CODEWITHSUNDEEP
phpactionscript-3
Geo Paul
Geo Paul

Reputation: 1817

crc32 in php and as3

I am planning to use crc32 checksum to check data integrity on REST API calls. I use a crc32 library from http://www.icana.org.ar/ICANACardRotator/source/nochump/util/zip/CRC32.as

This and php crc32 function are giving different outputs. In as3 I use the below code

var c:crc32 = new crc32();
var arr:ByteArray = new ByteArray();
arr.writeObject("Hello World!");
c.update(arr);
trace(c.getValue());

which gives me 2098676879

in php I use

<?php
$str = crc32("Hello World!");
printf("%u\n",$str);
?>

which outputs 472456355

Can somebody help me telling what is the difference?

Upvotes: 1

Views: 178

Answers (1)

fsbmain
fsbmain

Reputation: 5267

ByteArray.writeObject writes AMF encoded object into ByteArray instead of utf string, that's why you got different result. So the solution is to use writeUTFBytes:

        var c:CRC32 = new CRC32();
        var arr:ByteArray = new ByteArray();
        arr.writeUTFBytes("Hello World!");
        c.update(arr);
        trace(c.getValue()); //output 472456355

Upvotes: 1

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