(PowerShell) Encrypt File using X.509 Certificate using AES in CBC Mode

Demonstrates how to encrypt a file using an X.509 Certificate's public key, where the underlying bulk encryption algorithm is 128-bit AES in CBC mode. (The underlying bulk encryption algorithm can be specified to be other algorithms/strengths.)

Chilkat .NET Downloads Chilkat .NET Assemblies

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

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

$crypt = New-Object Chilkat.Crypt2

# Use public-key cryptography for encryption.
$crypt.CryptAlgorithm = "pki"

# Get an X.509 certificate to use for encrypting.
# Note: Chilkat provides many different ways of loading a certificate, from many different formats,
# or if on Windows, from the installed certificates on the system.
# This example simply loads a certificate from a file.
# Also, for encryption, only the public key is needed.  Digital certificates embed the public key
# within the X.509 format itself.  Therefore, if you have a certificate, you also have the public key.
$cert = New-Object Chilkat.Cert
$success = $cert.LoadFromFile("qa_data/certs/testCert.cer")
if ($success -ne $true) {
    $($cert.LastErrorText)
    exit
}

$success = $crypt.SetEncryptCert($cert)
if ($success -ne $true) {
    $($crypt.LastErrorText)
    exit
}

# Indicate the underlying bulk encryption algorithm to be used:
$crypt.Pkcs7CryptAlg = "aes"
$crypt.KeyLength = 128

# Note: When doing public-key encryption the underlying bulk symmetric cipher mode will always be CBC. (at least with Chilkat...)

# There's one last option that could be set.  If is the RSA encryption encryption/padding scheme. 
# By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to $true to
# use RSAES_OAEP.  (We'll leave it set at the default value of $false)
$crypt.OaepPadding = $false

# Everything is specified.  Now just encrypt...
# The output is PKCS7 in binary DER format.
$success = $crypt.CkEncryptFile("qa_data/hamlet.xml","qa_output/hamlet.p7")
if ($success -ne $true) {
    $($crypt.LastErrorText)
    exit
}

$("Finished.")