Whenever a certificate needs to be renewed, I always have to scramble to remember how to update/renew. I finally put a cheat sheet together.
I decided I will do all cert related stuff form Linux. Here are some commands:
To request a new csr with a new key:
openssl req -newkey rsa:2048 -keyout yourcompany.com.key -out yourcompany.com.csr Generating a 2048 bit RSA private key .............................................................................................+++ .............+++ writing new private key to 'stratgovadvisors.com' Enter PEM pass phrase: Verifying - Enter PEM pass phrase: ----- You are about to be asked to enter information that will be incorporated into your certificate request. What you are about to enter is what is called a Distinguished Name or a DN. There are quite a few fields but you can leave some blank For some fields there will be a default value, If you enter '.', the field will be left blank. ----- Country Name (2 letter code) [AU]:US State or Province Name (full name) [Some-State]:New York Locality Name (eg, city) []:New York Organization Name (eg, company) [Internet Widgits Pty Ltd]:Your Company name Organizational Unit Name (eg, section) []:IT Common Name (e.g. server FQDN or YOUR name) []:*.yourcompany.com Email Address []: Please enter the following 'extra' attributes to be sent with your certificate request A challenge password []: An optional company name []:
To request a new csr with an existing key:
openssl req -new -key yourcompany.com.key -out yourcompany.com.csr
To make a PFX form a Private key and a cert:
openssl pkcs12 -export -out yourcompany.com.pfx -inkey yourcompany.com.key -in yourcompany.com.crt
To extract Private key and Cert from a PFX (3 steps)
Export the private key
openssl pkcs12 -in yourcompany.com.pfx -nocerts -out yourcompany.com.pem -nodes
Export the certificate
openssl pkcs12 -in yourcompany.com.pfx -nokeys -out yourcompany.com.crt
Remove the passphrase from the private key
openssl rsa -in yourcompany.com.pem -out yourcompany.com.key
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