/*
* 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.jwk;
import com.fasterxml.jackson.core.type.TypeReference;
import org.keycloak.common.util.Base64Url;
import org.keycloak.util.JsonSerialization;
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.PublicKey;
import java.security.spec.RSAPublicKeySpec;
import java.util.Map;
/**
* @author <a href="mailto:sthorger@redhat.com">Stian Thorgersen</a>
*/
public class JWKParser {
private static TypeReference<Map<String,String>> typeRef = new TypeReference<Map<String,String>>() {};
private JWK jwk;
private JWKParser() {
}
public JWKParser(JWK jwk) {
this.jwk = jwk;
}
public static JWKParser create() {
return new JWKParser();
}
public static JWKParser create(JWK jwk) {
return new JWKParser(jwk);
}
public JWKParser parse(String jwk) {
try {
this.jwk = JsonSerialization.mapper.readValue(jwk, JWK.class);
return this;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public JWK getJwk() {
return jwk;
}
public PublicKey toPublicKey() {
String keyType = jwk.getKeyType();
if (isKeyTypeSupported(keyType)) {
BigInteger modulus = new BigInteger(1, Base64Url.decode(jwk.getOtherClaims().get(RSAPublicJWK.MODULUS).toString()));
BigInteger publicExponent = new BigInteger(1, Base64Url.decode(jwk.getOtherClaims().get(RSAPublicJWK.PUBLIC_EXPONENT).toString()));
try {
return KeyFactory.getInstance("RSA").generatePublic(new RSAPublicKeySpec(modulus, publicExponent));
} catch (Exception e) {
throw new RuntimeException(e);
}
} else {
throw new RuntimeException("Unsupported keyType " + keyType);
}
}
public boolean isKeyTypeSupported(String keyType) {
return RSAPublicJWK.RSA.equals(keyType);
}
}