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25 lines
637 B
PHP
25 lines
637 B
PHP
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<?php
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//(hash) - enabled by default as of PHP 5.1.2
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function hash_hmac($algo, $data, $key, $raw_output=false)
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{
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/* md5 and sha1 only */
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$algo=strtolower($algo);
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$p=array('md5'=>'H32','sha1'=>'H40');
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if ( !isset($p[$algo]) or !function_exists($algo) )
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{
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$algo = 'md5';
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}
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if(strlen($key)>64) $key=pack($p[$algo],$algo($key));
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if(strlen($key)<64) $key=str_pad($key,64,chr(0));
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$ipad=substr($key,0,64) ^ str_repeat(chr(0x36),64);
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$opad=substr($key,0,64) ^ str_repeat(chr(0x5C),64);
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$ret = $algo($opad.pack($p[$algo],$algo($ipad.$data)));
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if ($raw_output)
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{
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$ret = pack('H*', $ret);
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}
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return $ret;
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}
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?>
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