/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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 "sechash.h"

#include "gtest/gtest.h"
#include "nss_scoped_ptrs.h"

#include "pk11_signature_test.h"
#include "pk11_rsapss_vectors.h"

namespace nss_test {

class Pkcs11RsaPssTest : public Pk11SignatureTest {
 public:
  Pkcs11RsaPssTest() : Pk11SignatureTest(CKM_RSA_PKCS_PSS, SEC_OID_SHA1) {
    rsaPssParams_.hashAlg = CKM_SHA_1;
    rsaPssParams_.mgf = CKG_MGF1_SHA1;
    rsaPssParams_.sLen = HASH_ResultLenByOidTag(SEC_OID_SHA1);

    params_.type = siBuffer;
    params_.data = reinterpret_cast<unsigned char*>(&rsaPssParams_);
    params_.len = sizeof(rsaPssParams_);
  }

 protected:
  const SECItem* parameters() const { return &params_; }

 private:
  CK_RSA_PKCS_PSS_PARAMS rsaPssParams_;
  SECItem params_;
};

TEST_F(Pkcs11RsaPssTest, GenerateAndSignAndVerify) {
  // Sign data with a 1024-bit RSA key, using PSS/SHA-256.
  SECOidTag hashOid = SEC_OID_SHA256;
  CK_MECHANISM_TYPE hashMech = CKM_SHA256;
  CK_RSA_PKCS_MGF_TYPE mgf = CKG_MGF1_SHA256;
  PK11RSAGenParams rsaGenParams = {1024, 0x10001};

  // Generate RSA key pair.
  ScopedPK11SlotInfo slot(PK11_GetInternalSlot());
  SECKEYPublicKey* pubKeyRaw = nullptr;
  ScopedSECKEYPrivateKey privKey(
      PK11_GenerateKeyPair(slot.get(), CKM_RSA_PKCS_KEY_PAIR_GEN, &rsaGenParams,
                           &pubKeyRaw, false, false, nullptr));
  ASSERT_TRUE(!!privKey && pubKeyRaw);
  ScopedSECKEYPublicKey pubKey(pubKeyRaw);

  // Generate random data to sign.
  uint8_t dataBuf[50];
  SECItem data = {siBuffer, dataBuf, sizeof(dataBuf)};
  unsigned int hLen = HASH_ResultLenByOidTag(hashOid);
  SECStatus rv = PK11_GenerateRandomOnSlot(slot.get(), data.data, data.len);
  EXPECT_EQ(rv, SECSuccess);

  // Allocate memory for the signature.
  std::vector<uint8_t> sigBuf(PK11_SignatureLen(privKey.get()));
  SECItem sig = {siBuffer, &sigBuf[0],
                 static_cast<unsigned int>(sigBuf.size())};

  // Set up PSS parameters.
  CK_RSA_PKCS_PSS_PARAMS rsaPssParams = {hashMech, mgf, hLen};
  SECItem params = {siBuffer, reinterpret_cast<unsigned char*>(&rsaPssParams),
                    sizeof(rsaPssParams)};

  // Sign.
  rv = PK11_SignWithMechanism(privKey.get(), mechanism(), &params, &sig, &data);
  EXPECT_EQ(rv, SECSuccess);

  // Verify.
  rv = PK11_VerifyWithMechanism(pubKey.get(), mechanism(), &params, &sig, &data,
                                nullptr);
  EXPECT_EQ(rv, SECSuccess);

  // Verification with modified data must fail.
  data.data[0] ^= 0xff;
  rv = PK11_VerifyWithMechanism(pubKey.get(), mechanism(), &params, &sig, &data,
                                nullptr);
  EXPECT_EQ(rv, SECFailure);

  // Verification with original data but the wrong signature must fail.
  data.data[0] ^= 0xff;  // Revert previous changes.
  sig.data[0] ^= 0xff;
  rv = PK11_VerifyWithMechanism(pubKey.get(), mechanism(), &params, &sig, &data,
                                nullptr);
  EXPECT_EQ(rv, SECFailure);
}

class Pkcs11RsaPssVectorTest
    : public Pkcs11RsaPssTest,
      public ::testing::WithParamInterface<Pkcs11SignatureTestParams> {};

TEST_P(Pkcs11RsaPssVectorTest, Verify) { Verify(GetParam()); }

TEST_P(Pkcs11RsaPssVectorTest, SignAndVerify) { SignAndVerify(GetParam()); }

#define VECTOR(pkcs8, spki, data, sig)                                \
  {                                                                   \
    DataBuffer(pkcs8, sizeof(pkcs8)), DataBuffer(spki, sizeof(spki)), \
        DataBuffer(data, sizeof(data)), DataBuffer(sig, sizeof(sig))  \
  }
#define VECTOR_N(n)                                                         \
  VECTOR(kTestVector##n##Pkcs8, kTestVector##n##Spki, kTestVector##n##Data, \
         kTestVector##n##Sig)

static const Pkcs11SignatureTestParams kRsaPssVectors[] = {
    // RSA-PSS test vectors, pss-vect.txt, Example 1.1: A 1024-bit RSA Key Pair
    // <ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip>
    VECTOR_N(1),
    // RSA-PSS test vectors, pss-vect.txt, Example 2.1: A 1025-bit RSA Key Pair
    // <ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip>
    VECTOR_N(2),
    // RSA-PSS test vectors, pss-vect.txt, Example 3.1: A 1026-bit RSA Key Pair
    // <ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip>
    VECTOR_N(3),
    // RSA-PSS test vectors, pss-vect.txt, Example 4.1: A 1027-bit RSA Key Pair
    // <ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip>
    VECTOR_N(4),
    // RSA-PSS test vectors, pss-vect.txt, Example 5.1: A 1028-bit RSA Key Pair
    // <ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip>
    VECTOR_N(5),
    // RSA-PSS test vectors, pss-vect.txt, Example 6.1: A 1029-bit RSA Key Pair
    // <ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip>
    VECTOR_N(6),
    // RSA-PSS test vectors, pss-vect.txt, Example 7.1: A 1030-bit RSA Key Pair
    // <ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip>
    VECTOR_N(7),
    // RSA-PSS test vectors, pss-vect.txt, Example 8.1: A 1031-bit RSA Key Pair
    // <ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip>
    VECTOR_N(8),
    // RSA-PSS test vectors, pss-vect.txt, Example 9.1: A 1536-bit RSA Key Pair
    // <ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip>
    VECTOR_N(9),
    // RSA-PSS test vectors, pss-vect.txt, Example 10.1: A 2048-bit RSA Key Pair
    // <ftp://ftp.rsasecurity.com/pub/pkcs/pkcs-1/pkcs-1v2-1-vec.zip>
    VECTOR_N(10)};

INSTANTIATE_TEST_CASE_P(RsaPssSignVerify, Pkcs11RsaPssVectorTest,
                        ::testing::ValuesIn(kRsaPssVectors));

}  // namespace nss_test