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很多做对接的小伙伴们都会遇到签名加密的问题，常用的就是hmac_sha1加密和hmac_md5加密，最开始用的是sha1加密，后来用到了md5加密，我以为直接把sha1改为md5就好了，结果试来试去跟文档提示的示例结果都对不上，最后经过查询搜索终于得到了正确的方法，现在把两种加密方法分享给大家

function do_hmac_sha1($str, $key) {$signature = "";if (function_exists('hash_hmac')) {$signature = base64_encode(hash_hmac("sha1", $str, $key, true));} else {$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) . $str))));$signature = base64_encode($hmac);}return $signature;
}

function do_hmac_md5($data, $key) {if (function_exists('hash_hmac')) {return hash_hmac('md5', $data, $key);}$bytelen = 64;// byte length for md5if (strlen($key) > $bytelen) {$key = pack('H*', md5($key));}$key = str_pad($key, $bytelen, chr(0x00));$ipad = str_pad('', $bytelen, chr(0x36));$opad = str_pad('', $bytelen, chr(0x5c));$k_ipad = $key ^ $ipad;$k_opad = $key ^ $opad;return md5($k_opad . pack('H*', md5($k_ipad . $data)));
}