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Kotlin conversion: Cleartext Signature Framework
This commit is contained in:
parent
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commit
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GPG key ID:
62BEE9264BF17311
10 changed files with 297 additions and 337 deletions
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// SPDX-FileCopyrightText: 2021 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.cleartext_signatures;
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import java.io.BufferedOutputStream;
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import java.io.ByteArrayOutputStream;
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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.ArmoredInputStream;
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import org.bouncycastle.openpgp.PGPObjectFactory;
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import org.bouncycastle.openpgp.PGPSignatureList;
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import org.bouncycastle.util.Strings;
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import org.pgpainless.exception.WrongConsumingMethodException;
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import org.pgpainless.implementation.ImplementationFactory;
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import org.pgpainless.util.ArmoredInputStreamFactory;
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/**
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* Utility class to deal with cleartext-signed messages.
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* Based on Bouncycastle's {@link org.bouncycastle.openpgp.examples.ClearSignedFileProcessor}.
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*/
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public final class ClearsignedMessageUtil {
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private ClearsignedMessageUtil() {
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}
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/**
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* Dearmor a clearsigned message, detach the inband signatures and write the plaintext message to the provided
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* messageOutputStream.
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*
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* @param clearsignedInputStream input stream containing a clearsigned message
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* @param messageOutputStream output stream to which the dearmored message shall be written
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* @return signatures
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*
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* @throws IOException if the message is not clearsigned or some other IO error happens
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* @throws WrongConsumingMethodException in case the armored message is not cleartext signed
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*/
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public static PGPSignatureList detachSignaturesFromInbandClearsignedMessage(InputStream clearsignedInputStream,
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OutputStream messageOutputStream)
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throws IOException, WrongConsumingMethodException {
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ArmoredInputStream in;
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if (clearsignedInputStream instanceof ArmoredInputStream) {
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in = (ArmoredInputStream) clearsignedInputStream;
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} else {
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in = ArmoredInputStreamFactory.get(clearsignedInputStream);
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}
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if (!in.isClearText()) {
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throw new WrongConsumingMethodException("Message is not using the Cleartext Signature Framework.");
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}
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OutputStream out = new BufferedOutputStream(messageOutputStream);
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try {
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ByteArrayOutputStream lineOut = new ByteArrayOutputStream();
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int lookAhead = readInputLine(lineOut, in);
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byte[] lineSep = getLineSeparator();
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if (lookAhead != -1 && in.isClearText()) {
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byte[] line = lineOut.toByteArray();
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out.write(line, 0, getLengthWithoutSeparatorOrTrailingWhitespace(line));
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while (lookAhead != -1 && in.isClearText()) {
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lookAhead = readInputLine(lineOut, lookAhead, in);
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line = lineOut.toByteArray();
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out.write(lineSep);
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out.write(line, 0, getLengthWithoutSeparatorOrTrailingWhitespace(line));
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}
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} else {
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if (lookAhead != -1) {
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byte[] line = lineOut.toByteArray();
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out.write(line, 0, getLengthWithoutSeparatorOrTrailingWhitespace(line));
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}
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}
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} finally {
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out.close();
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}
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PGPObjectFactory objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(in);
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PGPSignatureList signatures = (PGPSignatureList) objectFactory.nextObject();
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return signatures;
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}
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public static int readInputLine(ByteArrayOutputStream bOut, InputStream fIn)
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throws IOException {
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bOut.reset();
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int lookAhead = -1;
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int ch;
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while ((ch = fIn.read()) >= 0) {
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bOut.write(ch);
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if (ch == '\r' || ch == '\n') {
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lookAhead = readPassedEOL(bOut, ch, fIn);
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break;
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}
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}
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return lookAhead;
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}
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public static int readInputLine(ByteArrayOutputStream bOut, int lookAhead, InputStream fIn)
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throws IOException {
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bOut.reset();
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int ch = lookAhead;
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do {
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bOut.write(ch);
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if (ch == '\r' || ch == '\n') {
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lookAhead = readPassedEOL(bOut, ch, fIn);
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break;
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}
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}
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while ((ch = fIn.read()) >= 0);
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if (ch < 0) {
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lookAhead = -1;
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}
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return lookAhead;
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}
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private static int readPassedEOL(ByteArrayOutputStream bOut, int lastCh, InputStream fIn)
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throws IOException {
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int lookAhead = fIn.read();
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if (lastCh == '\r' && lookAhead == '\n') {
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bOut.write(lookAhead);
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lookAhead = fIn.read();
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}
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return lookAhead;
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}
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private static byte[] getLineSeparator() {
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String nl = Strings.lineSeparator();
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byte[] nlBytes = new byte[nl.length()];
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for (int i = 0; i != nlBytes.length; i++) {
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nlBytes[i] = (byte) nl.charAt(i);
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}
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return nlBytes;
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}
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private static int getLengthWithoutSeparatorOrTrailingWhitespace(byte[] line) {
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int end = line.length - 1;
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while (end >= 0 && isWhiteSpace(line[end])) {
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end--;
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}
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return end + 1;
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}
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private static boolean isLineEnding(byte b) {
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return b == '\r' || b == '\n';
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}
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private static boolean isWhiteSpace(byte b) {
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return isLineEnding(b) || b == '\t' || b == ' ';
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}
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}
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// SPDX-FileCopyrightText: 2021 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.cleartext_signatures;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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/**
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* Implementation of the {@link MultiPassStrategy}.
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* This class keeps the read data in memory by caching the data inside a {@link ByteArrayOutputStream}.
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*
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* Note, that this class is suitable and efficient for processing small amounts of data.
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* For larger data like encrypted files, use of the {@link WriteToFileMultiPassStrategy} is recommended to
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* prevent {@link OutOfMemoryError OutOfMemoryErrors} and other issues.
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*/
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public class InMemoryMultiPassStrategy implements MultiPassStrategy {
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private final ByteArrayOutputStream cache = new ByteArrayOutputStream();
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@Override
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public ByteArrayOutputStream getMessageOutputStream() {
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return cache;
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}
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@Override
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public ByteArrayInputStream getMessageInputStream() {
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return new ByteArrayInputStream(getBytes());
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}
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public byte[] getBytes() {
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return getMessageOutputStream().toByteArray();
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}
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}
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// SPDX-FileCopyrightText: 2021 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.cleartext_signatures;
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import java.io.ByteArrayOutputStream;
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import java.io.File;
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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 for verification of cleartext signed messages, we need to read the whole data twice in order to verify signatures,
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* a strategy for how to cache the read data is required.
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* Otherwise, large data kept in memory could cause {@link OutOfMemoryError OutOfMemoryErrors} or other issues.
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*
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* This is an Interface that describes a strategy to deal with the fact that detached signatures require multiple passes
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* to do verification.
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*
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* This interface can be used to write the signed data stream out via {@link #getMessageOutputStream()} and later
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* get access to the data again via {@link #getMessageInputStream()}.
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* Thereby the detail where the data is being stored (memory, file, etc.) can be abstracted away.
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*/
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public interface MultiPassStrategy {
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/**
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* Provide an {@link OutputStream} into which the signed data can be read into.
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*
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* @return output stream
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* @throws IOException io error
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*/
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OutputStream getMessageOutputStream() throws IOException;
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/**
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* Provide an {@link InputStream} which contains the data that was previously written away in
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* {@link #getMessageOutputStream()}.
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*
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* As there may be multiple signatures that need to be processed, each call of this method MUST return
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* a new {@link InputStream}.
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*
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* @return input stream
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* @throws IOException io error
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*/
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InputStream getMessageInputStream() throws IOException;
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/**
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* Write the message content out to a file and re-read it to verify signatures.
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* This strategy is best suited for larger messages (e.g. plaintext signed files) which might not fit into memory.
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* After the message has been processed completely, the messages content are available at the provided file.
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*
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* @param file target file
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* @return strategy
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*/
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static MultiPassStrategy writeMessageToFile(File file) {
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return new WriteToFileMultiPassStrategy(file);
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}
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/**
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* Read the message content into memory.
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* This strategy is best suited for small messages which fit into memory.
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* After the message has been processed completely, the message content can be accessed by calling
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* {@link ByteArrayOutputStream#toByteArray()} on {@link #getMessageOutputStream()}.
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*
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* @return strategy
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*/
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static InMemoryMultiPassStrategy keepMessageInMemory() {
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return new InMemoryMultiPassStrategy();
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}
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}
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// SPDX-FileCopyrightText: 2021 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.cleartext_signatures;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.FileOutputStream;
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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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* Implementation of the {@link MultiPassStrategy}.
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* When processing signed data the first time, the data is being written out into a file.
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* For the second pass, that file is being read again.
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*
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* This strategy is recommended when larger amounts of data need to be processed.
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* For smaller files, {@link InMemoryMultiPassStrategy} yields higher efficiency.
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*/
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public class WriteToFileMultiPassStrategy implements MultiPassStrategy {
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private final File file;
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/**
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* Create a {@link MultiPassStrategy} which writes data to a file.
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* Note that {@link #getMessageOutputStream()} will create the file if necessary.
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*
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* @param file file to write the data to and read from
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*/
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public WriteToFileMultiPassStrategy(File file) {
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this.file = file;
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}
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@Override
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public OutputStream getMessageOutputStream() throws IOException {
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if (!file.exists()) {
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boolean created = file.createNewFile();
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if (!created) {
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throw new IOException("New file '" + file.getAbsolutePath() + "' was not created.");
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}
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}
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return new FileOutputStream(file);
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}
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@Override
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public InputStream getMessageInputStream() throws IOException {
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if (!file.exists()) {
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throw new IOException("File '" + file.getAbsolutePath() + "' does no longer exist.");
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}
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return new FileInputStream(file);
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}
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}
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// SPDX-FileCopyrightText: 2021 Paul Schaub <vanitasvitae@fsfe.org>
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//
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// SPDX-License-Identifier: Apache-2.0
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/**
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* Classes related to cleartext signature verification.
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*/
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package org.pgpainless.decryption_verification.cleartext_signatures;
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@ -0,0 +1,153 @@
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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.cleartext_signatures
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import org.bouncycastle.bcpg.ArmoredInputStream
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import org.bouncycastle.openpgp.PGPSignatureList
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import org.bouncycastle.util.Strings
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import org.pgpainless.exception.WrongConsumingMethodException
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import org.pgpainless.implementation.ImplementationFactory
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import org.pgpainless.util.ArmoredInputStreamFactory
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import java.io.*
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import kotlin.jvm.Throws
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/**
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* Utility class to deal with cleartext-signed messages.
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* Based on Bouncycastle's [org.bouncycastle.openpgp.examples.ClearSignedFileProcessor].
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*/
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class ClearsignedMessageUtil {
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companion object {
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/**
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* Dearmor a clearsigned message, detach the inband signatures and write the plaintext message to the provided
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* messageOutputStream.
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*
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* @param clearsignedInputStream input stream containing a clearsigned message
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* @param messageOutputStream output stream to which the dearmored message shall be written
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* @return signatures
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*
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* @throws IOException if the message is not clearsigned or some other IO error happens
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* @throws WrongConsumingMethodException in case the armored message is not cleartext signed
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*/
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@JvmStatic
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@Throws(WrongConsumingMethodException::class, IOException::class)
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fun detachSignaturesFromInbandClearsignedMessage(
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clearsignedInputStream: InputStream,
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messageOutputStream: OutputStream): PGPSignatureList {
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val input: ArmoredInputStream = if (clearsignedInputStream is ArmoredInputStream) {
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clearsignedInputStream
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} else {
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ArmoredInputStreamFactory.get(clearsignedInputStream)
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}
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if (!input.isClearText) {
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throw WrongConsumingMethodException("Message isn't using the Cleartext Signature Framework.")
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}
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BufferedOutputStream(messageOutputStream).use { output ->
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val lineOut = ByteArrayOutputStream()
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var lookAhead = readInputLine(lineOut, input)
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val lineSep = getLineSeparator()
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if (lookAhead != -1 && input.isClearText) {
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var line = lineOut.toByteArray()
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output.write(line, 0, getLengthWithoutSeparatorOrTrailingWhitespace(line))
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while (lookAhead != -1 && input.isClearText) {
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lookAhead = readInputLine(lineOut, lookAhead, input)
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line = lineOut.toByteArray()
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output.write(lineSep)
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output.write(line, 0, getLengthWithoutSeparatorOrTrailingWhitespace(line))
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}
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} else {
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if (lookAhead != -1) {
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val line = lineOut.toByteArray()
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output.write(line, 0, getLengthWithoutSeparatorOrTrailingWhitespace(line))
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}
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}
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}
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val objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(input)
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val next = objectFactory.nextObject() ?: PGPSignatureList(arrayOf())
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return next as PGPSignatureList
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}
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@JvmStatic
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private fun readInputLine(bOut: ByteArrayOutputStream, fIn: InputStream): Int {
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bOut.reset()
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var lookAhead = -1
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var ch: Int
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while (fIn.read().also { ch = it } >= 0) {
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bOut.write(ch)
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if (ch == '\r'.code || ch == '\n'.code) {
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lookAhead = readPassedEOL(bOut, ch, fIn)
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break
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}
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}
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return lookAhead
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}
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@JvmStatic
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private fun readInputLine(bOut: ByteArrayOutputStream, lookAhead: Int, fIn: InputStream): Int {
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var mLookAhead = lookAhead
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bOut.reset()
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var ch = mLookAhead
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do {
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bOut.write(ch)
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if (ch == '\r'.code || ch == '\n'.code) {
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mLookAhead = readPassedEOL(bOut, ch, fIn)
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break
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}
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} while (fIn.read().also { ch = it } >= 0)
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if (ch < 0) {
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mLookAhead = -1
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}
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return mLookAhead
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}
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@JvmStatic
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private fun readPassedEOL(bOut: ByteArrayOutputStream, lastCh: Int, fIn: InputStream): Int {
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var lookAhead = fIn.read()
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if (lastCh == '\r'.code && lookAhead == '\n'.code) {
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bOut.write(lookAhead)
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lookAhead = fIn.read()
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}
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return lookAhead
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}
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@JvmStatic
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private fun getLineSeparator(): ByteArray {
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val nl = Strings.lineSeparator()
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val nlBytes = ByteArray(nl.length)
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for (i in nlBytes.indices) {
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nlBytes[i] = nl[i].code.toByte()
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}
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return nlBytes
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}
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@JvmStatic
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private fun getLengthWithoutSeparatorOrTrailingWhitespace(line: ByteArray): Int {
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var end = line.size - 1
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while (end >= 0 && isWhiteSpace(line[end])) {
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end--
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}
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return end + 1
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}
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@JvmStatic
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private fun isLineEnding(b: Byte): Boolean {
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return b == '\r'.code.toByte() || b == '\n'.code.toByte()
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}
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@JvmStatic
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private fun isWhiteSpace(b: Byte): Boolean {
|
||||
return isLineEnding(b) || b == '\t'.code.toByte() || b == ' '.code.toByte()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,29 @@
|
|||
// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
|
||||
//
|
||||
// SPDX-License-Identifier: Apache-2.0
|
||||
|
||||
package org.pgpainless.decryption_verification.cleartext_signatures
|
||||
|
||||
import java.io.ByteArrayInputStream
|
||||
import java.io.ByteArrayOutputStream
|
||||
|
||||
/**
|
||||
* Implementation of the [MultiPassStrategy].
|
||||
* This class keeps the read data in memory by caching the data inside a [ByteArrayOutputStream].
|
||||
*
|
||||
* Note, that this class is suitable and efficient for processing small amounts of data.
|
||||
* For larger data like encrypted files, use of the [WriteToFileMultiPassStrategy] is recommended to
|
||||
* prevent [OutOfMemoryError] and other issues.
|
||||
*/
|
||||
class InMemoryMultiPassStrategy : MultiPassStrategy {
|
||||
|
||||
private val cache = ByteArrayOutputStream()
|
||||
|
||||
override val messageOutputStream: ByteArrayOutputStream
|
||||
get() = cache
|
||||
|
||||
override val messageInputStream: ByteArrayInputStream
|
||||
get() = ByteArrayInputStream(getBytes())
|
||||
|
||||
fun getBytes(): ByteArray = messageOutputStream.toByteArray()
|
||||
}
|
||||
|
|
@ -0,0 +1,71 @@
|
|||
// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
|
||||
//
|
||||
// SPDX-License-Identifier: Apache-2.0
|
||||
|
||||
package org.pgpainless.decryption_verification.cleartext_signatures
|
||||
|
||||
import java.io.*
|
||||
|
||||
/**
|
||||
* Since for verification of cleartext signed messages, we need to read the whole data twice in order to verify signatures,
|
||||
* a strategy for how to cache the read data is required.
|
||||
* Otherwise, large data kept in memory could cause an [OutOfMemoryError] or other issues.
|
||||
*
|
||||
* This is an Interface that describes a strategy to deal with the fact that detached signatures require multiple passes
|
||||
* to do verification.
|
||||
*
|
||||
* This interface can be used to write the signed data stream out via [messageOutputStream] and later
|
||||
* get access to the data again via [messageInputStream].
|
||||
* Thereby the detail where the data is being stored (memory, file, etc.) can be abstracted away.
|
||||
*/
|
||||
interface MultiPassStrategy {
|
||||
|
||||
/**
|
||||
* Provide an [OutputStream] into which the signed data can be read into.
|
||||
*
|
||||
* @return output stream
|
||||
* @throws IOException io error
|
||||
*/
|
||||
val messageOutputStream: OutputStream
|
||||
|
||||
/**
|
||||
* Provide an [InputStream] which contains the data that was previously written away in
|
||||
* [messageOutputStream].
|
||||
*
|
||||
* As there may be multiple signatures that need to be processed, each call of this method MUST return
|
||||
* a new [InputStream].
|
||||
*
|
||||
* @return input stream
|
||||
* @throws IOException io error
|
||||
*/
|
||||
val messageInputStream: InputStream
|
||||
|
||||
companion object {
|
||||
|
||||
/**
|
||||
* Write the message content out to a file and re-read it to verify signatures.
|
||||
* This strategy is best suited for larger messages (e.g. plaintext signed files) which might not fit into memory.
|
||||
* After the message has been processed completely, the messages content are available at the provided file.
|
||||
*
|
||||
* @param file target file
|
||||
* @return strategy
|
||||
*/
|
||||
@JvmStatic
|
||||
fun writeMessageToFile(file: File): MultiPassStrategy {
|
||||
return WriteToFileMultiPassStrategy(file)
|
||||
}
|
||||
|
||||
/**
|
||||
* Read the message content into memory.
|
||||
* This strategy is best suited for small messages which fit into memory.
|
||||
* After the message has been processed completely, the message content can be accessed by calling
|
||||
* [ByteArrayOutputStream.toByteArray] on [messageOutputStream].
|
||||
*
|
||||
* @return strategy
|
||||
*/
|
||||
@JvmStatic
|
||||
fun keepMessageInMemory(): InMemoryMultiPassStrategy {
|
||||
return InMemoryMultiPassStrategy()
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -0,0 +1,43 @@
|
|||
// SPDX-FileCopyrightText: 2023 Paul Schaub <vanitasvitae@fsfe.org>
|
||||
//
|
||||
// SPDX-License-Identifier: Apache-2.0
|
||||
|
||||
package org.pgpainless.decryption_verification.cleartext_signatures
|
||||
|
||||
import java.io.*
|
||||
|
||||
/**
|
||||
* Implementation of the [MultiPassStrategy].
|
||||
* When processing signed data the first time, the data is being written out into a file.
|
||||
* For the second pass, that file is being read again.
|
||||
*
|
||||
* This strategy is recommended when larger amounts of data need to be processed.
|
||||
* For smaller files, [InMemoryMultiPassStrategy] yields higher efficiency.
|
||||
*
|
||||
* @param file file to write the data to and read from
|
||||
*/
|
||||
class WriteToFileMultiPassStrategy(
|
||||
private val file: File
|
||||
) : MultiPassStrategy {
|
||||
|
||||
override val messageOutputStream: OutputStream
|
||||
@Throws(IOException::class)
|
||||
get() {
|
||||
if (!file.exists()) {
|
||||
if (!file.createNewFile()) {
|
||||
throw IOException("New file '${file.absolutePath}' could not be created.")
|
||||
}
|
||||
}
|
||||
return FileOutputStream(file)
|
||||
}
|
||||
|
||||
override val messageInputStream: InputStream
|
||||
@Throws(IOException::class)
|
||||
get() {
|
||||
if (!file.exists()) {
|
||||
throw IOException("File '${file.absolutePath}' does no longer exist.")
|
||||
}
|
||||
return FileInputStream(file)
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -69,7 +69,7 @@ public class InlineDetachImpl implements InlineDetach {
|
|||
if (armorIn.isClearText()) {
|
||||
try {
|
||||
signatures = ClearsignedMessageUtil.detachSignaturesFromInbandClearsignedMessage(armorIn, messageOutputStream);
|
||||
if (signatures == null) {
|
||||
if (signatures.isEmpty()) {
|
||||
throw new SOPGPException.BadData("Data did not contain OpenPGP signatures.");
|
||||
}
|
||||
} catch (WrongConsumingMethodException e) {
|
||||
|
|
|
|||
Loading…
Reference in a new issue