//public static BinaryKeyVectorPair GetEncryptionKeyAndInitializationVector()
//{
// System.Configuration.Configuration c = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.PerUserRoaming);
// EncryptionConfiguration conf = null;
// if (c != null)
// {
// conf = (EncryptionConfiguration)
// c.GetSection(
// EncryptionConfigurationConstants.SECTION_NAME);
// }
// conf = CheckConfiguration(conf);
// ICryptoTransform encryptor = null;
// BinaryKeyVectorPair kvpair = GetValidKeyVectorPair(conf);
//}
public static BinaryKeyVectorPair GetValidKeyVectorPair(byte[] key, byte[] vector, EncryptionAlgorithm algorithm)
{
BinaryKeyVectorPair pair = new BinaryKeyVectorPair();
switch (algorithm)
{
case EncryptionAlgorithm.DES:
//key is 8 bytes
DESCryptoServiceProvider prov = new DESCryptoServiceProvider();
pair.Key = LimitBytes(key, prov.LegalKeySizes);
pair.Vector = LimitBytes(vector, prov.LegalBlockSizes);
break;
case EncryptionAlgorithm.TripleDES:
TripleDESCryptoServiceProvider prov1 = new TripleDESCryptoServiceProvider();
pair.Key = LimitBytes(key, prov1.LegalKeySizes);
pair.Vector = LimitBytes(vector, prov1.LegalBlockSizes);
break;
case EncryptionAlgorithm.RC2:
RC2CryptoServiceProvider prov2 = new RC2CryptoServiceProvider();
pair.Key = LimitBytes(key, prov2.LegalKeySizes);
pair.Vector = LimitBytes(vector, prov2.LegalBlockSizes);
break;
case EncryptionAlgorithm.Rijndael:
RijndaelManaged prov3 = new RijndaelManaged();
pair.Key = LimitBytes(key, prov3.LegalKeySizes);
pair.Vector = LimitBytes(vector, prov3.LegalBlockSizes);
break;
}
//shouldn't get here
return(pair);
}
public static ICryptoTransform GetEncryptorOrDecryptor(EncryptionAlgorithm algorithm, byte[] encryptionKey, byte[] initializationVector, bool encr)
{
BinaryKeyVectorPair kvp = GetValidKeyVectorPair(encryptionKey, initializationVector, algorithm);
switch (algorithm)
{
case EncryptionAlgorithm.DES:
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
//DES Keys are 8 bytes long only
if (encr)
{
return(des.CreateEncryptor(kvp.Key, kvp.Vector));
}
else
{
return(des.CreateDecryptor(kvp.Key, kvp.Vector));
}
case EncryptionAlgorithm.RC2:
RC2CryptoServiceProvider rc2 = new RC2CryptoServiceProvider();
if (encr)
{
return(rc2.CreateEncryptor(kvp.Key, kvp.Vector));
}
else
{
return(rc2.CreateDecryptor(kvp.Key, kvp.Vector));
}
case EncryptionAlgorithm.TripleDES:
TripleDESCryptoServiceProvider trid = new TripleDESCryptoServiceProvider();
//3DES keys are 24 bytes long only
if (encr)
{
return(trid.CreateEncryptor(kvp.Key, kvp.Vector));
}
else
{
return(trid.CreateDecryptor(kvp.Key, kvp.Vector));
}
case EncryptionAlgorithm.Rijndael:
RijndaelManaged rm = new RijndaelManaged();
if (encr)
{
return(rm.CreateEncryptor(kvp.Key, kvp.Vector));
}
else
{
return(rm.CreateDecryptor(kvp.Key, kvp.Vector));
}
}
return(null);
}
