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Code Issues Releases Wiki Activity

Introduce RandomUtil

Browse source 
and use it in EncryptedOpenPgpContentElement
This commit is contained in:
Florian Schmaus 2019-03-25 12:07:01 +01:00
parent 927eb5e7d7
commit 14f288a763
3 changed files with 52 additions and 27 deletions
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46
smack-core/src/main/java/org/jivesoftware/smack/util/RandomUtil.java Normal file
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@ -0,0 +1,46 @@
/**
*
* Copyright 2003-2007 Jive Software, 2016-2019 Florian Schmaus.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.jivesoftware.smack.util;
import java.security.SecureRandom;
import java.util.Random;
public class RandomUtil {
static final ThreadLocal<SecureRandom> SECURE_RANDOM = new ThreadLocal<SecureRandom>() {
@Override
protected SecureRandom initialValue() {
return new SecureRandom();
}
};
/**
* Pseudo-random number generator object for use with randomString().
* The Random class is not considered to be cryptographically secure, so
* only use these random Strings for low to medium security applications.
*/
static final ThreadLocal<Random> RANDOM = new ThreadLocal<Random>() {
@Override
protected Random initialValue() {
return new Random();
}
};
public static int nextSecureRandomInt(int bound) {
return SECURE_RANDOM.get().nextInt(bound);
}
}

26
smack-core/src/main/java/org/jivesoftware/smack/util/StringUtils.java
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@ -1,6 +1,6 @@
/**
*
* Copyright 2003-2007 Jive Software, 2016-2018 Florian Schmaus.
* Copyright 2003-2007 Jive Software, 2016-2019 Florian Schmaus.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -18,7 +18,6 @@
package org.jivesoftware.smack.util;
import java.io.UnsupportedEncodingException;
import java.security.SecureRandom;
import java.util.Collection;
import java.util.Iterator;
import java.util.Random;
@ -253,18 +252,6 @@ public class StringUtils {
}
}
/**
* Pseudo-random number generator object for use with randomString().
* The Random class is not considered to be cryptographically secure, so
* only use these random Strings for low to medium security applications.
*/
private static final ThreadLocal<Random> randGen = new ThreadLocal<Random>() {
@Override
protected Random initialValue() {
return new Random();
}
};
/**
* Array of numbers and letters of mixed case. Numbers appear in the list
* twice so that there is a more equal chance that a number will be picked.
@ -288,18 +275,11 @@ public class StringUtils {
* @return a random String of numbers and letters of the specified length.
*/
public static String insecureRandomString(int length) {
return randomString(length, randGen.get());
return randomString(length, RandomUtil.RANDOM.get());
}
private static final ThreadLocal<SecureRandom> SECURE_RANDOM = new ThreadLocal<SecureRandom>() {
@Override
protected SecureRandom initialValue() {
return new SecureRandom();
}
};
public static String randomString(final int length) {
return randomString(length, SECURE_RANDOM.get());
return randomString(length, RandomUtil.SECURE_RANDOM.get());
}
public static String randomString(final int length, Random random) {

7
smack-openpgp/src/main/java/org/jivesoftware/smackx/ox/element/EncryptedOpenPgpContentElement.java
View file

@ -1,6 +1,6 @@
/**
*
* Copyright 2017 Florian Schmaus, 2018 Paul Schaub.
* Copyright 2017-2019 Florian Schmaus, 2018 Paul Schaub.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
@ -16,13 +16,13 @@
*/
package org.jivesoftware.smackx.ox.element;
import java.security.SecureRandom;
import java.util.Date;
import java.util.List;
import java.util.Set;
import org.jivesoftware.smack.packet.ExtensionElement;
import org.jivesoftware.smack.util.Objects;
import org.jivesoftware.smack.util.RandomUtil;
import org.jivesoftware.smack.util.StringUtils;
import org.jivesoftware.smack.util.XmlStringBuilder;
@ -53,8 +53,7 @@ public abstract class EncryptedOpenPgpContentElement extends OpenPgpContentEleme
}
private static String createRandomPadding() {
SecureRandom secRan = new SecureRandom();
int len = secRan.nextInt(256);
int len = RandomUtil.nextSecureRandomInt(256);
return StringUtils.randomString(len);
}