// wraps the supplied input key data using the provided symmetric algorithm
public static byte[] EncryptKey(byte[] keyData, KeyParameter symmetricAlgorithm)
{
if (keyData == null)
{
throw new ArgumentNullException(nameof(keyData));
}
if (symmetricAlgorithm == null)
{
throw new ArgumentNullException(nameof(symmetricAlgorithm));
}
if (symmetricAlgorithm is DesParameters)
{
// CMS Triple DES Key Wrap
return(SymmetricKeyWrap.TripleDESKeyWrapEncrypt(symmetricAlgorithm.GetKey(), keyData));
}
else
{
// FIPS AES Key Wrap
return(SymmetricKeyWrap.AESKeyWrapEncrypt(symmetricAlgorithm.GetKey(), keyData));
}
}
// decrypts the supplied wrapped key using the provided symmetric algorithm
public static byte[] DecryptKey(byte[] keyData, SymmetricAlgorithm symmetricAlgorithm)
{
if (keyData == null)
{
throw new ArgumentNullException("keyData");
}
if (symmetricAlgorithm == null)
{
throw new ArgumentNullException("symmetricAlgorithm");
}
if (symmetricAlgorithm is TripleDES)
{
// CMS Triple DES Key Wrap
return(SymmetricKeyWrap.TripleDESKeyWrapDecrypt(symmetricAlgorithm.Key, keyData));
}
else if (symmetricAlgorithm is Rijndael || symmetricAlgorithm is Aes)
{
// FIPS AES Key Wrap
return(SymmetricKeyWrap.AESKeyWrapDecrypt(symmetricAlgorithm.Key, keyData));
}
// throw an exception if the transform is not in the previous categories
throw new System.Security.Cryptography.CryptographicException(SR.Cryptography_Xml_NotSupportedCryptographicTransform);
}