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    <p>I originally stumbled across this question in my own search for a PHP implementation of the two MySQL password hashing functions. I was unable to find any implementations, so I adapted my own from the MySQL source code (sql/password.c). The following are tested and working in PHP 5.2:</p> <pre><code>// The following is free for any use provided credit is given where due. // This code comes with NO WARRANTY of any kind, including any implied warranty. /** * MySQL "OLD_PASSWORD()" AKA MySQL323 HASH FUNCTION * This is the password hashing function used in MySQL prior to version 4.1.1 * By Rev. Dustin Fineout 10/9/2009 9:12:16 AM **/ function mysql_old_password_hash($input, $hex = true) { $nr = 1345345333; $add = 7; $nr2 = 0x12345671; $tmp = null; $inlen = strlen($input); for ($i = 0; $i &lt; $inlen; $i++) { $byte = substr($input, $i, 1); if ($byte == ' ' || $byte == "\t") continue; $tmp = ord($byte); $nr ^= ((($nr &amp; 63) + $add) * $tmp) + (($nr &lt;&lt; 8) &amp; 0xFFFFFFFF); $nr2 += (($nr2 &lt;&lt; 8) &amp; 0xFFFFFFFF) ^ $nr; $add += $tmp; } $out_a = $nr &amp; ((1 &lt;&lt; 31) - 1); $out_b = $nr2 &amp; ((1 &lt;&lt; 31) - 1); $output = sprintf("%08x%08x", $out_a, $out_b); if ($hex) return $output; return hex_hash_to_bin($output); } //END function mysql_old_password_hash /** * MySQL "PASSWORD()" AKA MySQLSHA1 HASH FUNCTION * This is the password hashing function used in MySQL since version 4.1.1 * By Rev. Dustin Fineout 10/9/2009 9:36:20 AM **/ function mysql_password_hash($input, $hex = true) { $sha1_stage1 = sha1($input, true); $output = sha1($sha1_stage1, !$hex); return $output; } //END function mysql_password_hash /** * Computes each hexidecimal pair into the corresponding binary octet. * Similar to mysql hex2octet function. **/ function hex_hash_to_bin($hex) { $bin = ""; $len = strlen($hex); for ($i = 0; $i &lt; $len; $i += 2) { $byte_hex = substr($hex, $i, 2); $byte_dec = hexdec($byte_hex); $byte_char = chr($byte_dec); $bin .= $byte_char; } return $bin; } //END function hex_hash_to_bin </code></pre> <p>Hopefully someone else will find this useful as well :)</p>
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    1. COWorks perfect! Nice php implementation.
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    2. COI had some problems on an old linux server running PHP 5.1.6, tracked down the issue ((1 << 31) - 1) calculating to 0x80000000 instead of 0x7FFFFFFF. I didn't bother researching whether or not its a 5.1 bug or something else. Regardless, I replaced $out_a and $out_b assignments and worked like a charm. Thanks!
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    3. COYep it's a version-specific bug with integer overflow from what I can tell.
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