(VB.NET UWP/WinRT) Duplicate OpensSSL Command that Decrypts Binary DER

This example duplicates the following:

openssl smime -decrypt -in INPUT_FILE -inform der -binary -out OUTPUT_FILE -recip PEM_CERT_AND_KEY -passin pass:PRIVKEY_PASSWORD

Note: Although "smime" is the OpenSSL command, we're not really dealing with S/MIME. The arguments "-inform der -binary" indicate that the input is simply the binary DER (i.e. the PKCS7 binary encrypted object). The output can be any type of file (whatever was encrypted).

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

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

Dim crypt As New Chilkat.Crypt2

crypt.CryptAlgorithm = "pki"

Dim pem As New Chilkat.Pem
Dim success As Boolean = Await pem.LoadPemFileAsync("qa_data/pem/myPem.pem","password")
If (success <> True) Then
    Debug.WriteLine(pem.LastErrorText)
    Exit Sub
End If


Dim privkey As Chilkat.PrivateKey = pem.GetPrivateKey(0)
If (pem.LastMethodSuccess <> True) Then
    Debug.WriteLine(pem.LastErrorText)
    Exit Sub
End If


Dim cert As Chilkat.Cert = pem.GetCert(0)
If (pem.LastMethodSuccess <> True) Then

    Debug.WriteLine(pem.LastErrorText)
    Exit Sub
End If


success = crypt.SetDecryptCert2(cert,privkey)
If (success <> True) Then


    Debug.WriteLine(crypt.LastErrorText)
    Exit Sub
End If





success = Await crypt.CkDecryptFileAsync("qa_data/infile.enc","qa_output/outfile.dat")
If (success <> True) Then
    Debug.WriteLine(crypt.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Success.")