Question

How to convert pkcs8 key file to DER format, to get Private and Public key in Xml format?

with openssl I can do it using:
openssl pkcs8 -inform DER -in aaa010101aaa_FIEL.key -out aaa.txt

aaa010101aaa_FIEL.key is bynary file

I’m trying to do it with Bouncy Castle library but I have problems to create new EncryptedPrivateKeyInfo(…

there is a post to do that in java, but i need it in c#
How to read a password encrypted key with java?

Answer 1

I found the Answer!

            byte[] dataKey = File.ReadAllBytes(fileName);

        Org.BouncyCastle.Crypto.AsymmetricKeyParameter asp =
            Org.BouncyCastle.Security.PrivateKeyFactory.DecryptKey(pass.ToCharArray(), dataKey);

        MemoryStream ms = new MemoryStream();
        TextWriter writer = new StreamWriter(ms);
        System.IO.StringWriter stWrite = new System.IO.StringWriter();
        Org.BouncyCastle.OpenSsl.PemWriter pmw = new PemWriter(stWrite);
        pmw.WriteObject(asp);
        stWrite.Close();
        return stWrite.ToString();

How to Load pkcs8 binary file format key