It’s been quite a while since I last posted on here. Anyway, here is a class that encrypts data and encodes it using base64 for use in querystrings. The decrypt function does the opposite thing.. it first decodes and then decryptes the string.
public class Encryption64
{
private byte[] key = {};
private byte[] IV = {18, 52, 86, 120, 144, 171, 205, 239};
public string Decrypt(string stringToDecrypt, string sEncryptionKey)
{
byte[] inputByteArray = new byte[stringToDecrypt.Length + 1];
try {
key = System.Text.Encoding.UTF8.GetBytes(sEncryptionKey.Substring(0, 8));
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
inputByteArray = Convert.FromBase64String(stringToDecrypt);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(key, IV), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
System.Text.Encoding encoding = System.Text.Encoding.UTF8;
return encoding.GetString(ms.ToArray());
}
catch (Exception e) {
return e.Message;
}
}
public string Encrypt(string stringToEncrypt, string sEncryptionKey)
{
try {
key = System.Text.Encoding.UTF8.GetBytes(sEncryptionKey.Substring(0, 8));
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray = Encoding.UTF8.GetBytes(stringToEncrypt);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(key, IV), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
return Convert.ToBase64String(ms.ToArray());
}
catch (Exception e) {
return e.Message;
}
}
}
