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Kotlin conversion: TeeBCPGInputStream
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2 changed files with 136 additions and 159 deletions
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// SPDX-FileCopyrightText: 2022 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.decryption_verification;
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import java.io.IOException;
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import java.io.InputStream;
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import java.io.OutputStream;
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import org.bouncycastle.bcpg.BCPGInputStream;
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import org.bouncycastle.bcpg.MarkerPacket;
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import org.bouncycastle.bcpg.Packet;
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import org.bouncycastle.openpgp.PGPCompressedData;
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import org.bouncycastle.openpgp.PGPEncryptedDataList;
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import org.bouncycastle.openpgp.PGPException;
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import org.bouncycastle.openpgp.PGPLiteralData;
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import org.bouncycastle.openpgp.PGPOnePassSignature;
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import org.bouncycastle.openpgp.PGPSignature;
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import org.pgpainless.algorithm.OpenPgpPacket;
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import javax.annotation.Nonnull;
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/**
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* Since we need to update signatures with data from the underlying stream, this class is used to tee out the data.
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* Unfortunately we cannot simply override {@link BCPGInputStream#read()} to tee the data out though, since
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* {@link BCPGInputStream#readPacket()} inconsistently calls a mix of {@link BCPGInputStream#read()} and
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* {@link InputStream#read()} of the underlying stream. This would cause the second length byte to get swallowed up.
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*
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* Therefore, this class delegates the teeing to an {@link DelayedTeeInputStream} which wraps the underlying
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* stream. Since calling {@link BCPGInputStream#nextPacketTag()} reads up to and including the next packets tag,
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* we need to delay teeing out that byte to signature verifiers.
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* Hence, the reading methods of the {@link TeeBCPGInputStream} handle pushing this byte to the output stream using
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* {@link DelayedTeeInputStream#squeeze()}.
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*/
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public class TeeBCPGInputStream {
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protected final DelayedTeeInputStream delayedTee;
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// InputStream of OpenPGP packets of the current layer
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protected final BCPGInputStream packetInputStream;
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public TeeBCPGInputStream(BCPGInputStream inputStream, OutputStream outputStream) {
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this.delayedTee = new DelayedTeeInputStream(inputStream, outputStream);
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this.packetInputStream = BCPGInputStream.wrap(delayedTee);
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}
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public OpenPgpPacket nextPacketTag() throws IOException {
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int tag = packetInputStream.nextPacketTag();
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if (tag == -1) {
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return null;
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}
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return OpenPgpPacket.requireFromTag(tag);
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}
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public Packet readPacket() throws IOException {
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return packetInputStream.readPacket();
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}
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public PGPCompressedData readCompressedData() throws IOException {
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delayedTee.squeeze();
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PGPCompressedData compressedData = new PGPCompressedData(packetInputStream);
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return compressedData;
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}
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public PGPLiteralData readLiteralData() throws IOException {
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delayedTee.squeeze();
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return new PGPLiteralData(packetInputStream);
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}
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public PGPEncryptedDataList readEncryptedDataList() throws IOException {
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delayedTee.squeeze();
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return new PGPEncryptedDataList(packetInputStream);
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}
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public PGPOnePassSignature readOnePassSignature() throws PGPException, IOException {
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PGPOnePassSignature onePassSignature = new PGPOnePassSignature(packetInputStream);
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delayedTee.squeeze();
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return onePassSignature;
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}
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public PGPSignature readSignature() throws PGPException, IOException {
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PGPSignature signature = new PGPSignature(packetInputStream);
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delayedTee.squeeze();
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return signature;
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}
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public MarkerPacket readMarker() throws IOException {
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MarkerPacket markerPacket = (MarkerPacket) readPacket();
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delayedTee.squeeze();
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return markerPacket;
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}
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public void close() throws IOException {
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this.packetInputStream.close();
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}
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public static class DelayedTeeInputStream extends InputStream {
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private int last = -1;
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private final InputStream inputStream;
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private final OutputStream outputStream;
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public DelayedTeeInputStream(InputStream inputStream, OutputStream outputStream) {
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this.inputStream = inputStream;
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this.outputStream = outputStream;
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}
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@Override
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public int read() throws IOException {
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if (last != -1) {
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outputStream.write(last);
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}
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try {
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last = inputStream.read();
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return last;
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} catch (IOException e) {
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if (e.getMessage().contains("crc check failed in armored message")) {
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throw e;
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}
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return -1;
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}
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}
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@Override
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public int read(@Nonnull byte[] b, int off, int len) throws IOException {
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if (last != -1) {
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outputStream.write(last);
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}
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int r = inputStream.read(b, off, len);
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if (r > 0) {
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outputStream.write(b, off, r - 1);
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last = b[off + r - 1];
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} else {
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last = -1;
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}
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return r;
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}
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/**
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* Squeeze the last byte out and update the output stream.
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*
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* @throws IOException in case of an IO error
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*/
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public void squeeze() throws IOException {
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if (last != -1) {
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outputStream.write(last);
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}
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last = -1;
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}
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@Override
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public void close() throws IOException {
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inputStream.close();
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outputStream.close();
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}
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}
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}
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@ -0,0 +1,136 @@
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// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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package org.pgpainless.decryption_verification
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import org.bouncycastle.bcpg.BCPGInputStream
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import org.bouncycastle.bcpg.MarkerPacket
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import org.bouncycastle.bcpg.Packet
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import org.bouncycastle.openpgp.PGPCompressedData
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import org.bouncycastle.openpgp.PGPEncryptedDataList
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import org.bouncycastle.openpgp.PGPLiteralData
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import org.bouncycastle.openpgp.PGPOnePassSignature
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import org.bouncycastle.openpgp.PGPSignature
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import org.pgpainless.algorithm.OpenPgpPacket
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import java.io.IOException
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import java.io.InputStream
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import java.io.OutputStream
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/**
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* Since we need to update signatures with data from the underlying stream, this class is used to tee out the data.
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* Unfortunately we cannot simply override [BCPGInputStream.read] to tee the data out though, since
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* [BCPGInputStream.readPacket] inconsistently calls a mix of [BCPGInputStream.read] and
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* [InputStream.read] of the underlying stream. This would cause the second length byte to get swallowed up.
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*
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* Therefore, this class delegates the teeing to an [DelayedTeeInputStream] which wraps the underlying
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* stream. Since calling [BCPGInputStream.nextPacketTag] reads up to and including the next packets tag,
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* we need to delay teeing out that byte to signature verifiers.
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* Hence, the reading methods of the [TeeBCPGInputStream] handle pushing this byte to the output stream using
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* [DelayedTeeInputStream.squeeze].
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*/
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class TeeBCPGInputStream(
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inputStream: BCPGInputStream,
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outputStream: OutputStream) {
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private val delayedTee: DelayedTeeInputStream
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private val packetInputStream: BCPGInputStream
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init {
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delayedTee = DelayedTeeInputStream(inputStream, outputStream)
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packetInputStream = BCPGInputStream(delayedTee)
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}
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fun nextPacketTag(): OpenPgpPacket? {
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return packetInputStream.nextPacketTag().let {
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if (it == -1) null
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else OpenPgpPacket.requireFromTag(it)
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}
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}
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fun readPacket(): Packet = packetInputStream.readPacket()
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fun readCompressedData(): PGPCompressedData {
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delayedTee.squeeze()
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return PGPCompressedData(packetInputStream)
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}
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fun readLiteralData(): PGPLiteralData {
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delayedTee.squeeze()
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return PGPLiteralData(packetInputStream)
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}
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fun readEncryptedDataList(): PGPEncryptedDataList {
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delayedTee.squeeze()
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return PGPEncryptedDataList(packetInputStream)
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}
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fun readOnePassSignature(): PGPOnePassSignature {
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return PGPOnePassSignature(packetInputStream).also { delayedTee.squeeze() }
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}
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fun readSignature(): PGPSignature {
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return PGPSignature(packetInputStream).also { delayedTee.squeeze() }
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}
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fun readMarker(): MarkerPacket {
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return (readPacket() as MarkerPacket).also { delayedTee.squeeze() }
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}
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fun close() {
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packetInputStream.close()
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}
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class DelayedTeeInputStream(
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private val inputStream: InputStream,
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private val outputStream: OutputStream
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) : InputStream() {
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private var last: Int = -1
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override fun read(): Int {
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if (last != -1) {
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outputStream.write(last)
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}
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return try {
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last = inputStream.read()
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last
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} catch (e : IOException) {
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if (e.message?.contains("crc check failed in armored message") == true) {
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throw e
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}
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-1
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}
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}
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override fun read(b: ByteArray, off: Int, len: Int): Int {
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if (last != -1) {
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outputStream.write(last)
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}
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inputStream.read(b, off, len).let { r ->
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last = if (r > 0) {
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outputStream.write(b, off, r - 1)
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b[off + r - 1].toInt()
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} else {
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-1
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}
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return r
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}
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}
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/**
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* Squeeze the last byte out and update the output stream.
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*/
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fun squeeze() {
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if (last != -1) {
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outputStream.write(last)
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}
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last = -1
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}
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override fun close() {
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inputStream.close()
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outputStream.close()
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}
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}
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}
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