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DigestEngine.java
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DigestEngine.java
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/*
* Copyright (C) 2017 DV Bern AG, Switzerland
*
* 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 ch.dvbern.lib.cryptutil;
import java.io.IOException;
import java.io.InputStream;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.Provider;
import ch.dvbern.lib.cryptutil.annotations.NonNull;
import ch.dvbern.lib.cryptutil.annotations.Nullable;
import static ch.dvbern.lib.cryptutil.Util.processFully;
import static java.util.Objects.requireNonNull;
public class DigestEngine {
private static final int READ_BUFFER_SIZE = 4096;
public static final String ALGO_SHA256 = "SHA-256";
public static final String ALGO_SHA512 = "SHA-512";
public boolean supportsSHA256(@Nullable Provider provider) {
return supports(ALGO_SHA256, provider);
}
/**
* @param is ownership is not taken, caller needs to close the stream
*/
public @NonNull byte[] digestSHA256(@NonNull InputStream is, @Nullable Provider provider)
throws IOException, DigestFailedException {
return digestWithAlgo(is, ALGO_SHA256, provider);
}
public @NonNull MessageDigest configureSHA256(@Nullable Provider provider) {
try {
return configureMessageDigest(ALGO_SHA256, provider);
} catch (NoSuchAlgorithmException e) {
throw new IllegalArgumentException("No such algorithm: " + ALGO_SHA256, e);
}
}
public boolean supportsSHA512(@Nullable Provider provider) {
return supports(ALGO_SHA512, provider);
}
/**
* @param is ownership is not taken, caller needs to close the stream
*/
public @NonNull byte[] digestSHA512(@NonNull InputStream is, @Nullable Provider provider)
throws IOException, DigestFailedException {
return digestWithAlgo(is, ALGO_SHA512, provider);
}
public @NonNull MessageDigest configureSHA512(@Nullable Provider provider) {
try {
return configureMessageDigest(ALGO_SHA512, provider);
} catch (NoSuchAlgorithmException e) {
throw new IllegalArgumentException("No such algorithm: " + ALGO_SHA512, e);
}
}
public boolean supports(@NonNull String algorithm, @Nullable Provider provider) {
try {
configureMessageDigest(algorithm, provider);
return true;
} catch (NoSuchAlgorithmException ignored) {
return false;
}
}
/**
* @param is ownership is not taken, caller needs to close the stream
*/
public @NonNull byte[] digestWithAlgo(
@NonNull InputStream is,
@NonNull String algorithm,
@Nullable Provider provider
) throws DigestFailedException, IOException {
requireNonNull(is);
requireNonNull(algorithm);
MessageDigest md = null;
try {
md = configureMessageDigest(algorithm, provider);
} catch (NoSuchAlgorithmException e) {
throw new DigestFailedException("No such algorithm: " + algorithm, e);
}
byte[] digest = digestFully(md, is);
return digest;
}
/**
* @param is ownership is not taken, caller needs to close the stream
*/
private @NonNull byte[] digestFully(@NonNull MessageDigest md, @NonNull InputStream is) throws IOException {
requireNonNull(is);
requireNonNull(md);
processFully(is, READ_BUFFER_SIZE, md::update);
return md.digest();
}
public @NonNull MessageDigest configureMessageDigest(@NonNull String algorithm, @Nullable Provider provider)
throws NoSuchAlgorithmException {
requireNonNull(algorithm);
return provider != null
? MessageDigest.getInstance(algorithm, provider)
: MessageDigest.getInstance(algorithm);
}
}