/// <summary>
/// Encrypts a strings passed in using Electronic Code Book Cipher
/// </summary>
/// <param name="stringToEncrypt">String to encrypt</param>
/// <param name="password">password needed to unlock encrypted string</param>
/// <returns>A new string that must have the same password passed in to unlock.</returns>
public static string EncryptString(string stringToEncrypt)
{
// Initial Value
string encryptedString = null;
// locals
TripleDESCryptoServiceProvider des;
MD5CryptoServiceProvider hashmd5;
byte[] pwdhash;
byte[] buff;
// authorization code needed to decrypt password.
string authorizationCode = "worldclass";
try
{
// Verify String Does Exist and is not null
if (!String.IsNullOrEmpty(stringToEncrypt))
{
// encrypted system password here
string systemPassword = "******";
// now decrypt password
string password = CryptographyManager.DecryptString(systemPassword, authorizationCode);
// create MD5 Service
hashmd5 = new MD5CryptoServiceProvider();
// compute password has
pwdhash = hashmd5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(password));
// dispose of hashmd5
hashmd5 = null;
// implement DES3 encryption
des = new TripleDESCryptoServiceProvider();
// the key is the secret password hash.
des.Key = pwdhash;
// Electronic Code Book Cipher (CBC, CFB)
des.Mode = CipherMode.ECB;
// Set Buffer To stringToEncrypt
buff = ASCIIEncoding.ASCII.GetBytes(stringToEncrypt);
// Get Encrypted String
encryptedString = Convert.ToBase64String(des.CreateEncryptor().TransformFinalBlock(buff, 0, buff.Length));
}
}
catch
{
}
// Return Encrypted String
return(encryptedString);
}
/// <summary>
/// Decrypts a string passed in.
/// </summary>
/// <param name="stringToDecrypt">String that needs to be deciphered.</param>
/// <param name="Password">Code to unlock this password.</param>
/// <returns></returns>
public static string DecryptString(string stringToDecrypt)
{
// initial value
string decryptedString = null;
// locals
TripleDESCryptoServiceProvider des;
MD5CryptoServiceProvider hashmd5;
byte[] pwdhash;
byte[] buff;
// authorization code needed to decrypt password.
string authorizationCode = "worldclass";
try
{
// encrypted system password here
string systemPassword = "******";
// now decrypt password
string password = CryptographyManager.DecryptString(systemPassword, authorizationCode);
// Create MD5 CryptoServiceProvider
hashmd5 = new MD5CryptoServiceProvider();
// computer password hash
pwdhash = hashmd5.ComputeHash(ASCIIEncoding.ASCII.GetBytes(password));
// dispose of object
hashmd5 = null;
//implement DES3 encryption
des = new TripleDESCryptoServiceProvider();
//the key is the secret password hash.
des.Key = pwdhash;
// Electronic Code Book Cipher (CBC, CFB)
des.Mode = CipherMode.ECB;
// Decrypt String
buff = Convert.FromBase64String(stringToDecrypt);
//decrypt DES 3 encrypted byte buffer and return ASCII string
decryptedString = ASCIIEncoding.ASCII.GetString(des.CreateDecryptor().TransformFinalBlock(buff, 0, buff.Length));
}
catch
{
}
// Return Value
return(decryptedString);
}
