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Convert PHP to Java – PHP Versions

Working on building a Java version of a Putty .ppk reader.

I found a PHP version, but I’m stuck on converting some functionality into Java:

    $password = 'blah';
    $symkey = '';
    $sequence = 0;
    while (strlen($symkey) < 32) {
      $temp = pack('Na*', $sequence++, $password);
      $symkey.= pack('H*', sha1($temp));
    }
    $symkey = substr($symkey, 0, 32);

I understand that $symkey.= pack('H*', sha1($temp)); is calling a sha1 hashing function, and I can do that in java, so that can remain a black-box for this. I’m assuming the pack('H*') is just converting the results of the sha1 hash to hex? It’s the pack('Na*' that I can’t grock (or find help with on Google)

Can someone help me, or point me in the right direction?

Thanks so much!

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2

Answers


  1. Chosen as BEST ANSWER
    0

    Will this do what I think it will?

    final   int             len         =   32;
final   String          pass        =   args[0];
final   StringBuilder   sb          =   new StringBuilder(pass);
                        sb.reverse();
                        sb.setLength(len);
                        sb.reverse();
            System.out.println("len:"+sb.length()+" sb:"+sb);
final   MessageDigest   crypt       =   MessageDigest.getInstance("SHA-1");
                        crypt.reset();
final   StringBuilder   sb2         =   new StringBuilder();
            while(sb2.length()<len) {
                        sb2.append(Base64.encodeBase64String(crypt.digest(String.valueOf(sb2).getBytes())));
            }           sb2.setLength(len);
final   String          base64pass  =   String.valueOf(sb2);
            System.out.println(base64pass);

  2. 0

    Assumin that pack is hashing function :

    String password = 'blah';
String  symkey  = '';
    int sequence = 0;
    while (symkey.length < 32) {
      String temp = pack("Na*", sequence++, password);
      symkey = pack("H*", sha1(temp));
    }
    symkey = symkey.substring(0, 32);

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