One of the most versatile SSL tools is OpenSSL which is an open source implementation of the SSL protocol. There are versions of OpenSSL for nearly every platform, including Windows, Linux, and Mac OS X. OpenSSL is commonly used to create the CSR and private key for many different platforms, including Apache. However, it also has hundreds of different functions that allow you to view the details of a CSR or certificate, compare an MD5 hash of the certificate and private key to make sure they match, verify that a certificate is installed properly on any website, and convert the certificate to a different format.
A compiled version of OpenSSL for Windows can be found here: http://www.slproweb.com/products/Win32OpenSSL.html.
General OpenSSL Commands
These commands allow you to generate CSRs, Certificates, and Private Keys, and do other miscellaneous tasks.
- 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
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 You can use an SSL Converter to to convert certificates without messing with 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
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