VB.NET

Duplicate OpensSSL Command that Decrypts Binary DER

See more OpenSSL Examples

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).

VB.NET

Dim success As Boolean = False

' 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
success = pem.LoadPemFile("qa_data/pem/myPem.pem","password")
If (success = False) Then
    Debug.WriteLine(pem.LastErrorText)
    Exit Sub
End If


Dim privkey As New Chilkat.PrivateKey
success = pem.PrivateKeyAt(0,privkey)
If (success = False) Then
    Debug.WriteLine(pem.LastErrorText)
    Exit Sub
End If


Dim cert As New Chilkat.Cert
success = pem.CertAt(0,cert)
If (success = False) Then
    Debug.WriteLine(pem.LastErrorText)
    Exit Sub
End If


success = crypt.SetDecryptCert2(cert,privkey)
If (success = False) Then
    Debug.WriteLine(crypt.LastErrorText)
    Exit Sub
End If


success = crypt.CkDecryptFile("qa_data/infile.enc","qa_output/outfile.dat")
If (success = False) Then
    Debug.WriteLine(crypt.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("Success.")