Extracting public key from certificate

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Extracting public key from certificate

Arsen Hayrapetyan-2
I have the public key certificate in cert.pem and I want to extract the public key and store it in file pubkey.pem. I did it with the following command: (openssl v.0.9.7a)

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

However the following command did the strange things:
openssl x509 -in cert.pem -pubkey -noout -out pubkey.pem

It  ignored the "-out pubkey" and printed the public key to STDOUT.

Also, the -pubkey option hasn't been listed in the list of options of x509 command (http://www.openssl.org/docs/apps/x509.html#). Maybe it corresponds to the latest openssl v.0.9.8, but that option hasn't been listed also in "man page" for openssl v.0.9.7a.

Can anybody explain this behaviour?


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