/// <summary>
/// Decrypts the data of the IEncryptable with the key and sets the IV for future decryption
/// </summary>
/// <param name="keyMaterial">The AES encryption key</param>
/// <param name="encryptable">The object to be decrypted, containing encrypted data (ciphertext)</param>
/// <returns>The object with decrypted data (plaintext)</returns>
private static IEncryptable DecryptData(byte[] keyMaterial, IEncryptable encryptable)
{
var provider = WinRTCrypto.SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithm.AesCbcPkcs7);
var key = provider.CreateSymmetricKey(keyMaterial);
var plainText = WinRTCrypto.CryptographicEngine.Decrypt(key, encryptable.GetData(), encryptable.GetIV());
encryptable.SetData(plainText);
return(encryptable);
}
/// <summary>
/// Encrypts the data of the IEncryptable with the key and sets the IV for future decryption
/// </summary>
/// <param name="keyMaterial">The AES encryption key</param>
/// <param name="encryptable">The object to be encrypted, containing not encrypted data (plaintext)</param>
/// <returns>The object with encrypted data (ciphertext)</returns>
private static IEncryptable EncryptData(byte[] keyMaterial, IEncryptable encryptable)
{
var provider = WinRTCrypto.SymmetricKeyAlgorithmProvider.OpenAlgorithm(SymmetricAlgorithm.AesCbcPkcs7);
var key = provider.CreateSymmetricKey(keyMaterial);
var iv = WinRTCrypto.CryptographicBuffer.GenerateRandom(provider.BlockLength);
var cipherText = WinRTCrypto.CryptographicEngine.Encrypt(key, encryptable.GetData(), iv);
encryptable.SetData(cipherText);
encryptable.SetIV(iv);
return(encryptable);
}