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/*
* Copyright (C) 2008-2019, Juick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.juick;
import com.github.scribejava.apis.AppleClientSecretGenerator;
import io.jsonwebtoken.Claims;
import io.jsonwebtoken.Jws;
import io.jsonwebtoken.Jwts;
import org.apache.commons.io.FileUtils;
import org.bouncycastle.asn1.pkcs.PrivateKeyInfo;
import org.bouncycastle.jce.ECNamedCurveTable;
import org.bouncycastle.jce.interfaces.ECPrivateKey;
import org.bouncycastle.jce.interfaces.ECPublicKey;
import org.bouncycastle.jce.spec.ECParameterSpec;
import org.bouncycastle.jce.spec.ECPublicKeySpec;
import org.bouncycastle.math.ec.ECPoint;
import org.bouncycastle.openssl.PEMParser;
import org.bouncycastle.openssl.jcajce.JcaPEMKeyConverter;
import org.junit.Test;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.Resource;
import java.io.File;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.security.spec.InvalidKeySpecException;
import static org.junit.Assert.assertThat;
import static org.hamcrest.Matchers.*;
public class JWTTest {
@Value("classpath:testkey.p8")
Resource p8key;
@Test
public void testAppleClientSecret() throws NoSuchAlgorithmException, IOException, InvalidKeySpecException, NoSuchProviderException {
AppleClientSecretGenerator clientSecretGenerator =
new AppleClientSecretGenerator("example", "1", "2", p8key.getFilename());
String secret = new String(clientSecretGenerator.getClientSecret().getBytes(), StandardCharsets.UTF_8);
String p8encodedData = FileUtils.readFileToString(new File(p8key.getFilename()), StandardCharsets.UTF_8);
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
JcaPEMKeyConverter pemConverter = new JcaPEMKeyConverter();
pemConverter.setProvider("BC");
//EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(Base64.getDecoder().decode(p8encodedData));
// Strips the "---- {BEGIN,END} {CERTIFICATE,PUBLIC/PRIVATE KEY} -----"-like header and footer lines,
// base64-decodes the body,
// then uses the proper key specification format to turn it into a JCA Key instance
final Reader pemReader = new StringReader(p8encodedData);
final PEMParser parser = new PEMParser(pemReader);
PrivateKey privateKey;
Object pemObj = parser.readObject();
privateKey = pemConverter.getPrivateKey((PrivateKeyInfo) pemObj);
// Generate public key from private key
KeyFactory keyFactory = KeyFactory.getInstance("ECDSA", "BC");
ECParameterSpec ecSpec = ECNamedCurveTable.getParameterSpec("secp256r1");
ECPoint Q = ecSpec.getG().multiply(((ECPrivateKey)privateKey).getD());
byte[] publicDerBytes = Q.getEncoded(false);
ECPoint point = ecSpec.getCurve().decodePoint(publicDerBytes);
ECPublicKeySpec pubSpec = new ECPublicKeySpec(point, ecSpec);
ECPublicKey publicKeyGenerated = (ECPublicKey) keyFactory.generatePublic(pubSpec);
Jws jwt = Jwts.parser()
.setSigningKey(publicKeyGenerated)
.parseClaimsJws(secret);
assertThat(jwt.getHeader().get("kid"), is("2"));
assertThat(jwt.getHeader().get("alg"), is("ES256"));
Claims claims = (Claims)jwt.getBody();
assertThat(claims.get("iss"), is("1"));
assertThat(claims.get("sub"), is("example"));
assertThat(claims.get("aud"), is("https://appleid.apple.com"));
}
}
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