jdk-1.4/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>octect</code> is in the base 64 alphabet.
      *
      * @param octect 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 octect)
     {
         if (octect < 0 || base64Alphabet[octect] == -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 octects
      *
      * @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, marker0 = 0, marker1 = 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>octect</code> is in the base 64 alphabet.
	*
	* @param octect 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 octect)
	{
	if (octect < 0 \|\| base64Alphabet[octect] == -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 octects
	*
	* @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, marker0 = 0, marker1 = 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);
	}
	}