org.apache.ws.security.util.Base64 Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of wss4j Show documentation
Show all versions of wss4j Show documentation
The Apache WSS4J project provides a Java implementation of the primary security standards
for Web Services, namely the OASIS Web Services Security (WS-Security) specifications
from the OASIS Web Services Security TC.
/*
* Copyright 1999-2004 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 org.apache.ws.security.util;
import org.apache.ws.security.WSSecurityException;
public class Base64 {
/**
* Implementation of MIME's Base64 encoding and decoding conversions.
* Optimized code. (raw version taken from oreilly.jonathan.util,
* and currently org.apache.xerces.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
*/
/**
* {@link org.apache.commons.logging} logging facility
*/
static org.apache.commons.logging.Log log = org.apache.commons.logging.LogFactory
.getLog(Base64.class.getName());
/**
* Field BASE64DEFAULTLENGTH
*/
public static final int BASE64DEFAULTLENGTH = 76;
/**
* Field _base64length
*/
static int _base64length = Base64.BASE64DEFAULTLENGTH;
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 < BASELENGTH; i++) {
base64Alphabet[i] = -1;
}
for (int i = 'Z'; 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] = '/';
}
private Base64() {
// we don't allow instantiation
}
/**
* Encode a byte array and fold lines at the standard 76th character.
*
* @param binaryData byte[] to be base64 encoded
* @return the String with encoded data
*/
public static String encode(byte[] binaryData) {
return encode(binaryData, BASE64DEFAULTLENGTH, false);
}
protected static boolean isWhiteSpace(byte octect) {
return (octect == 0x20 || octect == 0xd || octect == 0xa || octect == 0x9);
}
protected static boolean isPad(byte octect) {
return (octect == PAD);
}
/**
* Encodes hex octects into Base64
*
* @param binaryData Array containing binaryData
* @return Encoded Base64 array
*/
/**
* 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 String encode(byte[] binaryData, int length, boolean wrap) {
if (length < 4) {
length = Integer.MAX_VALUE;
}
if (binaryData == null)
return null;
int lengthDataBits = binaryData.length * EIGHTBIT;
if (lengthDataBits == 0) {
return "";
}
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[];
encodedData = new char[(numberQuartet * 4) + (wrap ? numberLines : 0)];
byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;
int encodedIndex = 0;
int dataIndex = 0;
int tripletsDone = 0;
if (fDebug) {
System.out.println("number of triplets = " + numberTriplets);
}
for (int line = 0; line < numberLines; line++) {
for (int quartet = 0; quartet < quartesPerLine; 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];
tripletsDone++;
}
if (wrap) {
encodedData[encodedIndex++] = 0xa;
}
}
for (; tripletsDone < numberTriplets; tripletsDone++) {
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];
}
// form integral number of 6-bit groups
if (fewerThan24bits == EIGHTBIT) {
b1 = binaryData[dataIndex];
k = (byte) (b1 & 0x03);
if (fDebug) {
System.out.println("b1=" + b1);
System.out.println("b1<<2 = " + (b1 >> 2));
}
byte val1 = ((b1 & SIGN) == 0) ? (byte) (b1 >> 2)
: (byte) ((b1) >> 2 ^ 0xc0);
encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
encodedData[encodedIndex++] = lookUpBase64Alphabet[k << 4];
encodedData[encodedIndex++] = PAD;
encodedData[encodedIndex++] = PAD;
} else if (fewerThan24bits == SIXTEENBIT) {
b1 = binaryData[dataIndex];
b2 = binaryData[dataIndex + 1];
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);
encodedData[encodedIndex++] = lookUpBase64Alphabet[val1];
encodedData[encodedIndex++] = lookUpBase64Alphabet[val2 | (k << 4)];
encodedData[encodedIndex++] = lookUpBase64Alphabet[l << 2];
encodedData[encodedIndex++] = PAD;
}
return new String(encodedData);
}
/**
* Decodes Base64 data into octects
*
* @param encoded String containing Base64 data
* @return Array containing decoded data.
*/
public static byte[] decode(String encoded) throws WSSecurityException {
byte[] base64Data = encoded.getBytes();
// remove white spaces
int len = removeWhiteSpace(base64Data);
if (len % FOURBYTE != 0) {
throw new WSSecurityException("decoding.divisible.four");
//should be divisible by four
}
int numberQuadruple = (len / FOURBYTE);
if (numberQuadruple == 0)
return new byte[0];
byte decodedData[] = null;
byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;
int i = 0;
int encodedIndex = 0;
int dataIndex = 0;
//decodedData = new byte[ (numberQuadruple)*3];
dataIndex = (numberQuadruple - 1) * 4;
encodedIndex = (numberQuadruple - 1) * 3;
//first last bits.
b1 = base64Alphabet[base64Data[dataIndex++]];
b2 = base64Alphabet[base64Data[dataIndex++]];
if ((b1 == -1) || (b2 == -1)) {
throw new WSSecurityException("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 WSSecurityException("decoding.general");
decodedData = new byte[encodedIndex + 1];
decodedData[encodedIndex] = (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 WSSecurityException("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 WSSecurityException("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 WSSecurityException("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;
}
/**
* 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;
}
/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
}
}