} // End Function Encrypt
public string DeCrypt(string encryptedInput)
{
string returnValue = null;
if (string.IsNullOrEmpty(encryptedInput))
{
throw new System.ArgumentNullException("encryptedInput", "encryptedInput may not be string.Empty or NULL, because these are invid values.");
}
using (System.Security.Cryptography.Aes objRijndael = System.Security.Cryptography.Aes.Create())
{
byte[] baCipherTextBuffer = HexStringToByteArray(encryptedInput);
byte[] baDecryptionKey = HexStringToByteArray(this.m_key);
byte[] baInitializationVector = HexStringToByteArray(this.m_iv);
// This is where the message would be transmitted to a recipient
// who already knows your secret key. Optionally, you can
// also encrypt your secret key using a public key algorithm
// and pass it to the mesage recipient along with the RijnDael
// encrypted message.
//Get a decryptor that uses the same key and IV as the encryptor.
using (System.Security.Cryptography.ICryptoTransform transform = objRijndael.CreateDecryptor(baDecryptionKey, baInitializationVector))
{
//Now decrypt the previously encrypted message using the decryptor
// obtained in the above step.
using (System.IO.MemoryStream msDecrypt = new System.IO.MemoryStream(baCipherTextBuffer))
{
using (System.Security.Cryptography.CryptoStream csDecrypt =
new System.Security.Cryptography.CryptoStream(
msDecrypt
, transform
, System.Security.Cryptography.CryptoStreamMode.Read)
)
{
byte[] baPlainTextBuffer = new byte[baCipherTextBuffer.Length];
//Read the data out of the crypto stream.
csDecrypt.Read(baPlainTextBuffer, 0, baPlainTextBuffer.Length);
//Convert the byte array back into a string.
returnValue = this.m_encoding.GetString(baPlainTextBuffer);
System.Array.Clear(baPlainTextBuffer, 0, baPlainTextBuffer.Length);
baPlainTextBuffer = null;
if (!string.IsNullOrEmpty(returnValue))
{
returnValue = returnValue.Trim('\0');
}
csDecrypt.Clear();
} // End Using csDecrypt
} // End Using msDecrypt
} // End Using transform
} // End Using aes
return(returnValue);
} // End Function DeCrypt
} // End Function GenerateKey
public string Encrypt(string plainText)
{
string retValue = null;
using (System.Security.Cryptography.Aes aes = System.Security.Cryptography.Aes.Create())
{
byte[] baCipherTextBuffer = null;
byte[] baPlainTextBuffer = null;
byte[] baEncryptionKey = HexStringToByteArray(this.m_key);
byte[] baInitializationVector = HexStringToByteArray(this.m_iv);
aes.Key = baEncryptionKey;
aes.IV = baInitializationVector;
//Get an encryptor.
using (System.Security.Cryptography.ICryptoTransform transform =
aes.CreateEncryptor(baEncryptionKey, baInitializationVector))
{
//Encrypt the data.
using (System.IO.MemoryStream msEncrypt = new System.IO.MemoryStream())
{
using (System.Security.Cryptography.CryptoStream csEncrypt =
new System.Security.Cryptography.CryptoStream(
msEncrypt
, transform
, System.Security.Cryptography.CryptoStreamMode.Write
)
)
{
//Convert the data to a byte array.
baPlainTextBuffer = this.m_encoding.GetBytes(plainText);
//Write all data to the crypto stream and flush it.
csEncrypt.Write(baPlainTextBuffer, 0, baPlainTextBuffer.Length);
csEncrypt.FlushFinalBlock();
//Get encrypted array of bytes.
baCipherTextBuffer = msEncrypt.ToArray();
csEncrypt.Clear();
} // End Using csEncrypt
} // End Using msEncrypt
} // End Using transform
retValue = ByteArrayToHexString(baCipherTextBuffer);
System.Array.Clear(baCipherTextBuffer, 0, baCipherTextBuffer.Length);
System.Array.Clear(baPlainTextBuffer, 0, baPlainTextBuffer.Length);
System.Array.Clear(baEncryptionKey, 0, baEncryptionKey.Length);
System.Array.Clear(baInitializationVector, 0, baInitializationVector.Length);
baCipherTextBuffer = null;
baPlainTextBuffer = null;
baEncryptionKey = null;
baInitializationVector = null;
} // End Using aes
return(retValue);
} // End Function Encrypt
