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(Excel) Extract PKCS7 from MIME and Decrypt

Extracts the base64-encoded PKCS7 body of a MIME message to a file, and then decrypts using Chilkat Crypt2.

Download Excel Class Modules

Chilkat Excel Class Modules

Dim mime As Chilkat.Mime
Set mime = Chilkat.NewMime

Dim success As Boolean
success = mime.UnlockComponent("Anything for 30-day trial")
If (success = False) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

success = mime.LoadMimeFile("c:/aaworkarea/EmailInBytes.txt")
If (success <> True) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

success = mime.SaveBody("c:/aaworkarea/smime.p7m")
If (success <> True) Then
    Debug.Print mime.LastErrorText
    Exit Sub
End If

Dim crypt As Chilkat.Crypt2
Set crypt = Chilkat.NewCrypt2

success = crypt.UnlockComponent("Anything for 30-day trial")
If (success = False) Then
    Debug.Print crypt.LastErrorText
    Exit Sub
End If

success = crypt.AddPfxSourceFile("c:/aaworkarea/my.pfx","pfxPassword")
If (success = False) Then
    Debug.Print crypt.LastErrorText
    Exit Sub
End If

'  Indicate the public-key (PKCS7) encryption/decryption should be used:
crypt.CryptAlgorithm = "pki"

Dim inPath As String
inPath = "c:/aaworkarea/smime.p7m"
Dim outPath As String
outPath = "c:/aaworkarea/decrypted.dat"

success = crypt.CkDecryptFile(inPath,outPath)
If (success = False) Then
    Debug.Print crypt.LastErrorText
    Exit Sub
End If

Debug.Print "Success."

 

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