Save a Private Key as a Traditional DER File

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Demonstrates the Chilkat PrivateKey.SavePkcs1File method, which saves the key using the traditional/preferred unencrypted DER representation. 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: This writes the older, algorithm-specific DER structure — useful for compatibility with tools that predate or do not accept PKCS #8. For new work, PKCS #8 (SavePkcs8File) is more interoperable. The output is unencrypted, so protect the file accordingly.

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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 using the traditional/preferred unencrypted DER representation.
    success = privKey.SavePkcs1File("qa_output/private_pkcs1.der")
    if success == false {
        fmt.Println(privKey.LastErrorText())
        privKey.DisposePrivateKey()
        return
    }

    fmt.Println("Saved.")

    privKey.DisposePrivateKey()