(PowerShell) Create PKCS7 Signed File (.p7m)

Demonstrates how to sign a file to create a .p7m that contains both the file contents and the signature.

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

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

$crypt = New-Object Chilkat.Crypt2

$certStore = New-Object Chilkat.CertStore

# Load a PFX file into a certificate store object.
$success = $certStore.LoadPfxFile("myPfx.pfx","pfxPassword")
if ($success -ne $true) {
    $($certStore.LastErrorText)
    exit
}

# Get the certificate by subject common name.
# This should be the cert within the PFX that also
# has a private key (also stored within the PFX).
$cert = $certStore.FindCertBySubjectCN("myCert")
if ($certStore.LastMethodSuccess -eq $false) {
    $($certStore.LastErrorText)
    exit
}

# Tell the crypt object to use the certificate for signing:
$success = $crypt.SetSigningCert($cert)

# Sign a file, producing a .p7m as output.
# The input file is unchanged, the test.p7m contains the 
# contents of the input file and the signature.
$inFile = "test.txt"
$outFile = "testp7m"
$success = $crypt.CreateP7M($inFile,$outFile)
if ($success -ne $true) {
    $($crypt.LastErrorText)
    exit
}

$("Success!")