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Add a Detached Signature with a Separate Private Key

Demonstrates the Chilkat Mime.AddDetachedSignaturePk method, which creates a detached signature using a signer certificate and its separately supplied private key. The first argument is the Cert and the second is the PrivateKey.

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: Sometimes the certificate and its private key live apart — a .cer alongside a PEM key file, for instance — rather than bundled in a single PFX. This method pairs them explicitly for signing, whereas AddDetachedSignature expects a Cert that already provides its key. The result is the same multipart/signed message.

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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 when the certificate and private key are supplied separately.  The
//  1st argument is the signer certificate and the 2nd is its private key.
llSuccess = loMime.AddDetachedSignaturePk(loCert,loPrivKey)
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."


release loMime
release loCert
release loPrivKey