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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?

Priyesh Shah
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  • Welcome to SO. Is this of any relevance? https://docs.aws.amazon.com/kms/latest/developerguide/importing-keys-encrypt-key-material.html – Anton Krug Apr 14 '21 at 16:54
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    Thanks @AntonKrug, I was following the same guide but it doesn't have any instructions on how to convert an existing pem key to binary. However, I found the solution and will post it as an answer for better visibility for others. – Priyesh Shah Apr 14 '21 at 23:55
  • Great you found the solution :) – Anton Krug Apr 15 '21 at 00:00

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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
Priyesh Shah
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