CODEWITHSUNDEEP
linuxsslopensslssl-certificatepki
Sato
Sato

Reputation: 8612

How to extract public key and private key from .key file?

I have a file server.key generated by openssl genrsa -out server.key 2048, which contains both public and private key.

I searched and fount that I can get public key by openssl rsa -in server.key -pubout -out key.pub

How can I get private key from server.key?

Upvotes: 3

Views: 29924

Answers (3)

f-torr
f-torr

Reputation: 21

@Sato server.key is the private key but if you are asking to view the contents of the private key file use this command:

openssl rsa -noout -text -in server.key

Upvotes: 0

Kaushal Kumar Panday
Kaushal Kumar Panday

Reputation: 2467

the .key file corresponds to the private key itself. If you open your .key file in a text editor you would see that they have -----BEGIN RSA PRIVATE KEY----- as the prefix and -----END RSA PRIVATE KEY----- as the suffix. See below for example:

-----BEGIN RSA PRIVATE KEY-----
MIIEogIBAAKCAQEAr/8dgslQvZLyDnPnBVJbihYjhPw6hUuCH1tKop5RitQuob4r
i4ixAhNyrjB3dmO39o8cG56/kb1MHszt256476LGW20Q3s902Nckc4yYqaA02XuE
...
...
rG8D6oIoim5XwtS68fHJpfvciuuE/TQcnS4Ek04jkReP1EXv2hp4CTAZ4l5Tm4HJ
oDmCiSOsQE/YjiyQp5eGFadqosOZZFU7k+8ipKIstr71kEQRiLE=
-----END RSA PRIVATE KEY-----

The command that you shared generates a public key pair from the existing private key.

openssl rsa -in server.key -pubout -out key.pub

HTH

Upvotes: 10

Kerb
Kerb

Reputation: 140

As far as i understand you can generate a public key from your private key by using openssl rsa -in server.pem -pubout > server.pub

Upvotes: 0

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