SolrPasswordHash.java

import java.nio.charset.StandardCharsets;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.Random;
import org.apache.commons.codec.binary.Base64;

public class SolrPasswordHash {
  public static void main (String[] args) {
    if (args.length == 0) {
      System.err.println("Nothing to do.");
      System.exit(1);
    }

    String pw = args[0];
    MessageDigest digest;
    try {
      digest = MessageDigest.getInstance("SHA-256");

      final Random r = new SecureRandom();
      byte[] salt = new byte[32];
      r.nextBytes(salt);

      digest.reset();
      digest.update(salt);
      byte[] btPass = digest.digest(pw.getBytes(StandardCharsets.UTF_8));
      digest.reset();
      btPass = digest.digest(btPass);

      System.out.println(Base64.encodeBase64String(btPass) + " " +
        Base64.encodeBase64String(salt));
      System.exit(0);
    } catch (NoSuchAlgorithmException e) {
      System.err.println("Unknown algorithm: " + e.getMessage());
    }
    System.exit(2);
  }
}