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using System;
using System.IO;
using Org.BouncyCastle.Tls.Crypto;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Tls
{
public class TlsDheKeyExchange
: AbstractTlsKeyExchange
{
private static int CheckKeyExchange(int keyExchange)
{
switch (keyExchange)
{
case KeyExchangeAlgorithm.DHE_DSS:
case KeyExchangeAlgorithm.DHE_RSA:
return keyExchange;
default:
throw new ArgumentException("unsupported key exchange algorithm", "keyExchange");
}
}
protected TlsDHGroupVerifier m_dhGroupVerifier;
protected TlsDHConfig m_dhConfig;
protected TlsCredentialedSigner m_serverCredentials = null;
protected TlsCertificate m_serverCertificate = null;
protected TlsAgreement m_agreement;
public TlsDheKeyExchange(int keyExchange, TlsDHGroupVerifier dhGroupVerifier)
: this(keyExchange, dhGroupVerifier, null)
{
}
public TlsDheKeyExchange(int keyExchange, TlsDHConfig dhConfig)
: this(keyExchange, null, dhConfig)
{
}
private TlsDheKeyExchange(int keyExchange, TlsDHGroupVerifier dhGroupVerifier, TlsDHConfig dhConfig)
: base(CheckKeyExchange(keyExchange))
{
this.m_dhGroupVerifier = dhGroupVerifier;
this.m_dhConfig = dhConfig;
}
public override void SkipServerCredentials()
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
public override void ProcessServerCredentials(TlsCredentials serverCredentials)
{
this.m_serverCredentials = TlsUtilities.RequireSignerCredentials(serverCredentials);
}
public override void ProcessServerCertificate(Certificate serverCertificate)
{
this.m_serverCertificate = serverCertificate.GetCertificateAt(0);
}
public override bool RequiresServerKeyExchange
{
get { return true; }
}
public override byte[] GenerateServerKeyExchange()
{
DigestInputBuffer digestBuffer = new DigestInputBuffer();
TlsDHUtilities.WriteDHConfig(m_dhConfig, digestBuffer);
this.m_agreement = m_context.Crypto.CreateDHDomain(m_dhConfig).CreateDH();
byte[] y = m_agreement.GenerateEphemeral();
TlsUtilities.WriteOpaque16(y, digestBuffer);
TlsUtilities.GenerateServerKeyExchangeSignature(m_context, m_serverCredentials, null, digestBuffer);
return digestBuffer.ToArray();
}
public override void ProcessServerKeyExchange(Stream input)
{
DigestInputBuffer digestBuffer = new DigestInputBuffer();
Stream teeIn = new TeeInputStream(input, digestBuffer);
this.m_dhConfig = TlsDHUtilities.ReceiveDHConfig(m_context, m_dhGroupVerifier, teeIn);
byte[] y = TlsUtilities.ReadOpaque16(teeIn, 1);
TlsUtilities.VerifyServerKeyExchangeSignature(m_context, input, m_serverCertificate, null, digestBuffer);
this.m_agreement = m_context.Crypto.CreateDHDomain(m_dhConfig).CreateDH();
m_agreement.ReceivePeerValue(y);
}
public override short[] GetClientCertificateTypes()
{
return new short[]{ ClientCertificateType.dss_sign, ClientCertificateType.ecdsa_sign,
ClientCertificateType.rsa_sign };
}
public override void ProcessClientCredentials(TlsCredentials clientCredentials)
{
TlsUtilities.RequireSignerCredentials(clientCredentials);
}
public override void GenerateClientKeyExchange(Stream output)
{
byte[] y = m_agreement.GenerateEphemeral();
TlsUtilities.WriteOpaque16(y, output);
}
public override void ProcessClientKeyExchange(Stream input)
{
m_agreement.ReceivePeerValue(TlsUtilities.ReadOpaque16(input, 1));
}
public override TlsSecret GeneratePreMasterSecret()
{
return m_agreement.CalculateSecret();
}
}
}
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