General OpenSSL Commands

===Generate a new private key and Certificate Signing Request===

openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privateKey.key

===Generate a self-signed certificate (see How to Create and Install an Apache Self Signed Certificate for more info)===

openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout privateKey.key -out certificate.crt

===Generate a certificate signing request (CSR) for an existing private key===

openssl req -out CSR.csr -key privateKey.key -new

===Generate a certificate signing request based on an existing certificate===

openssl x509 -x509toreq -in certificate.crt -out CSR.csr -signkey privateKey.key

===Remove a passphrase from a private key===

openssl rsa -in privateKey.pem -out newPrivateKey.pem

==Checking Using OpenSSL==

If you need to check the information within a Certificate, CSR or Private Key, use these commands. You can also check CSRs and check certificates using our online tools.

===Check a Certificate Signing Request (CSR)===

openssl req -text -noout -verify -in CSR.csr

===Check a private key===

openssl rsa -in privateKey.key -check

===Check a certificate===

openssl x509 -in certificate.crt -text -noout

===Check a PKCS#12 file (.pfx or .p12)===

openssl pkcs12 -info -in keyStore.p12