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webprofusion-chrisc/validate-cert-and-key.md

Last active May 8, 2024 08:21
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Checking a cert and private key match using OpenSSL, the right way
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validate-cert-and-key.md

If you google how to validate a cert and private key match most examples are RSA specific and use modulus output.

Those examples look something like: openssl x509 -in cert.pem -noout -modulus | openssl sha1

Instead use the proper OpenSSL public key support:

  • Check public key of certificate: openssl x509 -noout -pubkey -in cert.pem
  • Check public key based on private key: openssl pkey -pubout -in key.pem
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