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Java Source Code / Java Documentation » Portal » Open Portal » com.sun.portal.rewriter.util.crypto

Source Cross Reference

Class Diagram

Java Document (Java Doc)

java.lang .Object

com.sun.portal.rewriter.util.crypto .RandomString

RandomString
final public class RandomString (Code)

Method Summary
public static String	create(String aSeed)
public char[]	getPassChars(char[] pass) Fill the given buffer with random characters. Using this method, the password character array can easily be reused for efficiency, or overwritten with new random characters for security. NOTE: If it is possible for a hacker to examine memory to find passwords, the password should be overwritten in memory as soon as possible after i is no longer in use. Parameters: pass - buffer that will hold the password.
public static void	main(String[] args)
public void	setFirstAlphabet(char[] alphabet)
public void	setLastAlphabet(char[] alphabet) Set the alphabet used by this random password generator for the last character of passwords.
public void	setMaxRepetition(int rep) Set the maximum number of characters that may appear in sequence more than once in a password.

Method Detail

create
public static String create(String aSeed)(Code)

getPassChars

public char[] getPassChars(char[] pass)(Code)

Fill the given buffer with random characters.

Using this method, the password character array can easily be reused for efficiency, or overwritten with new random characters for security.

NOTE: If it is possible for a hacker to examine memory to find passwords, the password should be overwritten in memory as soon as possible after i is no longer in use.
Parameters:
pass - buffer that will hold the password. the buffer, filled with random characters.

main
public static void main(String[] args) throws Exception(Code)

setFirstAlphabet
public void setFirstAlphabet(char[] alphabet)(Code)

setLastAlphabet
public void setLastAlphabet(char[] alphabet)(Code)
	Set the alphabet used by this random password generator for the last character of passwords. If the alphabet for the last character is set to null or has no elements, the main alphabet will be used for the last character. Parameters: alphabet - Characters allowed for the last character of the passwords.

setMaxRepetition

public void setMaxRepetition(int rep)(Code)

Set the maximum number of characters that may appear in sequence more than once in a password. Your alphabet must be large enough to handle this option. If your alphabet is {'a', 'b'} and you want 8 character passwords in which no character appears twice (repetition 1) you are out of luck. In such instances your request for no repetition will be ignored.

For example setRepetition(3) will allow a password ababab but not allow abcabc.

Using this method can greatly reduce the pool of passwords that are generated. For example if only one repetition is allowed then the pool of passwords is the permutation of the alphabet rather than the combination.
Parameters:
rep - Maximum character repetition.

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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