Created
June 19, 2022 14:34
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RSAProvider
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| /* | |
| * Copyright 2016 Red Hat, Inc. and/or its affiliates | |
| * and other contributors as indicated by the @author tags. | |
| * | |
| * 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 org.keycloak.jose.jws.crypto; | |
| import org.keycloak.common.util.PemUtils; | |
| import org.keycloak.jose.jws.Algorithm; | |
| import org.keycloak.jose.jws.JWSInput; | |
| import java.nio.charset.StandardCharsets; | |
| import java.security.PrivateKey; | |
| import java.security.PublicKey; | |
| import java.security.Signature; | |
| import java.security.cert.X509Certificate; | |
| /** | |
| * @author <a href="mailto:bill@burkecentral.com">Bill Burke</a> | |
| * @version $Revision: 1 $ | |
| */ | |
| public class RSAProvider implements SignatureProvider { | |
| public static String getJavaAlgorithm(Algorithm alg) { | |
| switch (alg) { | |
| case RS256: | |
| return "SHA256withRSA"; | |
| case RS384: | |
| return "SHA384withRSA"; | |
| case RS512: | |
| return "SHA512withRSA"; | |
| default: | |
| throw new IllegalArgumentException("Not an RSA Algorithm"); | |
| } | |
| } | |
| public static Signature getSignature(Algorithm alg) { | |
| try { | |
| return Signature.getInstance(getJavaAlgorithm(alg)); | |
| } catch (Exception e) { | |
| throw new RuntimeException(e); | |
| } | |
| } | |
| public static byte[] sign(byte[] data, Algorithm algorithm, PrivateKey privateKey) { | |
| try { | |
| Signature signature = getSignature(algorithm); | |
| signature.initSign(privateKey); | |
| signature.update(data); | |
| return signature.sign(); | |
| } catch (Exception e) { | |
| throw new RuntimeException(e); | |
| } | |
| } | |
| public static boolean verifyViaCertificate(JWSInput input, String cert) { | |
| X509Certificate certificate = null; | |
| try { | |
| certificate = PemUtils.decodeCertificate(cert); | |
| } catch (Exception e) { | |
| throw new RuntimeException(e); | |
| } | |
| return verify(input, certificate.getPublicKey()); | |
| } | |
| public static boolean verify(JWSInput input, PublicKey publicKey) { | |
| try { | |
| Signature verifier = getSignature(input.getHeader().getAlgorithm()); | |
| verifier.initVerify(publicKey); | |
| verifier.update(input.getEncodedSignatureInput().getBytes(StandardCharsets.UTF_8)); | |
| return verifier.verify(input.getSignature()); | |
| } catch (Exception e) { | |
| return false; | |
| } | |
| } | |
| @Override | |
| public boolean verify(JWSInput input, String key) { | |
| return verifyViaCertificate(input, key); | |
| } | |
| } |
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