[danmor498]

not certain that i did it a the writh place but here it is

looking for a way to encrypt and decrypt text from richtextbox in c#

using sha encrypting simple way since i am a beginner in c# and all i founded in this mather is for password i allready have one.

tank's again for giving me this opportunetie

danmor498

ps; excuse my english since i am french Can. i may be having a bit of troubles to write it properly.

[Martyr2]

Welcome to Dream.In.Code danmor498! This is the meet and greet forum and not for programming questions. I will happily move it to the C# forum so that the experts there can help you out. Welcome aboard!

[baavgai]

For most password encryption, it's a one way hash. You can't get the password from the hash, but if you have the right password, it will result in the hash you have.

Here's a quick program in C# to show a way to do it.

using System;
using System.Text;
using System.Diagnostics;
using System.Security.Cryptography;

namespace ConsoleApplication1 {
	class Program {
		HashAlgorithm hasher = new SHA1CryptoServiceProvider();

		public byte[] getHashForString(string s) {
			byte[] bytes = System.Text.Encoding.UTF8.GetBytes(s);
			return hasher.ComputeHash(bytes);
		}

		public bool IsMatch(byte[] hash1, byte[] hash2) {
			if (hash1.Length != hash2.Length) { return false; }
			for (int i = 0; i < hash1.Length; i++) {
				if (hash1[i] != hash2[i]) { return false; }
			}
			return true;
		}

		public bool IsMatch(byte[] passHash, string password) {
			return IsMatch(passHash, getHashForString(password));
		}

		static void Main(string[] args) {
			Program pgm = new Program();
			string password = "harvey99";
			byte[] passwordHash = pgm.getHashForString(password);
			Debug.WriteLine("password=" + password);
			Debug.WriteLine(pgm.IsMatch(passwordHash, "foo"));
			Debug.WriteLine(pgm.IsMatch(passwordHash, "harvey98"));
			Debug.WriteLine(pgm.IsMatch(passwordHash, "harvey99"));
		}
	}
}

Hope this helps.

This post has been edited by baavgai: 17 January 2008 - 11:48 AM

[danmor498]

Martyr2, on 17 Jan, 2008 - 12:26 PM, said:

Welcome to Dream.In.Code danmor498! This is the meet and greet forum and not for programming questions. I will happily move it to the C# forum so that the experts there can help you out. Welcome aboard!

Sorry for that i will try not to do it again have a nyce day

baavgai, on 17 Jan, 2008 - 01:48 PM, said:

For most password encryption, it's a one way hash. You can't get the password from the hash, but if you have the right password, it will result in the hash you have.

Here's a quick program in C# to show a way to do it.

using System;
using System.Text;
using System.Diagnostics;
using System.Security.Cryptography;

namespace ConsoleApplication1 {
	class Program {
		HashAlgorithm hasher = new SHA1CryptoServiceProvider();

		public byte[] getHashForString(string s) {
			byte[] bytes = System.Text.Encoding.UTF8.GetBytes(s);
			return hasher.ComputeHash(bytes);
		}

		public bool IsMatch(byte[] hash1, byte[] hash2) {
			if (hash1.Length != hash2.Length) { return false; }
			for (int i = 0; i < hash1.Length; i++) {
				if (hash1[i] != hash2[i]) { return false; }
			}
			return true;
		}

		public bool IsMatch(byte[] passHash, string password) {
			return IsMatch(passHash, getHashForString(password));
		}

		static void Main(string[] args) {
			Program pgm = new Program();
			string password = "harvey99";
			byte[] passwordHash = pgm.getHashForString(password);
			Debug.WriteLine("password=" + password);
			Debug.WriteLine(pgm.IsMatch(passwordHash, "foo"));
			Debug.WriteLine(pgm.IsMatch(passwordHash, "harvey98"));
			Debug.WriteLine(pgm.IsMatch(passwordHash, "harvey99"));
		}
	}
}

Hope this helps.

Thank for the password encrytion code Have a nyce day