how to using public key and CERTIFICATE_SIGNATURE

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Hello,

I need help working with a public key and a certificate signature.

My Input:

  1. I have a public key in this format:

    -----BEGIN PUBLIC KEY-----
MDYwEAYHKoZIzj0CAQYFK4EEAAoDIgACXP5Jiehe3OkfOUPjfr+gJOj8LO4Fclwi
3GaNXipE5bE=
-----END PUBLIC KEY-----

    or as a Base64 string:

    MDYwEAYHKoZIzj0CAQYFK4EEAAoDIgACXP5Jiehe3OkfOUPjfr+gJOj8LO4Fclwi3GaNXipE5bE=

  2. I also have a CERTIFICATE_SIGNATURE that I need to process.

Problem:

I want to convert the public key and the certificate signature into usable formats in C#. For the public key, I tried the following code, but it doesn’t work as expected:

string PublicKey1 = "MFYwEAYHKoZIzj0CAQYFK4EEAAoDQgAEXP5Jiehe3OkfOUPjfr+gJOj8LO4Fclwi3GaNXipE5bGdFRjSPLapkhWnzqRYX6KtMRx4nXJzRCU7HrWmtdRkUA==";
byte[] data1 = Convert.FromBase64String(PublicKey1);
string res1 = Encoding.UTF8.GetString(data1);
var tag8 = $"{(char)8}{(char)Encoding.UTF8.GetByteCount(res1)}{res1}";

Request:

  • Could you help me correct the code or suggest an alternative approach?
  • If possible, provide code for converting public key or certificate signature in any programming language.

Thanks in advance!