You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: encrypted_key_test.go
    path of file: ./repos/bytom/lib/golang.org/x/crypto/openpgp/packet
    
    the code of the file until where you have to start completion: // Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package packet

import (
	"bytes"
	"crypto/rsa"
	"encoding/hex"
	"fmt"
	"math/big"
	"testing"
)

func bigFromBase10(s string) *big.Int {
	b, ok := new(big.Int).SetString(s, 10)
	if !ok {
		panic("bigFromBase10 failed")
	}
	return b
}

var encryptedKeyPub = rsa.PublicKey{
	E: 65537,
	N: bigFromBase10("115804063926007623305902631768113868327816898845124614648849934718568541074358183759250136204762053879858102352159854352727097033322663029387610959884180306668628526686121021235757016368038585212410610742029286439607686208110250133174279811431933746643015923132833417396844716207301518956640020862630546868823"),
}

var encryptedKeyRSAPriv = &rsa.PrivateKey{
	PublicKey: encryptedKeyPub,
	D
    
func TestEncryptingEncryptedKey(t *testing.T) {
	key := []byte{1, 2, 3, 4}
	const expectedKeyHex = "01020304"
	const keyId = 42

	pub := &PublicKey{
		PublicKey:  &encryptedKeyPub,
		KeyId:      keyId,
		PubKeyAlgo: PubKeyAlgoRSAEncryptOnly,
	}

	buf := new(bytes.Buffer)
	err := SerializeEncryptedKey(buf, pub, CipherAES128, key, nil)
	if err != nil {
		t.Errorf("error writing encrypted key packet: %s", err)
	}

	p, err := Read(buf)
	if err != nil {
		t.Errorf("error from Read: %s", err)
		return
	}
	ek, ok := p.(*EncryptedKey)
	if !ok {
		t.Errorf("didn't parse an EncryptedKey, got %#v", p)
		return
	}

	if ek.KeyId != keyId || ek.Algo != PubKeyAlgoRSAEncryptOnly {
		t.Errorf("unexpected EncryptedKey contents: %#v", ek)
		return
	}

	err = ek.Decrypt(encryptedKeyPriv, nil)
	if err != nil {
		t.Errorf("error from Decrypt: %s", err)
		return
	}

	if ek.CipherFunc != CipherAES128 {
		t.Errorf("unexpected EncryptedKey contents: %#v", ek)
		return
	}

	keyHex := fmt.Sprintf("%x", ek.Key)
	if keyHex != expectedKeyHex {
		t.Errorf("bad key, got %s want %x", keyHex, expectedKeyHex)
	}
}