SHA1Native.java

/*
 * Copyright (C) 2022, Matthias Sohn <matthias.sohn@sap.com> 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.util.sha1;

import java.security.MessageDigest;

import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.MutableObjectId;
import org.eclipse.jgit.lib.ObjectId;

/**
 * SHA1 implementation using native implementation from JDK. It doesn't support
 * collision detection but is faster than the pure Java implementation.
 */
class SHA1Native extends SHA1 {

    private final MessageDigest md;

    SHA1Native() {
        md = Constants.newMessageDigest();
    }

    @Override
    public void update(byte b) {
        md.update(b);
    }

    @Override
    public void update(byte[] in) {
        md.update(in);
    }

    @Override
    public void update(byte[] in, int p, int len) {
        md.update(in, p, len);
    }

    @Override
    public byte[] digest() throws Sha1CollisionException {
        return md.digest();
    }

    @Override
    public ObjectId toObjectId() throws Sha1CollisionException {
        return ObjectId.fromRaw(md.digest());
    }

    @Override
    public void digest(MutableObjectId id) throws Sha1CollisionException {
        id.fromRaw(md.digest());
    }

    @Override
    public SHA1 reset() {
        md.reset();
        return this;
    }

    @Override
    public SHA1 setDetectCollision(boolean detect) {
        return this;
    }

    @Override
    public boolean hasCollision() {
        return false;
    }
}