package com.google.bitcoin.bouncycastle.util.encoders; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.OutputStream; public class Base64 { private static final Encoder encoder = new Base64Encoder(); /** * encode the input data producing a base 64 encoded byte array. * * @return a byte array containing the base 64 encoded data. */ public static byte[] encode( byte[] data) { int len = (data.length + 2) / 3 * 4; ByteArrayOutputStream bOut = new ByteArrayOutputStream(len); try { encoder.encode(data, 0, data.length, bOut); } catch (IOException e) { throw new RuntimeException("exception encoding base64 string: " + e); } return bOut.toByteArray(); } /** * Encode the byte data to base 64 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); } /** * Encode the byte data to base 64 writing it to the given output stream. * * @return the number of bytes produced. */ public static int encode( byte[] data, int off, int length, OutputStream out) throws IOException { return encoder.encode(data, off, length, out); } /** * decode the base 64 encoded input data. It is assumed the input data is valid. * * @return a byte array representing the decoded data. */ public static byte[] decode( byte[] data) { int len = data.length / 4 * 3; ByteArrayOutputStream bOut = new ByteArrayOutputStream(len); try { encoder.decode(data, 0, data.length, bOut); } catch (IOException e) { throw new RuntimeException("exception decoding base64 string: " + e); } return bOut.toByteArray(); } /** * decode the base 64 encoded String data - whitespace will be ignored. * * @return a byte array representing the decoded data. */ public static byte[] decode( String data) { int len = data.length() / 4 * 3; ByteArrayOutputStream bOut = new ByteArrayOutputStream(len); try { encoder.decode(data, bOut); } catch (IOException e) { throw new RuntimeException("exception decoding base64 string: " + e); } return bOut.toByteArray(); } /** * decode the 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); } }