Question

I have to update one web app from Java to PHP and I found some hard problems…
The big problem is to convert the SHA1 from Java to PHP because someone before me developed an browser extension that need a particular auth code to work… i can’t change the plugin, i have only to convert the web app from java to php…

This is the code:

 private static final byte[] SecretKey;

  public static String AuthCode(String url) {

    byte[] urlBytes = url.getBytes("US-ASCII");

    byte[] concatenated = new byte[SecretKey.length + urlBytes.length];
    System.arraycopy(SecretKey, 0, concatenated, 0, SecretKey.length);
    System.arraycopy(urlBytes, 0, concatenated, SecretKey.length, urlBytes.length);

    byte[] hash = HashTools.calculateHash(concatenated, "SHA1");
    return CodecTools.encodeBASE64(hash);
  }

  static {
    SecretKey = new byte[] { 18, -15, -48, 73, 54, -115, 34, -87 };
  }

Now, I found very hard convert the SecretKey from byte to something else in php.. because php don’t have byte variable… and i read that sha1 in php is different from java.

In PHP I can’t make a sha1 of a array chars, it want only a String…

(the other stackoverflow answers suggest only how to change Java code to be equal to php.. I need that the PHP code should be equal to Java…)

I hope in someone that help me because I don’t really know Java…

Thanks to all 🙂

Answer 1

Use a simple string as byte container.

for example, if you want to store the secret key:

$secretKeyArray = array(18, -15, -48, 73, 54, -115, 34, -87);

$secretString = '';
foreach($secretKeyArray as $k => $v) {
   $secretString.= chr($v & 0xFF); // trim to 8 bits (for the negative values)
}

Now you have the secret key stored in $secretString.

Edit:

the concatenated array would be:

$concatenated = $secretString . $url;

and then

return base64_encode(sha1($concatenated, true));