Create PKCS7 Attached/Opaque Signature (S/MIME)

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

Download Chilkat MIME ActiveX

LOCAL loMime
LOCAL lnSuccess
LOCAL loCert

loMime = CreateObject('Chilkat.Mime')

lnSuccess = loMime.UnlockComponent("Anything for 30-day trial")
IF (lnSuccess = 0) THEN
    ? loMime.LastErrorText
    QUIT
ENDIF

*  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.
*  For this example, we'll use a pre-installed cert from
*  a certificate store.
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadByCommonName("Chilkat Software, Inc.")
IF (lnSuccess = 0) THEN
    ? loCert.LastErrorText
    QUIT
ENDIF

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

*  Examine the MIME prior to signing:
? "--- MIME prior to signing ---"
? loMime.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:
loMime.SigningHashAlg = "SHA256"

*  Convert the MIME to PKCS7 signed-data.
lnSuccess = loMime.ConvertToSigned(loCert)
IF (lnSuccess = 0) THEN
    ? loMime.LastErrorText
    QUIT
ENDIF

*  Examine the signed MIME
? "--- MIME converted to PKCS7 signed-data ---"
? loMime.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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*  -------------------------------------------------------------------------------