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convertPEMtoDER.md

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convertPEMtoDER.sh

Purpose

This bash script converts a SSL certificate from PEM-format into DER-format.
DER is a binary format primarily used by Micosoft, PEM is an ASCII representation for binary data.

Command format

convertPEMtoDER.sh <PEM-filename> <DER-filename>
  • if <PEM-filename> is "-" (the minus sign), the PEM certificate is expected on stdin,
    otherwise it must be a file containing the PEM encoded certificate.
  • <DER-filename> is the name of the file the DER encoded certificate is written to.
  • This scipt won't override the output file!
    If the <DER-filename> already exist, the script will stop.

Some explanations

openssl x509

  • This command will handle certificates, e.g. convert them or displays information coded into the certificate.
  • It has options for the handling of it's input:
    • -in <filename> set the filename from which to fetch the certificate.
      If ommitted it will use stdin.
    • -inform PEM (default if ommitted) expects the certificate in PEM format.
    • -inform DER expects the certificate in DER format.
  • Options for the handling of it's output are:
    • -out <filename> set the filename where to write the certificate to.
      If ommitted it will use stout.
    • -outform PEM (default if ommitted) writes the in PEM format.
    • -outform DER writes the certificate in DER format.