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Xojo Plugin Examples


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(Xojo Plugin) Create PKCS7 Attached/Opaque Signature (S/MIME)

Create an S/MIME message with a PKCS7 attached/opaque signature.

Chilkat Xojo Plugin Download

Xojo Plugin for Windows, Linux, Mac OS X, and ARM

Dim mime As New Chilkat.Mime

Dim success As Boolean
success = mime.UnlockComponent("Anything for 30-day trial")
If (success = False) Then
    System.DebugLog(mime.LastErrorText)
    Return
End If

//  Load a certificate w/ private key for signing.
//  There are many ways of getting a certificate object:
//  from a pfx file, from .cer and private-key files, from the
//  Windows registry-based certificate stores, etc.
//  Load a PFX file into a certificate object.
Dim cert As New Chilkat.Cert
Dim pfxFilepath As String
pfxFilepath = "pfxFiles/something.pfx"
Dim pfxPassword As String
pfxPassword = "secret"
success = cert.LoadPfxFile(pfxFilepath,pfxPassword)
If (success = False) Then
    System.DebugLog(cert.LastErrorText)
    Return
End If

//  Create a very simple MIME message to be signed:
success = mime.AddHeaderField("Subject","This is a test")
success = mime.AddHeaderField("MyCustomHeader","abc123")
mime.ContentType = "text/plain"
mime.SetBody "This is a plain-text body."

//  Examine the MIME prior to signing:
System.DebugLog("--- MIME prior to signing ---")
System.DebugLog(mime.GetMime())

//  The MIME prior to signing looks like this:
//  -------------------------------------------------------------------------------

/*
Subject: This is a test
MyCustomHeader: abc123
Content-Type: text/plain

This is a plain-text body.
*/
//  -------------------------------------------------------------------------------

//  The default hash algorithm used in the signing process is "SHA1".
//  To change it, set the SigningHashAlg property:
mime.SigningHashAlg = "SHA256"

//  Convert the MIME to PKCS7 signed-data.
success = mime.ConvertToSigned(cert)
If (success = False) Then
    System.DebugLog(mime.LastErrorText)
    Return
End If

//  Examine the signed MIME
System.DebugLog("--- MIME converted to PKCS7 signed-data ---")
System.DebugLog(mime.GetMime())

//  The MIME after signing looks like this:
//  -------------------------------------------------------------------------------

/*

Subject: This is a test
MyCustomHeader: abc123
Content-Disposition: attachment; filename="smime.p7m";
Content-Transfer-Encoding: base64
Content-Type: application/x-pkcs7-mime;
 name="smime.p7m"; smime-type="signed-data";

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*/
//  -------------------------------------------------------------------------------

 

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