Encode and decode in CSharp – C#

Tuesday, April 4th, 2017 (0 Comment)

In here, we will do simple exercise about encode and decode in CSharp – C#.

We have two ways encode and decode a string in CSharp (simple and with key).

1) Encode and decode in CSharp without key

Encode function

static String Base64Encode(String textIn)
{
	var _encode = Encoding.UTF8.GetBytes(textIn);
	return Convert.ToBase64String(_encode);
}

static String Base64Encode(String textIn)

{

var _encode = Encoding.UTF8.GetBytes(textIn);

return Convert.ToBase64String(_encode);

}

Decode function

static String Base64Decode(String encode)
{
	var decode = Convert.FromBase64String(encode);
	return Encoding.UTF8.GetString(decode);
}

static String Base64Decode(String encode)

{

var decode = Convert.FromBase64String(encode);

return Encoding.UTF8.GetString(decode);

}

Run

static void Example1()
{
//Encode and decode in CSharp without key
	var text = "Hello Lvtutorial";
	Console.WriteLine(text);
	Console.WriteLine("Start encoding...");
	var encode = Base64Encode(text);
	Console.WriteLine("encode is : " + encode);
	var decode = Base64Decode(encode);
	Console.WriteLine("decode is : " + decode);

}

static void Example1()

{

//Encode and decode in CSharp without key

var text = "Hello Lvtutorial";

Console.WriteLine(text);

Console.WriteLine("Start encoding...");

var encode = Base64Encode(text);

Console.WriteLine("encode is : " + encode);

var decode = Base64Decode(encode);

Console.WriteLine("decode is : " + decode);

}

Output:

Hello Lvtutorial
Start encoding...
encode is : SGVsbG8gTHZ0dXRvcmlhbA==
decode is : Hello Lvtutorial
Press any key to continue . . .

Hello Lvtutorial

Start encoding...

encode is : SGVsbG8gTHZ0dXRvcmlhbA==

decode is : Hello Lvtutorial

Press any key to continue . . .

2) Encode and decode in CSharp with key

Encode function

static String encodeWithKey(String textIn, String key)
{
	var _crypt = new TripleDESCryptoServiceProvider();
	var _hashmd5 = new MD5CryptoServiceProvider();

	var _byteHash = _hashmd5.ComputeHash(Encoding.UTF8.GetBytes(key));
	var _byteText = Encoding.UTF8.GetBytes(textIn);

	_crypt.Key = _byteHash;
	_crypt.Mode = CipherMode.ECB;

	var _encodeByte = _crypt.CreateEncryptor().TransformFinalBlock(_byteText, 0, _byteText.Length);

	return Convert.ToBase64String(_encodeByte) ;
}

static String encodeWithKey(String textIn, String key)

{

var _crypt = new TripleDESCryptoServiceProvider();

var _hashmd5 = new MD5CryptoServiceProvider();

var _byteHash = _hashmd5.ComputeHash(Encoding.UTF8.GetBytes(key));

var _byteText = Encoding.UTF8.GetBytes(textIn);

_crypt.Key = _byteHash;

_crypt.Mode = CipherMode.ECB;

var _encodeByte = _crypt.CreateEncryptor().TransformFinalBlock(_byteText, 0, _byteText.Length);

return Convert.ToBase64String(_encodeByte) ;

}

Decode function

static String decodeWithKey(String encode, String key)
{
	var _crypt = new TripleDESCryptoServiceProvider();
	var _hashmd5 = new MD5CryptoServiceProvider();

	var _byteHash = _hashmd5.ComputeHash(Encoding.UTF8.GetBytes(key));
	var _byteText = Convert.FromBase64String(encode);

	_crypt.Key = _byteHash;
	_crypt.Mode = CipherMode.ECB;

	var decodeByte = _crypt.CreateDecryptor().TransformFinalBlock(_byteText, 0, _byteText.Length);

	return Encoding.UTF8.GetString(decodeByte);
}

static String decodeWithKey(String encode, String key)

{

var _crypt = new TripleDESCryptoServiceProvider();

var _hashmd5 = new MD5CryptoServiceProvider();

var _byteHash = _hashmd5.ComputeHash(Encoding.UTF8.GetBytes(key));

var _byteText = Convert.FromBase64String(encode);

_crypt.Key = _byteHash;

_crypt.Mode = CipherMode.ECB;

var decodeByte = _crypt.CreateDecryptor().TransformFinalBlock(_byteText, 0, _byteText.Length);

return Encoding.UTF8.GetString(decodeByte);

}

Run

static void Example2()
{
//Encode and decode in CSharp with key
	var text = "Hello Lvtutorial";
	var key = "Your Password";
	Console.WriteLine("text: " + text);
	Console.WriteLine("key: " + key);
	Console.WriteLine("Start encoding with key...");
	var encode = encodeWithKey(text, key);
	Console.WriteLine("encode is : " + encode);
	var decode = decodeWithKey(encode, key);
	Console.WriteLine("decode is : " + decode);

}

static void Example2()

{

//Encode and decode in CSharp with key

var text = "Hello Lvtutorial";

var key = "Your Password";

Console.WriteLine("text: " + text);

Console.WriteLine("key: " + key);

Console.WriteLine("Start encoding with key...");

var encode = encodeWithKey(text, key);

Console.WriteLine("encode is : " + encode);

var decode = decodeWithKey(encode, key);

Console.WriteLine("decode is : " + decode);

}

Output:

text: Hello Lvtutorial
key: Your Password
Start encoding with key...
encode is : JB/ipdCvlX46cXRsnmoJsxrEiWvel+xf
decode is : Hello Lvtutorial
Press any key to continue . . .

text: Hello Lvtutorial

key: Your Password

Start encoding with key...

encode is : JB/ipdCvlX46cXRsnmoJsxrEiWvel+xf

decode is : Hello Lvtutorial

Press any key to continue . . .

Tags: C#, CSharp, encode and decode in C#, encode C#, sample c# code

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Encode and decode in CSharp – C#

1) Encode and decode in CSharp without key

2) Encode and decode in CSharp with key

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