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Decrypt String Data

Posted By:Lakhan Pal Garg       Posted Date: October 06, 2009    Points: 10    Category: Encryption & Decryption    URL: http://www.dotnetspark.com  

To decrypt data we need to pass the encrypted string data.
To see the code to Encrypt string data click here

public static string Decrypt(string cipherString)

byte[] keyArray;
//get the byte code of the string
byte[] toEncryptArray = Convert.FromBase64String(cipherString);
string key = ")(*&";
//if hashing was used get the hash code with regards to your key
MD5CryptoServiceProvider hashmd5 = new MD5CryptoServiceProvider();
keyArray = hashmd5.ComputeHash(UTF8Encoding.UTF8.GetBytes(key));
//release any resource held by the MD5CryptoServiceProvider

TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
//set the secret key for the tripleDES algorithm
tdes.Key = keyArray;
//mode of operation. there are other 4 modes. We choose ECB(Electronic code Book)

tdes.Mode = CipherMode.ECB;
//padding mode(if any extra byte added)
tdes.Padding = PaddingMode.PKCS7;

ICryptoTransform cTransform = tdes.CreateDecryptor();
byte[] resultArray = cTransform.TransformFinalBlock(toEncryptArray, 0, toEncryptArray.Length);
//Release resources held by TripleDes Encryptor
//return the Clear decrypted TEXT
return UTF8Encoding.UTF8.GetString(resultArray);
Thanks & Regards
Lakhan Pal Garg


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