| package org.bouncycastle.util.encoders; |
| |
| import java.io.ByteArrayOutputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| import org.bouncycastle.util.Strings; |
| |
| /** |
| * Utility class for converting Base64 data to bytes and back again. |
| */ |
| public class Base64 |
| { |
| private static final Encoder encoder = new Base64Encoder(); |
| |
| public static String toBase64String( |
| byte[] data) |
| { |
| return toBase64String(data, 0, data.length); |
| } |
| |
| public static String toBase64String( |
| byte[] data, |
| int off, |
| int length) |
| { |
| byte[] encoded = encode(data, off, length); |
| return Strings.fromByteArray(encoded); |
| } |
| |
| /** |
| * 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) |
| { |
| return encode(data, 0, data.length); |
| } |
| |
| /** |
| * 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 off, |
| int length) |
| { |
| int len = (length + 2) / 3 * 4; |
| ByteArrayOutputStream bOut = new ByteArrayOutputStream(len); |
| |
| try |
| { |
| encoder.encode(data, off, length, bOut); |
| } |
| catch (Exception e) |
| { |
| throw new EncoderException("exception encoding base64 string: " + e.getMessage(), 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 (Exception e) |
| { |
| throw new DecoderException("unable to decode base64 data: " + e.getMessage(), 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 (Exception e) |
| { |
| throw new DecoderException("unable to decode base64 string: " + e.getMessage(), 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); |
| } |
| } |