/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this file,
 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#include <memory>
#include "nss.h"
#include "pk11pub.h"

#include "cpputil.h"
#include "scoped_ptrs.h"

#include "gtest/gtest.h"

namespace nss_test {

// <https://tools.ietf.org/html/rfc7748#section-6.1>
const uint8_t kPkcs8[] = {
    0x30, 0x67, 0x02, 0x01, 0x00, 0x30, 0x14, 0x06, 0x07, 0x2a, 0x86, 0x48,
    0xce, 0x3d, 0x02, 0x01, 0x06, 0x09, 0x2b, 0x06, 0x01, 0x04, 0x01, 0xda,
    0x47, 0x0f, 0x01, 0x04, 0x4c, 0x30, 0x4a, 0x02, 0x01, 0x01, 0x04, 0x20,
    0x77, 0x07, 0x6d, 0x0a, 0x73, 0x18, 0xa5, 0x7d, 0x3c, 0x16, 0xc1, 0x72,
    0x51, 0xb2, 0x66, 0x45, 0xdf, 0x4c, 0x2f, 0x87, 0xeb, 0xc0, 0x99, 0x2a,
    0xb1, 0x77, 0xfb, 0xa5, 0x1d, 0xb9, 0x2c, 0x2a, 0xa1, 0x23, 0x03, 0x21,
    0x00, 0x85, 0x20, 0xf0, 0x09, 0x89, 0x30, 0xa7, 0x54, 0x74, 0x8b, 0x7d,
    0xdc, 0xb4, 0x3e, 0xf7, 0x5a, 0x0d, 0xbf, 0x3a, 0x0d, 0x26, 0x38, 0x1a,
    0xf4, 0xeb, 0xa4, 0xa9, 0x8e, 0xaa, 0x9b, 0x4e, 0x6a};
const uint8_t kSpki[] = {
    0x30, 0x39, 0x30, 0x14, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02,
    0x01, 0x06, 0x09, 0x2b, 0x06, 0x01, 0x04, 0x01, 0xda, 0x47, 0x0f, 0x01,
    0x03, 0x21, 0x00, 0xde, 0x9e, 0xdb, 0x7d, 0x7b, 0x7d, 0xc1, 0xb4, 0xd3,
    0x5b, 0x61, 0xc2, 0xec, 0xe4, 0x35, 0x37, 0x3f, 0x83, 0x43, 0xc8, 0x5b,
    0x78, 0x67, 0x4d, 0xad, 0xfc, 0x7e, 0x14, 0x6f, 0x88, 0x2b, 0x4f};
const uint8_t kSecret[] = {0x4a, 0x5d, 0x9d, 0x5b, 0xa4, 0xce, 0x2d, 0xe1,
                           0x72, 0x8e, 0x3b, 0xf4, 0x80, 0x35, 0x0f, 0x25,
                           0xe0, 0x7e, 0x21, 0xc9, 0x47, 0xd1, 0x9e, 0x33,
                           0x76, 0xf0, 0x9b, 0x3c, 0x1e, 0x16, 0x17, 0x42};

// A public key that's too short (31 bytes).
const uint8_t kSpkiShort[] = {
    0x30, 0x38, 0x30, 0x14, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02,
    0x01, 0x06, 0x09, 0x2b, 0x06, 0x01, 0x04, 0x01, 0xda, 0x47, 0x0f, 0x01,
    0x03, 0x20, 0xde, 0x9e, 0xdb, 0x7d, 0x7b, 0x7d, 0xc1, 0xb4, 0xd3, 0x5b,
    0x61, 0xc2, 0xec, 0xe4, 0x35, 0x37, 0x3f, 0x83, 0x43, 0xc8, 0x5b, 0x78,
    0x67, 0x4d, 0xad, 0xfc, 0x7e, 0x14, 0x6f, 0x88, 0x2b, 0x4f};

// A public key that's too long (33 bytes).
const uint8_t kSpkiLong[] = {
    0x30, 0x3a, 0x30, 0x14, 0x06, 0x07, 0x2a, 0x86, 0x48, 0xce, 0x3d, 0x02,
    0x01, 0x06, 0x09, 0x2b, 0x06, 0x01, 0x04, 0x01, 0xda, 0x47, 0x0f, 0x01,
    0x03, 0x22, 0x00, 0xde, 0x9e, 0xdb, 0x7d, 0x7b, 0x7d, 0xc1, 0xb4, 0xd3,
    0x5b, 0x61, 0xc2, 0xec, 0xe4, 0x35, 0x37, 0x3f, 0x83, 0x43, 0xc8, 0x5b,
    0x78, 0x67, 0x4d, 0xad, 0xfc, 0x7e, 0x14, 0x6f, 0x88, 0x2b, 0x4f, 0x34};

class Pkcs11Curve25519Test : public ::testing::Test {
 protected:
  void Derive(const uint8_t* pkcs8, size_t pkcs8_len, const uint8_t* spki,
              size_t spki_len, const uint8_t* secret, size_t secret_len,
              bool expect_success) {
    ScopedPK11SlotInfo slot(PK11_GetInternalSlot());
    ASSERT_TRUE(slot);

    SECItem pkcs8Item = {siBuffer, toUcharPtr(pkcs8),
                         static_cast<unsigned int>(pkcs8_len)};

    SECKEYPrivateKey* key = nullptr;
    SECStatus rv = PK11_ImportDERPrivateKeyInfoAndReturnKey(
        slot.get(), &pkcs8Item, nullptr, nullptr, false, false, KU_ALL, &key,
        nullptr);
    EXPECT_EQ(SECSuccess, rv);

    ScopedSECKEYPrivateKey privKey(key);
    ASSERT_TRUE(privKey);

    SECItem spkiItem = {siBuffer, toUcharPtr(spki),
                        static_cast<unsigned int>(spki_len)};

    ScopedCERTSubjectPublicKeyInfo certSpki(
        SECKEY_DecodeDERSubjectPublicKeyInfo(&spkiItem));
    ASSERT_TRUE(certSpki);

    ScopedSECKEYPublicKey pubKey(SECKEY_ExtractPublicKey(certSpki.get()));
    ASSERT_TRUE(pubKey);

    ScopedPK11SymKey symKey(PK11_PubDeriveWithKDF(
        privKey.get(), pubKey.get(), false, nullptr, nullptr, CKM_ECDH1_DERIVE,
        CKM_SHA512_HMAC, CKA_DERIVE, 0, CKD_NULL, nullptr, nullptr));
    EXPECT_EQ(expect_success, !!symKey);

    if (expect_success) {
      rv = PK11_ExtractKeyValue(symKey.get());
      EXPECT_EQ(SECSuccess, rv);

      SECItem* keyData = PK11_GetKeyData(symKey.get());
      EXPECT_EQ(secret_len, keyData->len);
      EXPECT_EQ(memcmp(keyData->data, secret, secret_len), 0);
    }
  }
};

TEST_F(Pkcs11Curve25519Test, DeriveSharedSecret) {
  Derive(kPkcs8, sizeof(kPkcs8), kSpki, sizeof(kSpki), kSecret, sizeof(kSecret),
         true);
}

TEST_F(Pkcs11Curve25519Test, DeriveSharedSecretShort) {
  Derive(kPkcs8, sizeof(kPkcs8), kSpkiShort, sizeof(kSpkiShort), nullptr, 0,
         false);
}

TEST_F(Pkcs11Curve25519Test, DeriveSharedSecretLong) {
  Derive(kPkcs8, sizeof(kPkcs8), kSpkiLong, sizeof(kSpkiLong), nullptr, 0,
         false);
}

}  // namespace nss_test