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package org.openslx.imagemaster.util;
import java.security.SecureRandom;
/**
* Generate secure random strings
* @author nils
*
*/
public class RandomString {
private static final String lettersSpecial="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890+-$%&/()=?@";
private static final String letters="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
private static final SecureRandom random = new SecureRandom();
/**
* Generate a random string.
* @param length the length of the string
* @param specialChars whether to use special charachters or not
* @return the generated string
*/
public static String generate(int length, boolean specialChars) {
String used = (specialChars)? lettersSpecial : letters;
String result = "";
for (int i = 0; i < length; i++) {
int index = (int)(random.nextDouble()*used.length());
result += used.substring( index, index + 1 );
}
return result;
}
}
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