get SHA256 hash of public key

openssl sha256 sha sha2
Leem picture Leem · Mar 19, 2018 · Viewed 20.5k times · Source

I have a certificate mycert.pem . I got the public key of the certificate by command:

openssl x509 -pubkey -noout -in mycert.pem  > pubkey.pem

How can I get the SHA256 hash of the public key?

Answer

uanr81 picture uanr81 · Feb 5, 2020

You can use ssh-keygen. Convert file format first

ssh-keygen -i -m PKCS8 -f pubkey.pem > NEWpubkey.pem

Next get the fingerprint

ssh-keygen -lf NEWpubkey.pem

Get type inference

2048 SHA256:hYAU9plz1WZ+H+eZCushetKpeT5RXEnR8e5xsbFWRiU no comment (RSA)

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