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using System;
using System.Collections;
namespace Org.BouncyCastle.Crypto.Tls
{
public abstract class PskTlsClient
:TlsClient
{
protected TlsCipherFactory cipherFactory;
protected TlsPskIdentity pskIdentity;
protected TlsClientContext context;
protected byte selectedCompressionMethod;
protected int selectedCipherSuite;
public PskTlsClient(TlsPskIdentity pskIdentity)
: this(new DefaultTlsCipherFactory(), pskIdentity)
{
}
public PskTlsClient(TlsCipherFactory cipherFactory, TlsPskIdentity pskIdentity)
{
this.cipherFactory = cipherFactory;
this.pskIdentity = pskIdentity;
}
public virtual void Init(TlsClientContext context)
{
this.context = context;
}
public virtual bool ShouldUseGmtUnixTime()
{
/*
* draft-mathewson-no-gmtunixtime-00 2. For the reasons we discuss above, we recommend that
* TLS implementors MUST by default set the entire value the ClientHello.Random and
* ServerHello.Random fields, including gmt_unix_time, to a cryptographically random
* sequence.
*/
return false;
}
public virtual int[] GetCipherSuites()
{
return new int[] {
CipherSuite.TLS_DHE_PSK_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_DHE_PSK_WITH_AES_128_CBC_SHA,
CipherSuite.TLS_DHE_PSK_WITH_3DES_EDE_CBC_SHA,
CipherSuite.TLS_DHE_PSK_WITH_RC4_128_SHA,
CipherSuite.TLS_RSA_PSK_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_RSA_PSK_WITH_AES_128_CBC_SHA,
CipherSuite.TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA,
CipherSuite.TLS_RSA_PSK_WITH_RC4_128_SHA,
CipherSuite.TLS_PSK_WITH_AES_256_CBC_SHA,
CipherSuite.TLS_PSK_WITH_AES_128_CBC_SHA,
CipherSuite.TLS_PSK_WITH_3DES_EDE_CBC_SHA,
CipherSuite.TLS_PSK_WITH_RC4_128_SHA,
};
}
public virtual IDictionary GetClientExtensions()
{
return null;
}
public virtual byte[] GetCompressionMethods()
{
return new byte[] { CompressionMethod.NULL };
}
public virtual void NotifySessionID(byte[] sessionID)
{
// Currently ignored
}
public virtual void NotifySelectedCipherSuite(int selectedCipherSuite)
{
this.selectedCipherSuite = selectedCipherSuite;
}
public virtual void NotifySelectedCompressionMethod(byte selectedCompressionMethod)
{
this.selectedCompressionMethod = selectedCompressionMethod;
}
public virtual void NotifySecureRenegotiation(bool secureRenegotiation)
{
if (!secureRenegotiation)
{
/*
* RFC 5746 3.4. If the extension is not present, the server does not support
* secure renegotiation; set secure_renegotiation flag to FALSE. In this case,
* some clients may want to terminate the handshake instead of continuing; see
* Section 4.1 for discussion.
*/
// throw new TlsFatalAlert(AlertDescription.handshake_failure);
}
}
public virtual void ProcessServerExtensions(IDictionary serverExtensions)
{
}
public virtual TlsKeyExchange GetKeyExchange()
{
switch (selectedCipherSuite)
{
case CipherSuite.TLS_PSK_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_PSK_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_PSK_WITH_AES_256_CBC_SHA:
case CipherSuite.TLS_PSK_WITH_RC4_128_SHA:
return CreatePskKeyExchange(KeyExchangeAlgorithm.PSK);
case CipherSuite.TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_RSA_PSK_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_RSA_PSK_WITH_AES_256_CBC_SHA:
case CipherSuite.TLS_RSA_PSK_WITH_RC4_128_SHA:
return CreatePskKeyExchange(KeyExchangeAlgorithm.RSA_PSK);
case CipherSuite.TLS_DHE_PSK_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_DHE_PSK_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_DHE_PSK_WITH_AES_256_CBC_SHA:
case CipherSuite.TLS_DHE_PSK_WITH_RC4_128_SHA:
return CreatePskKeyExchange(KeyExchangeAlgorithm.DHE_PSK);
default:
/*
* Note: internal error here; the TlsProtocolHandler verifies that the
* server-selected cipher suite was in the list of client-offered cipher
* suites, so if we now can't produce an implementation, we shouldn't have
* offered it!
*/
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
public abstract TlsAuthentication GetAuthentication();
public virtual TlsCompression GetCompression()
{
switch (selectedCompressionMethod)
{
case CompressionMethod.NULL:
return new TlsNullCompression();
default:
/*
* Note: internal error here; the TlsProtocolHandler verifies that the
* server-selected compression method was in the list of client-offered compression
* methods, so if we now can't produce an implementation, we shouldn't have
* offered it!
*/
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
public virtual TlsCipher GetCipher()
{
switch (selectedCipherSuite)
{
case CipherSuite.TLS_PSK_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_RSA_PSK_WITH_3DES_EDE_CBC_SHA:
case CipherSuite.TLS_DHE_PSK_WITH_3DES_EDE_CBC_SHA:
return cipherFactory.CreateCipher(context, EncryptionAlgorithm.cls_3DES_EDE_CBC,
MacAlgorithm.hmac_sha1);
case CipherSuite.TLS_PSK_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_RSA_PSK_WITH_AES_128_CBC_SHA:
case CipherSuite.TLS_DHE_PSK_WITH_AES_128_CBC_SHA:
return cipherFactory.CreateCipher(context, EncryptionAlgorithm.AES_128_CBC,
MacAlgorithm.hmac_sha1);
case CipherSuite.TLS_PSK_WITH_AES_256_CBC_SHA:
case CipherSuite.TLS_RSA_PSK_WITH_AES_256_CBC_SHA:
case CipherSuite.TLS_DHE_PSK_WITH_AES_256_CBC_SHA:
return cipherFactory.CreateCipher(context, EncryptionAlgorithm.AES_256_CBC,
MacAlgorithm.hmac_sha1);
case CipherSuite.TLS_PSK_WITH_RC4_128_SHA:
case CipherSuite.TLS_RSA_PSK_WITH_RC4_128_SHA:
case CipherSuite.TLS_DHE_PSK_WITH_RC4_128_SHA:
return cipherFactory.CreateCipher(context, EncryptionAlgorithm.RC4_128,
MacAlgorithm.hmac_sha1);
default:
/*
* Note: internal error here; the TlsProtocolHandler verifies that the
* server-selected cipher suite was in the list of client-offered cipher
* suites, so if we now can't produce an implementation, we shouldn't have
* offered it!
*/
throw new TlsFatalAlert(AlertDescription.internal_error);
}
}
protected virtual TlsKeyExchange CreatePskKeyExchange(int keyExchange)
{
return new TlsPskKeyExchange(context, keyExchange, pskIdentity);
}
}
}
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