go - How to use rsa key pair for AES encryption and decryprion in golang

Question

I want to generate RSA key pair(public and private), and then use them for AES encryption and decryption .e.g. Public key for encryption and private key for decryption. I wrote a simple code for this, but the problem is that when I run this code I get this error:

crypto/aes: invalid key size 1639

How can I resolve this problem ?? My encryption code is given below:

//genrating private key
privateKey, err := rsa.GenerateKey(rand.Reader, 2014)
if err != nil {
    return
}
privateKeyDer := x509.MarshalPKCS1PrivateKey(privateKey)
privateKeyBlock := pem.Block{
    Type:    "RSA PRIVATE KEY",
    Headers: nil,
    Bytes:   privateKeyDer,
}
privateKeyPem := string(pem.EncodeToMemory(&privateKeyBlock))

//using privateKeyPem for encryption
text := []byte("My name is Astaxie")
ciphertext, err := encrypt(text, []byte(privateKeyPem))
if err != nil {
    // TODO: Properly handle error
    log.Fatal(err)
}
fmt.Printf("%s => %x
", text, ciphertext)
    
//Definition of encrypt()
func encrypt(plaintext []byte, key []byte) ([]byte, error) {
    c, err := aes.NewCipher(key)
    if err != nil {
        return nil, err
    }

    gcm, err := cipher.NewGCM(c)
    if err != nil {
        return nil, err
    }

    nonce := make([]byte, gcm.NonceSize())
    if _, err = io.ReadFull(rand.Reader, nonce); err != nil {
        return nil, err
    }

    return gcm.Seal(nonce, nonce, plaintext, nil), nil
}

Answer 1

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