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/*
* Copyright (c) 1997, 2022 Oracle and/or its affiliates. All rights reserved.
* Copyright 1995-2005 The Apache Software Foundation
*
* 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 com.sun.xml.wss.impl.misc;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import org.apache.xml.security.exceptions.Base64DecodingException;
/**
* Implementation of MIME's Base64 encoding and decoding conversions.
* Optimized code. (raw version taken from oreilly.jonathan.util,
* and currently com.sun.org.apache.xerces.internal.ds.util.Base64)
*
* @author Raul Benito(Of the xerces copy, and little adaptations).
* @author Anli Shundi
* @author Christian Geuer-Pollmann
* @see RFC 2045
* @see org.apache.xml.security.transforms.implementations.TransformBase64Decode
*/
public class Base64 {
/** Field BASE64DEFAULTLENGTH */
public static final int BASE64DEFAULTLENGTH = 76;
/** Field _base64length */
//static int _base64length = Base64.BASE64DEFAULTLENGTH;
private Base64() {
// we don't allow instantiation
}
static private final int BASELENGTH = 255;
static private final int LOOKUPLENGTH = 64;
static private final int TWENTYFOURBITGROUP = 24;
static private final int EIGHTBIT = 8;
static private final int SIXTEENBIT = 16;
static private final int FOURBYTE = 4;
static private final int SIGN = -128;
static private final char PAD = '=';
static private final boolean fDebug = false;
static final private byte [] base64Alphabet = new byte[BASELENGTH];
static final private char [] lookUpBase64Alphabet = new char[LOOKUPLENGTH];
static {
for (int i = 0; i= 'A'; i--) {
base64Alphabet[i] = (byte) (i-'A');
}
for (int i = 'z'; i>= 'a'; i--) {
base64Alphabet[i] = (byte) ( i-'a' + 26);
}
for (int i = '9'; i >= '0'; i--) {
base64Alphabet[i] = (byte) (i-'0' + 52);
}
base64Alphabet['+'] = 62;
base64Alphabet['/'] = 63;
for (int i = 0; i<=25; i++)
lookUpBase64Alphabet[i] = (char)('A'+i);
for (int i = 26, j = 0; i<=51; i++, j++)
lookUpBase64Alphabet[i] = (char)('a'+ j);
for (int i = 52, j = 0; i<=61; i++, j++)
lookUpBase64Alphabet[i] = (char)('0' + j);
lookUpBase64Alphabet[62] = '+';
lookUpBase64Alphabet[63] = '/';
}
protected static final boolean isWhiteSpace(byte octect) {
return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);
}
protected static final boolean isPad(byte octect) {
return (octect == PAD);
}
/**
* Encodes hex octects into Base64
*
* @param binaryData Array containing binaryData
* @return Encoded Base64 array
*/
public char [] encodeData(byte[] binaryData){
return encodeData(binaryData,2046);
//BASE64DEFAULTLENGTH);
}
/**
* Encode a byte array in Base64 format and return an optionally
* wrapped line.
*
* @param binaryData byte[] data to be encoded
* @param length int length of wrapped lines; No wrapping if less than 4.
* @return a String with encoded data
*/
public static char[] encodeData(byte[] binaryData,int length) {
if (length<4) {
length=Integer.MAX_VALUE;
}
if (binaryData == null)
return null;
int lengthDataBits = binaryData.length*EIGHTBIT;
if (lengthDataBits == 0) {
return "".toCharArray();
}
int fewerThan24bits = lengthDataBits%TWENTYFOURBITGROUP;
int numberTriplets = lengthDataBits/TWENTYFOURBITGROUP;
int numberQuartet = fewerThan24bits != 0 ? numberTriplets+1 : numberTriplets;
int quartesPerLine = length/4;
int numberLines = (numberQuartet-1)/quartesPerLine;
char[] encodedData = null;
encodedData = new char[numberQuartet*4+numberLines*2];
byte k=0, l=0, b1=0,b2=0,b3=0;
int encodedIndex = 0;
int dataIndex = 0;
int i = 0;
if (fDebug) {
System.out.println("number of triplets = " + numberTriplets );
}
for (int line = 0; line < numberLines; line++) {
for (int quartet = 0; quartet < 19; quartet++) {
b1 = binaryData[dataIndex++];
b2 = binaryData[dataIndex++];
b3 = binaryData[dataIndex++];
if (fDebug) {
System.out.println( "b1= " + b1 +", b2= " + b2 + ", b3= " + b3 );
}
l = (byte)(b2 & 0x0f);
k = (byte)(b1 & 0x03);
byte val1 = ((b1 & SIGN)==0)?(byte)(b1>>2):(byte)((b1)>>2^0xc0);
byte val2 = ((b2 & SIGN)==0)?(byte)(b2>>4):(byte)((b2)>>4^0xf0);
byte val3 = ((b3 & SIGN)==0)?(byte)(b3>>6):(byte)((b3)>>6^0xfc);
if (fDebug) {
System.out.println( "val2 = " + val2 );
System.out.println( "k4 = " + (k<<4));
System.out.println( "vak = " + (val2 | (k<<4)));
}
encodedData[encodedIndex++] = lookUpBase64Alphabet[ val1 ];
encodedData[encodedIndex++] = lookUpBase64Alphabet[ val2 | ( k<<4 )];
encodedData[encodedIndex++] = lookUpBase64Alphabet[ (l <<2 ) | val3 ];
encodedData[encodedIndex++] = lookUpBase64Alphabet[ b3 & 0x3f ];
i++;
}
encodedData[encodedIndex++] = 0xd;
encodedData[encodedIndex++] = 0xa;
}
for (; i>4 ) ;
} else if (!isPad( d3) && isPad(d4)) { //One PAD e.g. 3cQ[Pad]
if ((b3 & 0x3 ) != 0)//last 2 bits should be zero
throw new Base64DecodingException("decoding.general");
decodedData = new byte[ encodedIndex + 2 ];
decodedData[encodedIndex++] = (byte)( b1 <<2 | b2>>4 );
decodedData[encodedIndex] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
} else {
throw new Base64DecodingException("decoding.general");//an error like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
}
} else {
//No PAD e.g 3cQl
decodedData = new byte[encodedIndex+3];
decodedData[encodedIndex++] = (byte)( b1 <<2 | b2>>4 ) ;
decodedData[encodedIndex++] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
decodedData[encodedIndex++] = (byte)( b3<<6 | b4 );
}
encodedIndex=0;
dataIndex=0;
//the begin
for (i=numberQuadruple-1; i>0; i--) {
b1 = base64Alphabet[base64Data[dataIndex++]];
b2 = base64Alphabet[base64Data[dataIndex++]];
b3 = base64Alphabet[base64Data[dataIndex++]];
b4 = base64Alphabet[base64Data[dataIndex++]];
if ( (b1==-1) ||
(b2==-1) ||
(b3==-1) ||
(b4==-1) ) {
throw new Base64DecodingException("decoding.general");//if found "no data" just return null
}
decodedData[encodedIndex++] = (byte)( b1 <<2 | b2>>4 ) ;
decodedData[encodedIndex++] = (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) );
decodedData[encodedIndex++] = (byte)( b3<<6 | b4 );
}
return decodedData;
}
/**
* Decodes Base64 data into outputstream
*
* @param base64Data Byte array containing Base64 data
* @param os the outputstream
*/
public final static void decode(byte[] base64Data,
OutputStream os) throws Base64DecodingException, IOException {
// remove white spaces
int len = removeWhiteSpace(base64Data);
// int len = base64Data.length;
if (len%FOURBYTE != 0) {
throw new Base64DecodingException("decoding.divisible.four");
//should be divisible by four
}
int numberQuadruple = (len/FOURBYTE );
if (numberQuadruple == 0)
return;
//byte decodedData[] = null;
byte b1=0,b2=0,b3=0, b4=0;
int i = 0;
int dataIndex = 0;
//the begin
for (i=numberQuadruple-1; i>0; i--) {
b1 = base64Alphabet[base64Data[dataIndex++]];
b2 = base64Alphabet[base64Data[dataIndex++]];
b3 = base64Alphabet[base64Data[dataIndex++]];
b4 = base64Alphabet[base64Data[dataIndex++]];
if ( (b1==-1) ||
(b2==-1) ||
(b3==-1) ||
(b4==-1) )
throw new Base64DecodingException("decoding.general");//if found "no data" just return null
os.write((byte)( b1 <<2 | b2>>4 ) );
os.write((byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) ));
os.write( (byte)( b3<<6 | b4 ));
}
b1 = base64Alphabet[base64Data[dataIndex++]];
b2 = base64Alphabet[base64Data[dataIndex++]];
// first last bits.
if ((b1==-1) ||
(b2==-1) ){
throw new Base64DecodingException("decoding.general");//if found "no data" just return null
}
byte d3,d4;
b3= base64Alphabet[d3 = base64Data[dataIndex++]];
b4= base64Alphabet[d4 = base64Data[dataIndex++]];
if ((b3==-1 ) ||
(b4==-1) ) {//Check if they are PAD characters
if (isPad( d3 ) && isPad( d4)) { //Two PAD e.g. 3c[Pad][Pad]
if ((b2 & 0xf) != 0)//last 4 bits should be zero
throw new Base64DecodingException("decoding.general");
os.write( (byte)( b1 <<2 | b2>>4 ) );
} else if (!isPad( d3) && isPad(d4)) { //One PAD e.g. 3cQ[Pad]
if ((b3 & 0x3 ) != 0)//last 2 bits should be zero
throw new Base64DecodingException("decoding.general");
os.write( (byte)( b1 <<2 | b2>>4 ));
os.write( (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) ));
} else {
throw new Base64DecodingException("decoding.general");//an error like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
}
} else {
//No PAD e.g 3cQl
os.write((byte)( b1 <<2 | b2>>4 ) );
os.write( (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) ));
os.write((byte)( b3<<6 | b4 ));
}
}
/**
* Decodes Base64 data into outputstream
*
* @param is containing Base64 data
* @param os the outputstream
*/
public final static void decode(InputStream is,
OutputStream os) throws Base64DecodingException, IOException {
//byte decodedData[] = null;
byte b1=0,b2=0,b3=0, b4=0;
int index=0;
byte []data=new byte[4];
int read;
//the begin
while ((read=is.read())>0) {
byte readed=(byte)read;
if (isWhiteSpace(readed)) {
continue;
}
if (isPad(readed)) {
data[index++]=readed;
if (index==3)
data[index++]=(byte)is.read();
break;
}
if ((data[index++]=readed)==-1) {
throw new Base64DecodingException("decoding.general");//if found "no data" just return null
}
if (index!=4) {
continue;
}
index=0;
b1 = base64Alphabet[data[0]];
b2 = base64Alphabet[data[1]];
b3 = base64Alphabet[data[2]];
b4 = base64Alphabet[data[3]];
os.write((byte)( b1 <<2 | b2>>4 ) );
os.write((byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) ));
os.write( (byte)( b3<<6 | b4 ));
}
byte d1=data[0],d2=data[1],d3=data[2], d4=data[3];
b1 = base64Alphabet[d1];
b2 = base64Alphabet[d2];
b3 = base64Alphabet[ d3 ];
b4 = base64Alphabet[ d4 ];
if ((b3==-1 ) ||
(b4==-1) ) {//Check if they are PAD characters
if (isPad( d3 ) && isPad( d4)) { //Two PAD e.g. 3c[Pad][Pad]
if ((b2 & 0xf) != 0)//last 4 bits should be zero
throw new Base64DecodingException("decoding.general");
os.write( (byte)( b1 <<2 | b2>>4 ) );
} else if (!isPad( d3) && isPad(d4)) { //One PAD e.g. 3cQ[Pad]
b3 = base64Alphabet[ d3 ];
if ((b3 & 0x3 ) != 0)//last 2 bits should be zero
throw new Base64DecodingException("decoding.general");
os.write( (byte)( b1 <<2 | b2>>4 ));
os.write( (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) ));
} else {
throw new Base64DecodingException("decoding.general");//an error like "3c[Pad]r", "3cdX", "3cXd", "3cXX" where X is non data
}
} else {
//No PAD e.g 3cQl
os.write((byte)( b1 <<2 | b2>>4 ) );
os.write( (byte)(((b2 & 0xf)<<4 ) |( (b3>>2) & 0xf) ));
os.write((byte)( b3<<6 | b4 ));
}
}
/**
* remove WhiteSpace from MIME containing encoded Base64 data.
*
* @param data the byte array of base64 data (with WS)
* @return the new length
*/
protected static int removeWhiteSpace(byte[] data) {
if (data == null)
return 0;
// count characters that's not whitespace
int newSize = 0;
int len = data.length;
for (int i = 0; i < len; i++) {
byte dataS=data[i];
if (!isWhiteSpace(dataS))
data[newSize++] = dataS;
}
return newSize;
}
}
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