Это возможное решение для проверки токена Apple.
В реализации используется ключ Apple publi c, опубликованный на -> https://appleid.apple.com/auth/keys
Ключи преобразуются в формат PEM из формата XML (https://appleid.apple.com/auth/keys) и чем токен проверен.
Часть кода может использоваться для преобразования модуля и экспоненты в строковом формате в ключ RSA Publi c в формате PEM
import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PublicKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.RSAPublicKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Base64;
import org.springframework.security.jwt.JwtHelper;
import org.springframework.security.jwt.crypto.sign.RsaVerifier;
public class VerifyAppleToken {
public static void main(String...args) throws Exception {
String jwtAppleToken = ""; //copy here the token from apple
System.out.println("THE TOKEN IS VERIFIED FOR ONE OF APPLE KEYS:"+verify(jwtAppleToken));
//copied from https://appleid.apple.com/auth/keys
final String base64UrlEncodedModulus = "lxrwmuYSAsTfn-lUu4goZSXBD9ackM9OJuwUVQHmbZo6GW4Fu_auUdN5zI7Y1dEDfgt7m7QXWbHuMD01HLnD4eRtY-RNwCWdjNfEaY_esUPY3OVMrNDI15Ns13xspWS3q-13kdGv9jHI28P87RvMpjz_JCpQ5IM44oSyRnYtVJO-320SB8E2Bw92pmrenbp67KRUzTEVfGU4-obP5RZ09OxvCr1io4KJvEOjDJuuoClF66AT72WymtoMdwzUmhINjR0XSqK6H0MdWsjw7ysyd_JhmqX5CAaT9Pgi0J8lU_pcl215oANqjy7Ob-VMhug9eGyxAWVfu_1u6QJKePlE-w";
final String base64UrlEncodedExp = "AQAB";
String publicKey = getPemPublicKeyFromBase64UrlEncodedXMLRSAKey(base64UrlEncodedModulus, base64UrlEncodedExp);
System.out.println(verify(jwtAppleToken, publicKey));
//copied from and converted to base64 from base64UrlEncoded https://appleid.apple.com/auth/keys on
// 07/02/2020
final String base64EncodedModulus = "lxrwmuYSAsTfn+lUu4goZSXBD9ackM9OJuwUVQHmbZo6GW4Fu/auUdN5zI7Y1dEDfgt7m7QXWbHuMD01HLnD4eRtY+RNwCWdjNfEaY/esUPY3OVMrNDI15Ns13xspWS3q+13kdGv9jHI28P87RvMpjz/JCpQ5IM44oSyRnYtVJO+320SB8E2Bw92pmrenbp67KRUzTEVfGU4+obP5RZ09OxvCr1io4KJvEOjDJuuoClF66AT72WymtoMdwzUmhINjR0XSqK6H0MdWsjw7ysyd/JhmqX5CAaT9Pgi0J8lU/pcl215oANqjy7Ob+VMhug9eGyxAWVfu/1u6QJKePlE+w==";
final String base64EncodedExp = "AQAB";
System.out.println("-----BEGIN PUBLIC KEY-----");
System.out.println(getPemPublicKeyFromBase64XMLRSAKey(base64EncodedModulus, base64EncodedExp));
System.out.println("-----END PUBLIC KEY-----");
}
private static boolean verify(String jwtAppleToken) throws NoSuchAlgorithmException, InvalidKeySpecException {
AppleKeysRetrieverService retriver = new AppleKeysRetrieverService();
AppleKeysResponse res = retriver.sendRetriveRequest("https://appleid.apple.com/auth/keys");
List<AppleKeyDTO> appleKeys = res.getKeys();
for (AppleKeyDTO appleKeyDTO : appleKeys) {
final String base64UrlEncodedModulus = appleKeyDTO.getN();
final String base64UrlEncodedExp = appleKeyDTO.getE();
String publicKey1 = getPemPublicKeyFromBase64UrlEncodedXMLRSAKey(base64UrlEncodedModulus, base64UrlEncodedExp);
if(verify(jwtAppleToken, publicKey1)) {
return true;
}
}
return false;
}
public static boolean verify(String jwtToken, String publicKey) {
try {
JwtHelper.decodeAndVerify(jwtToken, new RsaVerifier(getRSAPublicKey(publicKey)));
} catch (Exception e) {
return false;
}
return true;
}
private static RSAPublicKey getRSAPublicKey(String publicKey) throws NoSuchAlgorithmException, InvalidKeySpecException {
KeyFactory keyFactory = java.security.KeyFactory.getInstance("RSA");
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(java.util.Base64.getDecoder().decode(publicKey));
return (RSAPublicKey) keyFactory.generatePublic(keySpec);
}
private static String getPemPublicKeyFromBase64UrlEncodedXMLRSAKey(String urlBase64Modulus, String urlBase64Exp) throws NoSuchAlgorithmException, InvalidKeySpecException {
byte[] e = Base64.getUrlDecoder().decode(urlBase64Exp);
byte[] n = Base64.getUrlDecoder().decode(urlBase64Modulus);
BigInteger exponent = new BigInteger(1, e);
BigInteger modulus = new BigInteger(1, n);
return getPemPublicKey(modulus, exponent);
}
private static String getPemPublicKeyFromBase64XMLRSAKey(String base64Modulus, String base64Exp) throws NoSuchAlgorithmException, InvalidKeySpecException {
byte[] e = Base64.getDecoder().decode(base64Exp);
byte[] n = Base64.getDecoder().decode(base64Modulus);
BigInteger exponent = new BigInteger(1, e);
BigInteger modulus = (new BigInteger(1, n));
return getPemPublicKey(modulus, exponent);
}
private static String getPemPublicKey(BigInteger modulus, BigInteger exponent) throws NoSuchAlgorithmException, InvalidKeySpecException {
RSAPublicKeySpec publicKeySpec = new java.security.spec.RSAPublicKeySpec(modulus, exponent);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
PublicKey myPublicKey = keyFactory.generatePublic(publicKeySpec);
byte[] park = Base64.getEncoder().encode(myPublicKey.getEncoded());
return new String(park);
}
}
Ключи от Apple:
public class AppleKeysRetrieverService {
public AppleKeysResponse sendRetriveRequest(String retriveAppleKeysUrl) {
RestTemplate restTemplate = new RestTemplate();
restTemplate.getMessageConverters()
.add(0, new StringHttpMessageConverter(StandardCharsets.UTF_8));
String appleKeysResponse = restTemplate
.getForObject(retriveAppleKeysUrl, String.class);
ObjectMapper objectMapper = new ObjectMapper();
objectMapper.configure(
DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
AppleKeysResponse res = null;
try {
res = objectMapper.readValue(appleKeysResponse, AppleKeysResponse.class);
return res;
}catch(Exception e) {
return null;
}
}
}
public class AppleKeyDTO {
public String kty;
public String kid;
public String sig;
public String alg;
public String n;
public String e;
public String getKty() {
return kty;
}
public void setKty(String kty) {
this.kty = kty;
}
public String getKid() {
return kid;
}
public void setKid(String kid) {
this.kid = kid;
}
public String getSig() {
return sig;
}
public void setSig(String sig) {
this.sig = sig;
}
public String getAlg() {
return alg;
}
public void setAlg(String alg) {
this.alg = alg;
}
public String getN() {
return n;
}
public void setN(String n) {
this.n = n;
}
public String getE() {
return e;
}
public void setE(String e) {
this.e = e;
}
}
public class AppleKeysResponse {
private List<AppleKeyDTO> keys;
public List<AppleKeyDTO> getKeys() {
return keys;
}
public void setKeys(List<AppleKeyDTO> keys) {
this.keys = keys;
}
}