(Xojo Plugin) Duplicate OpensSSL to Sign File and Output Binary DER

This example duplicates the following:

openssl smime -sign -in INPUT.xml -signer SIGN.PEM -passin pass:MYPASS -outform der -binary -nodetach -out SIGNED.P7M

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

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

Dim crypt As New Chilkat.Crypt2

// Load the PEM containing cert + private key.
Dim pem As New Chilkat.Pem
Dim success As Boolean
success = pem.LoadPemFile("qa_data/pem/myPem.pem","password")
If (success <> True) Then
    System.DebugLog(pem.LastErrorText)
    Return
End If

Dim privkey As Chilkat.PrivateKey
privkey = pem.GetPrivateKey(0)
If (pem.LastMethodSuccess <> True) Then
    System.DebugLog(pem.LastErrorText)
    Return
End If

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

    System.DebugLog(pem.LastErrorText)
    Return
End If

success = crypt.SetSigningCert2(cert,privkey)
If (success <> True) Then

    System.DebugLog(crypt.LastErrorText)
    Return
End If

// Alternatively, we could use a .pfx/.p12 file.
// (Chilkat also supports other formats/sources for cert/private keys...)
Dim certFromP12 As New Chilkat.Cert
success = certFromP12.LoadPfxFile("qa_data/p12/myP12.p12","password")
If (success <> True) Then
    System.DebugLog(certFromP12.LastErrorText)
    Return
End If

// The certificate, when loaded from a .pfx/.p12, will automatically 
// include the associated private key, assuming it's present in the .p12.
// We don't have to explicitly provide the private key as in the
// lines of code above that use the PEM file.
success = crypt.SetSigningCert(certFromP12)
If (success <> True) Then
    System.DebugLog(crypt.LastErrorText)
    Return
End If

// Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
success = crypt.CreateP7M("qa_data/infile.anything","qa_output/outfile.p7m")
If (success <> True) Then
    System.DebugLog(crypt.LastErrorText)
    Return
End If

System.DebugLog("Success.")