using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks;
namespace SafeMobileLib
{
public class TripleDESEncryption
{
//Encryption Key
private byte[] EncryptionKey { get; set; }
// The Initialization Vector for the DES encryption routine
private byte[] IV { get; set; }
public TripleDESEncryption()
{
String encryptionKey ="sPBAq4EqProzr6sQEfF1CJy6";
String IV = "z3LgLZQU";
Initialize(encryptionKey, IV);
}
/// Constructor for TripleDESImplementation class
///
/// The 24-byte encryption key (24 character ASCII)
/// The 8-byte DES encryption initialization vector (8 characters ASCII)
public TripleDESEncryption(string encryptionKey, string IV)
{
Initialize(encryptionKey, IV);
}
public void Initialize(string encryptionKey, string IV)
{
if (string.IsNullOrEmpty(encryptionKey))
{
throw new ArgumentNullException("'encryptionKey' parameter cannot be null.", "encryptionKey");
}
if (string.IsNullOrEmpty(IV))
{
throw new ArgumentException("'IV' parameter cannot be null or empty.", "IV");
}
EncryptionKey = Encoding.ASCII.GetBytes(encryptionKey);
// Ensures length of 24 for encryption key
Trace.Assert(EncryptionKey.Length == 24, "Encryption key must be exactly 24 characters of ASCII text (24 bytes)");
this.IV = Encoding.ASCII.GetBytes(IV);
// Ensures length of 8 for init. vector
Trace.Assert(IV.Length == 8, "Init. vector must be exactly 8 characters of ASCII text (8 bytes)");
}
/// Encrypts a text block
public string Encrypt(string textToEncrypt)
{
TripleDESCryptoServiceProvider tdes = new TripleDESCryptoServiceProvider();
tdes.Key = EncryptionKey;
tdes.IV = IV;
byte[] buffer = Encoding.ASCII.GetBytes(textToEncrypt);
return Convert.ToBase64String(tdes.CreateEncryptor().TransformFinalBlock(buffer, 0, buffer.Length));
}
/// Decrypts an encrypted text block
public string Decrypt(string textToDecrypt)
{
byte[] buffer = Convert.FromBase64String(textToDecrypt);
TripleDESCryptoServiceProvider des = new TripleDESCryptoServiceProvider();
des.Key = EncryptionKey;
des.IV = IV;
return Encoding.ASCII.GetString(des.CreateDecryptor().TransformFinalBlock(buffer, 0, buffer.Length));
}
}
}