(AutoIt) 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.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

$oCrypt = ObjCreate("Chilkat.Crypt2")

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

$oCert = ObjCreate("Chilkat.Cert")

; Use a certificate found in the Windows certificate store.
Local $bSuccess = $oCert.LoadByCommonName("My Certificate")
If ($bSuccess <> True) Then
    ConsoleWrite($oCert.LastErrorText & @CRLF)
    Exit
EndIf

; Tell the crypt object to use the certificate.
$oCrypt.SetEncryptCert($oCert)

Local $sToBeEncrypted = "This string is to be encrypted."

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

Local $sResult = $oCrypt.EncryptStringENC($sToBeEncrypted)
If ($bSuccess <> True) Then
    ConsoleWrite($oCrypt.LastErrorText & @CRLF)
    Exit
EndIf

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

ConsoleWrite($sResult & @CRLF)

; 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=