ParametersWithContext
using System;
using System.Buffers;
namespace Org.BouncyCastle.Crypto.Parameters
{
public class ParametersWithContext : ICipherParameters
{
private readonly ICipherParameters m_parameters;
private readonly byte[] m_context;
public int ContextLength => m_context.Length;
public ICipherParameters Parameters => m_parameters;
internal ReadOnlySpan<byte> Context => m_context;
public static ParametersWithContext Create<TState>(ICipherParameters parameters, int contextLength, TState state, SpanAction<byte, TState> action)
{
if (action == null)
throw new ArgumentNullException("action");
if (contextLength < 0)
throw new ArgumentOutOfRangeException("contextLength");
ParametersWithContext parametersWithContext = new ParametersWithContext(parameters, contextLength);
action(parametersWithContext.m_context, state);
return parametersWithContext;
}
internal static ICipherParameters ApplyOptionalContext(ICipherParameters parameters, byte[] context)
{
if (context != null)
return new ParametersWithContext(parameters, context);
return parameters;
}
public ParametersWithContext(ICipherParameters parameters, byte[] context)
{
if (context == null)
throw new ArgumentNullException("context");
m_parameters = parameters;
m_context = (byte[])context.Clone();
}
public ParametersWithContext(ICipherParameters parameters, byte[] context, int contextOff, int contextLen)
{
if (context == null)
throw new ArgumentNullException("context");
m_parameters = parameters;
m_context = new byte[contextLen];
Array.Copy(context, contextOff, m_context, 0, contextLen);
}
public ParametersWithContext(ICipherParameters parameters, ReadOnlySpan<byte> context)
{
m_parameters = parameters;
m_context = context.ToArray();
}
private ParametersWithContext(ICipherParameters parameters, int contextLength)
{
if (contextLength < 0)
throw new ArgumentOutOfRangeException("contextLength");
m_parameters = parameters;
m_context = new byte[contextLength];
}
public void CopyContextTo(byte[] buf, int off, int len)
{
if (m_context.Length != len)
throw new ArgumentOutOfRangeException("len");
Array.Copy(m_context, 0, buf, off, len);
}
public byte[] GetContext()
{
return (byte[])m_context.Clone();
}
}
}