/// <summary>
/// Decrypt the encryptedTuple.
/// </summary>
/// <param name="context">Your Android Context, likely your Activity or Service</param>
/// <param name="alias">Alias is the name you are using for the key, use sensible name</param>
/// <param name="encryptedTuple">Encrypted tuple.</param>
public static string Decrypt(Context context, string alias, EncryptedTuple encryptedTuple)
{
var confidentialKeyWrapper = new SecretKeyWrapper(context, alias);
var secretKeys = confidentialKeyWrapper.CheckMacAndDecrypt(encryptedTuple.EncryptedSymmetricKey);
return(AesCbcWithIntegrity.DecryptString(new AesCbcWithIntegrity.CipherTextIvMac(encryptedTuple.EncryptedText), secretKeys));
}
/// <summary>
/// Encrypt the specified clearText.
/// </summary>
/// <param name="context">Your Android Context, likely your Activity or Service</param>
/// <param name="alias">Alias is the name you are using for the key, use sensible name</param>
/// <param name="clearText">The content you want to encrypt</param>
public static EncryptedTuple Encrypt(Context context, string alias, string clearText)
{
var secretKeys = AesCbcWithIntegrity.GenerateKey();
var confidentialKeyWrapper = new SecretKeyWrapper(context, alias);
var encryptedSymmetricKey = confidentialKeyWrapper.EncryptedThenMac(secretKeys);
var encryptedBundle = AesCbcWithIntegrity.Encrypt(Encoding.UTF8.GetBytes(clearText), secretKeys);
return(new EncryptedTuple(encryptedBundle.ToString(), encryptedSymmetricKey));
}
