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PemUtils.java
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72 lines (61 loc) · 2.76 KB
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package com.auth0.jwt;
import org.bouncycastle.util.io.pem.PemObject;
import org.bouncycastle.util.io.pem.PemReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.security.KeyFactory;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.EncodedKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
public class PemUtils {
private static byte[] parsePEMFile(File pemFile) throws IOException {
if (!pemFile.isFile() || !pemFile.exists()) {
throw new FileNotFoundException(String.format("The file '%s' doesn't exist.", pemFile.getAbsolutePath()));
}
PemReader reader = new PemReader(new FileReader(pemFile));
PemObject pemObject = reader.readPemObject();
byte[] content = pemObject.getContent();
reader.close();
return content;
}
private static PublicKey getPublicKey(byte[] keyBytes, String algorithm) {
PublicKey publicKey = null;
try {
KeyFactory kf = KeyFactory.getInstance(algorithm);
EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
publicKey = kf.generatePublic(keySpec);
} catch (NoSuchAlgorithmException e) {
System.out.println("Could not reconstruct the public key, the given algorithm could not be found.");
} catch (InvalidKeySpecException e) {
System.out.println("Could not reconstruct the public key");
}
return publicKey;
}
private static PrivateKey getPrivateKey(byte[] keyBytes, String algorithm) {
PrivateKey privateKey = null;
try {
KeyFactory kf = KeyFactory.getInstance(algorithm);
EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
privateKey = kf.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException e) {
System.out.println("Could not reconstruct the private key, the given algorithm could not be found.");
} catch (InvalidKeySpecException e) {
System.out.println("Could not reconstruct the private key");
}
return privateKey;
}
public static PublicKey readPublicKeyFromFile(String filepath, String algorithm) throws IOException {
byte[] bytes = PemUtils.parsePEMFile(new File(filepath));
return PemUtils.getPublicKey(bytes, algorithm);
}
public static PrivateKey readPrivateKeyFromFile(String filepath, String algorithm) throws IOException {
byte[] bytes = PemUtils.parsePEMFile(new File(filepath));
return PemUtils.getPrivateKey(bytes, algorithm);
}
}