(Ruby) Decrypt a .p7m File (using a PFX)

Ruby sample code showing how to decrypt a .p7m using a .p12 / .pfx certificate w/ private key.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

crypt = Chilkat::CkCrypt2.new()

# Use a digital certificate and private key from a PFX file (.pfx or .p12).
pfxPath = "myCertAndKey.pfx"
pfxPassword = "test123"

success = crypt.AddPfxSourceFile(pfxPath,pfxPassword)
if (success != true)
    print crypt.lastErrorText() + "\n";
    exit
end

# Set the  outPath to whatever is appropriate.
# If you are decrypting a PDF, your output might be "out.pdf"...
inPath = "smime.p7m"
outPath = "original.txt"

# Indicate that we're doing public key decryption (i.e. PKCS7)
crypt.put_CryptAlgorithm("pki")

success = crypt.CkDecryptFile(inPath,outPath)
if (success == false)
    print crypt.lastErrorText() + "\n";
    exit
end

print "Success." + "\n";