AS3 RSAKey.sign() != PHP openssl_sign() - php

Question

everyone!
I have some PHP code to sign some text and it works fine. I need to have equivalent of this code on actionscript 3. I need your help.
$privateKeyPath = "private.key";
$message = "hello";
$privateKey = file_get_contents($privateKeyPath);
openssl_sign($message, $signature, $privateKey);
echo base64_encode($signature);
In AS3 I using as3crypto library to make sign:
private function readPrivateKey():String {
var f:File = new File("/Users/ivan/Desktop/private.key");
var fs:FileStream = new FileStream();
fs.open(f,FileMode.READ);
var key:String = fs.readUTFBytes(fs.bytesAvailable);
fs.close();
return key;
}
private function getSign():void {
var message:String = "hello";
var privateKey:String = readPrivateKey();
var srcBA:ByteArray = new ByteArray();
var resultBA:ByteArray = new ByteArray();
var rsaKey:RSAKey;
var base64encoder:Base64Encoder = new Base64Encoder();
srcBA.writeUTFBytes(message);
rsaKey = PEM.readRSAPrivateKey(privateKey);
rsaKey.sign(srcBA, resultBA, srcBA.length);
b64encoder.encodeBytes(resultBA);
trace(b64encoder.toString());
}
I have same private key file. I expect that the output values are equals. But these values are different =(
What am I doing wrong?
UPDATE: I tried to verify my encoded base64 string using public key and verify method - everything is ok inside Actionscript.
Example:
var text:String = "hello";
var srcBA:ByteArray;
var desBA:ByteArray;
var rsaKey:RSAKey;
var encodedB64:String;
// ENCODING
srcBA = new ByteArray();
srcBA.writeUTFBytes(text);
desBA = new ByteArray();
rsaKey = PEM.readRSAPrivateKey( readPrivateKey() );
rsaKey.sign(srcBA, desBA, srcBA.length);
encodedB64 = Base64.encodeByteArray(desBA);
trace("Original: " + text);
trace("Encoded: " + encodedB64 );
// DECODING
var srcBA2:ByteArray = new ByteArray();
var desBA2:ByteArray = new ByteArray();
var rsaKey2:RSAKey = PEM.readRSAPublicKey( readPublicKey() );
srcBA2 = Base64.decodeToByteArray( encodedB64 );
rsaKey2.verify(srcBA2, desBA2, srcBA2.length);
trace("Decoded: " + desBA2.toString() );
My original text and decoded value are equals. So, I conclude that AS3 signing methods are different than PHP.
Is anyone have idea to make it equals?
Thanks.

Answer 1

Maybe it's late answer, but anyway...
AS3 works fine in your second code, PHP needs some tweaks, like this:
$privateKeyPath = "private.key";
$message = "hello";
$privateKey = openssl_pkey_get_private(file_get_contents($privateKeyPath));
openssl_private_encrypt($message, $signature, $privateKey);
echo base64_encode($signature);
I just checked with key genereted on this site:
http://www.selfsignedcertificate.com/ and everything works fine, I'm getting similar results in both PHP and AS3 versions.