Chris Mendez in SSL, DevOps

Common Open SSL Commands


Openshift v2.0 has now reached End of Life and will be replaced by v3.0.

Below are all the commands you will need to prepare your website for SSL encryption.

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.

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

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

Debugging Using OpenSSL

Check an MD5 hash of the public key to ensure that it matches with what is in a CSR or private key.

openssl x509 -noout -modulus -in certificate.crt | openssl md5
openssl rsa -noout -modulus -in privateKey.key | openssl md5
openssl req -noout -modulus -in CSR.csr | openssl md5

Check an SSL connection. All the certificates (including Intermediates) should be displayed.

openssl s_client -connect

Converting Using OpenSSL

Convert a DER file (.crt .cer .der) to PEM.

openssl x509 -inform der -in certificate.cer -out certificate.pem

Convert a PEM file to DER.

openssl x509 -outform der -in certificate.pem -out certificate.der

Convert a PKCS#12 file (.pfx .p12) containing a private key and certificates to PEM.

openssl pkcs12 -in keyStore.pfx -out keyStore.pem -nodes

Convert a PEM certificate file and a private key to PKCS#12 (.pfx .p12).

openssl pkcs12 -export -out certificate.pfx -inkey privateKey.key -in certificate.crt -certfile CACert.crt