protected virtual byte[] GenerateOtherSecret(int pskLength)
{
if (this.mKeyExchange == KeyExchangeAlgorithm.DHE_PSK)
{
if (mDHAgreePrivateKey != null)
{
return(TlsDHUtilities.CalculateDHBasicAgreement(mDHAgreePublicKey, mDHAgreePrivateKey));
}
throw new TlsFatalAlert(AlertDescription.internal_error);
}
if (this.mKeyExchange == KeyExchangeAlgorithm.ECDHE_PSK)
{
if (mECAgreePrivateKey != null)
{
return(TlsEccUtilities.CalculateECDHBasicAgreement(mECAgreePublicKey, mECAgreePrivateKey));
}
throw new TlsFatalAlert(AlertDescription.internal_error);
}
if (this.mKeyExchange == KeyExchangeAlgorithm.RSA_PSK)
{
return(this.mPremasterSecret);
}
return(new byte[pskLength]);
}
public override void ProcessClientKeyExchange(Stream input)
{
if (mDHAgreePublicKey != null)
{
// For dss_fixed_dh and rsa_fixed_dh, the key arrived in the client certificate
return;
}
this.mDHAgreePublicKey = new DHPublicKeyParameters(TlsDHUtilities.ReadDHParameter(input), mDHParameters);
}
public override void ProcessServerKeyExchange(Stream input)
{
if (!RequiresServerKeyExchange)
{
throw new TlsFatalAlert(AlertDescription.unexpected_message);
}
// DH_anon is handled here, DHE_* in a subclass
this.mDHParameters = TlsDHUtilities.ReceiveDHParameters(mDHVerifier, input);
this.mDHAgreePublicKey = new DHPublicKeyParameters(TlsDHUtilities.ReadDHParameter(input), mDHParameters);
}
public override void GenerateClientKeyExchange(Stream output)
{
/*
* RFC 2246 7.4.7.2 If the client certificate already contains a suitable Diffie-Hellman
* key, then Yc is implicit and does not need to be sent again. In this case, the Client Key
* Exchange message will be sent, but will be empty.
*/
if (mAgreementCredentials == null)
{
this.mDHAgreePrivateKey = TlsDHUtilities.GenerateEphemeralClientKeyExchange(mContext.SecureRandom,
mDHParameters, output);
}
}
public override byte[] GeneratePremasterSecret()
{
if (mAgreementCredentials != null)
{
return(mAgreementCredentials.GenerateAgreement(mDHAgreePublicKey));
}
if (mDHAgreePrivateKey != null)
{
return(TlsDHUtilities.CalculateDHBasicAgreement(mDHAgreePublicKey, mDHAgreePrivateKey));
}
throw new TlsFatalAlert(AlertDescription.internal_error);
}
public override byte[] GenerateServerKeyExchange()
{
if (!RequiresServerKeyExchange)
{
return(null);
}
// DH_anon is handled here, DHE_* in a subclass
MemoryStream buf = new MemoryStream();
this.mDHAgreePrivateKey = TlsDHUtilities.GenerateEphemeralServerKeyExchange(mContext.SecureRandom,
this.mDHParameters, buf);
return(buf.ToArray());
}
public override void GenerateClientKeyExchange(Stream output)
{
if (mPskIdentityHint == null)
{
mPskIdentity.SkipIdentityHint();
}
else
{
mPskIdentity.NotifyIdentityHint(mPskIdentityHint);
}
byte[] psk_identity = mPskIdentity.GetPskIdentity();
if (psk_identity == null)
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
this.mPsk = mPskIdentity.GetPsk();
if (mPsk == null)
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
TlsUtilities.WriteOpaque16(psk_identity, output);
mContext.SecurityParameters.pskIdentity = psk_identity;
if (this.mKeyExchange == KeyExchangeAlgorithm.DHE_PSK)
{
this.mDHAgreePrivateKey = TlsDHUtilities.GenerateEphemeralClientKeyExchange(mContext.SecureRandom,
mDHParameters, output);
}
else if (this.mKeyExchange == KeyExchangeAlgorithm.ECDHE_PSK)
{
this.mECAgreePrivateKey = TlsEccUtilities.GenerateEphemeralClientKeyExchange(mContext.SecureRandom,
mServerECPointFormats, mECAgreePublicKey.Parameters, output);
}
else if (this.mKeyExchange == KeyExchangeAlgorithm.RSA_PSK)
{
this.mPremasterSecret = TlsRsaUtilities.GenerateEncryptedPreMasterSecret(mContext,
this.mRsaServerPublicKey, output);
}
}
public override void ProcessServerKeyExchange(Stream input)
{
this.mPskIdentityHint = TlsUtilities.ReadOpaque16(input);
if (this.mKeyExchange == KeyExchangeAlgorithm.DHE_PSK)
{
this.mDHParameters = TlsDHUtilities.ReceiveDHParameters(mDHVerifier, input);
this.mDHAgreePublicKey = new DHPublicKeyParameters(TlsDHUtilities.ReadDHParameter(input), mDHParameters);
}
else if (this.mKeyExchange == KeyExchangeAlgorithm.ECDHE_PSK)
{
ECDomainParameters ecParams = TlsEccUtilities.ReadECParameters(mNamedCurves, mClientECPointFormats, input);
byte[] point = TlsUtilities.ReadOpaque8(input);
this.mECAgreePublicKey = TlsEccUtilities.ValidateECPublicKey(TlsEccUtilities.DeserializeECPublicKey(
mClientECPointFormats, ecParams, point));
}
}
public override void ProcessServerKeyExchange(Stream input)
{
SecurityParameters securityParameters = mContext.SecurityParameters;
SignerInputBuffer buf = new SignerInputBuffer();
Stream teeIn = new TeeInputStream(input, buf);
this.mDHParameters = TlsDHUtilities.ReceiveDHParameters(mDHVerifier, teeIn);
this.mDHAgreePublicKey = new DHPublicKeyParameters(TlsDHUtilities.ReadDHParameter(teeIn), mDHParameters);
DigitallySigned signed_params = ParseSignature(input);
ISigner signer = InitVerifyer(mTlsSigner, signed_params.Algorithm, securityParameters);
buf.UpdateSigner(signer);
if (!signer.VerifySignature(signed_params.Signature))
{
throw new TlsFatalAlert(AlertDescription.decrypt_error);
}
}
public override void ProcessClientKeyExchange(Stream input)
{
byte[] psk_identity = TlsUtilities.ReadOpaque16(input);
this.mPsk = mPskIdentityManager.GetPsk(psk_identity);
if (mPsk == null)
{
throw new TlsFatalAlert(AlertDescription.unknown_psk_identity);
}
mContext.SecurityParameters.pskIdentity = psk_identity;
if (this.mKeyExchange == KeyExchangeAlgorithm.DHE_PSK)
{
this.mDHAgreePublicKey = new DHPublicKeyParameters(TlsDHUtilities.ReadDHParameter(input), mDHParameters);
}
else if (this.mKeyExchange == KeyExchangeAlgorithm.ECDHE_PSK)
{
byte[] point = TlsUtilities.ReadOpaque8(input);
ECDomainParameters curve_params = this.mECAgreePrivateKey.Parameters;
this.mECAgreePublicKey = TlsEccUtilities.ValidateECPublicKey(TlsEccUtilities.DeserializeECPublicKey(
mServerECPointFormats, curve_params, point));
}
else if (this.mKeyExchange == KeyExchangeAlgorithm.RSA_PSK)
{
byte[] encryptedPreMasterSecret;
if (TlsUtilities.IsSsl(mContext))
{
// TODO Do any SSLv3 clients actually include the length?
encryptedPreMasterSecret = Streams.ReadAll(input);
}
else
{
encryptedPreMasterSecret = TlsUtilities.ReadOpaque16(input);
}
this.mPremasterSecret = mServerCredentials.DecryptPreMasterSecret(encryptedPreMasterSecret);
}
}
public override byte[] GenerateServerKeyExchange()
{
this.mPskIdentityHint = mPskIdentityManager.GetHint();
if (this.mPskIdentityHint == null && !RequiresServerKeyExchange)
{
return(null);
}
MemoryStream buf = new MemoryStream();
if (this.mPskIdentityHint == null)
{
TlsUtilities.WriteOpaque16(TlsUtilities.EmptyBytes, buf);
}
else
{
TlsUtilities.WriteOpaque16(this.mPskIdentityHint, buf);
}
if (this.mKeyExchange == KeyExchangeAlgorithm.DHE_PSK)
{
if (this.mDHParameters == null)
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
this.mDHAgreePrivateKey = TlsDHUtilities.GenerateEphemeralServerKeyExchange(mContext.SecureRandom,
this.mDHParameters, buf);
}
else if (this.mKeyExchange == KeyExchangeAlgorithm.ECDHE_PSK)
{
this.mECAgreePrivateKey = TlsEccUtilities.GenerateEphemeralServerKeyExchange(mContext.SecureRandom,
mNamedCurves, mClientECPointFormats, buf);
}
return(buf.ToArray());
}
public override byte[] GenerateServerKeyExchange()
{
if (this.mDHParameters == null)
{
throw new TlsFatalAlert(AlertDescription.internal_error);
}
DigestInputBuffer buf = new DigestInputBuffer();
this.mDHAgreePrivateKey = TlsDHUtilities.GenerateEphemeralServerKeyExchange(mContext.SecureRandom,
this.mDHParameters, buf);
/*
* RFC 5246 4.7. digitally-signed element needs SignatureAndHashAlgorithm from TLS 1.2
*/
SignatureAndHashAlgorithm signatureAndHashAlgorithm = TlsUtilities.GetSignatureAndHashAlgorithm(
mContext, mServerCredentials);
IDigest d = TlsUtilities.CreateHash(signatureAndHashAlgorithm);
SecurityParameters securityParameters = mContext.SecurityParameters;
d.BlockUpdate(securityParameters.clientRandom, 0, securityParameters.clientRandom.Length);
d.BlockUpdate(securityParameters.serverRandom, 0, securityParameters.serverRandom.Length);
buf.UpdateDigest(d);
byte[] hash = DigestUtilities.DoFinal(d);
byte[] signature = mServerCredentials.GenerateCertificateSignature(hash);
DigitallySigned signed_params = new DigitallySigned(signatureAndHashAlgorithm, signature);
signed_params.Encode(buf);
return(buf.ToArray());
}
