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-rw-r--r--include/php_compat/hash_hmac.php25
1 files changed, 25 insertions, 0 deletions
diff --git a/include/php_compat/hash_hmac.php b/include/php_compat/hash_hmac.php
new file mode 100644
index 000000000..5f05e370c
--- /dev/null
+++ b/include/php_compat/hash_hmac.php
@@ -0,0 +1,25 @@
+<?php
+//(hash) - enabled by default as of PHP 5.1.2
+function hash_hmac($algo, $data, $key, $raw_output=false)
+{
+ /* md5 and sha1 only */
+ $algo=strtolower($algo);
+ $p=array('md5'=>'H32','sha1'=>'H40');
+ if ( !isset($p[$algo]) or !function_exists($algo) )
+ {
+ $algo = 'md5';
+ }
+ if(strlen($key)>64) $key=pack($p[$algo],$algo($key));
+ if(strlen($key)<64) $key=str_pad($key,64,chr(0));
+
+ $ipad=substr($key,0,64) ^ str_repeat(chr(0x36),64);
+ $opad=substr($key,0,64) ^ str_repeat(chr(0x5C),64);
+
+ $ret = $algo($opad.pack($p[$algo],$algo($ipad.$data)));
+ if ($raw_output)
+ {
+ $ret = pack('H*', $ret);
+ }
+ return $ret;
+}
+?> \ No newline at end of file