(VBScript) Extract a File from a .p7m (PKCS7 Signed-Data)

VBScript example to extract the original file from a .p7m (Signed-Data PKCS7 Format) The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

Download Chilkat Crypt ActiveX

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
Set outFile = fso.CreateTextFile("output.txt", True)

set crypt = CreateObject("Chilkat.Crypt2")

'  Any string argument automatically begins the 30-day trial.
success = crypt.UnlockComponent("30-day trial")
If (success <> 1) Then
    outFile.WriteLine(crypt.LastErrorText)
    WScript.Quit
End If

outputFile = "/Users/chilkat/testData/pdf/sample.pdf"
inFile = "/Users/chilkat/testData/p7m/sample.pdf.p7m"

'  Verify and restore the original file:
success = crypt.VerifyP7M(inFile,outputFile)
If (success = 0) Then
    outFile.WriteLine(crypt.LastErrorText)
    WScript.Quit
End If

MsgBox "Success!"
outFile.Close