RSA Key Export and Import

Question

I'm currently trying to export my created keys and than importing them to use them.

But if I run my code I get the following error:

panic: x509: only RSA and ECDSA public keys supported

goroutine 1 [running]:
main.main()
    /path/to/project/src/main.go:19 +0x3bd

This is my current code:

// Create key
key, _ := rsa.GenerateKey(rand.Reader, 2048)

// Message to encrypt
message := "hi stackoverflow"

priv := x509.MarshalPKCS1PrivateKey(key)
pub, err := x509.MarshalPKIXPublicKey(key.PublicKey)
if err != nil {
    panic(err)
}

private, err := x509.ParsePKCS1PrivateKey(priv)
if err != nil {
    panic(err)
    return
}

public, err := x509.ParsePKIXPublicKey(pub)
if err != nil {
    return
}

encrypted, err := rsa.EncryptPKCS1v15(rand.Reader, public.(*rsa.PublicKey), []byte(message))
if err != nil {
    panic(err)
}
dencrypted, err := rsa.DecryptPKCS1v15(rand.Reader, private, encrypted)
if err != nil {
    panic(err)
}
fmt.Println(string(dencrypted))

(I researched like the hole internet but didn't found something, maybe I used a wrong search term.)

Answer 1

When I run this, I get the panic on MarshalPKIXPublicKey (not ParsePKIXPublicKey as you were suggesting in comment above).

The problem is that the function accepts a *rsa.PublicKey and you're passing a plain rsa.PublicKey.

This works for me: pub, err := x509.MarshalPKIXPublicKey(&key.PublicKey).