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Posted 20 Feb 2008

Simple String Encryption and Decryption with Source Code

, 21 Feb 2008 CPOL
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Sample program for simple encryption and decryption of strings

Introduction

This article helps the C# beginners to do simple encryption and decryption of strings. It will be useful for simple password encryption or any such string encryption.

Encryption using the default key:

Encryption1.jpg

Encryption using the user's custom key:

Encryption.jpg

Decryption using the user's custom key:

Using the Code

The demo application uses a class SSTCryptographer which contains two static overloaded methods and a static property. 

How To Use the Given Code

On Button clicks:

private void btnEncrypt_Click(object sender, EventArgs e)
{ 
txtOutputText.Text = SSTCryptographer.Encrypt(txtInputText.Text,SetKey());
}
private void btnDecrypt_Click(object sender, EventArgs e)
{
txtOutputText.Text = SSTCryptographer.Decrypt(txtInputText.Text,SetKey());
}

/// <summary>
/// Encrypt the given string using the default key.
/// </summary>
/// <param name="strToEncrypt">The string to be encrypted.</param>
/// <returns>The encrypted string.</returns>
public static string Encrypt(string strToEncrypt)
{
    try
    {
        return Encrypt(strToEncrypt, _key);
    }

    catch (Exception ex)
    {
        return "Wrong Input. " + ex.Message;
    }
} 

/// <summary>
/// Decrypt the given string using the default key.
/// </summary>
/// <param name="strEncrypted">The string to be decrypted.</param>
/// <returns>The decrypted string.</returns>
public static string Decrypt(string strEncrypted)
{
    try
    {
        return Decrypt(strEncrypted, _key);
    }
    catch (Exception ex)
    {
        return "Wrong Input. " + ex.Message;
    }
}

/// <summary>
/// Encrypt the given string using the specified key.
/// </summary>
/// <param name="strToEncrypt">The string to be encrypted.</param>
/// <param name="strKey">The encryption key.</param>
/// <returns>The encrypted string.</returns>
public static string Encrypt(string strToEncrypt, string strKey)
{
    try
    {
        TripleDESCryptoServiceProvider objDESCrypto = 
			new TripleDESCryptoServiceProvider();
        MD5CryptoServiceProvider objHashMD5 = new MD5CryptoServiceProvider();
        byte[] byteHash, byteBuff;
        string strTempKey = strKey;
        byteHash = objHashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(strTempKey));
        objHashMD5 = null;
        objDESCrypto.Key = byteHash;
        objDESCrypto.Mode = CipherMode.ECB; //CBC, CFB
        byteBuff = ASCIIEncoding.ASCII.GetBytes(strToEncrypt);
        return Convert.ToBase64String(objDESCrypto.CreateEncryptor().
			TransformFinalBlock(byteBuff, 0, byteBuff.Length));
    }
    catch (Exception ex)
    {
        return "Wrong Input. " + ex.Message;
    }
}

/// <summary>
/// Decrypt the given string using the specified key.
/// </summary>
/// <param name="strEncrypted">The string to be decrypted.</param>
/// <param name="strKey">The decryption key.</param>
/// <returns>The decrypted string.</returns>
public static string Decrypt(string strEncrypted, string strKey)
{
    try
    {
        TripleDESCryptoServiceProvider objDESCrypto = 
			new TripleDESCryptoServiceProvider();
        MD5CryptoServiceProvider objHashMD5 = new MD5CryptoServiceProvider();
        byte[] byteHash, byteBuff;
        string strTempKey = strKey;
        byteHash = objHashMD5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(strTempKey));
        objHashMD5 = null;
        objDESCrypto.Key = byteHash;
        objDESCrypto.Mode = CipherMode.ECB; //CBC, CFB
        byteBuff = Convert.FromBase64String(strEncrypted);
        string strDecrypted = ASCIIEncoding.ASCII.GetString
		(objDESCrypto.CreateDecryptor().TransformFinalBlock
		(byteBuff, 0, byteBuff.Length));
        objDESCrypto = null;
        return strDecrypted;
    }
    catch (Exception ex)
    {
        return "Wrong Input. " + ex.Message;
    }
}

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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About the Author

Lovely M
Software Developer (Senior) Santhisoft Technologies
India India

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Comments and Discussions

 
QuestionNice article Pin
lintovadakkekudy6-Mar-12 20:11
memberlintovadakkekudy6-Mar-12 20:11 
AnswerRe: Nice article Pin
Lovely M29-Jul-13 19:48
memberLovely M29-Jul-13 19:48 
QuestionCharacter sets Pin
Mark Roebuck3-Sep-11 2:32
memberMark Roebuck3-Sep-11 2:32 
AnswerRe: Character sets Pin
glennswest6-Oct-11 23:48
memberglennswest6-Oct-11 23:48 
GeneralI want to use my code for encrypt Pin
Mayur Gujrathiii26-May-11 22:00
memberMayur Gujrathiii26-May-11 22:00 
QuestionENCRYPT AND DECRYPT HELP Pin
rsdelrosario28-Jul-10 22:58
memberrsdelrosario28-Jul-10 22:58 
QuestionRe: ENCRYPT AND DECRYPT HELP Pin
rsdelrosario28-Jul-10 23:04
memberrsdelrosario28-Jul-10 23:04 
GeneralHELPPPPPPPPPPPPPP Pin
barbiez23-May-10 8:14
memberbarbiez23-May-10 8:14 
i have an encrypted code and i have no idea how to get this to work.
GeneralRe: HELPPPPPPPPPPPPPP Pin
Lovely M23-May-10 18:14
memberLovely M23-May-10 18:14 
GeneralThanks Pin
Mushtaque Nizamani7-May-09 20:20
memberMushtaque Nizamani7-May-09 20:20 
GeneralRe: Thanks Pin
Lovely M7-May-09 21:48
memberLovely M7-May-09 21:48 
AnswerRe: qusetuion Pin
Lovely M21-Dec-08 17:53
memberLovely M21-Dec-08 17:53 
GeneralString reference not set to an instance of String Pin
Asanda8-Sep-08 1:48
memberAsanda8-Sep-08 1:48 
GeneralRe: String reference not set to an instance of String Pin
Lovely M8-Sep-08 18:37
memberLovely M8-Sep-08 18:37 
GeneralRe: String reference not set to an instance of String Pin
Asanda9-Sep-08 2:46
memberAsanda9-Sep-08 2:46 
GeneralRe: String reference not set to an instance of String Pin
Lovely M9-Sep-08 18:35
memberLovely M9-Sep-08 18:35 
GeneralThanks! Thank You! And More Thanks! Pin
microbus22-Jul-08 11:13
membermicrobus22-Jul-08 11:13 
GeneralThanks a lot Pin
Abhi suryawanshi4-Jul-08 21:35
memberAbhi suryawanshi4-Jul-08 21:35 
QuestionInvalid length for a Base-64 char array. Pin
moistllama20-Mar-08 4:30
membermoistllama20-Mar-08 4:30 
AnswerRe: Invalid length for a Base-64 char array. Pin
Amar Chaudhary29-Apr-08 20:34
memberAmar Chaudhary29-Apr-08 20:34 
QuestionHow to decrypt an encrypted string using MD5 algorithm Pin
Member 277185122-Feb-08 17:58
memberMember 277185122-Feb-08 17:58 
GeneralNice article Pin
Rajib Ahmed20-Feb-08 9:13
memberRajib Ahmed20-Feb-08 9:13 
GeneralRe: Nice article [modified] Pin
Lovely M20-Feb-08 9:55
memberLovely M20-Feb-08 9:55 

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