(Go) Convert RSA Private Key to Public Key

Demonstrates how to get a public RSA key from a private RSA key.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

    key := chilkat.NewPrivateKey()

    // Step 1: Load the private key from a source.
    // (Chilkat can load private keys from all types of formats, and from in-memory bytes or encoded strings.
    // see the online reference documentation for more options.)
    success := key.LoadPemFile("qa_data/pem/VP_Private.pem")
    if success != true {
        fmt.Println(key.LastErrorText())
        key.DisposePrivateKey()
        return
    }

    // Step 2: Get the public key object from the private key object.
    pubKey := key.GetPublicKey()
    if key.LastMethodSuccess() != true {
        fmt.Println(key.LastErrorText())
        key.DisposePrivateKey()
        return
    }

    // Step 3: Save the public key in a desired format. 
    // (Chilkat can load or save public and private keys in many different formats.  See
    // the online reference documentation for more options.)

    // Saves to a PKCS8 PEM file.
    bPreferPkcs1 := false
    success = pubKey.SavePemFile(bPreferPkcs1,"qa_data/pem/VP_Public.pem")
    if pubKey.LastMethodSuccess() != true {
        fmt.Println(pubKey.LastErrorText())
        key.DisposePrivateKey()
        return
    }

    pubKey.DisposePublicKey()

    fmt.Println("Extracted and saved public key from private key.")

    key.DisposePrivateKey()