/**
SSLServerKeyExchange.java
Copyright (C) 1999, Claymore Systems, Inc.
All Rights Reserved.
ekr@rtfm.com Sat May 8 21:33:02 1999
This package is a SSLv3/TLS implementation written by Eric Rescorla
<ekr@rtfm.com> and licensed by Claymore Systems, Inc.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
must display the following acknowledgement:
This product includes software developed by Claymore Systems, Inc.
4. Neither the name of Claymore Systems, Inc. nor the name of Eric
Rescorla may be used to endorse or promote products derived from this
software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
$Id: SSLServerKeyExchange.java,v 1.1.1.1 2003/05/09 20:36:14 gawor Exp $
*/
package COM.claymoresystems.ptls;
import java.io.*;
import java.util.*;
import java.math.BigInteger;
import java.security.Signature;
import java.security.PublicKey;
import java.security.PrivateKey;
import java.security.MessageDigest;
import xjava.security.interfaces.CryptixRSAPublicKey;
import cryptix.provider.rsa.RawRSAPublicKey;
import COM.claymoresystems.crypto.DHPublicKey;
import COM.claymoresystems.crypto.DHPrivateKey;
import COM.claymoresystems.crypto.Blindable;
class SSLServerKeyExchange extends SSLPDU
{
SSLDHParams dh_params;
SSLRSAParams rsa_params;
SSLopaque signature=new SSLopaque(-65535);
SSLPDU par;
int wb=0;
String algorithm;
public int encode(SSLConn conn, OutputStream s)
throws IOException{
ByteArrayOutputStream kex_os=new ByteArrayOutputStream();
switch(conn.hs.cipher_suite.getKeyExchangeAlg()){
case SSLCipherSuite.SSL_KEX_DH:
conn.hs.dhEphemeral=conn.ctx.getEphemeralDHPrivateKey
(conn.policy.dhAlwaysEphemeralP());
par=dh_params=new SSLDHParams(conn.hs.dhEphemeral);
break;
case SSLCipherSuite.SSL_KEX_RSA:
conn.hs.rsaEphemeral=conn.ctx.getEphemeralRSAPrivateKey();
conn.hs.rsaEphemeralPublic=conn.ctx.getEphemeralRSAPublicKey();
par=rsa_params=new SSLRSAParams(conn.ctx.getEphemeralRSAPublicKey());
break;
default:
throw new Error("Unknown key exchange algorithm");
}
par.encode(conn,kex_os);
byte[] kex_enc=kex_os.toByteArray();
try {
byte[] toBeSigned;
// Sign the buffer
PrivateKey pk=conn.ctx.getPrivateKey();
String alg=conn.hs.cipher_suite.getSignatureAlgCV();
Signature sigChecker;
if(alg.equals("RawDSA")){
sigChecker=Signature.getInstance(alg,
LoadProviders.getDSAProvider());
sigChecker.setParameter("SecureRandom",
conn.hs.rng);
}
else if(alg.equals("RawRSA")){
sigChecker=Signature.getInstance(alg);
((Blindable)sigChecker).setBlindingInfo(conn.hs.rng,
(CryptixRSAPublicKey)conn.ctx.getPublicKey());
}
else{
throw new Exception("Unknown key type");
}
sigChecker.initSign(pk);
toBeSigned=getToBeSigned(conn,alg,kex_enc);
// Test
// toBeSigned[0]++;
sigChecker.update(toBeSigned);
byte[] sig=sigChecker.sign();
SSLDebug.debug(SSLDebug.DEBUG_CRYPTO,"Signed Data", kex_enc);
SSLDebug.debug(SSLDebug.DEBUG_CRYPTO,"Signature Data", sig);
// Test
//sig[sig.length-1]++;
signature.value=sig;
} catch (Exception e){
throw new InternalError(e.toString());
}
wb=par.encode(conn,s);
wb+=signature.encode(conn,s);
return wb;
}
public int decode(SSLConn conn, InputStream s)
throws Error, java.io.IOException{
int rb;
PublicKey tmp_pk=null;
PublicKey pk=conn.hs.peerSignatureKey;
String algorithm;
ByteArrayOutputStream kex_os=new ByteArrayOutputStream();
if(!conn.hs.cipher_suite.allowServerKeyExchangeP(pk)){
conn.alert(SSLAlertX.TLS_ALERT_ILLEGAL_PARAMETER);
}
switch(conn.hs.cipher_suite.getKeyExchangeAlg()){
case SSLCipherSuite.SSL_KEX_DH:
dh_params=new SSLDHParams();
rb=dh_params.decode(conn,s);
dh_params.encode(conn,kex_os);
tmp_pk=new DHPublicKey(
new BigInteger(1,dh_params.DH_g.value),
new BigInteger(1,dh_params.DH_p.value),
new BigInteger(1,dh_params.DH_Ys.value));
break;
case SSLCipherSuite.SSL_KEX_RSA:
rsa_params=new SSLRSAParams();
rb=rsa_params.decode(conn,s);
rsa_params.encode(conn,kex_os);
BigInteger mod=new BigInteger(1,rsa_params.RSA_modulus.value);
BigInteger exp=new BigInteger(1,rsa_params.RSA_exponent.value);
if(mod.bitLength()>512)
conn.alert(SSLAlertX.TLS_ALERT_ILLEGAL_PARAMETER);
tmp_pk=new RawRSAPublicKey(mod,exp);
break;
default:
throw new Error("Unknown key exchange algorithm");
}
int params_size=rb;
rb+=signature.decode(conn,s);
byte[] kex_enc=kex_os.toByteArray();
if(kex_enc.length!=params_size)
throw new InternalError("Inconsistency in param size");
try {
// Check the signature
String alg=conn.hs.cipher_suite.getSignatureAlgCV();
Signature sigChecker=Signature.getInstance(alg);
checkSignatureKey(conn,pk,alg);
sigChecker.initVerify(pk);
byte[] toBeSigned=getToBeSigned(conn,alg,kex_enc);
sigChecker.update(toBeSigned);
SSLDebug.debug(SSLDebug.DEBUG_CRYPTO,"Signed Data", kex_enc);
SSLDebug.debug(SSLDebug.DEBUG_CRYPTO,"Signature Data", signature.value);
if(!sigChecker.verify(signature.value))
conn.alert(SSLAlertX.TLS_ALERT_DECRYPT_ERROR);
} catch (java.security.NoSuchAlgorithmException e){
throw new InternalError(e.toString());
} catch (java.security.InvalidKeyException e){
conn.alert(SSLAlertX.TLS_ALERT_DECRYPT_ERROR);
} catch (java.security.SignatureException e){
conn.alert(SSLAlertX.TLS_ALERT_DECRYPT_ERROR);
}
conn.hs.peerEncryptionKey=tmp_pk;
return rb;
}
private byte[] getToBeSigned(SSLConn conn,String alg,
byte[] kex_enc) throws java.security.NoSuchAlgorithmException{
byte[] toBeSigned;
MessageDigest md5,sha;
sha=MessageDigest.getInstance("SHA-1");
sha.update(conn.hs.client_random);
sha.update(conn.hs.server_random);
sha.update(kex_enc);
if(alg.equals("RawRSA")){
md5=MessageDigest.getInstance("MD5");
md5.update(conn.hs.client_random);
md5.update(conn.hs.server_random);
md5.update(kex_enc);
byte[] md5dig=md5.digest();
byte[] shadig=sha.digest();
toBeSigned=new byte[36];
System.arraycopy(md5dig,0,toBeSigned,0,md5dig.length);
System.arraycopy(shadig,0,toBeSigned,16,shadig.length);
}
else
toBeSigned=sha.digest();
return(toBeSigned);
}
private void checkSignatureKey(SSLConn conn,PublicKey key,String alg)
throws IOException {
if(alg.equals("RawRSA")){
if(!(key instanceof xjava.security.interfaces.CryptixRSAPublicKey)){
conn.alert(SSLAlertX.TLS_ALERT_ILLEGAL_PARAMETER);
}
}
else if(alg.equals("RawDSA")){
if(!(key instanceof java.security.interfaces.DSAPublicKey)){
conn.alert(SSLAlertX.TLS_ALERT_ILLEGAL_PARAMETER);
}
}
else {
throw new InternalError("Unknown Algorithm");
}
}
}