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i'am want to encrypt and decrypt text in textboxt.text in second form but what to adding the code, this is the code. thanks
Program.cs
using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Linq;
namespace Rc5_v2
{
static class Program
{
/// summary
/// The main entry point for the application.
/// summary
[STAThread]
static void Main()
{
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Main_form());
}
}
}
RC5.cs
using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Linq;
using System.Net.Mail;
using System.Net.Mime;
using System.Text.RegularExpressions;
using System.Web;
namespace Rc5_v2
{
class Rc5
{
uint[] s;
uint[] l;
uint b, u, t, c;
byte[] key;
int rounds;
public Rc5()
{
string str = "ModifyRC5";
key = GetKeyFromString(str);
rounds = 16;
b = (uint)key.Length;
u = 4;
t = (uint)(34);
c = 12 / u;
s = new uint[34];
l = new uint[12];
GenerateKey(key, rounds);
}
public Rc5(string password,int round)
{
key = GetKeyFromString(password);
rounds = round;
b = (uint)key.Length;
u = 4;
t = (uint)(2 * rounds + 2);
c = Math.Max(b, 1) / u;
s = new uint[2 * rounds + 2];
l = new uint[key.Length];
GenerateKey(key, rounds);
}
public Rc5(byte[] password, int round)
{
rounds = round;
key = password;
b = (uint)password.Length;
u = 4;
t = (uint)(2 * rounds + 2);
c = Math.Max(b, 1) / u;
s = new uint[2 * rounds + 2];
l = new uint[password.Length];
GenerateKey(key, rounds);
}
//to circulate int left
private uint leftRotate(uint x, int offset)
{
uint t1, t2;
t1 = x >> (32 - offset);
t2 = x << offset;
return t1 | t2;
}
//to circulate int right
private uint RightRotate(uint x, int offset)
{
uint t1, t2;
t1 = x << (32 - offset);
t2 = x >> offset;
return t1 | t2;
}
//encryption operation on two block
private void Encode(ref uint r1, ref uint r2, int rounds)
{
r1 = r1 + s[0];
r2 = r2 + s[1];
for (int i = 1; i <= rounds; i++)
{
r1 = leftRotate(r1 ^ r2, (int)r2) + s[2 * i];
r2 = leftRotate(r2 ^ r1, (int)r1) + s[2 * i + 1];
}
}
//decryption operation on two block
private void Decode(ref uint r1, ref uint r2, int rounds)
{
for (int i = rounds; i >= 1; i--)
{
r2 = (RightRotate(r2 - s[2 * i + 1], (int)r1)) ^ r1;
r1 = (RightRotate(r1 - s[2 * i], (int)r2)) ^ r2;
}
r2 = r2 - s[1];
r1 = r1 - s[0];
}
private void GenerateKey(byte[] key, int rounds)
{
uint P32 = uint.Parse("b7e15163", System.Globalization.NumberStyles.HexNumber);
uint Q32 = uint.Parse("9e3779b9", System.Globalization.NumberStyles.HexNumber);
for (int i = key.Length - 1; i >= 0; i--)
{
l[i] = leftRotate((uint)i, 8) + key[i];
}
s[0] = P32;
for (int i = 1; i <= t - 1; i++)
{
s[i] = s[i - 1] + Q32;
}
uint ii, jj;
ii = jj = 0;
uint x, y;
x = y = 0;
uint v = 3 * Math.Max(t, c);
//mixing key arrayes
for (int counter = 0; counter <= v; counter++)
{
x = s[ii] = leftRotate((s[ii] + x + y), 3);
y = l[jj] = leftRotate((l[jj] + x + y), (int)(x + y));
ii = (ii + 1) % t;
jj = (jj + 1) % c;
}
}
//convert key from string to byte array
private byte[] GetKeyFromString(string str)
{
char[] mykeyinchar = str.ToCharArray();
byte[] mykeyinbytes = new byte[mykeyinchar.Length];
for (int i = 0; i < mykeyinchar.Length; i++)
{
mykeyinbytes[i] = (byte)mykeyinchar[i];
}
return mykeyinbytes;
}
public void Encrypt(FileStream streamreader,FileStream streamwriter)
{
uint r1, r2;
System.IO.BinaryReader br = new System.IO.BinaryReader(streamreader);
System.IO.BinaryWriter bw = new System.IO.BinaryWriter(streamwriter);
long filelength = streamreader.Length;
while (filelength > 0)
{
try
{
r1 = br.ReadUInt32();
try
{
r2 = br.ReadUInt32();
}
catch
{
r2 = 0;
}
}
catch
{
r1 = r2 = 0;
}
Encode(ref r1, ref r2, rounds);
bw.Write(r1);
bw.Write(r2);
filelength -= 8;
}
streamreader.Close();
streamwriter.Close();
}
public void Decrypt(FileStream streamreader,FileStream streamwriter)
{
uint r1, r2;
System.IO.BinaryReader br = new System.IO.BinaryReader(streamreader);
System.IO.BinaryWriter bw = new System.IO.BinaryWriter(streamwriter);
long filelength = streamreader.Length;
while (filelength > 0)
{
try
{
r1 = br.ReadUInt32();
r2 = br.ReadUInt32();
Decode(ref r1, ref r2, rounds);
if (!(r1 == 0 && r2 == 0 && (filelength - 8 <= 0)))
{
bw.Write(r1);
bw.Write(r2);
}
if (r2 == 0 && (filelength - 8 <= 0))
{
bw.Write(r1);
}
filelength -= 8;
}
catch
{
System.Windows.Forms.MessageBox.Show("May be U try to decrypt an normal file (plain file)", "Error", System.Windows.Forms.MessageBoxButtons.OK, System.Windows.Forms.MessageBoxIcon.Error);
return;
}
}
streamreader.Close();
streamwriter.Close();
}
}
}
Form4.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net.Mail;
using System.Net;
namespace Rc5_v2
{
public partial class Form4 : Form
{
SmtpClient obj_SMTPClient;
MailMessage Obj_MailMsg;
Attachment obj_Attachment;
//int rounds01;
//string fileName01;
//string saveFileName01;
//string password01;
public Form4()
{
InitializeComponent();
}
private void Form4_Load(object sender, EventArgs e)
{
}
private void button1_Click(object sender, EventArgs e)
{
OpenFileDialog open = new OpenFileDialog();
if (open.ShowDialog() == DialogResult.OK)
{
label3.Text = open.FileName;
}
}
private void button3_Click(object sender, EventArgs e)
{
this.Close();
}
private void button2_Click(object sender, EventArgs e)
{
if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "")
{
MessageBox.Show("Please require, column must be content !!!");
}
else
try
{
obj_SMTPClient = new SmtpClient("smtp.gmail.com");
Obj_MailMsg = new MailMessage();
obj_Attachment = new System.Net.Mail.Attachment(label3.Text);
Obj_MailMsg.From = new MailAddress(textBox1.Text);
Obj_MailMsg.To.Add(textBox3.Text);
Obj_MailMsg.Body = textBox5.Text;
Obj_MailMsg.Attachments.Add(obj_Attachment);
Obj_MailMsg.Subject = textBox4.Text;
SmtpClient smtps = new SmtpClient("smtp.gmail.com", 587);
obj_SMTPClient.Credentials = new NetworkCredential();
obj_SMTPClient.Port = 587;
obj_SMTPClient.Credentials = new System.Net.NetworkCredential(textBox1.Text, textBox2.Text);
obj_SMTPClient.EnableSsl = true;
obj_SMTPClient.Send(Obj_MailMsg);
obj_SMTPClient.EnableSsl = true;
obj_SMTPClient.Send(Obj_MailMsg);
MessageBox.Show("Message Successful!!!");
}
catch
{
MessageBox.Show("Request TimeOut!!!");
}
}
private void button4_Click(object sender, EventArgs e)
{
foreach (Control sayre in this.Controls)
{
if (sayre is TextBox)
{
(sayre as TextBox).Clear();
}
}
}
private void button8_Click(object sender, EventArgs e)
{
foreach (Control sayre in this.Controls)
{
if (sayre is TextBox)
{
(sayre as TextBox).Clear();
}
}
}
private void Encrypt_Click(object sender, EventArgs e)
{
}
private void Decrypt_Click(object sender, EventArgs e)
{
}
}
}
modified 9-Jul-14 20:03pm.
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I am not wading through a large, unformatted pile of "code" looking for what you want me to help you with.
Edit your question, format the code using <pre> tags to preserve the formatting, and remove anything I don't need to help with your problem. Then, explain exactly what problem you have, and what help you need - remembering that we can't see your screen, access your HDD, or read your mind.
Help us to help you!
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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Yes and ofcourse but i'am want to encrypt and decrypt some string in textboxt not other. thanks 
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...but you couldn't be bothered to read what I wrote and actually do anything?
Why, pray, would I want to help you if you can't be bothered to help me to do it?
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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thanks for the answer, i will try in my own
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Does the code throw an error?
If you're wondering why you cannot decrypt using this code after closing the application, the answer would be that it generated a new key.
What kind of secret are you trying to encrypt? If it is a password, than you're introducing a new problem by encrypting it. Even if only the server knows how to decrypt - as it would mean that you can decrypt the users password. That's a security-issue; keep in mind that people often re-use their passwords.
Bastard Programmer from Hell 
If you can't read my code, try converting it here[^]
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1. Why does C# require the "new" keyword? why bother?? it's not like C++ where you need the functionality of memory allocation and calling the constructor
2. why does C# require the "return" keyword with a "get" function. What else would you use a get function for? besides returning data?? seems like an extra step where "get" is built in to the language
3. When CLR executes your code is the .net "engine" accessing kernel, user and or gdi.dll ? or does it have some other method of communicating with windows os kernel functions?
4. Does C# have an equivalent to the Doc/View architecture for windows apps?
thanks
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1. shiftwik wrote: you need the functionality of memory allocation and calling the constructor
It's an OO language. That means one would be creating objects.
2. shiftwik wrote: why does C# require the "return" keyword with a "get" function
..because that's how functions MUST return their value. The getter is merely function, and the last statement of such is always a return-statement.
3. shiftwik wrote: When CLR executes your code is the .net "engine" accessing kernel
The WinAPI. So, yes.
4. shiftwik wrote: Does C# have an equivalent to the Doc/View architecture for windows apps?
I'm too lazy to Google for Doc/View
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
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thanks Eddy, great reply!!!
you must be a college professor
Can anybody here help me with some intelligent in depth answers??
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1) For exactly the same reason as in C++.
2) If you don't like it, try VB.
You'll never get very far if all you do is follow instructions.
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1. Because the new keyword tells the application to instantiate an object at that point. If we have several different constructors on an object, new is a great way to tell the application that you expect a certain constructor to be invoked at that point. Merely referencing the object wouldn't be a great place to instantiate it because you could instantiate it long before you need it - and this would play hell doing things like building class factories.
2. Get is synctatic sugar that hides the fact that you are actually calling a special method with the prefix get_, so your code has to follow the standards of other methods. Another point to consider is, how would you indicate what you are returning? It's quite common to have some form of lazy initialisation or return choice in the getter, so you have to have some functionality in there to indicate what's going to be returned. Of course, if you don't actually need to do anything, just create an automatic property and you don't have to write a return statement (although one is implicitly created behind the scenes).
3. Yes. The .NET runtime and .NET applications are still PE Format applications.
4. That's just a pattern. While there's no default implementation of it in the framework, it's incredibly trivial to create although, as anyone who's worked with DocView will attest, the DocView pattern is severely limited in what it can do. There are a number of superior patterns available to use, such as MVC.
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Pete O'Hanlon wrote: There are a number of superior patterns available to use, such as MVC.
Would that be the Model View Controller pattern you're referring to there? I didn't realize that was applicable to anything but web applications, but I'll be happy to try a different pattern with C++.
The difficult we do right away...
...the impossible takes slightly longer.
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I was using MVC back in the late 90s with MFC - yes, for desktop apps. Ah, those were some fun days.
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1) Because if it didn't it wouldn't know when you wanted to create a new instance:
MyClass[] data = new MyClass[10];
MyClass instance;
for (int i = 0; i < 10; i++)
{
data = instance;
}How many different instances of MyClass should that produce? Zero? One? Ten? Or Eleven?
MyClass[] data = new MyClass[10];
MyClass instance;
for (int i = 0; i < 10; i++)
{
instance = new MyClass();
data = instance;
}Makes that abundantly clear.
2) See previous answers, particularly Pete's
3) Yes. Again, see Pete's answer.
4) No, thank goodness. D/V was good in it's time, but thankfully things have moved on a lot since those primitive days.
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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thanks ... I guess my question on "new" is why isn't it just automatic?
with C# it call delete for you. So why not new also?
would you ever not use it?
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Simply because C# doesn't try to "guess" what you wanted.
Think about it: I don't want the system creating a new instance every time I try to use an existing one, because it means a trip to the DB and back to create an item that I may not use again - and the "real" DB item then doesn't get updated.
I want the system to create an instance only when I specifically tell it to.
If the system created them for me, then
MyClass[] data = MyClass[10];
Would create an array of references to MyClass instances and the instances to fill it with.
I may not want that: if MyClass always contains an enormous Bitmap (for example) that is a huge amount of time and memory being wasted, because I'm about to fill the array with the top ten instances from the DB when I call the method below it:
MyClass[] data = MyClass[10];
DAL.GetImageData(data, 10, "SEARCH CONDITION"); But the system can't know that because it doesn't have any idea what the method does - it's in a separate DLL!
The new keyword allow you to specify exactly when you want an instance created (and reminds you that this could take some time and / or resources when it does it)
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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BTW:
shiftwik wrote: with C# it call delete for you
No, it doesn't - it calls Dispose for you, but not at a time of your chosing, unless you specifically add a using block: objects are only ever deleted when the Garbage Collector gets around to it, which may never happen! 
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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Dispose will only ever be called at a time of your choosing - either from the end of a using block, or when you explicitly call it.
It's the finalizer - ~ClassName(){ ... } - that gets called by the GC at some random time in the future.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Yes, you are right - and the finalizer should call Dispose(false)...
I plead stupidity...and a lack of caffeine.
Those who fail to learn history are doomed to repeat it. --- George Santayana (December 16, 1863 – September 26, 1952)
Those who fail to clear history are doomed to explain it. --- OriginalGriff (February 24, 1959 – ∞)
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Should call Dispose if you are implementing the IDisposable Interface 
You usually only use it to ensure that unmanaged resources are released, to prevent memory leaks. Either immediatly when Dispose gets called or when the GC calls the Finalize Method (which you have to override in that case), in case it didn't get called by the code which held the reference to it.
You might also use it to free resources before the GC kicks in (by setting large fields like lists etc. to null and thus making it easier for the GC to collect those resources). 
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Nicholas Marty wrote: Should call Dispose if you are implementing the IDisposable Interface
If your class has a finalizer and doesn't implement IDisposable, that's almost certainly a bug.
I can't think of any reason why your class would say, "I want this resource to possibly be cleaned up at some unknown point in the future, but I don't want the calling code to be able to clean it up immediately".
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Every Type has a finalizer as every object inherits from System.Object at some point. You may or may not override it. But it still has a finalizer 
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The Object class provides no implementation for the Finalize method, and the garbage collector does not mark types derived from Object for finalization unless they override the Finalize method.
So whilst it's technically true that every object has a finalizer, only objects which override the finalizer will be marked for finalization. 
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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