Lianja

Add a Detached Signature (Separate Key, Header Control)

Demonstrates the Chilkat Mime.AddDetachedSignaturePk2 method, which creates a detached signature with a separately supplied certificate and private key, and a third argument controlling transfer of the existing message header fields to the new outer entity.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This combines the two variations — certificate and key supplied separately, plus explicit header placement — for the case that needs both. It is the most flexible of the detached-signature methods; choose it when your key material is separate and you also care about where the message headers end up on the signed result.

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llSuccess = .F.

loMime = createobject("CkMime")
llSuccess = loMime.SetBodyFromPlainText("This message will be signed.")
if (llSuccess = .F.) then
    ? loMime.LastErrorText
    release loMime
    return
endif

//  Load the certificate and its private key separately.
loCert = createobject("CkCert")
llSuccess = loCert.LoadFromFile("qa_data/signer.cer")
if (llSuccess = .F.) then
    ? loCert.LastErrorText
    release loMime
    release loCert
    return
endif

loPrivKey = createobject("CkPrivateKey")
llSuccess = loPrivKey.LoadPemFile("qa_data/signer_privkey.pem")
if (llSuccess = .F.) then
    ? loPrivKey.LastErrorText
    release loMime
    release loCert
    release loPrivKey
    return
endif

//  Create a detached signature with separately supplied cert and private key, where the 3rd
//  argument controls whether the existing message header fields are transferred to the new outer
//  multipart/signed entity.
llTransferHeaderFields = .T.
llSuccess = loMime.AddDetachedSignaturePk2(loCert,loPrivKey,llTransferHeaderFields)
if (llSuccess = .F.) then
    ? loMime.LastErrorText
    release loMime
    release loCert
    release loPrivKey
    return
endif

llSuccess = loMime.SaveMime("qa_output/signed.eml")
if (llSuccess = .F.) then
    ? loMime.LastErrorText
    release loMime
    release loCert
    release loPrivKey
    return
endif

? "Detached signature added (headers transferred)."


release loMime
release loCert
release loPrivKey