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POPHP MD5 equivalent to Java
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copied!<p>I need a PHP equivalent for Java's MD5 functionality which takes a byte array and return the hash as a 16 byte array back. <strong>I'm not need an Java equivalent for the PHP's md5 function.</strong> The problem is that the PHP's <code>md5</code> function takes only strings, not byte arrays.</p> <p>Heres is the expected result in Java:</p> <pre><code>// input byte array // for short: 123456 final byte[] data = new byte[] { (byte) 0x12, (byte) 0x34, (byte) 0x56 }; // expected 16 hash bytes // for short: ae1fa6209a246b8b2f2cd2d21be8f2e1 final byte[] expectedHash = new byte[] { (byte) 0xae, (byte) 0x1f, (byte) 0xa6, (byte) 0x20, (byte) 0x9a, (byte) 0x24, (byte) 0x6b, (byte) 0x8b, (byte) 0x2f, (byte) 0x2c, (byte) 0xd2, (byte) 0xd2, (byte) 0x1b, (byte) 0xe8, (byte) 0xf2, (byte) 0xe1 }; </code></pre> <p>My try in PHP is:</p> <pre><code><?php // input byte array $data = array(0x12, 0x34, 0x56); // pack data in a string, becouse md5 can only // compute a hash for a string $dataString = pack('C*', $data); // is it the right way? var_dump($dataString); // compute the hash and get a string back $hash = md5($dataString, true); // expected 16 hash bytes // for short: ae1fa6209a246b8b2f2cd2d21be8f2e1 $expected = array( 0xae, 0x1f, 0xa6, 0x20, 0x9a, 0x24, 0x6b, 0x8b, 0x2f, 0x2c, 0xd2, 0xd2, 0x1b, 0xe8, 0xf2, 0xe1); var_dump($expected); // convert the string back to a byte array $actual = unpack('C*', $hash); // is it the right way? var_dump($actual); assert($expected == $actual); ?> </code></pre> <p><code>$dataString</code> has the length of 0. So the first error must be in <code>pack</code>. But I don't know how to pack an arbitrary byte array into a string. Can you give me the right <code>format</code> argument for that?</p>

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