B4X

Extract PKCS7 from MIME and Decrypt

See more MIME Examples

Extracts the base64-encoded PKCS7 body of a MIME message to a file, and then decrypts using Chilkat Crypt2. B4X

Dim success As Boolean = False

'  This example assumes the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

Dim mime As ChilkatMime
mime.Initialize

success = mime.LoadMimeFile("c:/aaworkarea/EmailInBytes.txt")
If success <> True Then
    Log(mime.LastErrorText)
    Return
End If


success = mime.SaveBody("c:/aaworkarea/smime.p7m")
If success <> True Then
    Log(mime.LastErrorText)
    Return
End If


Dim crypt As ChilkatCrypt2
crypt.Initialize("crypt")

success = crypt.AddPfxSourceFile("c:/aaworkarea/my.pfx", "pfxPassword")
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


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

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

success = crypt.CkDecryptFile(inPath, outPath)
If success = False Then
    Log(crypt.LastErrorText)
    Return
End If


Log("Success.")