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using System;
using System.Collections;
using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Tls
{
public sealed class OfferedPsks
{
private readonly IList m_identities;
private readonly IList m_binders;
public OfferedPsks(IList identities, IList binders)
{
if (null == identities || identities.Count < 1)
throw new ArgumentException("cannot be null or empty", "identities");
if (null == binders || identities.Count != binders.Count)
throw new ArgumentException("must be non-null and the same length as 'identities'", "binders");
this.m_identities = identities;
this.m_binders = binders;
}
public IList Binders
{
get { return m_binders; }
}
public IList Identities
{
get { return m_identities; }
}
/// <exception cref="IOException"/>
public void Encode(Stream output)
{
// identities
{
int totalLengthIdentities = 0;
foreach (PskIdentity identity in m_identities)
{
totalLengthIdentities += 2 + identity.Identity.Length + 4;
}
TlsUtilities.CheckUint16(totalLengthIdentities);
TlsUtilities.WriteUint16(totalLengthIdentities, output);
foreach (PskIdentity identity in m_identities)
{
identity.Encode(output);
}
}
// binders
{
int totalLengthBinders = 0;
foreach (byte[] binder in m_binders)
{
totalLengthBinders += 1 + binder.Length;
}
TlsUtilities.CheckUint16(totalLengthBinders);
TlsUtilities.WriteUint16(totalLengthBinders, output);
foreach (byte[] binder in m_binders)
{
TlsUtilities.WriteOpaque8(binder, output);
}
}
}
/// <exception cref="IOException"/>
public static OfferedPsks Parse(Stream input)
{
IList identities = Platform.CreateArrayList();
{
int totalLengthIdentities = TlsUtilities.ReadUint16(input);
if (totalLengthIdentities < 7)
throw new TlsFatalAlert(AlertDescription.decode_error);
byte[] identitiesData = TlsUtilities.ReadFully(totalLengthIdentities, input);
MemoryStream buf = new MemoryStream(identitiesData, false);
do
{
PskIdentity identity = PskIdentity.Parse(buf);
identities.Add(identity);
}
while (buf.Position < buf.Length);
}
IList binders = Platform.CreateArrayList();
{
int totalLengthBinders = TlsUtilities.ReadUint16(input);
if (totalLengthBinders < 33)
throw new TlsFatalAlert(AlertDescription.decode_error);
byte[] bindersData = TlsUtilities.ReadFully(totalLengthBinders, input);
MemoryStream buf = new MemoryStream(bindersData, false);
do
{
byte[] binder = TlsUtilities.ReadOpaque8(input, 32);
binders.Add(binder);
}
while (buf.Position < buf.Length);
}
return new OfferedPsks(identities, binders);
}
}
}
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