rsa.ImportFromPem(privateKeyString) throws strange error in ASP.NET Core 6.0 Web API [closed]

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using (RSA rsa = RSA.Create()) 
{
    rsa.ImportFromPem(privateKeyString);
    byte[] dataToSign = Encoding.UTF8.GetBytes(signData);
    byte[] signedData = rsa.SignData(dataToSign, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
    signatureBase64 = Convert.ToBase64String(signedData);
}

This code works fine as a Windows Forms application in .NET 6.0. However, it throws a strange error:

The system cannot find the file specified

in an ASP.NET Core 6.0 Web API.

privateKeyString is of the form

-----BEGIN PRIVATE KEY----- 
..... 
-----END PRIVATE KEY-----

Where is my mistake?

Please edit your post to include the full complete error message you get. Also add a minimal reproducible example, which produce the error. Also add the .csproj file, so we see which packages you have installed. — Progman
– Progman, Commented Sep 13 at 11:07
There is no "file" in your code snippet, so it's unlikely the error is coming from it. In addition to the necessary advice in the previous comment, run the debugging version of your code so that the complete error message contains source code line numbers to pinpoint the problem line. — President James K. Polk
– President James K. Polk, Commented Sep 13 at 12:53

Orgil · Accepted Answer · 2025-09-13 15:58:04Z

0

From the comments, I realized maybe it is just outdated library issue, aaand it was. I changed my project from .net 6.0 to .net 8.0 and updated libraries accordingly then the code works fine. Thanks "President James K. Polk" and "Progman" for comments

answered Sep 13 at 15:58

Orgil

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