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using System;
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
using System.Buffers;
#endif
namespace Org.BouncyCastle.Crypto.Parameters
{
public class ParametersWithIV
: ICipherParameters
{
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public static ParametersWithIV Create<TState>(ICipherParameters parameter, int ivLength, TState state,
SpanAction<byte, TState> action)
{
if (action == null)
throw new ArgumentNullException(nameof(action));
if (ivLength < 0)
throw new ArgumentOutOfRangeException(nameof(ivLength));
ParametersWithIV result = new ParametersWithIV(parameter, ivLength);
action(result.m_iv, state);
return result;
}
#endif
internal static ICipherParameters ApplyOptionalIV(ICipherParameters parameters, byte[] iv)
{
return iv == null ? parameters : new ParametersWithIV(parameters, iv);
}
private readonly ICipherParameters m_parameters;
private readonly byte[] m_iv;
public ParametersWithIV(ICipherParameters parameters, byte[] iv)
: this(parameters, iv, 0, iv.Length)
{
// NOTE: 'parameters' may be null to imply key re-use
if (iv == null)
throw new ArgumentNullException(nameof(iv));
m_parameters = parameters;
m_iv = (byte[])iv.Clone();
}
public ParametersWithIV(ICipherParameters parameters, byte[] iv, int ivOff, int ivLen)
{
// NOTE: 'parameters' may be null to imply key re-use
if (iv == null)
throw new ArgumentNullException(nameof(iv));
m_parameters = parameters;
m_iv = new byte[ivLen];
Array.Copy(iv, ivOff, m_iv, 0, ivLen);
}
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
public ParametersWithIV(ICipherParameters parameters, ReadOnlySpan<byte> iv)
{
// NOTE: 'parameters' may be null to imply key re-use
m_parameters = parameters;
m_iv = iv.ToArray();
}
#endif
private ParametersWithIV(ICipherParameters parameters, int ivLength)
{
if (ivLength < 0)
throw new ArgumentOutOfRangeException(nameof(ivLength));
// NOTE: 'parameters' may be null to imply key re-use
m_parameters = parameters;
m_iv = new byte[ivLength];
}
public byte[] GetIV()
{
return (byte[])m_iv.Clone();
}
public int IVLength => m_iv.Length;
public ICipherParameters Parameters => m_parameters;
#if NETCOREAPP2_1_OR_GREATER || NETSTANDARD2_1_OR_GREATER
internal ReadOnlySpan<byte> IV => m_iv;
#endif
}
}
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