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/*
* Copyright (C) 2018, Salesforce. and others
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Distribution License v. 1.0 which is available at
* https://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
package org.eclipse.jgit.lib.internal;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.net.URISyntaxException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Security;
import org.bouncycastle.bcpg.ArmoredOutputStream;
import org.bouncycastle.bcpg.BCPGOutputStream;
import org.bouncycastle.bcpg.HashAlgorithmTags;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.openpgp.PGPException;
import org.bouncycastle.openpgp.PGPPrivateKey;
import org.bouncycastle.openpgp.PGPSecretKey;
import org.bouncycastle.openpgp.PGPSignature;
import org.bouncycastle.openpgp.PGPSignatureGenerator;
import org.bouncycastle.openpgp.operator.jcajce.JcaPGPContentSignerBuilder;
import org.bouncycastle.openpgp.operator.jcajce.JcePBESecretKeyDecryptorBuilder;
import org.eclipse.jgit.annotations.NonNull;
import org.eclipse.jgit.annotations.Nullable;
import org.eclipse.jgit.api.errors.CanceledException;
import org.eclipse.jgit.api.errors.JGitInternalException;
import org.eclipse.jgit.errors.UnsupportedCredentialItem;
import org.eclipse.jgit.internal.JGitText;
import org.eclipse.jgit.lib.CommitBuilder;
import org.eclipse.jgit.lib.GpgSignature;
import org.eclipse.jgit.lib.GpgSigner;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.transport.CredentialsProvider;
/**
* GPG Signer using BouncyCastle library
*/
public class BouncyCastleGpgSigner extends GpgSigner {
private static void registerBouncyCastleProviderIfNecessary() {
if (Security.getProvider(BouncyCastleProvider.PROVIDER_NAME) == null) {
Security.addProvider(new BouncyCastleProvider());
}
}
/**
* Create a new instance.
* <p>
* The BounceCastleProvider will be registered if necessary.
* </p>
*/
public BouncyCastleGpgSigner() {
registerBouncyCastleProviderIfNecessary();
}
@Override
public boolean canLocateSigningKey(@Nullable String gpgSigningKey,
PersonIdent committer, CredentialsProvider credentialsProvider)
throws CanceledException {
try (BouncyCastleGpgKeyPassphrasePrompt passphrasePrompt = new BouncyCastleGpgKeyPassphrasePrompt(
credentialsProvider)) {
BouncyCastleGpgKey gpgKey = locateSigningKey(gpgSigningKey,
committer, passphrasePrompt);
return gpgKey != null;
} catch (PGPException | IOException | NoSuchAlgorithmException
| NoSuchProviderException | URISyntaxException e) {
return false;
}
}
private BouncyCastleGpgKey locateSigningKey(@Nullable String gpgSigningKey,
PersonIdent committer,
BouncyCastleGpgKeyPassphrasePrompt passphrasePrompt)
throws CanceledException, UnsupportedCredentialItem, IOException,
NoSuchAlgorithmException, NoSuchProviderException, PGPException,
URISyntaxException {
if (gpgSigningKey == null || gpgSigningKey.isEmpty()) {
gpgSigningKey = '<' + committer.getEmailAddress() + '>';
}
BouncyCastleGpgKeyLocator keyHelper = new BouncyCastleGpgKeyLocator(
gpgSigningKey, passphrasePrompt);
return keyHelper.findSecretKey();
}
@Override
public void sign(@NonNull CommitBuilder commit,
@Nullable String gpgSigningKey, @NonNull PersonIdent committer,
CredentialsProvider credentialsProvider) throws CanceledException {
try (BouncyCastleGpgKeyPassphrasePrompt passphrasePrompt = new BouncyCastleGpgKeyPassphrasePrompt(
credentialsProvider)) {
BouncyCastleGpgKey gpgKey = locateSigningKey(gpgSigningKey,
committer, passphrasePrompt);
PGPSecretKey secretKey = gpgKey.getSecretKey();
if (secretKey == null) {
throw new JGitInternalException(
JGitText.get().unableToSignCommitNoSecretKey);
}
char[] passphrase = passphrasePrompt.getPassphrase(
secretKey.getPublicKey().getFingerprint(),
gpgKey.getOrigin());
PGPPrivateKey privateKey = secretKey
.extractPrivateKey(new JcePBESecretKeyDecryptorBuilder()
.setProvider(BouncyCastleProvider.PROVIDER_NAME)
.build(passphrase));
PGPSignatureGenerator signatureGenerator = new PGPSignatureGenerator(
new JcaPGPContentSignerBuilder(
secretKey.getPublicKey().getAlgorithm(),
HashAlgorithmTags.SHA256).setProvider(
BouncyCastleProvider.PROVIDER_NAME));
signatureGenerator.init(PGPSignature.BINARY_DOCUMENT, privateKey);
ByteArrayOutputStream buffer = new ByteArrayOutputStream();
try (BCPGOutputStream out = new BCPGOutputStream(
new ArmoredOutputStream(buffer))) {
signatureGenerator.update(commit.build());
signatureGenerator.generate().encode(out);
}
commit.setGpgSignature(new GpgSignature(buffer.toByteArray()));
} catch (PGPException | IOException | NoSuchAlgorithmException
| NoSuchProviderException | URISyntaxException e) {
throw new JGitInternalException(e.getMessage(), e);
}
}
}
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