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How to extract key parameters from an RSA key?

I have generated a private-public keypair using the GnuPG utility. The following lists the public key. I want use this public key for my signature verification routine that I’m trying to build using Libgcrypt library in C++. However the library offers APIs that reads something called S-Expressions, in which we have to provide certain key::Listen

I have generated a private-public keypair using the GnuPG utility. The following lists the public key.

enter image description here

I want use this public key for my signature verification routine that I’m trying to build using Libgcrypt library in C++. However the library offers APIs that reads something called S-Expressions, in which we have to provide certain key parameters. For example, in this particular case, the public key should be represented as shown below.

(public-key
  (rsa
    (n n-mpi)
    (e e-mpi)))

Where the n-mpi is the RSA public modulus n, and the e-mpi is the RSA public exponent. For a private key they need additional parameters such as d-mpi (RSA secret exponent) or p-mpi (RSA secret prime) etc.

What is the procedure to extract these parameters from the keys?

BREAKING: ProShares follows Valkyrie in approval for listing Bitcoin Strategy ETF

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