/// <summary>
/// Decrypts cipherText value with IV and text and returns decrypted string
/// </summary>
public string Decrypt(byte[] cipherText, byte[] iv, long ticks)
{
try
{
string plaintext = null;
// Create AesManaged
if (singleKeyManager)
{
throw new InvalidOperationException("This instance of EncryptionManager was not expecting parameter of ticks. Use constructor with a, b and c instead.");
}
if (AESManager == null)
{
AESManager = new AesManaged();
}
Random random;
if (ticks % 2 == 0)
{
random = new Random(BaseEvenIntKey + (int)(ticks % 1000000000));
}
else
{
random = new Random(BaseOddIntKey + (int)(ticks % 1000000000));
}
byte[] bytes = new byte[32];
random.NextBytes(bytes);
AESManager.Key = bytes;
// Create a decryptor
ICryptoTransform decryptor = AESManager.CreateDecryptor(AESManager.Key, iv);
// Create the streams used for decryption.
using (MemoryStream ms = new MemoryStream(cipherText))
{
// Create crypto stream
using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
{
// Read crypto stream
using (StreamReader reader = new StreamReader(cs))
{
plaintext = reader.ReadToEnd();
}
}
}
return(plaintext);
}
catch (Exception ex)
{
Debug.WriteLine(ex);
throw ex;
}
}
/// <summary>
/// Decrypts cipherText value with IV and returns decrypted string
/// </summary>
public string Decrypt(byte[] cipherText, byte[] iv)
{
try
{
string plaintext = null;
// Create AesManaged
if (!singleKeyManager)
{
throw new InvalidOperationException("This instance of EncryptionManager was expecting parameter of ticks.");
}
if (AESManager == null)
{
AESManager = new AesManaged();
}
// Create a decryptor
ICryptoTransform decryptor = AESManager.CreateDecryptor(AESManager.Key, iv);
// Create the streams used for decryption.
using (MemoryStream ms = new MemoryStream(cipherText))
{
// Create crypto stream
using (CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read))
{
// Read crypto stream
using (StreamReader reader = new StreamReader(cs))
{
plaintext = reader.ReadToEnd();
}
}
}
return(plaintext);
}
catch (Exception ex)
{
Debug.WriteLine(ex);
throw ex;
}
}
