PureBasic
PureBasic
Create PKCS7 Attached/Opaque Signature (S/MIME)
See more MIME Examples
Create an S/MIME message with a PKCS7 attached/opaque signature.Chilkat PureBasic Downloads
IncludeFile "CkCert.pb"
IncludeFile "CkMime.pb"
Procedure ChilkatExample()
success.i = 0
; This example requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.
mime.i = CkMime::ckCreate()
If mime.i = 0
Debug "Failed to create object."
ProcedureReturn
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.
; Load a PFX file into a certificate object.
cert.i = CkCert::ckCreate()
If cert.i = 0
Debug "Failed to create object."
ProcedureReturn
EndIf
pfxFilepath.s = "pfxFiles/something.pfx"
pfxPassword.s = "secret"
success = CkCert::ckLoadPfxFile(cert,pfxFilepath,pfxPassword)
If success = 0
Debug CkCert::ckLastErrorText(cert)
CkMime::ckDispose(mime)
CkCert::ckDispose(cert)
ProcedureReturn
EndIf
; Create a very simple MIME message to be signed:
success = CkMime::ckAddHeaderField(mime,"Subject","This is a test")
success = CkMime::ckAddHeaderField(mime,"MyCustomHeader","abc123")
CkMime::setCkContentType(mime, "text/plain")
CkMime::ckSetBody(mime,"This is a plain-text body.")
; Examine the MIME prior to signing:
Debug "--- MIME prior to signing ---"
Debug CkMime::ckGetMime(mime)
; 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:
CkMime::setCkSigningHashAlg(mime, "SHA256")
; Convert the MIME to PKCS7 signed-data.
success = CkMime::ckConvertToSigned(mime,cert)
If success = 0
Debug CkMime::ckLastErrorText(mime)
CkMime::ckDispose(mime)
CkCert::ckDispose(cert)
ProcedureReturn
EndIf
; Examine the signed MIME
Debug "--- MIME converted to PKCS7 signed-data ---"
Debug CkMime::ckGetMime(mime)
; 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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;
; ------------------------------------------------------------------------------
CkMime::ckDispose(mime)
CkCert::ckDispose(cert)
ProcedureReturn
EndProcedure