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Kotlin conversion: MessageInspector
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2 changed files with 108 additions and 146 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;
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import java.io.ByteArrayInputStream;
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import java.io.IOException;
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import java.io.InputStream;
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import java.nio.charset.Charset;
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import java.util.ArrayList;
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import java.util.Collections;
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import java.util.List;
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import org.bouncycastle.openpgp.PGPCompressedData;
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import org.bouncycastle.openpgp.PGPEncryptedData;
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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.PGPObjectFactory;
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import org.bouncycastle.openpgp.PGPOnePassSignatureList;
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import org.bouncycastle.openpgp.PGPPBEEncryptedData;
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import org.bouncycastle.openpgp.PGPPublicKeyEncryptedData;
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import org.bouncycastle.openpgp.PGPUtil;
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import org.pgpainless.implementation.ImplementationFactory;
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import org.pgpainless.util.ArmorUtils;
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/**
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* Inspect an OpenPGP message to determine IDs of its encryption keys or whether it is passphrase protected.
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*/
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public final class MessageInspector {
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public static class EncryptionInfo {
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private final List<Long> keyIds = new ArrayList<>();
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private boolean isPassphraseEncrypted = false;
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private boolean isSignedOnly = false;
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/**
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* Return a list of recipient key ids for whom the message is encrypted.
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* @return recipient key ids
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*/
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public List<Long> getKeyIds() {
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return Collections.unmodifiableList(keyIds);
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}
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public boolean isPassphraseEncrypted() {
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return isPassphraseEncrypted;
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}
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/**
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* Return true, if the message is encrypted.
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*
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* @return true if encrypted
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*/
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public boolean isEncrypted() {
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return isPassphraseEncrypted || !keyIds.isEmpty();
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}
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/**
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* Return true, if the message is not encrypted, but signed using {@link org.bouncycastle.openpgp.PGPOnePassSignature OnePassSignatures}.
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*
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* @return true if message is signed only
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*/
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public boolean isSignedOnly() {
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return isSignedOnly;
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}
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}
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private MessageInspector() {
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}
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/**
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* Parses parts of the provided OpenPGP message in order to determine which keys were used to encrypt it.
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*
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* @param message OpenPGP message
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* @return encryption info
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*
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* @throws PGPException in case the message is broken
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* @throws IOException in case of an IO error
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*/
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public static EncryptionInfo determineEncryptionInfoForMessage(String message) throws PGPException, IOException {
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@SuppressWarnings("CharsetObjectCanBeUsed")
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Charset charset = Charset.forName("UTF-8");
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return determineEncryptionInfoForMessage(new ByteArrayInputStream(message.getBytes(charset)));
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}
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/**
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* Parses parts of the provided OpenPGP message in order to determine which keys were used to encrypt it.
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* Note: This method does not rewind the passed in Stream, so you might need to take care of that yourselves.
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*
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* @param dataIn openpgp message
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* @return encryption information
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*
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* @throws IOException in case of an IO error
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* @throws PGPException if the message is broken
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*/
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public static EncryptionInfo determineEncryptionInfoForMessage(InputStream dataIn) throws IOException, PGPException {
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InputStream decoded = ArmorUtils.getDecoderStream(dataIn);
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EncryptionInfo info = new EncryptionInfo();
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processMessage(decoded, info);
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return info;
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}
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private static void processMessage(InputStream dataIn, EncryptionInfo info) throws PGPException, IOException {
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PGPObjectFactory objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(dataIn);
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Object next;
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while ((next = objectFactory.nextObject()) != null) {
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if (next instanceof PGPOnePassSignatureList) {
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PGPOnePassSignatureList signatures = (PGPOnePassSignatureList) next;
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if (!signatures.isEmpty()) {
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info.isSignedOnly = true;
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return;
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}
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}
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if (next instanceof PGPEncryptedDataList) {
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PGPEncryptedDataList encryptedDataList = (PGPEncryptedDataList) next;
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for (PGPEncryptedData encryptedData : encryptedDataList) {
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if (encryptedData instanceof PGPPublicKeyEncryptedData) {
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PGPPublicKeyEncryptedData pubKeyEncryptedData = (PGPPublicKeyEncryptedData) encryptedData;
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info.keyIds.add(pubKeyEncryptedData.getKeyID());
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} else if (encryptedData instanceof PGPPBEEncryptedData) {
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info.isPassphraseEncrypted = true;
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}
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}
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// Data is encrypted, we cannot go deeper
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return;
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}
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if (next instanceof PGPCompressedData) {
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PGPCompressedData compressed = (PGPCompressedData) next;
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InputStream decompressed = compressed.getDataStream();
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InputStream decoded = PGPUtil.getDecoderStream(decompressed);
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objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(decoded);
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}
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if (next instanceof PGPLiteralData) {
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return;
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}
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}
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}
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}
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@ -0,0 +1,108 @@
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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.openpgp.*
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import org.pgpainless.implementation.ImplementationFactory
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import org.pgpainless.util.ArmorUtils
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import java.io.IOException
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import java.io.InputStream
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/**
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* Inspect an OpenPGP message to determine IDs of its encryption keys or whether it is passphrase protected.
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*/
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class MessageInspector {
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/**
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* Info about an OpenPGP message.
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*
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* @param keyIds List of recipient key ids for whom the message is encrypted.
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* @param isPassphraseEncrypted true, if the message is encrypted for a passphrase
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* @param isSignedOnly true, if the message is not encrypted, but signed using OnePassSignatures
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*/
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data class EncryptionInfo(
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val keyIds: List<Long>,
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val isPassphraseEncrypted: Boolean,
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val isSignedOnly: Boolean) {
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val isEncrypted: Boolean
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get() = isPassphraseEncrypted || keyIds.isNotEmpty()
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}
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companion object {
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/**
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* Parses parts of the provided OpenPGP message in order to determine which keys were used to encrypt it.
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*
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* @param message OpenPGP message
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* @return encryption info
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*
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* @throws PGPException in case the message is broken
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* @throws IOException in case of an IO error
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*/
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@JvmStatic
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@Throws(PGPException::class, IOException::class)
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fun determineEncryptionInfoForMessage(message: String): EncryptionInfo = determineEncryptionInfoForMessage(message.byteInputStream())
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/**
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* Parses parts of the provided OpenPGP message in order to determine which keys were used to encrypt it.
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* Note: This method does not rewind the passed in Stream, so you might need to take care of that yourselves.
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*
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* @param inputStream openpgp message
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* @return encryption information
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*
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* @throws IOException in case of an IO error
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* @throws PGPException if the message is broken
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*/
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@JvmStatic
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@Throws(PGPException::class, IOException::class)
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fun determineEncryptionInfoForMessage(inputStream: InputStream): EncryptionInfo {
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return processMessage(ArmorUtils.getDecoderStream(inputStream))
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}
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@JvmStatic
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@Throws(PGPException::class, IOException::class)
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private fun processMessage(inputStream: InputStream): EncryptionInfo {
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var objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(inputStream)
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var n: Any?
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while (objectFactory.nextObject().also { n = it } != null) {
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when (val next = n!!) {
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is PGPOnePassSignatureList -> {
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if (!next.isEmpty) {
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return EncryptionInfo(listOf(), isPassphraseEncrypted = false, isSignedOnly = true)
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}
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}
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is PGPEncryptedDataList -> {
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var isPassphraseEncrypted = false
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val keyIds = mutableListOf<Long>()
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for (encryptedData in next) {
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if (encryptedData is PGPPublicKeyEncryptedData) {
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keyIds.add(encryptedData.keyID)
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} else if (encryptedData is PGPPBEEncryptedData) {
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isPassphraseEncrypted = true
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}
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}
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// Data is encrypted, we cannot go deeper
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return EncryptionInfo(keyIds, isPassphraseEncrypted, false)
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}
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is PGPCompressedData -> {
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objectFactory = ImplementationFactory.getInstance().getPGPObjectFactory(
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PGPUtil.getDecoderStream(next.dataStream))
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continue
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}
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is PGPLiteralData -> {
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break
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}
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}
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}
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return EncryptionInfo(listOf(), isPassphraseEncrypted = false, isSignedOnly = false)
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}
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}
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}
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