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/*
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* Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package sun.security.jgss;
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import java.io.InputStream;
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import java.io.OutputStream;
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import java.io.IOException;
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import java.io.EOFException;
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import sun.security.util.*;
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/**
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* Utilities for processing GSS Tokens.
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*
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*/
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public abstract class GSSToken {
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/**
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* Copies an integer value to a byte array in little endian form.
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* @param value the integer value to write
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* @param array the byte array into which the integer must be copied. It
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* is assumed that the array will be large enough to hold the 4 bytes of
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* the integer.
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*/
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public static final void writeLittleEndian(int value, byte[] array) {
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writeLittleEndian(value, array, 0);
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}
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/**
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* Copies an integer value to a byte array in little endian form.
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* @param value the integer value to write
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* @param array the byte array into which the integer must be copied. It
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* is assumed that the array will be large enough to hold the 4 bytes of
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* the integer.
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* @param pos the position at which to start writing
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*/
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public static final void writeLittleEndian(int value, byte[] array,
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int pos) {
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array[pos++] = (byte)(value);
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array[pos++] = (byte)((value>>>8));
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array[pos++] = (byte)((value>>>16));
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array[pos++] = (byte)((value>>>24));
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}
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public static final void writeBigEndian(int value, byte[] array) {
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writeBigEndian(value, array, 0);
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}
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public static final void writeBigEndian(int value, byte[] array,
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int pos) {
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array[pos++] = (byte)((value>>>24));
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array[pos++] = (byte)((value>>>16));
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array[pos++] = (byte)((value>>>8));
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array[pos++] = (byte)(value);
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}
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/**
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* Reads an integer value from a byte array in little endian form. This
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* method allows the reading of two byte values as well as four bytes
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* values both of which are needed in the Kerberos v5 GSS-API mechanism.
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*
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* @param data the array containing the bytes of the integer value
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* @param pos the offset in the array
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* @size the number of bytes to read from the array.
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* @return the integer value
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*/
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public static final int readLittleEndian(byte[] data, int pos, int size) {
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int retVal = 0;
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int shifter = 0;
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while (size > 0) {
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retVal += (data[pos] & 0xff) << shifter;
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shifter += 8;
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pos++;
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size--;
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}
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return retVal;
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}
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public static final int readBigEndian(byte[] data, int pos, int size) {
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int retVal = 0;
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int shifter = (size-1)*8;
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while (size > 0) {
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retVal += (data[pos] & 0xff) << shifter;
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shifter -= 8;
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pos++;
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size--;
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}
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return retVal;
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}
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/**
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* Writes a two byte integer value to a OutputStream.
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*
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* @param val the integer value. It will lose the high-order two bytes.
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* @param os the OutputStream to write to
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* @throws IOException if an error occurs while writing to the OutputStream
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*/
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public static final void writeInt(int val, OutputStream os)
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throws IOException {
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os.write(val>>>8);
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os.write(val);
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}
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/**
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* Writes a two byte integer value to a byte array.
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*
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* @param val the integer value. It will lose the high-order two bytes.
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* @param dest the byte array to write to
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* @param pos the offset to start writing to
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*/
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public static final int writeInt(int val, byte[] dest, int pos) {
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dest[pos++] = (byte)(val>>>8);
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dest[pos++] = (byte)val;
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return pos;
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}
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/**
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* Reads a two byte integer value from an InputStream.
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*
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* @param is the InputStream to read from
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* @returns the integer value
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* @throws IOException if some errors occurs while reading the integer
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* bytes.
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*/
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public static final int readInt(InputStream is) throws IOException {
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return (((0xFF & is.read()) << 8)
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| (0xFF & is.read()));
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}
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/**
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* Reads a two byte integer value from a byte array.
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*
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* @param src the byte arra to read from
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* @param pos the offset to start reading from
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* @returns the integer value
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*/
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public static final int readInt(byte[] src, int pos) {
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return ((0xFF & src[pos])<<8 | (0xFF & src[pos+1]));
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}
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/**
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* Blocks till the required number of bytes have been read from the
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* input stream.
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*
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* @param is the InputStream to read from
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* @param buffer the buffer to store the bytes into
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* @param throws EOFException if EOF is reached before all bytes are
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* read.
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* @throws IOException is an error occurs while reading
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*/
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public static final void readFully(InputStream is, byte[] buffer)
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throws IOException {
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readFully(is, buffer, 0, buffer.length);
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}
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/**
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* Blocks till the required number of bytes have been read from the
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* input stream.
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*
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* @param is the InputStream to read from
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* @param buffer the buffer to store the bytes into
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* @param offset the offset to start storing at
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* @param len the number of bytes to read
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* @param throws EOFException if EOF is reached before all bytes are
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* read.
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* @throws IOException is an error occurs while reading
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*/
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public static final void readFully(InputStream is,
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byte[] buffer, int offset, int len)
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throws IOException {
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int temp;
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while (len > 0) {
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temp = is.read(buffer, offset, len);
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if (temp == -1)
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throw new EOFException("Cannot read all "
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+ len
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+ " bytes needed to form this token!");
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offset += temp;
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len -= temp;
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}
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}
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public static final void debug(String str) {
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System.err.print(str);
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}
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public static final String getHexBytes(byte[] bytes) {
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return getHexBytes(bytes, 0, bytes.length);
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}
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public static final String getHexBytes(byte[] bytes, int len) {
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return getHexBytes(bytes, 0, len);
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}
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public static final String getHexBytes(byte[] bytes, int pos, int len) {
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StringBuffer sb = new StringBuffer();
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for (int i = pos; i < (pos+len); i++) {
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int b1 = (bytes[i]>>4) & 0x0f;
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int b2 = bytes[i] & 0x0f;
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sb.append(Integer.toHexString(b1));
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sb.append(Integer.toHexString(b2));
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sb.append(' ');
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}
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return sb.toString();
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}
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}
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