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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for Android. Android ships with a stripped-down version of Bouncy Castle - this causes classloader collisions if you try to add an alternative (updated/complete) Bouncy Castle jar. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5.

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package org.spongycastle.util.encoders;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;

/**
 * Convert binary data to and from UrlBase64 encoding.  This is identical to
 * Base64 encoding, except that the padding character is "." and the other 
 * non-alphanumeric characters are "-" and "_" instead of "+" and "/".
 * 

* The purpose of UrlBase64 encoding is to provide a compact encoding of binary * data that is safe for use as an URL parameter. Base64 encoding does not * produce encoded values that are safe for use in URLs, since "/" can be * interpreted as a path delimiter; "+" is the encoded form of a space; and * "=" is used to separate a name from the corresponding value in an URL * parameter. */ public class UrlBase64 { private static final Encoder encoder = new UrlBase64Encoder(); /** * Encode the input data producing a URL safe base 64 encoded byte array. * * @return a byte array containing the URL safe base 64 encoded data. */ public static byte[] encode( byte[] data) { ByteArrayOutputStream bOut = new ByteArrayOutputStream(); try { encoder.encode(data, 0, data.length, bOut); } catch (IOException e) { throw new RuntimeException("exception encoding URL safe base64 string: " + e); } return bOut.toByteArray(); } /** * Encode the byte data writing it to the given output stream. * * @return the number of bytes produced. */ public static int encode( byte[] data, OutputStream out) throws IOException { return encoder.encode(data, 0, data.length, out); } /** * Decode the URL safe base 64 encoded input data - white space will be ignored. * * @return a byte array representing the decoded data. */ public static byte[] decode( byte[] data) { ByteArrayOutputStream bOut = new ByteArrayOutputStream(); try { encoder.decode(data, 0, data.length, bOut); } catch (IOException e) { throw new RuntimeException("exception decoding URL safe base64 string: " + e); } return bOut.toByteArray(); } /** * decode the URL safe base 64 encoded byte data writing it to the given output stream, * whitespace characters will be ignored. * * @return the number of bytes produced. */ public static int decode( byte[] data, OutputStream out) throws IOException { return encoder.decode(data, 0, data.length, out); } /** * decode the URL safe base 64 encoded String data - whitespace will be ignored. * * @return a byte array representing the decoded data. */ public static byte[] decode( String data) { ByteArrayOutputStream bOut = new ByteArrayOutputStream(); try { encoder.decode(data, bOut); } catch (IOException e) { throw new RuntimeException("exception decoding URL safe base64 string: " + e); } return bOut.toByteArray(); } /** * Decode the URL safe base 64 encoded String data writing it to the given output stream, * whitespace characters will be ignored. * * @return the number of bytes produced. */ public static int decode( String data, OutputStream out) throws IOException { return encoder.decode(data, out); } }





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