问题

Background

I'm working on a Bukkit Plugin (Minecraft Server-side). The plugin allows for players to send messages back and forth to each other. I am working on a web interface as well. In order to view their 'inbox' they must first login from a password the can set in-game.

This password isn't stored raw, it is converted into a long string of unicode values, then broken up into pieces, each converted to hex and appended to a different string.

Java version

//This isn't the best method, I know, but it's still going to take a genius to crack it.
//The resulting number (before somewhat converted to hex) is really
//long, there isn't an easy way of knowing the sequence of characters.
//This conversion is much different than straight up converting to hex,
//as PHP has certain limitations
public static String encodePassword(String password) {
    String longNumber = "";
    for(int i = 0; i < password.length(); i++) {
        longNumber += ((int) password.charAt(i));
    }
    //System.out.println("long = " + longNumber);
    String result = "";
    int splitLength = 5;
    int iterations = longNumber.length() / splitLength;
    if(longNumber.length() % splitLength > 0)
        iterations++;
    for(int i = 0; i < iterations; i++) {
        //System.out.println(result);
        int start = splitLength * i;
        if(longNumber.length() - start <= splitLength) {
            String sub = longNumber.substring(start);
            result += Integer.toHexString(Integer.parseInt(sub));
            continue;
        }
        String sub = longNumber.substring(start, start + splitLength);
        result += Integer.toHexString(Integer.parseInt(sub));
    }
    return result;
}

PHP version

function encodePassword($pw){
    $unicode = "";
    for($i=0; $i<strlen($pw); $i++){
        $char = $pw{$i};
        $val = unicode_value($char);
        $unicode = $unicode.$val;
    }
    $result = "";
    $splitLength = 5;
    $iterations = strlen($unicode) / $splitLength;
    if(strlen($unicode) % $splitLength > 0)
        $iterations++;
    for($i = 0; $i < $iterations; $i++) {
        $start = $splitLength * $i;
        if(strlen($unicode) - $start <= $splitLength) {
            $sub = substr($unicode, $start);
            $result = $result.base_convert($sub, 10, 16);
            continue;
        }
        $sub = substr($unicode, $start, $splitLength);
        $result = $result.base_convert($sub, 10, 16);
    }
    return $result;
}

If I 'encode' the password "partychat" (the name of the plugin, it has a group chat functionality as well) I get 2c212c93ef23163a91bcc in Java, and 2c212c93ef23163a91bcc0 (same except for trailing 0) in PHP. Anything I'm doing wrong?

Note: This doesn't always happen, most 'encoding' works fine, but for some reason this case occurs sometimes

回答1:

Why do you even want this, I would just use a hash of the userpassword like: This stackoverflow question about SHA-256, I know its not solving your issue, but it is way more secure not to invent your own encryptionstandard :)

来源：https://stackoverflow.com/questions/18709117/extra-trailing-zero-or-missing-zero-java-php

标签

java