84 lines
2.2 KiB
Java
84 lines
2.2 KiB
Java
// 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.encryption_signing;
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import java.io.OutputStream;
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import java.security.MessageDigest;
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import javax.annotation.Nonnull;
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import org.bouncycastle.crypto.Digest;
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import org.bouncycastle.crypto.Signer;
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import org.bouncycastle.openpgp.operator.PGPContentSignerBuilder;
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abstract class PGPHashContextContentSignerBuilder implements PGPContentSignerBuilder {
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// Copied from BC, required since BCs class is package visible only
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static class SignerOutputStream
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extends OutputStream {
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private Signer sig;
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SignerOutputStream(Signer sig) {
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this.sig = sig;
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}
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public void write(@Nonnull byte[] bytes, int off, int len) {
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sig.update(bytes, off, len);
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}
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public void write(@Nonnull byte[] bytes) {
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sig.update(bytes, 0, bytes.length);
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}
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public void write(int b) {
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sig.update((byte) b);
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}
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}
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static class ExistingMessageDigest implements Digest {
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private final MessageDigest digest;
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ExistingMessageDigest(MessageDigest messageDigest) {
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this.digest = messageDigest;
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}
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@Override
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public void update(byte in) {
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digest.update(in);
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}
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@Override
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public void update(byte[] in, int inOff, int len) {
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digest.update(in, inOff, len);
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}
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@Override
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public int doFinal(byte[] out, int outOff) {
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byte[] hash = digest.digest();
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System.arraycopy(hash, 0, out, outOff, hash.length);
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return getDigestSize();
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}
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@Override
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public void reset() {
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// Nope!
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// We cannot reset, since BCs signer classes are resetting in their init() methods, which would also reset
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// the messageDigest, losing its state. This would shatter our intention.
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}
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@Override
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public String getAlgorithmName() {
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return digest.getAlgorithm();
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}
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@Override
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public int getDigestSize() {
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return digest.getDigestLength();
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}
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}
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}
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