Convert Certificate from PEM to DER

Convert a PEM formatted certificate file (.cer, .crt, .pem) to DER format (.cer, .der). The Chilkat certificate class/object is a freeware component that is included in many of the Chilkat downloads.

Download Chilkat Ruby Library

require 'chilkat'

cert = Chilkat::CkCert.new()

#  LoadFromFile will load either PEM and DER formatted files.
#  It automatically recognizes the file format based on the
#  file contents.
success = cert.LoadFromFile("chilkat.crt")
if (success != true)
    print cert.lastErrorText() + "\n"
    exit
end

print cert.subjectDN() + "\n"

success = cert.ExportCertDerFile("chilkat.der")
if (success != true)
    print cert.lastErrorText() + "\n"
    exit
end

print "success!" + "\n"