How to convert an ECDSA secp256k1 PEM formatted private key to binary?

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I am trying to import my secp256k1 private key into AWS KMS. My key is PEM formatted and AWS KMS says 'The key material must be in binary format' . How do I go about converting my ECDSA secp256k1 PEM formatted private key to binary?

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Priyesh Shah On

For others who are looking, found this on GCP.

openssl pkcs8 -topk8 -nocrypt -inform PEM -outform DER \
    -in /path/to/asymmetric-key-pem \
    -out /path/to/formatted-key