Openssl

General OpenSSL Commands
 
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 privateKey.key
 
    Generate a self-signed certificate (see How to Create and Install an Apache Self Signed Certificate for more info)
 
    openssl req -x509 -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