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base32
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base32


  • Subject: base32
  • From: Sandro Noel <email@hidden>
  • Date: Wed, 23 Sep 2009 16:14:35 -0400

This is probably stupid but i need to ask, sorry.

I've been looking all around the internet for a simple Base 32 encode/ decode cocoa function
but all i can find are somehow not compatible with the PHP implementation on my web site.


see, if i encode and then decode on the website everything validates perfectly. ( same value in as value out )
if i use the same encoded string and try to decode with my local computer it does not validate.


so i'm trying to find a simple cocoa base32 encode/decode function that would be as simple as this php one,.
or a good specification that i can build from.. Any pointer would be ok,


thank you in advance.

Sandro


<?php function base32_encode($input) { // Get a binary representation of $input $binary = unpack('C*', $input); $binary = vsprintf(str_repeat('b', count($binary)), $binary);

	$binaryLength = strlen($binary);
	$base32_characters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567";
	$currentPosition = 0;
	$output = '';

	while($currentPosition < $binaryLength) {
		$bits = substr($binary, $currentPosition, 5);

		if(strlen($bits) < 5)
			$bits = str_pad($bits, 5, "0");

		// Convert the 5 bits into a decimal number
		// and append the matching character to $output
		$output .= $base32_characters[bindec($bits)];
		$currentPosition += 5;
	}

	// Pad the output length to a multiple of 8 with '=' characters
	$desiredOutputLength = strlen($output);
	if($desiredOutputLength % 8 != 0) {
		$desiredOutputLength += (8 - ($desiredOutputLength % 8));
		$output = str_pad($output, $desiredOutputLength, "=");
	}

	return $output;
}
?>

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