These commands allow you to generate CSRs, Certificates, Private Keys and do other miscellaneous tasks.
# Generate a new private key and Certificate Signing Request. openssl req -out csr.csr -new -newkey rsa:2048 -nodes -keyout key.key -subj "/C=BE/ST=Brussels Area/L=Brussles/O=Datalayer/OU=Data Analytics/CN=local.whoami.datalayer.io" # Generate a self-signed certificate. openssl req -x509 -sha256 -nodes -days 365 -newkey rsa:2048 -keyout privateKey.key -out certificate.crt -subj "/C=BE/ST=Brussels Area/L=Brussles/O=Datalayer/OU=Data Analytics/CN=local.whoami.datalayer.io" # 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
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
If you are receiving an error that the private doesn't match the certificate or that a certificate that you installed to a site is not trusted, try one of these commands.
If you are trying to verify that an SSL certificate is installed correctly, be sure to check out the SSL Checker.
# 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 www.paypal.com:443
These commands allow you to convert certificates and keys to different formats to make them compatible with specific types of servers or software.
For example, you can convert a normal PEM file that would work with Apache to a PFX (PKCS#12) file and use it with Tomcat or IIS. Use our SSL Converter to convert certificates without messing with 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 # You can add -nocerts to only output the private key or add -nokeys to only output the certificates. # 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