☩ Walking in Light with Christ – Faith, Computing, Diary

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.

• 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