MySQL Hashing Function Implementation

Question

I know that php has md5(), sha1(), and the hash() functions, but I want to create a hash using the MySQL PASSWORD() function. So far, the only way I can think of is to just

Answer 1

Bad boys do that in bash with sha1sum ;)

PHRASE="password"; P1=`echo -n "${PHRASE}"|sha1sum`; P2="*`echo -en $(echo -n ${P1%% *}|sed -E 's/([0-9a-f]{2})/\\\x\1/g')|sha1sum -b`"; PASS="${P2%% *}"; echo "${PASS^^}"

OT, but anyway... :)

Answer 2

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:

// 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 Defines 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 < $inlen; $i++) {
    $byte = substr($input, $i, 1);
    if ($byte == ' ' || $byte == "\t") continue;
    $tmp = ord($byte);
    $nr ^= ((($nr & 63) + $add) * $tmp) + (($nr << 8) & 0xFFFFFFFF);
    $nr2 += (($nr2 << 8) & 0xFFFFFFFF) ^ $nr;
    $add += $tmp;
  }
  $out_a = $nr & ((1 << 31) - 1);
  $out_b = $nr2 & ((1 << 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 Defines 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 < $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

Hopefully someone else will find this useful as well :)

Answer 3

Perl 5 implementation of old_password() based on the PHP example.

sub old_hash_password {
    my ($password) = @_;

    my $nr = 1345345333;
    my $nr2 = 0x12345671;
    my $add = 7;

    for (my $i = 0; $i < length($password); $i++) {
        my $byte = substr($password, $i, 1);

        next if ($byte eq ' ' || $byte eq "\t");

        my $ord_b = ord($byte);
        $nr ^= ((($nr & 63) + $add) * $ord_b) + (($nr << 8) & 0xFFFFFFFF);
        $nr2 += (($nr2 << 8) & 0xFFFFFFFF) ^ $nr;
        $add += $ord_b;
    }

    my $out_a = $nr & ((1 << 31) - 1);
    my $out_b = $nr2 & ((1 << 31) - 1);

    return sprintf("%08x%08x", $out_a, $out_b);
}

Answer 4

Why do you want to use mysql password() function? Even the Mysql documentation advises against this:

http://dev.mysql.com/doc/refman/5.0/en/encryption-functions.html#function_password

The PASSWORD() function is used by the authentication system in MySQL Server; you should not use it in your own applications

You can use md5() for example, wich is present in almost every programming language, php and perl included.

Answer 5

If you are interested in the algorithm of this function, download the source code and see the file sql/password.c, or check this implementation.

Answer 6

Based on the PHP implementation above, here's a Perl example that works.

use Digest::SHA1 qw(sha1 sha1_hex);
sub password { "*".uc(sha1_hex(sha1($_[0]))) }

The password function returns the same as the MySQL5 PASSWORD() function.

In answer to "why would anyone want to do this?", I use it to generate SQL "CREATE USER" statements that don't contain plain-text passwords.