Converting .P7B (PKCS#7) to .PFX / .P12 (PKCS#12) file format

Both PKCS#12 and .PFX also contain a Private Key, which is typically only known by the client (not the CA!). - Therefore the CA cannot deliver a  .PFX/PKCS#12 file, but usually delivers X.509 .CRT files - possibly PKCS#7 (.P7B) for Windows/IIS servers.

In order to successfully convert a .p7b into .p12 or .pfx, you will require your private key and can use one of the following methods:

a) InterSSL PFX Converter

https://www.interssl.com/de/ssl-tools-pfxconverter.php

b) OPENSSL: (Windows, Linux, OSX)

openssl pkcs7 -print_certs -in certificate.p7b -out certificate.cer
openssl pkcs12 -export -in certificate.cer -inkey privateKey.key -out certificate.pfx -certfile CACert.cer

 

c) Alternatively: Microsoft offers a converter tool for Windows via MSDN:

https://msdn.microsoft.com/windows/hardware/drivers/devtest/pvk2pfx

pvk2pfx -pvk mypvkfile.pvk -pi mypassword -spc myspcfile.spc -pfx mypfxfile.pfx -f

same command but alternate file naming conventions:

pvk2pfx -pvk mypvkfile.key -pi mypassword -spc myspcfile.crt -pfx mypfxfile.pfx -f
 

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