Save a Private Key as a PKCS #8 DER File

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Demonstrates the Chilkat PrivateKey.SavePkcs8File method, which saves the key as unencrypted PKCS #8 DER to a file. The only argument is the destination path.

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: The file-writing counterpart to GetPkcs8ENC/GetPkcs8Pem, producing a compact binary .der in the algorithm-independent PKCS #8 container. Because it is unencrypted, the file itself is the only protection for the key — store it with restrictive permissions, or use SavePkcs8EncryptedFile to add a passphrase.

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    success := false

    //  Load a private key to export.
    privKey := chilkat.NewPrivateKey()
    success = privKey.LoadPemFile("qa_data/private.pem")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        privKey.DisposePrivateKey()
        return
    }

    //  Save as unencrypted PKCS #8 DER.
    success = privKey.SavePkcs8File("qa_output/private_pkcs8.der")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        privKey.DisposePrivateKey()
        return
    }

    fmt.Println("Saved.")

    privKey.DisposePrivateKey()