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Java library for interacting with the Digipost REST API

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/*
 * Copyright (C) Posten Norge AS
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package no.digipost.api.client.security;

import org.bouncycastle.crypto.ExtendedDigest;
import org.bouncycastle.crypto.digests.SHA256Digest;

@FunctionalInterface
public interface Digester {

    final static Digester sha256 = data -> {
        ExtendedDigest instance = new SHA256Digest();
        byte[] result = new byte[instance.getDigestSize()];
        instance.update(data, 0, data.length);
        instance.doFinal(result, 0);
        return result;
    };

    byte[] createDigest(byte[] data);

}