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Posted by cbmeeks on 04/10/07 00:59
ok, here is my problem (PHP newbie here). I have a test webpage that
contains the following code:
[hmac-sha1.php]
<?php
//Calculate HMAC-SHA1 according to RFC2104
// http://www.ietf.org/rfc/rfc2104.txt
function hmacsha1($key,$data) {
$blocksize=64;
$hashfunc='sha1';
if (strlen($key)>$blocksize)
$key=pack('H*', $hashfunc($key));
$key=str_pad($key,$blocksize,chr(0x00));
$ipad=str_repeat(chr(0x36),$blocksize);
$opad=str_repeat(chr(0x5c),$blocksize);
$hmac = pack('H*',$hashfunc(($key^$opad).pack('H*',$hashfunc(($key^
$ipad).$data))));
return base64_encode($hmac);
}
?>
I have another test page that contains:
[test.php]
<?php
require_once("hmac-sha1.php");
$r = $_POST["data"];
echo $r;
echo "\n\n";
echo hmacsha1("OtxrzxIsfpFjA7SwPzILwy8Bw21TLhquhboDYROV",$r);
echo "\n\n\n";
echo hmacsha1("OtxrzxIsfpFjA7SwPzILwy8Bw21TLhquhboDYROV","PUT
\nc8fdb181845a4ca6b8fec737b3581d76\ntext/html\nThu, 17 Nov 2005
18:49:58 GMT\nx-amz-magic:abracadabra\nx-amz-meta-author:foo@bar.com\n/
quotes/nelson");
?>
Now, I have a C# application that POST's data to the second page. It
posts to the "data" variable. The value I post is that strange
looking "PUT\nc...." you see.
Looking at the second page, when I "echo $r" I get exactly what I
posted. But when I "echo hmacsha1" and use the $r variable, I get
something completely different than when I use the hard-coded value.
I hope that makes sense.
Any clues as to why the $r returns a different hash than the hard-
coded method? Even though $r contains the EXACT same copy? I've
checked it byte-per-byte.
I suspect some kind of encoding problem or something.
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