RSA签名功能问题

时间:2011-06-14 14:39:10

标签: php flex encryption rsa as3crypto

我正在使用RSA sign()函数生成私有流的签名URL。我正在测试PHP代码,但我想在Flex中重新编写代码。以下是PHP代码的一部分:

function getCannedPolicy($resource, $expires, $key, $privatekeyfile){
         $priv_key = file_get_contents($privatekeyfile);
         $pkeyid = openssl_get_privatekey($priv_key);
         $policy_str = '{"Statement":[{"Resource":"'.$resource.'","Condition":{"DateLessThan":{"AWS:EpochTime":'.$expires.'}}}]}';
         $policy_str = trim( preg_replace( '/\s+/', '', $policy_str ) );
         $res = openssl_sign($policy_str, $signature, $pkeyid, OPENSSL_ALGO_SHA1);
         $signature_base64 = (base64_encode($signature));
         $repl = array('+' => '-','=' => '_','/' => '~');
         $signature_base64 = strtr($signature_base64,$repl);
         $url = $resource . '?Expires='.$expires. '&Signature=' . $signature_base64 . '&Key-Pair-Id='. $key;

         return $url;
}

我在Flex中编写了相同的功能。这是代码:

private function getCannedPolicy(resource:String, expires:uint, key:String, privatekey:String):String{          
    var unsigned:String = '{"Statement":[{"Resource":"' +resource+ '","Condition":{"DateLessThan":{"AWS:EpochTime":' +expires+ '}}}]}';
    var signed:String = '';
    var signature:String = '';
    var regex:RegExp = /\s+/g;          
    unsigned = unsigned.replace(regex,'');
    var src:ByteArray = new ByteArray();            
    src.writeUTFBytes(unsigned);            
    var dst:ByteArray = new ByteArray();            
    var hash:SHA1 = new SHA1();
    src = hash.hash(src);                       
    var rsa:RSAKey = PEM.readRSAPrivateKey(privatekey);
    trace(rsa.dump());
    rsa.sign(src, dst, src.length);
    dst.position = 0;           
    signature = Base64.encodeByteArray(dst);                            
    signature = signature.split("+").join("-");
    signature = signature.split("=").join("_");
    signature = signature.split("\/").join("~");
    signed = resource+'?Expires=' +expires+ '&Signature=' +signature+ '&Key-Pair-Id=' +key; 

    return signed;
}

两个函数(PHP和Flex)的输出格式相同。但是,当我使用Flex函数中的签名URL时,流不起作用。

我用于 openssl_sign() php函数的替代方法是来自as3crypto库的 sign()函数。也许这是问题?也许加密是不同的。

1 个答案:

答案 0 :(得分:0)

不幸的是,as3crypto的 RSAKey.sign()与php的 openssl_sign()的功能不同。他们的输出是不同的签名。因此我决定调用远程php函数来生成我的签名。它现在有效!