/// <summary>
/// Decrpyt data from the database (Two way encryption)
/// </summary>
/// <param name="encrpytedData">Data to be decrypted</param>
/// <param name="encryptionPass">Encrpyption password</param>
/// <param name="isSearchTerm">Is this a database search term?</param>
/// <returns></returns>
public static string DecrpytData(string encrpytedData, string encryptionPass, bool isSearchTerm = false)
{
if (isSearchTerm)
{
return(AESTwoWayEncryption.Decrypt <TripleDESCryptoServiceProvider>(encrpytedData, encryptionPass, defaultSALT));
}
string salt = encrpytedData.Substring(0, 8);
string toDecrypt = encrpytedData.Substring(8, encrpytedData.Count() - 8);
return(AESTwoWayEncryption.Decrypt <TripleDESCryptoServiceProvider>(toDecrypt, encryptionPass, salt));
}
/// <summary>
/// Decrypt file into original file contents
/// </summary>
/// <param name="fileContents">Original file contents</param>
/// <param name="encryptionPassword">Encryption password</param>
public static string[] DecryptFile(string[] encryptedContents, string encrpytionPassword)
{
string encryptionString = CombineStringArray(encryptedContents);
string[] parts = encryptionString.Split(new string[] { "|SSPP|" }, StringSplitOptions.None); //Split encrypted data to get string and main contents
string salt = parts[0];
string decrpytedData = AESTwoWayEncryption.Decrypt <TripleDESCryptoServiceProvider>(parts[1], encrpytionPassword, salt);
string[] seperatedString = decrpytedData.Split(new string[] { "@NL#" }, StringSplitOptions.None); //Split string back up into original lines
return(seperatedString);
}
/// <summary>
/// Encrypt file contents into multiple lines
/// </summary>
/// <param name="fileContents">Original file contents</param>
/// <param name="encryptionPassword">Encryption password</param>
/// <param name="salt">Cryptographically genereated salt key</param>
/// <returns></returns>
public static string[] EncryptFile(string[] fileContents, string encryptionPassword, string salt)
{
string fullString = "";
foreach (string s in fileContents)
{
fullString += s + "@NL#"; //Characters denotes new line
}
string toEncrypt = fullString.Substring(0, fullString.Length - 4);
string encrpytedData = salt + "|SSPP|" + AESTwoWayEncryption.Encrypt <TripleDESCryptoServiceProvider>(toEncrypt, encryptionPassword, salt); //Salt string partion point seperates data and salt
return(SplitStringEveryN(encrpytedData, 20));
}
/// <summary>
/// Encrypt data to be put into the database (Two way encrpytion) || Not to be used for passwords
/// </summary>
/// <param name="data">Data to be encrypted</param>
/// <param name="encryptionPass">Encrpytion password</param>
/// <param name="isSearchTerm">Is this a database search term?</param>
/// <returns></returns>
public static string EncryptData(string data, string encryptionPass, bool isSearchTerm = false)
{
string salt = GenerateNewSALT(8);
if (isSearchTerm)
{
salt = defaultSALT;
}
string encryptedString = AESTwoWayEncryption.Encrypt <TripleDESCryptoServiceProvider>(data, encryptionPass, salt);
if (isSearchTerm)
{
return(encryptedString);
}
return(salt + encryptedString);
}
