[read public key from PEM string] #Java

publicKeyFromPEMString.java

import java.security.*;
import java.security.spec.*;
 

  public static java.security.Key publicKeyFromPEMString()
  {
    String devPublicKey = "-----BEGIN PUBLIC KEY-----\n"
        + "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsXn7MZWEOr1egercQtIk\n"
        + "......\n"
        + "......\n"
        + "......\n"
        + "nQIDAQAB\n"
        + "-----END PUBLIC KEY-----\n";

    devPublicKey = devPublicKey
        .replaceAll("\\n", "")
        .replace("-----BEGIN PUBLIC KEY-----", "")
        .replace("-----END PUBLIC KEY-----", "");;

    try
    {
      X509EncodedKeySpec publicSpec = new X509EncodedKeySpec(Base64.getDecoder().decode(devPublicKey));
      KeyFactory keyFactory = KeyFactory.getInstance("RSA");
      return keyFactory.generatePublic(publicSpec);
    }
    catch (NoSuchAlgorithmException e)
    {
      throw new UnsupportedJwtException("Cannot handle algorithm RSA", e);
    }
    catch (InvalidKeySpecException e)
    {
      throw new UnsupportedJwtException("Invalid public key", e);
    }
  }