| Base64Encoder.java |
/*
* JBoss, the OpenSource J2EE webOS
*
* Distributable under LGPL license.
* See terms of license at gnu.org.
*/
package org.jboss.security; // for the time being ...
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.UnsupportedEncodingException;
/**
* BASE64 encoder implementation.
* Provides encoding methods, using the BASE64 encoding rules, as defined
* in the MIME specification, <a href="http://ietf.org/rfc/rfc1521.txt">rfc1521</a>.
*
*
* This class is a modified version based on code
* obtained from the w3 consortium website,
* which is subject to their generic copyright notice:
*
* <dl>
* <dd><a href="http://www.w3.org/Consortium/Legal/">Copyright</a> © [$date-of-software] <a
* HREF="http://www.w3.org/">World Wide Web Consortium</a>, (<a
* HREF="http://www.lcs.mit.edu/">Massachusetts Institute of Technology</a>, <a
* HREF="http://www.inria.fr/">Institut National de Recherche en Informatique et en
* Automatique</a>, <a HREF="http://www.keio.ac.jp/">Keio University</a>). All Rights
* Reserved. This program is distributed under the <a
* HREF="http://www.w3.org/Consortium/Legal/copyright-software-19980720.html">W3C's Software
* Intellectual Property License</a>. This program is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See W3C License <a
* href="http://www.w3.org/Consortium/Legal/">http://www.w3.org/Consortium/Legal/</a> for
* more details. </dd>
*</dl>
*
*
*/
public final class Base64Encoder
{
private static final int BUFFER_SIZE = 1024 ;
private static final byte encoding[] =
{
(byte) 'A', (byte) 'B', (byte) 'C', (byte) 'D',
(byte) 'E', (byte) 'F', (byte) 'G', (byte) 'H', // 0-7
(byte) 'I', (byte) 'J', (byte) 'K', (byte) 'L',
(byte) 'M', (byte) 'N', (byte) 'O', (byte) 'P', // 8-15
(byte) 'Q', (byte) 'R', (byte) 'S', (byte) 'T',
(byte) 'U', (byte) 'V', (byte) 'W', (byte) 'X', // 16-23
(byte) 'Y', (byte) 'Z', (byte) 'a', (byte) 'b',
(byte) 'c', (byte) 'd', (byte) 'e', (byte) 'f', // 24-31
(byte) 'g', (byte) 'h', (byte) 'i', (byte) 'j',
(byte) 'k', (byte) 'l', (byte) 'm', (byte) 'n', // 32-39
(byte) 'o', (byte) 'p', (byte) 'q', (byte) 'r',
(byte) 's', (byte) 't', (byte) 'u', (byte) 'v', // 40-47
(byte) 'w', (byte) 'x', (byte) 'y', (byte) 'z',
(byte) '0', (byte) '1', (byte) '2', (byte) '3', // 48-55
(byte) '4', (byte) '5', (byte) '6', (byte) '7',
(byte) '8', (byte) '9', (byte) '+', (byte) '/', // 56-63
(byte) '=' // 64
};
/**
* Encodes data from supplied input to output.
* @param in The input stream to be encoded.
* @param out The output stream, to write encoded data to.
*/
public static void encode(InputStream in, OutputStream out) throws IOException
{
process(in, out);
}
/**
* Encode the supplied byte array and write the encoded
* data to the OutputStream <i>out</i>.
*/
public static void encode(byte input[], OutputStream out) throws IOException
{
ByteArrayInputStream in = new ByteArrayInputStream(input);
process(in, out);
}
/**
* Encode the given string,and return the encoded version as a string.
*
* @return A String, representing the encoded content of the input String.
*/
public static String encode(String input) throws IOException
{
byte bytes[] ;
bytes = input.getBytes("ISO-8859-1");
return encode (bytes);
}
/**
* Encode the given byte array and return the result as a string.
*/
public static String encode(byte bytes[]) throws IOException
{
ByteArrayInputStream in = new ByteArrayInputStream(bytes);
ByteArrayOutputStream out = new ByteArrayOutputStream();
process(in, out);
return out.toString("ISO-8859-1");
}
/**
* Run with one argument, prints the encoded version of it.
* With two, the second is assumed to be the name of a MessageDigest to
* be applied to the string before encoding (useful for generating
* password hashes).
* <p>
* Alternatively, use the openssl utility, for example:
* <p>
* echo -n "password" | openssl dgst -sha1 -binary | openssl base64
*
*/
public static void main (String args[]) throws Exception
{
if(args.length == 1)
{
System.out.println ("["+ Base64Encoder.encode(args[0])+"]");
// joe:eoj -> am9lOmVvag==
// 12345678:87654321 -> MTIzNDU2Nzg6ODc2NTQzMjE=
}
else if (args.length == 2)
{
byte[] hash = java.security.MessageDigest.getInstance(args[1]).digest(args[0].getBytes());
System.out.println ("["+ Base64Encoder.encode(hash)+"]");
}
else
{
System.out.println("Usage: Base64Encoder <string> <optional hash algorithm>");
}
}
// Private ----------------------------------------------------------------
private static int get1(byte buf[], int off)
{
return (buf[off] & 0xfc) >> 2 ;
}
private static int get2(byte buf[], int off)
{
return ((buf[off]&0x3) << 4) | ((buf[off+1]&0xf0) >>> 4) ;
}
private static int get3(byte buf[], int off)
{
return ((buf[off+1] & 0x0f) << 2) | ((buf[off+2] & 0xc0) >>> 6) ;
}
private static int get4(byte buf[], int off)
{
return buf[off+2] & 0x3f ;
}
/**
* Process the data: encode the input stream to the output stream.
* This method runs through the input stream, encoding it to the output
* stream.
* @exception IOException If we weren't able to access the input stream or
* the output stream.
*/
private static void process(InputStream in, OutputStream out) throws IOException
{
byte buffer[] = new byte[BUFFER_SIZE] ;
int got = -1 ;
int off = 0 ;
int count = 0 ;
while ((got = in.read(buffer, off, BUFFER_SIZE-off)) > 0)
{
if ( got >= 3 )
{
got += off;
off = 0;
while (off + 3 <= got)
{
int c1 = get1(buffer,off);
int c2 = get2(buffer,off);
int c3 = get3(buffer,off);
int c4 = get4(buffer,off);
switch (count)
{
case 73:
out.write(encoding[c1]);
out.write(encoding[c2]);
out.write(encoding[c3]);
out.write ('\n') ;
out.write(encoding[c4]);
count = 1 ;
break ;
case 74:
out.write(encoding[c1]);
out.write(encoding[c2]);
out.write ('\n') ;
out.write(encoding[c3]);
out.write(encoding[c4]) ;
count = 2 ;
break ;
case 75:
out.write(encoding[c1]);
out.write ('\n') ;
out.write(encoding[c2]);
out.write(encoding[c3]);
out.write(encoding[c4]) ;
count = 3 ;
break ;
case 76:
out.write('\n') ;
out.write(encoding[c1]);
out.write(encoding[c2]);
out.write(encoding[c3]);
out.write(encoding[c4]);
count = 4;
break;
default:
out.write(encoding[c1]);
out.write(encoding[c2]);
out.write(encoding[c3]);
out.write(encoding[c4]);
count += 4;
break;
}
off += 3;
}
// Copy remaining bytes to beginning of buffer:
for ( int i = 0 ; i < 3 ;i++)
buffer[i] = (i < got-off) ? buffer[off+i] : ((byte) 0);
off = got-off ;
}
else
{
// Total read amount is less then 3 bytes:
off += got;
}
}
// Manage the last bytes, from 0 to off:
switch (off) {
case 1:
out.write(encoding[get1(buffer, 0)]);
out.write(encoding[get2(buffer, 0)]);
out.write('=');
out.write('=');
break ;
case 2:
out.write(encoding[get1(buffer, 0)]);
out.write(encoding[get2(buffer, 0)]);
out.write(encoding[get3(buffer, 0)]);
out.write('=');
}
return;
}
}
| Base64Encoder.java |