Add a Detached Signature (Separate Key, Header Control)

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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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    success := false

    mime := chilkat.NewMime()
    success = mime.SetBodyFromPlainText("This message will be signed.")
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        return
    }

    //  Load the certificate and its private key separately.
    cert := chilkat.NewCert()
    success = cert.LoadFromFile("qa_data/signer.cer")
    if success == false {
        fmt.Println(cert.LastErrorText())
        mime.DisposeMime()
        cert.DisposeCert()
        return
    }

    privKey := chilkat.NewPrivateKey()
    success = privKey.LoadPemFile("qa_data/signer_privkey.pem")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        mime.DisposeMime()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        return
    }

    //  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.
    transferHeaderFields := true
    success = mime.AddDetachedSignaturePk2(cert,privKey,transferHeaderFields)
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        return
    }

    success = mime.SaveMime("qa_output/signed.eml")
    if success == false {
        fmt.Println(mime.LastErrorText())
        mime.DisposeMime()
        cert.DisposeCert()
        privKey.DisposePrivateKey()
        return
    }

    fmt.Println("Detached signature added (headers transferred).")

    mime.DisposeMime()
    cert.DisposeCert()
    privKey.DisposePrivateKey()