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There is a newer version: v0.4.9

package one.credify.crypto;


import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;

import javax.crypto.*;
import javax.crypto.spec.PBEKeySpec;
import java.io.IOException;
import java.security.*;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Base64;

public class Utils {
  public final static String BEGIN_PUBLIC_KEY = "-----BEGIN PUBLIC KEY-----\n";
  public final static String END_PUBLIC_KEY = "\n-----END PUBLIC KEY-----";
  public final static String BEGIN_PRIVATE_KEY = "-----BEGIN PRIVATE KEY-----\n";
  public final static String END_PRIVATE_KEY = "\n-----END PRIVATE KEY-----";
  public final static String BEGIN_ENCRYPTED_PRIVATE_KEY = "-----BEGIN ENCRYPTED PRIVATE KEY-----\n";
  public final static String END_ENCRYPTED_PRIVATE_KEY = "\n-----END ENCRYPTED PRIVATE KEY-----";

  public static byte[] readEncryptedPrivateKey(String pem) {
    String privateKeyPEM = pem;
    privateKeyPEM = privateKeyPEM.replace(BEGIN_ENCRYPTED_PRIVATE_KEY, "");
    privateKeyPEM = privateKeyPEM.replace(END_ENCRYPTED_PRIVATE_KEY, "");
    privateKeyPEM = privateKeyPEM.replace("\n", "");
    return Base64.getDecoder().decode(privateKeyPEM);
  }

  public static PKCS8EncodedKeySpec readPKCS8Key(String pem, String password) throws IOException, GeneralSecurityException {
    EncryptedPrivateKeyInfo pkInfo = new EncryptedPrivateKeyInfo(Utils.readEncryptedPrivateKey(pem));
    SecretKey secretKey = SecretKeyFactory.getInstance("PBEWithHmacSHA256AndAES_256")
            .generateSecret(new PBEKeySpec(password.toCharArray()));
    AlgorithmParameters params = pkInfo.getAlgParameters();
    Cipher cipher = Cipher.getInstance(params.toString());
    cipher.init(Cipher.DECRYPT_MODE, secretKey, params);
    return pkInfo.getKeySpec(cipher);
  }

  public static byte[] hash(byte[] message) throws NoSuchAlgorithmException {
    MessageDigest messageDigest = MessageDigest.getInstance("SHA-256");
    return messageDigest.digest(message);
  }

  public static byte[] hashObject(Object message) throws NoSuchAlgorithmException, JsonProcessingException {
    ObjectMapper mapper = new ObjectMapper();
    return hash((mapper.writeValueAsBytes(message)));
  }
}