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#include "gtest/gtest.h"
#include "common/ceph_argparse.h"
#include "common/ceph_crypto.h"
#include "common/common_init.h"
#include "global/global_init.h"
#include "global/global_context.h"

class CryptoEnvironment: public ::testing::Environment {
public:
  void SetUp() override {
    ceph::crypto::init(g_ceph_context);
  }
};

TEST(MD5, Simple) {
  ceph::crypto::MD5 h;
  h.Update((const unsigned char*)"foo", 3);
  unsigned char digest[CEPH_CRYPTO_MD5_DIGESTSIZE];
  h.Final(digest);
  int err;
  unsigned char want_digest[CEPH_CRYPTO_MD5_DIGESTSIZE] = {
    0xac, 0xbd, 0x18, 0xdb, 0x4c, 0xc2, 0xf8, 0x5c,
    0xed, 0xef, 0x65, 0x4f, 0xcc, 0xc4, 0xa4, 0xd8,
  };
  err = memcmp(digest, want_digest, CEPH_CRYPTO_MD5_DIGESTSIZE);
  ASSERT_EQ(0, err);
}

TEST(MD5, MultiUpdate) {
  ceph::crypto::MD5 h;
  h.Update((const unsigned char*)"", 0);
  h.Update((const unsigned char*)"fo", 2);
  h.Update((const unsigned char*)"", 0);
  h.Update((const unsigned char*)"o", 1);
  h.Update((const unsigned char*)"", 0);
  unsigned char digest[CEPH_CRYPTO_MD5_DIGESTSIZE];
  h.Final(digest);
  int err;
  unsigned char want_digest[CEPH_CRYPTO_MD5_DIGESTSIZE] = {
    0xac, 0xbd, 0x18, 0xdb, 0x4c, 0xc2, 0xf8, 0x5c,
    0xed, 0xef, 0x65, 0x4f, 0xcc, 0xc4, 0xa4, 0xd8,
  };
  err = memcmp(digest, want_digest, CEPH_CRYPTO_MD5_DIGESTSIZE);
  ASSERT_EQ(0, err);
}

TEST(MD5, Restart) {
  ceph::crypto::MD5 h;
  h.Update((const unsigned char*)"bar", 3);
  h.Restart();
  h.Update((const unsigned char*)"foo", 3);
  unsigned char digest[CEPH_CRYPTO_MD5_DIGESTSIZE];
  h.Final(digest);
  int err;
  unsigned char want_digest[CEPH_CRYPTO_MD5_DIGESTSIZE] = {
    0xac, 0xbd, 0x18, 0xdb, 0x4c, 0xc2, 0xf8, 0x5c,
    0xed, 0xef, 0x65, 0x4f, 0xcc, 0xc4, 0xa4, 0xd8,
  };
  err = memcmp(digest, want_digest, CEPH_CRYPTO_MD5_DIGESTSIZE);
  ASSERT_EQ(0, err);
}

TEST(HMACSHA1, Simple) {
  ceph::crypto::HMACSHA1 h((const unsigned char*)"sekrit", 6);
  h.Update((const unsigned char*)"foo", 3);
  unsigned char digest[CEPH_CRYPTO_HMACSHA1_DIGESTSIZE];
  h.Final(digest);
  int err;
  unsigned char want_digest[CEPH_CRYPTO_HMACSHA1_DIGESTSIZE] = {
    0x04, 0xbc, 0x52, 0x66, 0xb6, 0xff, 0xad, 0xad, 0x9d, 0x57,
    0xce, 0x13, 0xea, 0x8c, 0xf5, 0x6b, 0xf9, 0x95, 0x2f, 0xd6,
  };
  err = memcmp(digest, want_digest, CEPH_CRYPTO_HMACSHA1_DIGESTSIZE);
  ASSERT_EQ(0, err);
}

TEST(HMACSHA1, MultiUpdate) {
  ceph::crypto::HMACSHA1 h((const unsigned char*)"sekrit", 6);
  h.Update((const unsigned char*)"", 0);
  h.Update((const unsigned char*)"fo", 2);
  h.Update((const unsigned char*)"", 0);
  h.Update((const unsigned char*)"o", 1);
  h.Update((const unsigned char*)"", 0);
  unsigned char digest[CEPH_CRYPTO_HMACSHA1_DIGESTSIZE];
  h.Final(digest);
  int err;
  unsigned char want_digest[CEPH_CRYPTO_HMACSHA1_DIGESTSIZE] = {
    0x04, 0xbc, 0x52, 0x66, 0xb6, 0xff, 0xad, 0xad, 0x9d, 0x57,
    0xce, 0x13, 0xea, 0x8c, 0xf5, 0x6b, 0xf9, 0x95, 0x2f, 0xd6,
  };
  err = memcmp(digest, want_digest, CEPH_CRYPTO_HMACSHA1_DIGESTSIZE);
  ASSERT_EQ(0, err);
}

TEST(HMACSHA1, Restart) {
  ceph::crypto::HMACSHA1 h((const unsigned char*)"sekrit", 6);
  h.Update((const unsigned char*)"bar", 3);
  h.Restart();
  h.Update((const unsigned char*)"foo", 3);
  unsigned char digest[CEPH_CRYPTO_HMACSHA1_DIGESTSIZE];
  h.Final(digest);
  int err;
  unsigned char want_digest[CEPH_CRYPTO_HMACSHA1_DIGESTSIZE] = {
    0x04, 0xbc, 0x52, 0x66, 0xb6, 0xff, 0xad, 0xad, 0x9d, 0x57,
    0xce, 0x13, 0xea, 0x8c, 0xf5, 0x6b, 0xf9, 0x95, 0x2f, 0xd6,
  };
  err = memcmp(digest, want_digest, CEPH_CRYPTO_HMACSHA1_DIGESTSIZE);
  ASSERT_EQ(0, err);
}

class ForkDeathTest : public ::testing::Test {
 protected:
  void SetUp() override {
    // shutdown NSS so it can be reinitialized after the fork
    // some data structures used by NSPR are only initialized once, and they
    // will be cleaned up with ceph::crypto::shutdown(false), so we need to
    // keep them around after fork.
    ceph::crypto::shutdown(true);
  }

  void TearDown() override {
    // undo the NSS shutdown we did in the parent process, after the
    // test is done
    ceph::crypto::init(g_ceph_context);
  }
};

void do_simple_crypto() {
  // ensure that the shutdown/fork/init sequence results in a working
  // NSS crypto library; this function is run in the child, after the
  // fork, and if you comment out the ceph::crypto::init, or if the
  // trick were to fail, you would see this ending in an assert and
  // not exit status 0
  ceph::crypto::init(g_ceph_context);
  ceph::crypto::MD5 h;
  h.Update((const unsigned char*)"foo", 3);
  unsigned char digest[CEPH_CRYPTO_MD5_DIGESTSIZE];
  h.Final(digest);
  exit(0);
}

#if GTEST_HAS_DEATH_TEST
TEST_F(ForkDeathTest, MD5) {
  ASSERT_EXIT(do_simple_crypto(), ::testing::ExitedWithCode(0), "^$");
}
#endif //GTEST_HAS_DEATH_TEST

int main(int argc, char **argv) {
  std::vector<const char*> args(argv, argv + argc);
  auto cct = global_init(NULL, args,
                         CEPH_ENTITY_TYPE_CLIENT,
                         CODE_ENVIRONMENT_UTILITY,
                         CINIT_FLAG_NO_DEFAULT_CONFIG_FILE);
  common_init_finish(g_ceph_context);
  ::testing::InitGoogleTest(&argc, argv);
  return RUN_ALL_TESTS();
}