/// <summary>
/// Gets the first protected setting value.
/// </summary>
/// <param name="settingService"> The setting service. </param>
/// <param name="safeName"> The name of the protected values. </param>
/// <param name="userScope">
/// Specifies whether the values should be readable by all users on a machine (false) or only by
/// the user protecting them (true).
/// </param>
/// <param name="additionalEntropy"> Additional custom strings which increase the entropy of the encrypted value. </param>
/// <returns>
/// The setting value or null if the setting is not available.
/// </returns>
/// <exception cref="ArgumentNullException"> <paramref name="settingService" /> or <paramref name="safeName" /> is null. </exception>
/// <exception cref="ArgumentException"> <paramref name="safeName" /> is an empty string. </exception>
/// <exception cref="CryptographicException">
/// The value could not be decrypted. This may be cause when trying to decrypt a
/// value which belongs to another user.
/// </exception>
public static string GetProtectedValue(this ISettingService settingService, string safeName, bool userScope,
params string[] additionalEntropy)
{
if (settingService == null)
{
throw new ArgumentNullException(nameof(settingService));
}
if (safeName == null)
{
throw new ArgumentNullException(nameof(safeName));
}
if (string.IsNullOrWhiteSpace(safeName))
{
throw new ArgumentException("The string is empty.", nameof(safeName));
}
string safeValue = settingService.GetValue <string>(safeName);
if (safeValue == null)
{
return(null);
}
string finalAdditionalEntropy =
SettingItemExtensions.BuildAdditionalEntropy(safeName, userScope, additionalEntropy);
string unsafeValue = LocalEncryption.Decrypt(userScope, safeValue, finalAdditionalEntropy);
return(unsafeValue);
}
/// <summary>
/// Gets all protected setting values.
/// </summary>
/// <param name="settingService"> The setting service. </param>
/// <param name="safeName"> The name of the protected values. </param>
/// <param name="userScope">
/// Specifies whether the values should be readable by all users on a machine (false) or only by
/// the user protecting them (true).
/// </param>
/// <param name="additionalEntropy"> Additional custom strings which increase the entropy of the encrypted value. </param>
/// <returns>
/// The setting values or an empty list if the setting is not available.
/// </returns>
/// <exception cref="ArgumentNullException"> <paramref name="settingService" /> or <paramref name="safeName" /> is null. </exception>
/// <exception cref="ArgumentException"> <paramref name="safeName" /> is an empty string. </exception>
/// <exception cref="CryptographicException">
/// The value could not be decrypted. This may be cause when trying to decrypt a
/// value which belongs to another user.
/// </exception>
public static List <string> GetProtectedValues(this ISettingService settingService, string safeName,
bool userScope, params string[] additionalEntropy)
{
if (settingService == null)
{
throw new ArgumentNullException(nameof(settingService));
}
if (safeName == null)
{
throw new ArgumentNullException(nameof(safeName));
}
if (string.IsNullOrWhiteSpace(safeName))
{
throw new ArgumentException("The string is empty.", nameof(safeName));
}
List <string> safeValues = settingService.GetValues <string>(safeName);
string finalAdditionalEntropy =
SettingItemExtensions.BuildAdditionalEntropy(safeName, userScope, additionalEntropy);
List <string> unsafeValues = (from x in safeValues
select LocalEncryption.Decrypt(userScope, x, finalAdditionalEntropy)).ToList();
return(unsafeValues);
}
/// <summary>
/// Protects values by encrypting them and storing under a separate name, deleting the unprotected values.
/// </summary>
/// <param name="settingService"> The setting service. </param>
/// <param name="safeName"> The name of the protected values. </param>
/// <param name="unsafeName"> The name of the unprotected values. </param>
/// <param name="userScope">
/// Specifies whether the values should be readable by all users on a machine (false) or only by
/// the user protecting them (true).
/// </param>
/// <param name="additionalEntropy"> Additional custom strings which increase the entropy of the encrypted value. </param>
/// <exception cref="ArgumentNullException">
/// <paramref name="settingService" />, <paramref name="safeName" />, or
/// <paramref name="unsafeName" /> is null.
/// </exception>
/// <exception cref="ArgumentException"> <paramref name="safeName" /> or <paramref name="unsafeName" /> is an empty string. </exception>
public static void ProtectValues(this ISettingService settingService, string safeName, string unsafeName,
bool userScope, params string[] additionalEntropy)
{
if (settingService == null)
{
throw new ArgumentNullException(nameof(settingService));
}
if (safeName == null)
{
throw new ArgumentNullException(nameof(safeName));
}
if (string.IsNullOrWhiteSpace(safeName))
{
throw new ArgumentException("The string is empty.", nameof(safeName));
}
if (unsafeName == null)
{
throw new ArgumentNullException(nameof(unsafeName));
}
if (string.IsNullOrWhiteSpace(unsafeName))
{
throw new ArgumentException("The string is empty.", nameof(unsafeName));
}
string finalAdditionalEntropy =
SettingItemExtensions.BuildAdditionalEntropy(safeName, userScope, additionalEntropy);
List <string> unsafeValues = settingService.GetValues <string>(unsafeName);
List <string> safeValues = settingService.GetValues <string>(safeName);
safeValues.AddRange(from x in unsafeValues
select LocalEncryption.Encrypt(userScope, x, finalAdditionalEntropy));
settingService.SetValues(safeName, safeValues);
settingService.DeleteValues(unsafeName);
unsafeValues.Clear();
safeValues.Clear();
}