wicket/src/main/java/org/apache/wicket/util/crypt/Base64UrlSafe.java - wicket - Git at Google

 /*
  * Licensed to the Apache Software Foundation (ASF) under one or more
  * contributor license agreements.  See the NOTICE file distributed with
  * this work for additional information regarding copyright ownership.
  * The ASF licenses this file to You 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.wicket.util.crypt;

 /**
  * Provides Base64 encoding and decoding with URL and filename safe alphabet as defined by RFC 3548,
  * section 4.
  * <p/>
  * This Base64 encoder is modified to meet URL requirements. The changes are: '+' => '*', '/' =>
  * '-', and no padding.
  * <p/>
  * This class is taken from the Apache commons-codec, and adjusted to fit the Wicket framework's
  * needs, especially external dependencies have been removed.
  * </p>
  * <p/>
  * This class implements section <cite>4. Base 64 Encoding with URL and Filename Safe
  * Alphabet</cite> from RFC 3548 <cite>The Base16, Base32, and Base64 Data Encodings</cite> by Simon
  * Josefsson.
  * </p>
  *
  * @author Apache Software Foundation
  * @author Juergen Donnerstag
  *
  * @since 1.2
  */
 public class Base64UrlSafe
 {
 	/**
 	 * The base length.
 	 */
 	static final int BASELENGTH = 255;

 	/**
 	 * Lookup length.
 	 */
 	static final int LOOKUPLENGTH = 64;

 	/**
 	 * Used to calculate the number of bits in a byte.
 	 */
 	static final int EIGHTBIT = 8;

 	/**
 	 * Used when encoding something which has fewer than 24 bits.
 	 */
 	static final int SIXTEENBIT = 16;

 	/**
 	 * Used to determine how many bits data contains.
 	 */
 	static final int TWENTYFOURBITGROUP = 24;

 	/**
 	 * Used to get the number of Quadruples.
 	 */
 	static final int FOURBYTE = 4;

 	/**
 	 * Used to test the sign of a byte.
 	 */
 	static final int SIGN = -128;

 	/**
 	 * Contains the Base64 values <code>0</code> through <code>63</code> accessed by using character
 	 * encodings as indices.
 	 * <p/>
 	 * For example, <code>base64Alphabet['+']</code> returns <code>62</code>.
 	 * </p>
 	 * <p/>
 	 * The value of undefined encodings is <code>-1</code>.
 	 * </p>
 	 */
 	private static byte[] base64Alphabet = new byte[BASELENGTH];

 	/**
 	 * <p/>
 	 * Contains the Base64 encodings <code>A</code> through <code>Z</code>, followed by
 	 * <code>a</code> through <code>z</code>, followed by <code>0</code> through <code>9</code>,
 	 * followed by <code>+</code>, and <code>/</code>.
 	 * </p>
 	 * <p/>
 	 * This array is accessed by using character values as indices.
 	 * </p>
 	 * <p/>
 	 * For example, <code>lookUpBase64Alphabet[62] </code> returns <code>'+'</code>.
 	 * </p>
 	 */
 	private static byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];

 	// Populating the lookup and character arrays
 	static
 	{
 		for (int i = 0; i < BASELENGTH; i++)
 		{
 			base64Alphabet[i] = (byte)-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] = (byte)('A' + i);
 		}

 		for (int i = 26, j = 0; i <= 51; i++, j++)
 		{
 			lookUpBase64Alphabet[i] = (byte)('a' + j);
 		}

 		for (int i = 52, j = 0; i <= 61; i++, j++)
 		{
 			lookUpBase64Alphabet[i] = (byte)('0' + j);
 		}

 		lookUpBase64Alphabet[62] = (byte)'*';
 		lookUpBase64Alphabet[63] = (byte)'-';
 	}

 	/**
 	 * Returns whether or not the <code>octet</code> is in the base 64 alphabet.
 	 *
 	 * @param octet
 	 *            The value to test
 	 * @return <code>true</code> if the value is defined in the the base 64 alphabet,
 	 *         <code>false</code> otherwise.
 	 */
 	private static boolean isBase64(byte octet)
 	{
 		if (octet < 0 || base64Alphabet[octet] == -1)
 		{
 			return false;
 		}
 		else
 		{
 			return true;
 		}
 	}

 	/**
 	 * Tests a given byte array to see if it contains only valid characters within the Base64
 	 * alphabet.
 	 *
 	 * @param arrayOctect
 	 *            byte array to test
 	 * @return <code>true</code> if all bytes are valid characters in the Base64 alphabet or if the
 	 *         byte array is empty; false, otherwise
 	 */
 	public static boolean isArrayByteBase64(byte[] arrayOctect)
 	{
 		arrayOctect = discardWhitespace(arrayOctect);

 		int length = arrayOctect.length;
 		if (length == 0)
 		{
 			// shouldn't a 0 length array be valid base64 data?
 			// return false;
 			return true;
 		}
 		for (int i = 0; i < length; i++)
 		{
 			if (!isBase64(arrayOctect[i]))
 			{
 				return false;
 			}
 		}
 		return true;
 	}

 	/**
 	 * Decodes an Object using the base64 algorithm. This method is provided in order to satisfy the
 	 * requirements of the Decoder interface, and will throw a DecoderException if the supplied
 	 * object is not of type byte[].
 	 *
 	 * @param pObject
 	 *            Object to decode
 	 * @return An object (of type byte[]) containing the binary data which corresponds to the byte[]
 	 *         supplied.
 	 * @throws IllegalArgumentException
 	 *             if the parameter supplied is not of type byte[]
 	 */
 	public Object decode(Object pObject)
 	{
 		if (!(pObject instanceof byte[]))
 		{
 			throw new IllegalArgumentException(
 				"Parameter supplied to Base64 decode is not a byte[]");
 		}
 		return decode((byte[])pObject);
 	}

 	/**
 	 * Decodes a byte[] containing containing characters in the Base64 alphabet.
 	 *
 	 * @param pArray
 	 *            A byte array containing Base64 character data
 	 * @return a byte array containing binary data
 	 */
 	public byte[] decode(byte[] pArray)
 	{
 		return decodeBase64(pArray);
 	}

 	/**
 	 * Encodes binary data using the base64 algorithm.
 	 *
 	 * @param binaryData
 	 *            Array containing binary data to encode.
 	 * @return Base64-encoded data.
 	 */
 	public static byte[] encodeBase64(byte[] binaryData)
 	{
 		int lengthDataBits = binaryData.length * EIGHTBIT;
 		int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
 		int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
 		byte encodedData[] = null;
 		int encodedDataLength = 0;

 		if (fewerThan24bits != 0)
 		{
 			// data not divisible by 24 bit
 			encodedDataLength = (numberTriplets + 1) * 4;
 		}
 		else
 		{
 			// 16 or 8 bit
 			encodedDataLength = numberTriplets * 4;
 		}

 		if (fewerThan24bits == EIGHTBIT)
 		{
 			encodedDataLength -= 2;
 		}
 		else if (fewerThan24bits == SIXTEENBIT)
 		{
 			encodedDataLength -= 1;
 		}

 		encodedData = new byte[encodedDataLength];

 		byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;

 		int encodedIndex = 0;
 		int dataIndex = 0;
 		int i = 0;

 		// log.debug("number of triplets = " + numberTriplets);
 		for (i = 0; i < numberTriplets; i++)
 		{
 			dataIndex = i * 3;
 			b1 = binaryData[dataIndex];
 			b2 = binaryData[dataIndex + 1];
 			b3 = binaryData[dataIndex + 2];

 			// log.debug("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);

 			encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
 			// log.debug( "val2 = " + val2 );
 			// log.debug( "k4 = " + (k<<4) );
 			// log.debug( "vak = " + (val2 | (k<<4)) );
 			encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 | (k << 4)];
 			encodedData[encodedIndex + 2] = lookUpBase64Alphabet[(l << 2) | val3];
 			encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];

 			encodedIndex += 4;
 		}

 		// form integral number of 6-bit groups
 		dataIndex = i * 3;

 		if (fewerThan24bits == EIGHTBIT)
 		{
 			b1 = binaryData[dataIndex];
 			k = (byte)(b1 & 0x03);
 			// log.debug("b1=" + b1);
 			// log.debug("b1<<2 = " + (b1>>2) );
 			byte val1 = ((b1 & SIGN) == 0) ? (byte)(b1 >> 2) : (byte)((b1) >> 2 ^ 0xc0);
 			encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
 			encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];
 		}
 		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 + 1] = lookUpBase64Alphabet[val2 | (k << 4)];
 			encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];
 		}

 		return encodedData;
 	}

 	/**
 	 * Decodes Base64 data into octets
 	 *
 	 * @param base64Data
 	 *            Byte array containing Base64 data
 	 * @return Array containing decoded data.
 	 */
 	public static byte[] decodeBase64(byte[] base64Data)
 	{
 		// RFC 2045 requires that we discard ALL non-Base64 characters
 		base64Data = discardNonBase64(base64Data);

 		// handle the edge case, so we don't have to worry about it later
 		if (base64Data.length == 0)
 		{
 			return new byte[0];
 		}

 		int numberQuadruple = (base64Data.length + 3) / FOURBYTE;
 		byte decodedData[] = new byte[base64Data.length - numberQuadruple];
 		byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;

 		// Throw away anything not in base64Data
 		int encodedIndex = 0;
 		int dataIndex = 0;

 		for (int i = 0; i < numberQuadruple; i++)
 		{
 			dataIndex = i * 4;

 			b1 = base64Alphabet[base64Data[dataIndex]];
 			b2 = base64Alphabet[base64Data[dataIndex + 1]];

 			if ((dataIndex + 3) < base64Data.length)
 			{
 				// No PAD e.g 3cQl
 				b3 = base64Alphabet[base64Data[dataIndex + 2]];
 				b4 = base64Alphabet[base64Data[dataIndex + 3]];

 				decodedData[encodedIndex] = (byte)(b1 << 2 | b2 >> 4);
 				decodedData[encodedIndex + 1] = (byte)(((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
 				decodedData[encodedIndex + 2] = (byte)(b3 << 6 | b4);
 			}
 			else if ((dataIndex + 2) < base64Data.length)
 			{
 				// One PAD e.g. 3cQ[Pad]
 				b3 = base64Alphabet[base64Data[dataIndex + 2]];

 				decodedData[encodedIndex] = (byte)(b1 << 2 | b2 >> 4);
 				decodedData[encodedIndex + 1] = (byte)(((b2 & 0xf) << 4) | ((b3 >> 2) & 0xf));
 			}
 			else if ((dataIndex + 1) < base64Data.length)
 			{
 				// Two PAD e.g. 3c[Pad][Pad]
 				decodedData[encodedIndex] = (byte)(b1 << 2 | b2 >> 4);
 			}
 			encodedIndex += 3;
 		}
 		return decodedData;
 	}

 	/**
 	 * Discards any whitespace from a base-64 encoded block.
 	 *
 	 * @param data
 	 *            The base-64 encoded data to discard the whitespace from.
 	 * @return The data, less whitespace (see RFC 2045).
 	 */
 	static byte[] discardWhitespace(byte[] data)
 	{
 		byte groomedData[] = new byte[data.length];
 		int bytesCopied = 0;

 		for (int i = 0; i < data.length; i++)
 		{
 			switch (data[i])
 			{
 				case (byte)' ' :
 				case (byte)'\n' :
 				case (byte)'\r' :
 				case (byte)'\t' :
 					break;
 				default :
 					groomedData[bytesCopied++] = data[i];
 			}
 		}

 		byte packedData[] = new byte[bytesCopied];

 		System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);

 		return packedData;
 	}

 	/**
 	 * Discards any characters outside of the base64 alphabet, per the requirements on page 25 of
 	 * RFC 2045 - "Any characters outside of the base64 alphabet are to be ignored in base64 encoded
 	 * data."
 	 *
 	 * @param data
 	 *            The base-64 encoded data to groom
 	 * @return The data, less non-base64 characters (see RFC 2045).
 	 */
 	static byte[] discardNonBase64(byte[] data)
 	{
 		byte groomedData[] = new byte[data.length];
 		int bytesCopied = 0;

 		for (int i = 0; i < data.length; i++)
 		{
 			if (isBase64(data[i]))
 			{
 				groomedData[bytesCopied++] = data[i];
 			}
 		}

 		byte packedData[] = new byte[bytesCopied];

 		System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);

 		return packedData;
 	}

 	// Implementation of the Encoder Interface

 	/**
 	 * Encodes an Object using the base64 algorithm. This method is provided in order to satisfy the
 	 * requirements of the Encoder interface, and will throw an EncoderException if the supplied
 	 * object is not of type byte[].
 	 *
 	 * @param pObject
 	 *            Object to encode
 	 * @return An object (of type byte[]) containing the base64 encoded data which corresponds to
 	 *         the byte[] supplied.
 	 * @throws IllegalArgumentException
 	 *             if the parameter supplied is not of type byte[]
 	 */
 	public Object encode(Object pObject)
 	{
 		if (!(pObject instanceof byte[]))
 		{
 			throw new IllegalArgumentException(
 				"Parameter supplied to Base64 encode is not a byte[]");
 		}
 		return encode((byte[])pObject);
 	}

 	/**
 	 * Encodes a byte[] containing binary data, into a byte[] containing characters in the Base64
 	 * alphabet.
 	 *
 	 * @param pArray
 	 *            a byte array containing binary data
 	 * @return A byte array containing only Base64 character data
 	 */
 	public byte[] encode(byte[] pArray)
 	{
 		return encodeBase64(pArray);
 	}
 }
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You 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.wicket.util.crypt;

	/**
	* Provides Base64 encoding and decoding with URL and filename safe alphabet as defined by RFC 3548,
	* section 4.
	* <p/>
	* This Base64 encoder is modified to meet URL requirements. The changes are: '+' => '*', '/' =>
	* '-', and no padding.
	* <p/>
	* This class is taken from the Apache commons-codec, and adjusted to fit the Wicket framework's
	* needs, especially external dependencies have been removed.
	* </p>
	* <p/>
	* This class implements section <cite>4. Base 64 Encoding with URL and Filename Safe
	* Alphabet</cite> from RFC 3548 <cite>The Base16, Base32, and Base64 Data Encodings</cite> by Simon
	* Josefsson.
	* </p>
	*
	* @author Apache Software Foundation
	* @author Juergen Donnerstag
	*
	* @since 1.2
	*/
	public class Base64UrlSafe
	{
	/**
	* The base length.
	*/
	static final int BASELENGTH = 255;

	/**
	* Lookup length.
	*/
	static final int LOOKUPLENGTH = 64;

	/**
	* Used to calculate the number of bits in a byte.
	*/
	static final int EIGHTBIT = 8;

	/**
	* Used when encoding something which has fewer than 24 bits.
	*/
	static final int SIXTEENBIT = 16;

	/**
	* Used to determine how many bits data contains.
	*/
	static final int TWENTYFOURBITGROUP = 24;

	/**
	* Used to get the number of Quadruples.
	*/
	static final int FOURBYTE = 4;

	/**
	* Used to test the sign of a byte.
	*/
	static final int SIGN = -128;

	/**
	* Contains the Base64 values <code>0</code> through <code>63</code> accessed by using character
	* encodings as indices.
	* <p/>
	* For example, <code>base64Alphabet['+']</code> returns <code>62</code>.
	* </p>
	* <p/>
	* The value of undefined encodings is <code>-1</code>.
	* </p>
	*/
	private static byte[] base64Alphabet = new byte[BASELENGTH];

	/**
	* <p/>
	* Contains the Base64 encodings <code>A</code> through <code>Z</code>, followed by
	* <code>a</code> through <code>z</code>, followed by <code>0</code> through <code>9</code>,
	* followed by <code>+</code>, and <code>/</code>.
	* </p>
	* <p/>
	* This array is accessed by using character values as indices.
	* </p>
	* <p/>
	* For example, <code>lookUpBase64Alphabet[62] </code> returns <code>'+'</code>.
	* </p>
	*/
	private static byte[] lookUpBase64Alphabet = new byte[LOOKUPLENGTH];

	// Populating the lookup and character arrays
	static
	{
	for (int i = 0; i < BASELENGTH; i++)
	{
	base64Alphabet[i] = (byte)-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] = (byte)('A' + i);
	}

	for (int i = 26, j = 0; i <= 51; i++, j++)
	{
	lookUpBase64Alphabet[i] = (byte)('a' + j);
	}

	for (int i = 52, j = 0; i <= 61; i++, j++)
	{
	lookUpBase64Alphabet[i] = (byte)('0' + j);
	}

	lookUpBase64Alphabet[62] = (byte)'*';
	lookUpBase64Alphabet[63] = (byte)'-';
	}

	/**
	* Returns whether or not the <code>octet</code> is in the base 64 alphabet.
	*
	* @param octet
	* The value to test
	* @return <code>true</code> if the value is defined in the the base 64 alphabet,
	* <code>false</code> otherwise.
	*/
	private static boolean isBase64(byte octet)
	{
	if (octet < 0 \|\| base64Alphabet[octet] == -1)
	{
	return false;
	}
	else
	{
	return true;
	}
	}

	/**
	* Tests a given byte array to see if it contains only valid characters within the Base64
	* alphabet.
	*
	* @param arrayOctect
	* byte array to test
	* @return <code>true</code> if all bytes are valid characters in the Base64 alphabet or if the
	* byte array is empty; false, otherwise
	*/
	public static boolean isArrayByteBase64(byte[] arrayOctect)
	{
	arrayOctect = discardWhitespace(arrayOctect);

	int length = arrayOctect.length;
	if (length == 0)
	{
	// shouldn't a 0 length array be valid base64 data?
	// return false;
	return true;
	}
	for (int i = 0; i < length; i++)
	{
	if (!isBase64(arrayOctect[i]))
	{
	return false;
	}
	}
	return true;
	}

	/**
	* Decodes an Object using the base64 algorithm. This method is provided in order to satisfy the
	* requirements of the Decoder interface, and will throw a DecoderException if the supplied
	* object is not of type byte[].
	*
	* @param pObject
	* Object to decode
	* @return An object (of type byte[]) containing the binary data which corresponds to the byte[]
	* supplied.
	* @throws IllegalArgumentException
	* if the parameter supplied is not of type byte[]
	*/
	public Object decode(Object pObject)
	{
	if (!(pObject instanceof byte[]))
	{
	throw new IllegalArgumentException(
	"Parameter supplied to Base64 decode is not a byte[]");
	}
	return decode((byte[])pObject);
	}

	/**
	* Decodes a byte[] containing containing characters in the Base64 alphabet.
	*
	* @param pArray
	* A byte array containing Base64 character data
	* @return a byte array containing binary data
	*/
	public byte[] decode(byte[] pArray)
	{
	return decodeBase64(pArray);
	}

	/**
	* Encodes binary data using the base64 algorithm.
	*
	* @param binaryData
	* Array containing binary data to encode.
	* @return Base64-encoded data.
	*/
	public static byte[] encodeBase64(byte[] binaryData)
	{
	int lengthDataBits = binaryData.length * EIGHTBIT;
	int fewerThan24bits = lengthDataBits % TWENTYFOURBITGROUP;
	int numberTriplets = lengthDataBits / TWENTYFOURBITGROUP;
	byte encodedData[] = null;
	int encodedDataLength = 0;

	if (fewerThan24bits != 0)
	{
	// data not divisible by 24 bit
	encodedDataLength = (numberTriplets + 1) * 4;
	}
	else
	{
	// 16 or 8 bit
	encodedDataLength = numberTriplets * 4;
	}

	if (fewerThan24bits == EIGHTBIT)
	{
	encodedDataLength -= 2;
	}
	else if (fewerThan24bits == SIXTEENBIT)
	{
	encodedDataLength -= 1;
	}

	encodedData = new byte[encodedDataLength];

	byte k = 0, l = 0, b1 = 0, b2 = 0, b3 = 0;

	int encodedIndex = 0;
	int dataIndex = 0;
	int i = 0;

	// log.debug("number of triplets = " + numberTriplets);
	for (i = 0; i < numberTriplets; i++)
	{
	dataIndex = i * 3;
	b1 = binaryData[dataIndex];
	b2 = binaryData[dataIndex + 1];
	b3 = binaryData[dataIndex + 2];

	// log.debug("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);

	encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
	// log.debug( "val2 = " + val2 );
	// log.debug( "k4 = " + (k<<4) );
	// log.debug( "vak = " + (val2 \| (k<<4)) );
	encodedData[encodedIndex + 1] = lookUpBase64Alphabet[val2 \| (k << 4)];
	encodedData[encodedIndex + 2] = lookUpBase64Alphabet[(l << 2) \| val3];
	encodedData[encodedIndex + 3] = lookUpBase64Alphabet[b3 & 0x3f];

	encodedIndex += 4;
	}

	// form integral number of 6-bit groups
	dataIndex = i * 3;

	if (fewerThan24bits == EIGHTBIT)
	{
	b1 = binaryData[dataIndex];
	k = (byte)(b1 & 0x03);
	// log.debug("b1=" + b1);
	// log.debug("b1<<2 = " + (b1>>2) );
	byte val1 = ((b1 & SIGN) == 0) ? (byte)(b1 >> 2) : (byte)((b1) >> 2 ^ 0xc0);
	encodedData[encodedIndex] = lookUpBase64Alphabet[val1];
	encodedData[encodedIndex + 1] = lookUpBase64Alphabet[k << 4];
	}
	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 + 1] = lookUpBase64Alphabet[val2 \| (k << 4)];
	encodedData[encodedIndex + 2] = lookUpBase64Alphabet[l << 2];
	}

	return encodedData;
	}

	/**
	* Decodes Base64 data into octets
	*
	* @param base64Data
	* Byte array containing Base64 data
	* @return Array containing decoded data.
	*/
	public static byte[] decodeBase64(byte[] base64Data)
	{
	// RFC 2045 requires that we discard ALL non-Base64 characters
	base64Data = discardNonBase64(base64Data);

	// handle the edge case, so we don't have to worry about it later
	if (base64Data.length == 0)
	{
	return new byte[0];
	}

	int numberQuadruple = (base64Data.length + 3) / FOURBYTE;
	byte decodedData[] = new byte[base64Data.length - numberQuadruple];
	byte b1 = 0, b2 = 0, b3 = 0, b4 = 0;

	// Throw away anything not in base64Data
	int encodedIndex = 0;
	int dataIndex = 0;

	for (int i = 0; i < numberQuadruple; i++)
	{
	dataIndex = i * 4;

	b1 = base64Alphabet[base64Data[dataIndex]];
	b2 = base64Alphabet[base64Data[dataIndex + 1]];

	if ((dataIndex + 3) < base64Data.length)
	{
	// No PAD e.g 3cQl
	b3 = base64Alphabet[base64Data[dataIndex + 2]];
	b4 = base64Alphabet[base64Data[dataIndex + 3]];

	decodedData[encodedIndex] = (byte)(b1 << 2 \| b2 >> 4);
	decodedData[encodedIndex + 1] = (byte)(((b2 & 0xf) << 4) \| ((b3 >> 2) & 0xf));
	decodedData[encodedIndex + 2] = (byte)(b3 << 6 \| b4);
	}
	else if ((dataIndex + 2) < base64Data.length)
	{
	// One PAD e.g. 3cQ[Pad]
	b3 = base64Alphabet[base64Data[dataIndex + 2]];

	decodedData[encodedIndex] = (byte)(b1 << 2 \| b2 >> 4);
	decodedData[encodedIndex + 1] = (byte)(((b2 & 0xf) << 4) \| ((b3 >> 2) & 0xf));
	}
	else if ((dataIndex + 1) < base64Data.length)
	{
	// Two PAD e.g. 3c[Pad][Pad]
	decodedData[encodedIndex] = (byte)(b1 << 2 \| b2 >> 4);
	}
	encodedIndex += 3;
	}
	return decodedData;
	}

	/**
	* Discards any whitespace from a base-64 encoded block.
	*
	* @param data
	* The base-64 encoded data to discard the whitespace from.
	* @return The data, less whitespace (see RFC 2045).
	*/
	static byte[] discardWhitespace(byte[] data)
	{
	byte groomedData[] = new byte[data.length];
	int bytesCopied = 0;

	for (int i = 0; i < data.length; i++)
	{
	switch (data[i])
	{
	case (byte)' ' :
	case (byte)'\n' :
	case (byte)'\r' :
	case (byte)'\t' :
	break;
	default :
	groomedData[bytesCopied++] = data[i];
	}
	}

	byte packedData[] = new byte[bytesCopied];

	System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);

	return packedData;
	}

	/**
	* Discards any characters outside of the base64 alphabet, per the requirements on page 25 of
	* RFC 2045 - "Any characters outside of the base64 alphabet are to be ignored in base64 encoded
	* data."
	*
	* @param data
	* The base-64 encoded data to groom
	* @return The data, less non-base64 characters (see RFC 2045).
	*/
	static byte[] discardNonBase64(byte[] data)
	{
	byte groomedData[] = new byte[data.length];
	int bytesCopied = 0;

	for (int i = 0; i < data.length; i++)
	{
	if (isBase64(data[i]))
	{
	groomedData[bytesCopied++] = data[i];
	}
	}

	byte packedData[] = new byte[bytesCopied];

	System.arraycopy(groomedData, 0, packedData, 0, bytesCopied);

	return packedData;
	}

	// Implementation of the Encoder Interface

	/**
	* Encodes an Object using the base64 algorithm. This method is provided in order to satisfy the
	* requirements of the Encoder interface, and will throw an EncoderException if the supplied
	* object is not of type byte[].
	*
	* @param pObject
	* Object to encode
	* @return An object (of type byte[]) containing the base64 encoded data which corresponds to
	* the byte[] supplied.
	* @throws IllegalArgumentException
	* if the parameter supplied is not of type byte[]
	*/
	public Object encode(Object pObject)
	{
	if (!(pObject instanceof byte[]))
	{
	throw new IllegalArgumentException(
	"Parameter supplied to Base64 encode is not a byte[]");
	}
	return encode((byte[])pObject);
	}

	/**
	* Encodes a byte[] containing binary data, into a byte[] containing characters in the Base64
	* alphabet.
	*
	* @param pArray
	* a byte array containing binary data
	* @return A byte array containing only Base64 character data
	*/
	public byte[] encode(byte[] pArray)
	{
	return encodeBase64(pArray);
	}
	}