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gnu.java.security.util

Class Util

public class Util
extends Object
A collection of utility methods used throughout this project.

Method Summary

static String
byteToString(int n)
Returns a string of 2 hexadecimal digits (most significant digit first) corresponding to the lowest 8 bits of n.
static String
dump(BigInteger x)
Returns a hexadecimal dump of the trimmed bytes of a BigInteger.
static String
dumpString(byte[] data)
static String
dumpString(byte[] data, int offset, int length)
static String
dumpString(byte[] data, int offset, int length, String m)
Dumps a byte array as a string, in a format that is easy to read for debugging.
static String
dumpString(byte[] data, String m)
static byte[]
fromBase64(String str)
The inverse function of the above.
static int
fromDigit(char c)
Returns a number from 0 to 15 corresponding to the designated hexadecimal digit.
static String
toBase64(byte[] buffer)
Converts a designated byte array to a Base-64 representation, with the exceptions that (a) leading 0-byte(s) are ignored, and (b) the character '.' (dot) shall be used instead of "+' (plus).
static byte[]
toBytesFromString(String s)
Returns a byte array from a string of hexadecimal digits.
static byte[]
toBytesFromUnicode(String s)
static byte[]
toReversedBytesFromString(String s)
Returns a byte array from a string of hexadecimal digits, interpreting them as a large big-endian integer and returning it as a large little-endian integer.
static String
toReversedString(byte[] ba)
Returns a string of hexadecimal digits from a byte array.
static String
toReversedString(byte[] ba, int offset, int length)
Returns a string of hexadecimal digits from a byte array, starting at offset and consisting of length bytes.
static String
toString(byte[] ba)
Returns a string of hexadecimal digits from a byte array.
static String
toString(byte[] ba, int offset, int length)
Returns a string of hexadecimal digits from a byte array, starting at offset and consisting of length bytes.
static String
toString(int n)
Returns a string of 8 hexadecimal digits (most significant digit first) corresponding to the unsigned integer n.
static String
toString(int[] ia)
Returns a string of hexadecimal digits from an integer array.
static String
toString(long n)
Returns a string of 16 hexadecimal digits (most significant digit first) corresponding to the unsigned long n.
static String
toUnicodeString(byte[] ba)
Similar to the toString() method except that the Unicode escape character is inserted before every pair of bytes.
static String
toUnicodeString(byte[] ba, int offset, int length)
Similar to the toString() method except that the Unicode escape character is inserted before every pair of bytes.
static String
toUnicodeString(int[] ia)
Similar to the toString() method except that the Unicode escape character is inserted before every pair of bytes.
static byte[]
trim(BigInteger n)
Treats the input as the MSB representation of a number, and discards leading zero elements.

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

byteToString

public static String byteToString(int n)
Returns a string of 2 hexadecimal digits (most significant digit first) corresponding to the lowest 8 bits of n.
Parameters:
n - the byte value to convert.
Returns:
a string of 2 hex characters representing the input.

dump

public static final String dump(BigInteger x)
Returns a hexadecimal dump of the trimmed bytes of a BigInteger.
Parameters:
x - the BigInteger to display.
Returns:
the string representation of the designated BigInteger.

dumpString

public static String dumpString(byte[] data)

dumpString

public static String dumpString(byte[] data,
                                int offset,
                                int length)

dumpString

public static String dumpString(byte[] data,
                                int offset,
                                int length,
                                String m)
Dumps a byte array as a string, in a format that is easy to read for debugging. The string m is prepended to the start of each line.

If offset and length are omitted, the whole array is used. If m is omitted, nothing is prepended to each line.

Parameters:
data - the byte array to be dumped.
offset - the offset within data to start from.
length - the number of bytes to dump.
m - a string to be prepended to each line.
Returns:
a string containing the result.

dumpString

public static String dumpString(byte[] data,
                                String m)

fromBase64

public static final byte[] fromBase64(String str)
The inverse function of the above.

Converts a string representing the encoding of some bytes in Base-64 to their original form.

Parameters:
str - the Base-64 encoded representation of some byte(s).
Returns:
the bytes represented by the str.
Throws:
NumberFormatException - if str is null, or str contains an illegal Base-64 character.
See Also:
toBase64(byte[])

fromDigit

public static int fromDigit(char c)
Returns a number from 0 to 15 corresponding to the designated hexadecimal digit.
Parameters:
c - a hexadecimal ASCII symbol.

toBase64

public static final String toBase64(byte[] buffer)
Converts a designated byte array to a Base-64 representation, with the exceptions that (a) leading 0-byte(s) are ignored, and (b) the character '.' (dot) shall be used instead of "+' (plus).

Used by SASL password file manipulation primitives.

Parameters:
buffer - an arbitrary sequence of bytes to represent in Base-64.
Returns:
unpadded (without the '=' character(s)) Base-64 representation of the input.

toBytesFromString

public static byte[] toBytesFromString(String s)
Returns a byte array from a string of hexadecimal digits.
Parameters:
s - a string of hexadecimal ASCII characters
Returns:
the decoded byte array from the input hexadecimal string.

toBytesFromUnicode

public static byte[] toBytesFromUnicode(String s)

toReversedBytesFromString

public static byte[] toReversedBytesFromString(String s)
Returns a byte array from a string of hexadecimal digits, interpreting them as a large big-endian integer and returning it as a large little-endian integer.
Parameters:
s - a string of hexadecimal ASCII characters
Returns:
the decoded byte array from the input hexadecimal string.

toReversedString

public static String toReversedString(byte[] ba)
Returns a string of hexadecimal digits from a byte array. Each byte is converted to 2 hex symbols; zero(es) included. The argument is treated as a large little-endian integer and is returned as a large big-endian integer.

This method calls the method with same name and three arguments as: 

 toReversedString(ba, 0, ba.length);
Parameters:
ba - the byte array to convert.
Returns:
a string of hexadecimal characters (two for each byte) representing the designated input byte array.

toReversedString

public static final String toReversedString(byte[] ba,
                                            int offset,
                                            int length)
Returns a string of hexadecimal digits from a byte array, starting at offset and consisting of length bytes. Each byte is converted to 2 hex symbols; zero(es) included.

The byte array is treated as a large little-endian integer, and is returned as a large big-endian integer.

Parameters:
ba - the byte array to convert.
offset - the index from which to start considering the bytes to convert.
length - the count of bytes, starting from the designated offset to convert.
Returns:
a string of hexadecimal characters (two for each byte) representing the designated input byte sub-array.

toString

public static String toString(byte[] ba)
Returns a string of hexadecimal digits from a byte array. Each byte is converted to 2 hex symbols; zero(es) included.

This method calls the method with same name and three arguments as: 

 toString(ba, 0, ba.length);
Parameters:
ba - the byte array to convert.
Returns:
a string of hexadecimal characters (two for each byte) representing the designated input byte array.

toString

public static final String toString(byte[] ba,
                                    int offset,
                                    int length)
Returns a string of hexadecimal digits from a byte array, starting at offset and consisting of length bytes. Each byte is converted to 2 hex symbols; zero(es) included.
Parameters:
ba - the byte array to convert.
offset - the index from which to start considering the bytes to convert.
length - the count of bytes, starting from the designated offset to convert.
Returns:
a string of hexadecimal characters (two for each byte) representing the designated input byte sub-array.

toString

public static String toString(int n)
Returns a string of 8 hexadecimal digits (most significant digit first) corresponding to the unsigned integer n.
Parameters:
n - the unsigned integer to convert.
Returns:
a hexadecimal string 8-character long.

toString

public static String toString(int[] ia)
Returns a string of hexadecimal digits from an integer array. Each int is converted to 4 hex symbols.

toString

public static String toString(long n)
Returns a string of 16 hexadecimal digits (most significant digit first) corresponding to the unsigned long n.
Parameters:
n - the unsigned long to convert.
Returns:
a hexadecimal string 16-character long.

toUnicodeString

public static String toUnicodeString(byte[] ba)
Similar to the toString() method except that the Unicode escape character is inserted before every pair of bytes. Useful to externalise byte arrays that will be constructed later from such strings; eg. s-box values.
Throws:
ArrayIndexOutOfBoundsException - if the length is odd.

toUnicodeString

public static final String toUnicodeString(byte[] ba,
                                           int offset,
                                           int length)
Similar to the toString() method except that the Unicode escape character is inserted before every pair of bytes. Useful to externalise byte arrays that will be constructed later from such strings; eg. s-box values.
Throws:
ArrayIndexOutOfBoundsException - if the length is odd.

toUnicodeString

public static String toUnicodeString(int[] ia)
Similar to the toString() method except that the Unicode escape character is inserted before every pair of bytes. Useful to externalise integer arrays that will be constructed later from such strings; eg. s-box values.
Throws:
ArrayIndexOutOfBoundsException - if the length is not a multiple of 4.

trim

public static final byte[] trim(BigInteger n)
Treats the input as the MSB representation of a number, and discards leading zero elements. For efficiency, the input is simply returned if no leading zeroes are found.
Parameters:
n - the BigInteger to trim.
Returns:
the byte array representation of the designated BigInteger with no leading 0-bytes.
Util.java -- various utility routines. Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc. This file is a part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.

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