PKCS7 Decrypt MIME

Loads a PKCS7 encrypted MIME file and decrypts.

Downloads for Windows/Linux and Install Instructions

require 'rubygems'
require 'chilkat'

mime = Chilkat::CkMime.new()

success = mime.UnlockComponent("Anything for 30-day trial.")
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
end

#  Load the MIME
success = mime.LoadMimeFile("encrypted.mim")
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
end

#  Decrypt...
success = mime.Decrypt()
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
end

#  Display the decrypted MIME:
print mime.getMime() + "\n";

#  How is it possible to magically decrypt with no information?
#  Answer: It is possible to decrypt if the certificate with private key
#  needed for decryption was previously installed onto the
#  Windows computer.  PKCS7 encrypted (enveloped) data always
#  includes information about the certificate required for
#  decryption.  Chilkat uses it to automatically search the
#  Windows registry-based certificate stores to find the
#  certificate.

#  If the certificate required for decryption was not installed, but
#  you have a PFX file containing the cert + private key,
#  then it may be used like this:

#  The AddPfxSourceFile and/or AddPfxSourceData
#  methods may be called one or more times (one per PFX)
#  to add sources from which the MIME component will
# search for certificates and private keys when decrypting.
pfxPassword = "myPassword"
success = mime.AddPfxSourceFile("myCertAndPrivateKey.pfx",pfxPassword)
if (success == false)
    print mime.lastErrorText() + "\n";
    exit
end

#  Now call Decrypt, and it will search the PFX sources
#  previously added...