diff options
| -rw-r--r-- | Net/OpenID/CryptUtil.php | 55 |
1 files changed, 53 insertions, 2 deletions
diff --git a/Net/OpenID/CryptUtil.php b/Net/OpenID/CryptUtil.php index 2c75e20..e2ca995 100644 --- a/Net/OpenID/CryptUtil.php +++ b/Net/OpenID/CryptUtil.php @@ -114,11 +114,62 @@ class Net_OpenID_CryptUtil { } function longToBinary($long) { - return pack("L", $long); + + $lib =& Net_OpenID_MathLibrary::getLibWrapper(); + + if ($lib->cmp($long, 0) < 0) { + print "numToBytes takes only positive integers."; + return null; + } + + if ($long == 0) { + return "\x00"; + } + + $bytes = array(); + + while ($long) { + array_unshift($bytes, $lib->mod($long, 256)); + $long = $lib->div($long, pow(2, 8)); + } + + if ($bytes && ($bytes[0] > 127)) { + array_unshift($bytes, 0); + } + + $string = ''; + foreach ($bytes as $byte) { + $string .= pack('C', $byte); + } + + return $string; } function binaryToLong($str) { - return unpack($str, "L"); + + $lib =& Net_OpenID_MathLibrary::getLibWrapper(); + + if ($str === null) { + return null; + } + + // Use array_merge to return a zero-indexed array instead of a + // one-indexed array. + $bytes = array_merge(unpack('C*', $str)); + + $n = $lib->init(0); + + if ($bytes && ($bytes[0] > 127)) { + print "bytesToNum works only for positive integers."; + return null; + } + + foreach ($bytes as $byte) { + $n = $lib->mul($n, pow(2, 8)); + $n = $lib->add($n, $byte); + } + + return $n; } function base64ToLong($str) { |