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Implements dynamic strength key generation for BlowfishKeygenService

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This commit is contained in:
Rogiel Sulzbach
2012-05-05 17:10:20 -03:00
parent 5ba7f75cf0
commit b9c07d5c27
4 changed files with 17 additions and 8 deletions
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2
l2jserver2-gameserver/l2jserver2-gameserver-core/src/main/java/com/l2jserver/game/net/packet/client/CM_PROTOCOL_VERSION.java
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@@ -83,7 +83,7 @@ public class CM_PROTOCOL_VERSION extends AbstractClientPacket {
public void process(final Lineage2Client conn) {
// generate a new key
final Lineage2CryptographyKey inKey = new Lineage2CryptographyKey(
keygen.generate());
keygen.generate(128));
conn.enableDecrypter(inKey);
final Lineage2CryptographyKey outKey = inKey.copy();

5
l2jserver2-gameserver/l2jserver2-gameserver-core/src/main/java/com/l2jserver/service/network/keygen/BlowfishKeygenService.java
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@@ -31,7 +31,10 @@ public interface BlowfishKeygenService extends Service {
* Creates a new 128 bits key. Note that the key is not necessarily random
* and can be a fixed key.
*
* @param strength
* the key strength. Must be a multiple of 8.
*
* @return the 128 bits key
*/
byte[] generate();
byte[] generate(int strength);
}

9
l2jserver2-gameserver/l2jserver2-gameserver-core/src/main/java/com/l2jserver/service/network/keygen/PseudoRandomBlowfishKeygenService.java
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@@ -21,6 +21,7 @@ import java.util.Random;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Preconditions;
import com.l2jserver.service.AbstractService;
import com.l2jserver.service.ServiceStartException;
import com.l2jserver.service.ServiceStopException;
@@ -49,10 +50,12 @@ public class PseudoRandomBlowfishKeygenService extends AbstractService
}
@Override
public byte[] generate() {
log.debug("Generating a new key");
public byte[] generate(int strength) {
Preconditions.checkArgument(strength % 8 == 0,
"strength must be a multiple of 8");
log.debug("Generating a new {}-bit key", strength);
final byte[] key = new byte[16];
final byte[] key = new byte[strength / 8];
// randomize the 8 first bytes
for (int i = 0; i < key.length; i++) {
key[i] = (byte) random.nextInt(255);

9
l2jserver2-gameserver/l2jserver2-gameserver-core/src/main/java/com/l2jserver/service/network/keygen/SecureBlowfishKeygenService.java
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@@ -21,6 +21,7 @@ import org.apache.commons.math.random.RandomDataImpl;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.common.base.Preconditions;
import com.l2jserver.service.AbstractService;
import com.l2jserver.service.ServiceStartException;
import com.l2jserver.service.ServiceStopException;
@@ -50,10 +51,12 @@ public class SecureBlowfishKeygenService extends AbstractService implements
}
@Override
public byte[] generate() {
log.debug("Generating a new key");
public byte[] generate(int strength) {
Preconditions.checkArgument(strength % 8 == 0,
"strength must be a multiple of 8");
log.debug("Generating a new {}-bit key", strength);
final byte[] key = new byte[16];
final byte[] key = new byte[strength / 8];
// randomize the 8 first bytes
for (int i = 0; i < key.length; i++) {
key[i] = (byte) random.nextSecureInt(0, 255);