// 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 (
	"big"
	"crypto/rsa"
	"fmt"
	"testing"
)

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

func TestEncryptedKey(t *testing.T) {
	p, err := Read(readerFromHex(encryptedKeyHex))
	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 != 0x2a67d68660df41c7 || ek.Algo != PubKeyAlgoRSA {
		t.Errorf("unexpected EncryptedKey contents: %#v", ek)
		return
	}

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

	priv := &rsa.PrivateKey{
		PublicKey: pub,
		D:         bigFromBase10("32355588668219869544751561565313228297765464314098552250409557267371233892496951383426602439009993875125222579159850054973310859166139474359774543943714622292329487391199285040721944491839695981199720170366763547754915493640685849961780092241140181198779299712578774460837139360803883139311171713302987058393"),
	}

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

	if ek.CipherFunc != CipherAES256 {
		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)
	}
}

const encryptedKeyHex = "c18c032a67d68660df41c70104005789d0de26b6a50c985a02a13131ca829c413a35d0e6fa8d6842599252162808ac7439c72151c8c6183e76923fe3299301414d0c25a2f06a2257db3839e7df0ec964773f6e4c4ac7ff3b48c444237166dd46ba8ff443a5410dc670cb486672fdbe7c9dfafb75b4fea83af3a204fe2a7dfa86bd20122b4f3d2646cbeecb8f7be8"
const expectedKeyHex = "d930363f7e0308c333b9618617ea728963d8df993665ae7be1092d4926fd864b"