public static string MD5Encryption(string stringToEncrypt, EncryptionKey encryptionKey)
{
byte[] sourceBytes;
System.Text.UTF8Encoding UTF8 = new System.Text.UTF8Encoding();
// Step 1. We hash the passphrase using MD5
// We use the MD5 hash generator as the result is a 128 bit byte array
// which is a valid length for the TripleDES encoder we use below
MD5CryptoServiceProvider mcsp = new MD5CryptoServiceProvider();
byte[] TDESByte = mcsp.ComputeHash(UTF8.GetBytes(encryptionKey.GetCustomDescription()));
// Step 2. Create a new TripleDESCryptoServiceProvider object
TripleDESCryptoServiceProvider TDESAlgorithm = new TripleDESCryptoServiceProvider();
// Step 3. Setup the encoder
TDESAlgorithm.Key = TDESByte;
TDESAlgorithm.Mode = CipherMode.ECB;
TDESAlgorithm.Padding = PaddingMode.PKCS7;
// Step 4. Convert the input string to a byte[]
byte[] dataToEncrypt = UTF8.GetBytes(stringToEncrypt);
// Step 5. Attempt to encrypt the string
try
{
ICryptoTransform Encryptor = TDESAlgorithm.CreateEncryptor();
sourceBytes = Encryptor.TransformFinalBlock(dataToEncrypt, 0, dataToEncrypt.Length);
}
finally
{
// Clear the TripleDes and Hashprovider services of any sensitive information
TDESAlgorithm.Clear();
mcsp.Clear();
}
// Step 6. Return the encrypted string as a base64 encoded string
return(Convert.ToBase64String(sourceBytes));
}
public static string AesDecryption(string base64StringToDecrypt, EncryptionKey encryptionKey)
{
using (AesCryptoServiceProvider acsp = GetProvider(Encoding.Default.GetBytes(encryptionKey.GetCustomDescription().MD5HexString())))
{
byte[] rawBytes = Convert.FromBase64String(base64StringToDecrypt);
ICryptoTransform ict = acsp.CreateDecryptor();
using (MemoryStream ms = new MemoryStream(rawBytes, 0, rawBytes.Length))
using (CryptoStream cs = new CryptoStream(ms, ict, CryptoStreamMode.Read))
return((new StreamReader(cs)).ReadToEnd());
}
}
public static string AesEncryption(string stringToEncrypt, EncryptionKey encryptionKey)
{
using (AesCryptoServiceProvider acsp = GetProvider(Encoding.Default.GetBytes(encryptionKey.GetCustomDescription().MD5HexString())))
{
byte[] sourceBytes = Encoding.ASCII.GetBytes(stringToEncrypt);
ICryptoTransform ict = acsp.CreateEncryptor();
using (MemoryStream ms = new MemoryStream())
using (CryptoStream cs = new CryptoStream(ms, ict, CryptoStreamMode.Write))
{
cs.Write(sourceBytes, 0, sourceBytes.Length);
cs.FlushFinalBlock();
byte[] encryptedBytes = ms.ToArray(); /***** .ToArray() is important, don't mess with the buffer *****/
return(Convert.ToBase64String(encryptedBytes));
}
}
}