The equivalent of C# ASCII code in PHP language

Question

I want to implement this block code in PHP for bank payment. Can anyone help me? Thank you.

ASCIIEncoding ByteConverter = new ASCIIEncoding();

string dataString = "Data to Sign";
‬
byte[] originalData = ByteConverter.GetBytes(dataString);

byte[] signedData;

RSACryptoServiceProvider RSAalg = new RSACryptoServiceProvider();

String PrivateKey= File.ReadAllText(Application.StartupPath + "\\PrivateKey.xml");

RSAalg.FromXmlString(PrivateKey);

signedData = Key.SignData(originalData,SHA1.Create());

String base64String = Convert.ToBase64String(signedData, 0, signedData.Length);
‬

I have tried , but I did not get any results. I get an sign error as a result of the request.

$baseString = "Data to Sign";
$signedData = null;
$privateKey = file_get_contents(config_path("PrivateKey.pem"));
$privateKeyResource = openssl_pkey_get_private($privateKey);

$signature = null;

if (openssl_sign($baseString, $signedData, $privateKeyResource, OPENSSL_ALGO_SHA1))
            $signature = base64_encode($signedData);

If you get an error, you need to tell us exactly what it says, and which code line caused it. Please edit your question. — ADyson
– ADyson, Commented Jul 16, 2023 at 8:02
In the PHP code, sign $baseString and not $originalData. If the keys are identical (PrivateKey.xml in XML format and PrivateKey.pem in PEM encoding) both codes generate the same signature. If not, check if the keys are really identical. — Topaco
– Topaco, Commented Jul 16, 2023 at 8:19

Grigory Ilizirov · Accepted Answer · 2023-07-16 22:36:26Z

0

My guess is wrong encoding of dataString / $baseString

The default string encoding in C# is UTF-16, in php however the encoding of a string is automatically ASCII, yet if not supported char appear in the string the encoding changed automatically to UTF-8 - so it depends what string the $baseString contain, you can check with mb_detect_encoding method if the encoding is still ASCII as expected.

answered Jul 16, 2023 at 22:36

Grigory Ilizirov

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