Change hard-coded keysize from 512 to 1024

In order to configure our dataSource without requiring a plaintext password in the configuration file, we extended JdbcDataSource to create our own custom implementation. Our dataSource config now looks something like this:

<dataSource type="com.foo.FooDataSource" driver="oracle.jdbc.OracleDriver" url="jdbc:oracle:thin:@db-host-machine:1521:tst1" user="testuser" password="{ENC}{1.1}1ePOfWcbOIU056gKiLTrLw=="/>

We are using the RSA JSAFE Crypto-J libraries for encrypting/decrypting the password. However, this seems to cause an issue when we try use Solr in a Cloud Configuration (using Zookeeper). The error is "Strong key gen and multiprime gen require at least 1024-bit keysize." Full log attached.

This seems to be due to the hard-coded value of 512 in the org.apache.solr.util.CryptoKeys$RSAKeyPair class:

public RSAKeyPair() {
  KeyPairGenerator keyGen = null;
  try {
    keyGen = KeyPairGenerator.getInstance("RSA");
  } catch (NoSuchAlgorithmException e) {
    throw new SolrException(SolrException.ErrorCode.SERVER_ERROR, e);
  }
  keyGen.initialize(512);

I pulled down the Solr code, changed the hard-coded value to 1024, rebuilt it, and now everything seems to work great.