << 4 ^ v1 >> 5) + v1 ^ sum + k[sum & 3];
+				//sum += c_delta;
+				//v1 += (v0 << 4 ^ v0 >> 5) + v0 ^ sum + k[sum >> 11 & 3];
 			}
 			v[0] = v0;
 			v[1] = v1;
 		}
-		*/
-		public void code(uint[] v, uint[] k)
+		/*
+		public void encode(uint[] v, uint[] k)
 		{
-		    uint y = v[0];
-		    uint z = v[1];
-		    uint sum = 0;
-		    uint n = 32;
+			uint y = v[0];
+			uint z = v[1];
+			uint sum = 0;
+			uint n = 32;

-		    while (n-- > 0)
-		    {
-		        y += (z << 4 ^ z >> 5) + z ^ sum + k[sum & 3];
-		        sum += c_delta;
-		        z += (y << 4 ^ y >> 5) + y ^ sum + k[sum >> 11 & 3];
-		    }
+			unchecked {
+				while (n-- > 0)
+				{
+					y += (z << 4 ^ z >> 5) + z ^ sum + k[sum & 3];
+					sum += c_delta;
+					z += (y << 4 ^ y >> 5) + y ^ sum + k[sum >> 11 & 3];
+				}
+			}

-		    v[0] = y;
-		    v[1] = z;
+			v[0] = y;
+			v[1] = z;
 		}
-
+		*/
 		/*
 		private readonly uint c_sum = 0xC6EF3720;
 		public void decode(uint[] v, uint[] k) {
 			uint v0 = v[0], v1 = v[1];
 			uint sum = c_sum;
 			for (int i = 0; i < 32; i++) {
-				v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum >> 11) & 3]);
-				sum -= c_delta;
-				v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
+				unchecked {
+					v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum >> 11) & 3]);
+					sum -= c_delta;
+					v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
+				}
 			}
 			v[0] = v0;
 			v[1] = v1;
--- a/test/partial_file_encode.enc
+++ b/test/partial_file_encode.enc
--- a/utils.cs
+++ b/utils.cs
@@ -18,43 +18,165 @@ namespace Utils
 		uint[] ConvertKey(string input);
 		uint ConvertStringToUInt(string input);
 		string ConvertUIntToString(uint input);
+		string Base64Encode(string plainText);
+		//string Base64Encode(byte[] plainText);
+		string Base64Decode(string base64EncodedData);
 	}
 	public partial class Util: IUtil
 	{
+		#region Convert Key to MD5, then to UInt
 		public uint[] ConvertKey(string input)
 		{
 			// MD5 Hashing	
 			var md5 = MD5.Create();
-	        byte[] inputBytes = Encoding.ASCII.GetBytes(input);
-	        byte[] hashBytes = md5.ComputeHash(inputBytes);
-	        var sb = new StringBuilder();
-	        for (int i = 0; i < hashBytes.Length; i++)
-	        	sb.Append(hashBytes[i].ToString("X2"));
-	        // Converting to uint[]
-	        string key = sb.ToString().ToLower().Substring(0, 16);
-	        var formattedKey = new uint[4];
+			byte[] inputBytes = Encoding.ASCII.GetBytes(input);
+			byte[] hashBytes = md5.ComputeHash(inputBytes);
+			var sb = new StringBuilder();
+			for (int i = 0; i < hashBytes.Length; i++)
+				sb.Append(hashBytes[i].ToString("X2"));
+			// Converting to uint[]
+			string key = sb.ToString().ToLower().Substring(0, 16);
+			var formattedKey = new uint[4];
 			int j = 0;
 			for (int i = 0; i < key.Length; i += 4)
 				formattedKey[j++] = ConvertStringToUInt(key.Substring(i, 4));
 			return formattedKey;
 		}
+		#endregion
+		#region Convert String to UInt and reverse
 		public uint ConvertStringToUInt(string input)
 		{
 			uint output;
-		    output =  ((uint)input[0]);
-		    output += ((uint)input[1] << 8);
-		    output += ((uint)input[2] << 16);
-		    output += ((uint)input[3] << 24);
-		    return output;
+			output =  ((uint)input[0]);
+			output += ((uint)input[1] << 8);
+			output += ((uint)input[2] << 16);
+			output += ((uint)input[3] << 24);
+			return output;
 		}
 		public string ConvertUIntToString(uint input)
 		{
-		    var output = new StringBuilder();
-		    output.Append((char)((input & 0xFF)));
-		    output.Append((char)((input >> 8) & 0xFF));
-		    output.Append((char)((input >> 16) & 0xFF));
-		    output.Append((char)((input >> 24) & 0xFF));
-		    return output.ToString();
+			var output = new StringBuilder();
+			output.Append((char)((input & 0xFF)));
+			output.Append((char)((input >> 8) & 0xFF));
+			output.Append((char)((input >> 16) & 0xFF));
+			output.Append((char)((input >> 24) & 0xFF));
+			return output.ToString();
 		}
+		#endregion
+		#region Base64 encoding/decoding
+		public string Base64Encode(string plainText)
+		{
+			var plainTextBytes = Encoding.UTF8.GetBytes(plainText);
+			return Convert.ToBase64String(plainTextBytes);
+		}
+		/*public string Base64Encode(byte[] data)
+			return Convert.ToBase64String(data);
+		public char[] Base64Encode(byte[] data)
+		{
+			int length, length2;
+			int blockCount;
+			int paddingCount;
+		
+			length = data.Length;
+		
+			if ((length % 3) == 0)
+			{
+				paddingCount = 0;
+				blockCount = length / 3;
+			}
+			else
+			{
+				paddingCount = 3 - (length % 3);
+				blockCount = (length + paddingCount) / 3;
+			}
+		
+			length2 = length + paddingCount;
+			
+			Console.WriteLine("length: " + length);
+			Console.WriteLine("length2: " + length2);
+			Console.WriteLine("blockCount: " + blockCount);
+			Console.WriteLine("paddingCount: " + paddingCount);
+		
+			byte[] source2;
+			source2 = new byte[length2];
+		
+			for (int x = 0; x < length2; x++)
+				source2[x] = x < length ? data[x] : (byte)0;
+		
+			byte b1, b2, b3;
+			byte temp, temp1, temp2, temp3, temp4;
+			var buffer = new byte[blockCount * 4];
+			var result = new char[blockCount * 4];
+		
+			for (int x = 0; x < blockCount; x++)
+			{
+				b1 = source2[x * 3];
+				b2 = source2[x * 3 + 1];
+				b3 = source2[x * 3 + 2];
+		
+				temp1 = (byte)((b1 & 252) >> 2);
+		
+				temp = (byte)((b1 & 3) << 4);
+				temp2 = (byte)((b2 & 240) >> 4);
+				temp2 += temp;
+		
+				temp = (byte)((b2 & 15) << 2);
+				temp3 = (byte)((b3 & 192) >> 6);
+				temp3 += temp;
+		
+				temp4 = (byte)(b3 & 63);
+		
+				buffer[x * 4] = temp1;
+				buffer[x * 4 + 1] = temp2;
+				buffer[x * 4 + 2] = temp3;
+				buffer[x * 4 + 3] = temp4;
+			}
+		
+			for (int x = 0; x < blockCount * 4; x++)
+				result[x] = SixBitToChar(buffer[x]);
+		
+			switch (paddingCount)
+			{
+				case 0:
+					break;
+				case 1:
+					result[blockCount * 4 - 1] = '=';
+					break;
+				case 2:
+					result[blockCount * 4 - 1] = '=';
+					result[blockCount * 4 - 2] = '=';
+					break;
+				default:
+					break;
+			}
+		
+			return result;
+		}
+		private static char SixBitToChar(byte b)
+		{
+			var lookupTable = new char[64] {
+				'A','B','C','D','E','F','G','H','I','J','K','L','M',
+				'N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
+				'a','b','c','d','e','f','g','h','i','j','k','l','m',
+				'n','o','p','q','r','s','t','u','v','w','x','y','z',
+				'0','1','2','3','4','5','6','7','8','9','+','/'
+			};
+		
+			if ((b >= 0) && (b <= 63))
+			{
+				return lookupTable[(int)b];
+			}
+			else
+			{
+				return ' ';
+			}
+		}*/
+
+		public string Base64Decode(string base64EncodedData)
+		{
+			var base64EncodedBytes = Convert.FromBase64String(base64EncodedData);
+			return Encoding.UTF8.GetString(base64EncodedBytes);
+		}
+		#endregion
 	}
 }