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Creating Selfsigned Certificate with an Existing Key

Most OpenSSL documentation out there only shows you how to create a new key and signs it with in single command.  I wanted to use a self-signed in the interm while waiting for my third-party CA approve my certificate. I already had an existing key.   Here is the command to create a self-signed certificate from an existing RSA key.

#> openssl req -x509 -new -key {KEYFILE} -out {SELFSIGNEDCERT}