/// <summary>
/// Gets the platform enum value for the padding used by the specified algorithm.
/// </summary>
/// <param name="algorithm">The algorithm.</param>
/// <returns>The platform-specific enum value for the padding.</returns>
private static Platform.PaddingMode GetPadding(SymmetricAlgorithm algorithm)
{
switch (algorithm.GetPadding())
{
case SymmetricAlgorithmPadding.None:
return(Platform.PaddingMode.None);
case SymmetricAlgorithmPadding.PKCS7:
return(Platform.PaddingMode.PKCS7);
default:
throw new ArgumentException();
}
}
/// <summary>
/// Gets the padding substring to include in the string
/// passed to <see cref="Cipher.GetInstance(string)"/>
/// </summary>
/// <param name="algorithm">The algorithm.</param>
/// <returns>A value such as "PKCS7Padding", or <c>null</c> if no padding.</returns>
private static string GetPadding(SymmetricAlgorithm algorithm)
{
switch (algorithm.GetPadding())
{
case SymmetricAlgorithmPadding.None:
return(null);
case SymmetricAlgorithmPadding.PKCS7:
return("PKCS7Padding");
default:
throw new NotSupportedException();
}
}
/// <summary>
/// Gets the padding substring to include in the string
/// passed to <see cref="Cipher.GetInstance(string)"/>
/// </summary>
/// <param name="algorithm">The algorithm.</param>
/// <returns>A value such as "PKCS7Padding", or <c>null</c> if no padding.</returns>
private static string GetPadding(SymmetricAlgorithm algorithm)
{
switch (algorithm.GetPadding())
{
case SymmetricAlgorithmPadding.None:
return null;
case SymmetricAlgorithmPadding.PKCS7:
return "PKCS7Padding";
default:
throw new NotSupportedException();
}
}
/// <summary>Returns a crypto key management for a specified algorithm.</summary>
/// <param name="factory">The factory.</param>
/// <param name="algorithm">The algorithm.</param>
/// <returns>An instance of <see cref="ISymmetricKeyAlgorithmProvider"/>.</returns>
public static ISymmetricKeyAlgorithmProvider OpenAlgorithm(this ISymmetricKeyAlgorithmProviderFactory factory, SymmetricAlgorithm algorithm)
{
Requires.NotNull(factory, nameof(factory));
return(factory.OpenAlgorithm(algorithm.GetName(), algorithm.GetMode(), algorithm.GetPadding()));
}
/// <summary>
/// Returns a crypto key management for a specified algorithm.
/// </summary>
/// <param name="factory">The factory.</param>
/// <param name="algorithm">The algorithm.</param>
/// <returns>An instance of <see cref="ISymmetricKeyAlgorithmProvider"/>.</returns>
public static ISymmetricKeyAlgorithmProvider OpenAlgorithm(this ISymmetricKeyAlgorithmProviderFactory factory, SymmetricAlgorithm algorithm)
{
Requires.NotNull(factory, nameof(factory));
return factory.OpenAlgorithm(algorithm.GetName(), algorithm.GetMode(), algorithm.GetPadding());
}