Ruby

Create CMS Signed File (PDF) with Multiple Signing Certificates

See more Digital Signatures Examples

Demonstrates how to sign a file by adding multiple signatures (multiple certificates). This example signs a PDF file to produce an output file that is a CMS signature wrapping the original PDF. (Note: This is different than modifying a PDF by injecting a signature into the PDF file format.)

Note: This example requires Chilkat v9.5.0.83 or greater.

Ruby

require 'chilkat'

success = false

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

crypt = Chilkat::CkCrypt2.new()

# ------------ This example requires Chilkat v9.5.0.83 or greater.

cert1 = Chilkat::CkCert.new()
success = cert1.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
if (success != true)
    print cert1.lastErrorText() + "\n";
    exit
end

cert2 = Chilkat::CkCert.new()
success = cert2.LoadPfxFile("qa_data/pfx/test_secret.pfx","secret")
if (success != true)
    print cert2.lastErrorText() + "\n";
    exit
end

# ------------ This example requires Chilkat v9.5.0.83 or greater.

# Tell the crypt component to use both certificates for signing. 
# When we create the signature, it will be signed by both certificates.
success = crypt.AddSigningCert(cert1)
if (success != true)
    print crypt.lastErrorText() + "\n";
    exit
end

success = crypt.AddSigningCert(cert2)
if (success != true)
    print crypt.lastErrorText() + "\n";
    exit
end

# The CadesEnabled property applies to all methods that create PKCS7 signatures. 
# To create a CAdES-BES signature, set this property equal to true. 
crypt.put_CadesEnabled(true)

crypt.put_HashAlgorithm("sha256")

# We can sign any type of file, creating a .p7s as output.
# The .p7s contains the signature and also embeds the data of the file that is signed.
inFile = "qa_data/pdf/sample.pdf"
p7sFile = "qa_output/sample.pdf.p7s"

# Create the CAdES-BES attached signature, which contains the original data.
# Note: Chilkat's function naming is not accurate.  CreateP7M creates a PKCS7 signature where the signed file
# is contained within the signature.  CreateP7S creates a detached PKCS7 signature where the signed file
# is NOT contained within the signature.  We want the data to be contained in the signature, therefore
# we call CreateP7M even though we are naming our output file .p7s.
success = crypt.CreateP7M(inFile,p7sFile)
if (success == false)
    print crypt.lastErrorText() + "\n";
    exit
end

# Verify the .p7s file and extract the original file from the .p7s. 
extractedToFilePath = "qa_output/sample.pdf"
success = crypt.VerifyP7M(p7sFile,extractedToFilePath)
if (success == false)
    print crypt.lastErrorText() + "\n";
    exit
end

print "Success!" + "\n";