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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package com.sun.crypto.provider;
import java.security.*;
import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.*;
import javax.crypto.spec.*;
import sun.security.internal.interfaces.TlsMasterSecret;
import sun.security.internal.spec.*;
import static com.sun.crypto.provider.TlsPrfGenerator.*;
/**
* KeyGenerator implementation for the SSL/TLS master secret derivation.
*
* @author Andreas Sterbenz
* @since 1.6
*/
public final class TlsKeyMaterialGenerator extends KeyGeneratorSpi {
private final static String MSG = "TlsKeyMaterialGenerator must be "
+ "initialized using a TlsKeyMaterialParameterSpec";
private TlsKeyMaterialParameterSpec spec;
private int protocolVersion;
public TlsKeyMaterialGenerator() {
SunJCE.ensureIntegrity(getClass());
}
protected void engineInit(SecureRandom random) {
throw new InvalidParameterException(MSG);
}
protected void engineInit(AlgorithmParameterSpec params,
SecureRandom random) throws InvalidAlgorithmParameterException {
if (params instanceof TlsKeyMaterialParameterSpec == false) {
throw new InvalidAlgorithmParameterException(MSG);
}
this.spec = (TlsKeyMaterialParameterSpec)params;
if ("RAW".equals(spec.getMasterSecret().getFormat()) == false) {
throw new InvalidAlgorithmParameterException("Key format must be RAW");
}
protocolVersion = (spec.getMajorVersion() << 8) | spec.getMinorVersion();
if ((protocolVersion < 0x0300) || (protocolVersion > 0x0302)) {
throw new InvalidAlgorithmParameterException
("Only SSL 3.0, TLS 1.0, and TLS 1.1 supported");
}
}
protected void engineInit(int keysize, SecureRandom random) {
throw new InvalidParameterException(MSG);
}
protected SecretKey engineGenerateKey() {
if (spec == null) {
throw new IllegalStateException
("TlsKeyMaterialGenerator must be initialized");
}
try {
return engineGenerateKey0();
} catch (GeneralSecurityException e) {
throw new ProviderException(e);
}
}
private SecretKey engineGenerateKey0() throws GeneralSecurityException {
byte[] masterSecret = spec.getMasterSecret().getEncoded();
byte[] clientRandom = spec.getClientRandom();
byte[] serverRandom = spec.getServerRandom();
SecretKey clientMacKey = null;
SecretKey serverMacKey = null;
SecretKey clientCipherKey = null;
IvParameterSpec clientIv = null;
SecretKey serverCipherKey = null;
IvParameterSpec serverIv = null;
int macLength = spec.getMacKeyLength();
int expandedKeyLength = spec.getExpandedCipherKeyLength();
boolean isExportable = (expandedKeyLength != 0);
int keyLength = spec.getCipherKeyLength();
int ivLength = spec.getIvLength();
int keyBlockLen = macLength + keyLength + (isExportable ? 0 : ivLength);
keyBlockLen <<= 1;
byte[] keyBlock = new byte[keyBlockLen];
MessageDigest md5 = MessageDigest.getInstance("MD5");
MessageDigest sha = MessageDigest.getInstance("SHA1");
// generate key block
if (protocolVersion >= 0x0301) {
// TLS
byte[] seed = concat(serverRandom, clientRandom);
keyBlock = doPRF(masterSecret, LABEL_KEY_EXPANSION, seed,
keyBlockLen, md5, sha);
} else {
// SSL
keyBlock = new byte[keyBlockLen];
byte[] tmp = new byte[20];
for (int i = 0, remaining = keyBlockLen;
remaining > 0;
i++, remaining -= 16) {
sha.update(SSL3_CONST[i]);
sha.update(masterSecret);
sha.update(serverRandom);
sha.update(clientRandom);
sha.digest(tmp, 0, 20);
md5.update(masterSecret);
md5.update(tmp);
if (remaining >= 16) {
md5.digest(keyBlock, i << 4, 16);
} else {
md5.digest(tmp, 0, 16);
System.arraycopy(tmp, 0, keyBlock, i << 4, remaining);
}
}
}
// partition keyblock into individual secrets
int ofs = 0;
byte[] tmp = new byte[macLength];
// mac keys
System.arraycopy(keyBlock, ofs, tmp, 0, macLength);
ofs += macLength;
clientMacKey = new SecretKeySpec(tmp, "Mac");
System.arraycopy(keyBlock, ofs, tmp, 0, macLength);
ofs += macLength;
serverMacKey = new SecretKeySpec(tmp, "Mac");
if (keyLength == 0) { // SSL_RSA_WITH_NULL_* ciphersuites
return new TlsKeyMaterialSpec(clientMacKey, serverMacKey);
}
String alg = spec.getCipherAlgorithm();
byte[] clientKeyBytes = new byte[keyLength];
System.arraycopy(keyBlock, ofs, clientKeyBytes, 0, keyLength);
ofs += keyLength;
byte[] serverKeyBytes = new byte[keyLength];
System.arraycopy(keyBlock, ofs, serverKeyBytes, 0, keyLength);
ofs += keyLength;
if (isExportable == false) {
// cipher keys
clientCipherKey = new SecretKeySpec(clientKeyBytes, alg);
serverCipherKey = new SecretKeySpec(serverKeyBytes, alg);
if (ivLength != 0) {
tmp = new byte[ivLength];
System.arraycopy(keyBlock, ofs, tmp, 0, ivLength);
ofs += ivLength;
clientIv = new IvParameterSpec(tmp);
System.arraycopy(keyBlock, ofs, tmp, 0, ivLength);
ofs += ivLength;
serverIv = new IvParameterSpec(tmp);
}
} else {
// cipher key expansion and IV generation
if (protocolVersion >= 0x0301) {
byte[] seed = concat(clientRandom, serverRandom);
tmp = doPRF(clientKeyBytes, LABEL_CLIENT_WRITE_KEY, seed,
expandedKeyLength, md5, sha);
clientCipherKey = new SecretKeySpec(tmp, alg);
tmp = doPRF(serverKeyBytes, LABEL_SERVER_WRITE_KEY, seed,
expandedKeyLength, md5, sha);
serverCipherKey = new SecretKeySpec(tmp, alg);
if (ivLength != 0) {
tmp = new byte[ivLength];
byte[] block = doPRF(null, LABEL_IV_BLOCK, seed,
ivLength << 1, md5, sha);
System.arraycopy(block, 0, tmp, 0, ivLength);
clientIv = new IvParameterSpec(tmp);
System.arraycopy(block, ivLength, tmp, 0, ivLength);
serverIv = new IvParameterSpec(tmp);
}
} else {
tmp = new byte[expandedKeyLength];
md5.update(clientKeyBytes);
md5.update(clientRandom);
md5.update(serverRandom);
System.arraycopy(md5.digest(), 0, tmp, 0, expandedKeyLength);
clientCipherKey = new SecretKeySpec(tmp, alg);
md5.update(serverKeyBytes);
md5.update(serverRandom);
md5.update(clientRandom);
System.arraycopy(md5.digest(), 0, tmp, 0, expandedKeyLength);
serverCipherKey = new SecretKeySpec(tmp, alg);
if (ivLength != 0) {
tmp = new byte[ivLength];
md5.update(clientRandom);
md5.update(serverRandom);
System.arraycopy(md5.digest(), 0, tmp, 0, ivLength);
clientIv = new IvParameterSpec(tmp);
md5.update(serverRandom);
md5.update(clientRandom);
System.arraycopy(md5.digest(), 0, tmp, 0, ivLength);
serverIv = new IvParameterSpec(tmp);
}
}
}
return new TlsKeyMaterialSpec(clientMacKey, serverMacKey,
clientCipherKey, clientIv, serverCipherKey, serverIv);
}
}