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SignatureEngine.java
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SignatureEngine.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.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.PublicKey;
import java.security.Signature;
import java.security.SignatureException;
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 SignatureEngine {
private static final int READ_BUFFER_SIZE = 4096;
private static final String ALGO_SHA256_WITH_RSA = "SHA256withRSA";
private static final String ALGO_SHA512_WITH_RSA = "SHA512withRSA";
public boolean supportsSHA256RSA(@Nullable Provider provider) {
return supportsAlgorithm(ALGO_SHA256_WITH_RSA, provider);
}
/**
* @param is ownership is not taken, caller needs to close the stream
*/
public @NonNull byte[] signSHA256RSA(
@NonNull PrivateKey privateKey,
@NonNull InputStream is,
@Nullable Provider provider
) throws SignatureFailedException, IOException {
return signUsingAlgorithm(privateKey, ALGO_SHA256_WITH_RSA, is, provider);
}
public boolean supportsSHA512RSA(@Nullable Provider provider) {
return supportsAlgorithm(ALGO_SHA512_WITH_RSA, provider);
}
/**
* @param is ownership is not taken, caller needs to close the stream
*/
public @NonNull byte[] signSHA512RSA(
@NonNull PrivateKey privateKey,
@NonNull InputStream is,
@Nullable Provider provider
) throws SignatureFailedException, IOException {
return signUsingAlgorithm(privateKey, ALGO_SHA512_WITH_RSA, is, provider);
}
public boolean supportsAlgorithm(@NonNull String algorithm, @Nullable Provider provider) {
requireNonNull(algorithm);
try {
configureSignature(algorithm, provider);
return true;
} catch (NoSuchAlgorithmException ignored) {
return false;
}
}
/**
* @param is ownership is not taken, caller needs to close the stream
*/
public @NonNull byte[] signUsingAlgorithm(
@NonNull PrivateKey privateKey,
@NonNull String algorithm,
@NonNull InputStream is,
@Nullable Provider provider
) throws SignatureFailedException, IOException {
requireNonNull(privateKey);
requireNonNull(is);
requireNonNull(algorithm);
try {
Signature privateSignature = configureSignature(algorithm, provider);
privateSignature.initSign(privateKey);
processFully(is, READ_BUFFER_SIZE, privateSignature::update);
byte[] signature = privateSignature.sign();
return signature;
} catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException e) {
throw new SignatureFailedException(e);
}
}
/**
* @param is ownership is not taken, caller needs to close the stream
*/
public @NonNull boolean verifySHA256RSA(
@NonNull byte[] referenceSignature,
@NonNull PublicKey publicKey,
@NonNull InputStream is,
@Nullable Provider provider
) throws SignatureFailedException, IOException {
return verifyUsingAlgorithm(referenceSignature, publicKey, ALGO_SHA256_WITH_RSA, is, provider);
}
/**
* @param is ownership is not taken, caller needs to close the stream
*/
public @NonNull boolean verifySHA512RSA(
@NonNull byte[] referenceSignature,
@NonNull PublicKey publicKey,
@NonNull InputStream is,
@Nullable Provider provider
) throws SignatureFailedException, IOException {
return verifyUsingAlgorithm(referenceSignature, publicKey, ALGO_SHA512_WITH_RSA, is, provider);
}
/**
* @param is ownership is not taken, caller needs to close the stream
*/
public @NonNull boolean verifyUsingAlgorithm(
@NonNull byte[] referenceSignature,
@NonNull PublicKey publicKey,
@NonNull String algorithm,
@NonNull InputStream is,
@Nullable Provider provider
) throws SignatureFailedException, IOException {
requireNonNull(referenceSignature);
requireNonNull(publicKey);
requireNonNull(algorithm);
requireNonNull(is);
try {
Signature privateSignature = configureSignature(algorithm, provider);
privateSignature.initVerify(publicKey);
processFully(is, READ_BUFFER_SIZE, privateSignature::update);
boolean verified = privateSignature.verify(referenceSignature);
return verified;
} catch (NoSuchAlgorithmException | InvalidKeyException | SignatureException e) {
throw new SignatureFailedException(e);
}
}
private @NonNull Signature configureSignature(@NonNull String algorithm, @Nullable Provider provider)
throws NoSuchAlgorithmException {
requireNonNull(algorithm);
return provider != null
? Signature.getInstance(algorithm, provider)
: Signature.getInstance(algorithm);
}
}