question

public static PublicKey getPublicKey(final BigInteger modulus, final BigInteger exponent) {
  try {
    final KeyFactory factory = KeyFactory.getInstance("RSA");
    final PublicKey publicKey = factory.generatePublic(new RSAPublicKeySpec(modulus, exponent));
    return publicKey;
  } catch (GeneralSecurityException e) {
    return null;
  }
}


public static String encryptPAN(final String prefix, final String pan, PublicKey publicKey) {
  byte[] input = String.format("%s%s", prefix, pan).getBytes();


  try {
    Cipher cipher = Cipher.getInstance("RSA/None/OAEPWithSHA1AndMGF1Padding");
    cipher.init(Cipher.ENCRYPT_MODE, publicKey, new SecureRandom());
    byte[] cipherText = cipher.doFinal(input);
    return Base64.encodeToString(cipherText, Base64.DEFAULT);
  } catch (GeneralSecurityException ignore) {
    return null;
  }
}

{
  "paymentId": "6KMQGW15R5N44",
  "result": "DECLINED",
  "failureMessage": "RE0528 - EncrptBlock is invalid|"
}