PowerShell

Create PKCS7 (CMS) EnvelopedData

Encrypt some data to a recipient by creating a PKCS7 (CMS) EnvelopedData structure. The data will be encrypted using a symmetric content-encryption algorithm (e.g., AES), and the randomly generated symmetric key will be encrypted using the recipient’s RSA public key extracted from their X.509 certificate. PowerShell

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

$success = $false

$crypt = New-Object Chilkat.Crypt2

# Specify the encryption to be used.
# "pki" indicates "Public Key Infrastructure" and will create a PKCS7 encrypted (enveloped-data) message.
$crypt.CryptAlgorithm = "pki"
$crypt.Pkcs7CryptAlg = "aes"
$crypt.KeyLength = 256
$crypt.OaepHash = "sha256"
$crypt.OaepPadding = $true

$cert = New-Object Chilkat.Cert

# Use a certificate found in the Windows certificate store.
$success = $cert.LoadByCommonName("My Certificate")
if ($success -ne $true) {
    $($cert.LastErrorText)
    exit
}

# Tell the crypt object to use the certificate.
$crypt.SetEncryptCert($cert)

$toBeEncrypted = "This string is to be encrypted."

# Get the result in multi-line BASE64 MIME format.
$crypt.EncodingMode = "base64_mime"
$crypt.Charset = "utf-8"

$result = $crypt.EncryptStringENC($toBeEncrypted)
if ($success -ne $true) {
    $($crypt.LastErrorText)
    exit
}

# -------------------------------------------------------------------------
# See the following example to decrypt what was created in this example
# Decrypt PKCS7 (CMS) EnvelopedData
# -------------------------------------------------------------------------

$($result)

# Sample output:

# MIICSgYJKoZIhvcNAQcDoIICOzCCAjcCAQAxggHiMIIB3gIBADCBljCBgTELMAkGA1UEBhMCSVQx
# EDAOBgNVBAgMB0JlcmdhbW8xGTAXBgNVBAcMEFBvbnRlIFNhbiBQaWV0cm8xFzAVBgNVBAoMDkFj
# dGFsaXMgUy5wLkEuMSwwKgYDVQQDDCNBY3RhbGlzIENsaWVudCBBdXRoZW50aWNhdGlvbiBDQSBH
# MwIQPCWvkSv8oQ7xRmEHJ6TzEDA8BgkqhkiG9w0BAQcwL6APMA0GCWCGSAFlAwQCAQUAoRwwGgYJ
# KoZIhvcNAQEIMA0GCWCGSAFlAwQCAQUABIIBAKqHAPQNSsQoX7B2NH7QyEOWQRsSVs8oCHXmy8f4
# MVZD2er3bvYUCIomxpwbLEAl14qjUIMynahooYGgqip7+4FqL301G+BVjZVfEhHWj+VI1dAWnWuL
# VHlvc/pbQNBWqV8rKVJsNIsuAZkdj4WSwLVKxYkYX43B8fh/g71XN2DTJu7Z/824v48KBmgpQBOT
# 2q7IcDGxNPAFN2p6eavIVGn2LvhEbf/Fszyj+GR5tMcnQP1BOLJ3s3JzUBbvj8hcZrF1Vhl9HnTU
# YQx8G/KdW1mR+Wlhl3BWoK0LYKRTbnTx2BXOs0CY1SXOAdhKr01ZYjA+xW4nGzY0lfXS9QZjh9gw
# TAYJKoZIhvcNAQcBMB0GCWCGSAFlAwQBKgQQw0xTbfmnt0zjWHo5SaQIp4AgxTVY9E/Ncqy6t+RM
# 8y4c3Av62/wB8IpPUEmtM2OeuZo=