/*
* (C) 2009,2010,2014,2015,2017,2018 Jack Lloyd
* (C) 2015 Simon Warta (Kullo GmbH)
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include "cli.h"
#include "../tests/test_rng.h" // FIXME

#include <sstream>
#include <iomanip>
#include <chrono>
#include <functional>
#include <algorithm>
#include <map>
#include <set>

// Always available:
#include <botan/entropy_src.h>
#include <botan/parsing.h>
#include <botan/cpuid.h>
#include <botan/internal/os_utils.h>
#include <botan/version.h>

#if defined(BOTAN_HAS_BLOCK_CIPHER)
   #include <botan/block_cipher.h>
#endif

#if defined(BOTAN_HAS_STREAM_CIPHER)
   #include <botan/stream_cipher.h>
#endif

#if defined(BOTAN_HAS_HASH)
   #include <botan/hash.h>
#endif

#if defined(BOTAN_HAS_CIPHER_MODES)
   #include <botan/cipher_mode.h>
#endif

#if defined(BOTAN_HAS_MAC)
   #include <botan/mac.h>
#endif

#if defined(BOTAN_HAS_AUTO_SEEDING_RNG)
   #include <botan/auto_rng.h>
#endif

#if defined(BOTAN_HAS_SYSTEM_RNG)
   #include <botan/system_rng.h>
#endif

#if defined(BOTAN_HAS_HMAC_DRBG)
   #include <botan/hmac_drbg.h>
#endif

#if defined(BOTAN_HAS_RDRAND_RNG)
   #include <botan/rdrand_rng.h>
#endif

#if defined(BOTAN_HAS_CHACHA_RNG)
   #include <botan/chacha_rng.h>
#endif

#if defined(BOTAN_HAS_FPE_FE1)
   #include <botan/fpe_fe1.h>
#endif

#if defined(BOTAN_HAS_RFC3394_KEYWRAP)
   #include <botan/rfc3394.h>
#endif

#if defined(BOTAN_HAS_COMPRESSION)
   #include <botan/compression.h>
#endif

#if defined(BOTAN_HAS_PUBLIC_KEY_CRYPTO)
   #include <botan/pkcs8.h>
   #include <botan/pubkey.h>
   #include <botan/pk_algs.h>
   #include <botan/x509_key.h>
   #include <botan/workfactor.h>
#endif

#if defined(BOTAN_HAS_NUMBERTHEORY)
   #include <botan/numthry.h>
   #include <botan/pow_mod.h>
   #include <botan/reducer.h>
#endif

#if defined(BOTAN_HAS_ECC_GROUP)
   #include <botan/ec_group.h>
#endif

#if defined(BOTAN_HAS_DL_GROUP)
   #include <botan/dl_group.h>
#endif

#if defined(BOTAN_HAS_MCELIECE)
   #include <botan/mceliece.h>
#endif

#if defined(BOTAN_HAS_NEWHOPE)
   #include <botan/newhope.h>
#endif

namespace Botan_CLI {

namespace {

class Timer final
   {
   public:
      Timer(const std::string& name,
            const std::string& provider,
            const std::string& doing,
            uint64_t event_mult,
            size_t buf_size,
            double clock_cycle_ratio,
            uint64_t clock_speed)
         : m_name(name + ((provider.empty() || provider == "base") ? "" : " [" + provider + "]"))
         , m_doing(doing)
         , m_buf_size(buf_size)
         , m_event_mult(event_mult)
         , m_clock_cycle_ratio(clock_cycle_ratio)
         , m_clock_speed(clock_speed)
         {}

      Timer(const Timer& other) = default;

      static uint64_t get_system_timestamp_ns()
         {
         return Botan::OS::get_system_timestamp_ns();
         }

      static uint64_t get_cpu_cycle_counter()
         {
         return Botan::OS::get_processor_timestamp();
         }

      void start()
         {
         stop();
         m_timer_start = Timer::get_system_timestamp_ns();
         m_cpu_cycles_start = Timer::get_cpu_cycle_counter();
         }

      void stop();

      bool under(std::chrono::milliseconds msec)
         {
         return (milliseconds() < msec.count());
         }

      class Timer_Scope final
         {
         public:
            explicit Timer_Scope(Timer& timer)
               : m_timer(timer)
               {
               m_timer.start();
               }
            ~Timer_Scope()
               {
               m_timer.stop();
               }
         private:
            Timer& m_timer;
         };

      template<typename F>
      auto run(F f) -> decltype(f())
         {
         Timer_Scope timer(*this);
         return f();
         }

      template<typename F>
      void run_until_elapsed(std::chrono::milliseconds msec, F f)
         {
         while(this->under(msec))
            {
            run(f);
            }
         }

      uint64_t value() const
         {
         return m_time_used;
         }

      double seconds() const
         {
         return milliseconds() / 1000.0;
         }

      double milliseconds() const
         {
         return value() / 1000000.0;
         }

      double ms_per_event() const
         {
         return milliseconds() / events();
         }

      uint64_t cycles_consumed() const
         {
         if(m_clock_speed != 0)
            {
            return (static_cast<double>(m_clock_speed) * value()) / 1000;
            }
         return m_cpu_cycles_used;
         }

      uint64_t events() const
         {
         return m_event_count * m_event_mult;
         }

      const std::string& get_name() const
         {
         return m_name;
         }

      const std::string& doing() const
         {
         return m_doing;
         }

      size_t buf_size() const
         {
         return m_buf_size;
         }

      double bytes_per_second() const
         {
         return seconds() > 0.0 ? events() / seconds() : 0.0;
         }

      double events_per_second() const
         {
         return seconds() > 0.0 ? events() / seconds() : 0.0;
         }

      double seconds_per_event() const
         {
         return events() > 0 ? seconds() / events() : 0.0;
         }

      void set_custom_msg(const std::string& s)
         {
         m_custom_msg = s;
         }

      bool operator<(const Timer& other) const
         {
         if(this->doing() != other.doing())
            return (this->doing() < other.doing());

         return (this->get_name() < other.get_name());
         }

      std::string to_string() const
         {
         if(m_custom_msg.size() > 0)
            {
            return m_custom_msg;
            }
         else if(this->buf_size() == 0)
            {
            return result_string_ops();
            }
         else
            {
            return result_string_bps();
            }
         }

   private:
      std::string result_string_bps() const;
      std::string result_string_ops() const;

      // const data
      std::string m_name, m_doing;
      size_t m_buf_size;
      uint64_t m_event_mult;
      double m_clock_cycle_ratio;
      uint64_t m_clock_speed;

      // set at runtime
      std::string m_custom_msg;
      uint64_t m_time_used = 0, m_timer_start = 0;
      uint64_t m_event_count = 0;

      uint64_t m_max_time = 0, m_min_time = 0;
      uint64_t m_cpu_cycles_start = 0, m_cpu_cycles_used = 0;
   };

void Timer::stop()
   {
   if(m_timer_start)
      {
      const uint64_t now = Timer::get_system_timestamp_ns();

      if(now > m_timer_start)
         {
         uint64_t dur = now - m_timer_start;

         m_time_used += dur;

         if(m_cpu_cycles_start != 0)
            {
            uint64_t cycles_taken = Timer::get_cpu_cycle_counter() - m_cpu_cycles_start;
            if(cycles_taken > 0)
               {
               m_cpu_cycles_used += static_cast<size_t>(cycles_taken * m_clock_cycle_ratio);
               }
            }

         if(m_event_count == 0)
            {
            m_min_time = m_max_time = dur;
            }
         else
            {
            m_max_time = std::max(m_max_time, dur);
            m_min_time = std::min(m_min_time, dur);
            }
         }

      m_timer_start = 0;
      ++m_event_count;
      }
   }

std::string Timer::result_string_bps() const
   {
   const size_t MiB = 1024 * 1024;

   const double MiB_total = static_cast<double>(events()) / MiB;
   const double MiB_per_sec = MiB_total / seconds();

   std::ostringstream oss;
   oss << get_name();

   if(!doing().empty())
      {
      oss << " " << doing();
      }

   if(buf_size() > 0)
      {
      oss << " buffer size " << buf_size() << " bytes:";
      }

   if(events() == 0)
      oss << " " << "N/A";
   else
      oss << " " << std::fixed << std::setprecision(3) << MiB_per_sec << " MiB/sec";

   if(cycles_consumed() != 0)
      {
      const double cycles_per_byte = static_cast<double>(cycles_consumed()) / events();
      oss << " " << std::fixed << std::setprecision(2) << cycles_per_byte << " cycles/byte";
      }

   oss << " (" << MiB_total << " MiB in " << milliseconds() << " ms)\n";

   return oss.str();
   }

std::string Timer::result_string_ops() const
   {
   std::ostringstream oss;

   oss << get_name() << " ";

   if(events() == 0)
      {
      oss << "no events\n";
      }
   else
      {
      oss << static_cast<uint64_t>(events_per_second())
          << ' ' << doing() << "/sec; "
          << std::setprecision(2) << std::fixed
          << ms_per_event() << " ms/op";

      if(cycles_consumed() != 0)
         {
         const double cycles_per_op = static_cast<double>(cycles_consumed()) / events();
         const size_t precision = (cycles_per_op < 10000) ? 2 : 0;
         oss << " " << std::fixed << std::setprecision(precision) << cycles_per_op << " cycles/op";
         }

      oss << " (" << events() << " " << (events() == 1 ? "op" : "ops")
          << " in " << milliseconds() << " ms)\n";
      }

   return oss.str();
   }

class JSON_Output final
   {
   public:
      void add(const Timer& timer) { m_results.push_back(timer); }

      std::string print() const
         {
         std::ostringstream out;

         out << "[\n";

         for(size_t i = 0; i != m_results.size(); ++i)
            {
            if(i != 0)
               out << ",";

            const Timer& t = m_results[i];

            out << '{';
            out << "\"algo\": \"" << t.get_name() << "\", ";
            out << "\"op\": \"" << t.doing() << "\", ";

            out << "\"events\": " << t.events() << ", ";
            if(t.cycles_consumed() > 0)
               out << "\"cycles\": " << t.cycles_consumed() << ", ";
            if(t.buf_size() > 0)
               {
               out << "\"bps\": " << static_cast<uint64_t>(t.events() / (t.value() / 1000000000.0)) << ", ";
               out << "\"buf_size\": " << t.buf_size() << ", ";
               }

            out << "\"nanos\": " << t.value();

            out << "}\n";
            }
         out << "]\n";

         return out.str();
         }
   private:
      std::vector<Timer> m_results;
   };

class Summary final
   {
   public:
      Summary() {}

      void add(const Timer& t)
         {
         if(t.buf_size() == 0)
            {
            m_ops_entries.push_back(t);
            }
         else
            {
            m_bps_entries[std::make_pair(t.doing(), t.get_name())].push_back(t);
            }
         }

      std::string print()
         {
         const size_t name_padding = 35;
         const size_t op_name_padding = 16;
         const size_t op_padding = 16;

         std::ostringstream result_ss;
         result_ss << std::fixed;

         if(m_bps_entries.size() > 0)
            {
            result_ss << "\n";

            // add table header
            result_ss << std::setw(name_padding) << std::left << "algo"
                      << std::setw(op_name_padding) << std::left << "operation";

            for(const Timer& t : m_bps_entries.begin()->second)
               {
               result_ss << std::setw(op_padding) << std::right << (std::to_string(t.buf_size()) + " bytes");
               }
            result_ss << "\n";

            // add table entries
            for(const auto& entry : m_bps_entries)
               {
               if(entry.second.empty())
                  continue;

               result_ss << std::setw(name_padding) << std::left << (entry.first.second)
                         << std::setw(op_name_padding) << std::left << (entry.first.first);

               for(const Timer& t : entry.second)
                  {

                  if(t.events() == 0)
                     {
                     result_ss << std::setw(op_padding) << std::right << "N/A";
                     }
                  else
                     {
                     result_ss << std::setw(op_padding) << std::right
                               << std::setprecision(2) << (t.bytes_per_second() / 1000.0);
                     }
                  }

               result_ss << "\n";
               }

            result_ss << "\n[results are the number of 1000s bytes processed per second]\n";
            }

         if(m_ops_entries.size() > 0)
            {
            result_ss << std::setprecision(6) << "\n";

            // sort entries
            std::sort(m_ops_entries.begin(), m_ops_entries.end());

            // add table header
            result_ss << std::setw(name_padding) << std::left << "algo"
                      << std::setw(op_name_padding) << std::left << "operation"
                      << std::setw(op_padding) << std::right << "sec/op"
                      << std::setw(op_padding) << std::right << "op/sec"
                      << "\n";

            // add table entries
            for(const Timer& entry : m_ops_entries)
               {
               result_ss << std::setw(name_padding) << std::left << entry.get_name()
                         << std::setw(op_name_padding) << std::left << entry.doing()
                         << std::setw(op_padding) << std::right << entry.seconds_per_event()
                         << std::setw(op_padding) << std::right << entry.events_per_second()
                         << "\n";
               }
            }

         return result_ss.str();
         }

   private:
      std::map<std::pair<std::string, std::string>, std::vector<Timer>> m_bps_entries;
      std::vector<Timer> m_ops_entries;
   };

std::vector<size_t> unique_buffer_sizes(const std::string& cmdline_arg)
   {
   std::set<size_t> buf;
   for(std::string size_str : Botan::split_on(cmdline_arg, ','))
      {
      size_t x = 0;
      try
         {
         size_t converted = 0;
         x = static_cast<size_t>(std::stoul(size_str, &converted, 0));

         if(converted != size_str.size())
            throw CLI_Usage_Error("Invalid integer");
         }
      catch(std::exception& e)
         {
         throw CLI_Usage_Error("Invalid integer value '" + size_str + "' for option buf-size");
         }

      if(x == 0 || x > 16*1024*1024)
         throw CLI_Usage_Error("Invalid integer value '" + size_str + "' for option buf-size");

      buf.insert(x);
      }

   return std::vector<size_t>(buf.begin(), buf.end());
   }

}

class Speed final : public Command
   {
   public:
      Speed()
         : Command("speed --msec=500 --format=default --ecc-groups= --provider= --buf-size=1024 --clear-cpuid= --cpu-clock-speed=0 --cpu-clock-ratio=1.0 *algos") {}

      std::vector<std::string> default_benchmark_list()
         {
         /*
         This is not intended to be exhaustive: it just hits the high
         points of the most interesting or widely used algorithms.
         */

         return {
            /* Block ciphers */
            "AES-128",
            "AES-192",
            "AES-256",
            "ARIA-128",
            "ARIA-192",
            "ARIA-256",
            "Blowfish",
            "CAST-128",
            "CAST-256",
            "Camellia-128",
            "Camellia-192",
            "Camellia-256",
            "DES",
            "TripleDES",
            "GOST-28147-89",
            "IDEA",
            "KASUMI",
            "MISTY1",
            "Noekeon",
            "SHACAL2",
            "SM4",
            "Serpent",
            "Threefish-512",
            "Twofish",
            "XTEA",

            /* Cipher modes */
            "AES-128/CBC",
            "AES-128/CTR-BE",
            "AES-128/EAX",
            "AES-128/OCB",
            "AES-128/GCM",
            "AES-128/XTS",

            "Serpent/CBC",
            "Serpent/CTR-BE",
            "Serpent/EAX",
            "Serpent/OCB",
            "Serpent/GCM",
            "Serpent/XTS",

            "ChaCha20Poly1305",

            /* Stream ciphers */
            "RC4",
            "Salsa20",

            /* Hashes */
            "Tiger",
            "RIPEMD-160",
            "SHA-160",
            "SHA-256",
            "SHA-512",
            "Skein-512",
            "Keccak-1600(512)",
            "Whirlpool",

            /* MACs */
            "CMAC(AES-128)",
            "HMAC(SHA-256)",

            /* Misc */
            "random_prime"

            /* pubkey */
            "RSA",
            "DH",
            "ECDH",
            "ECDSA",
            "ECKCDSA",
            "ECGDSA",
            "Ed25519",
            "Curve25519",
            "NEWHOPE",
            "McEliece",
            };
         }

      std::string group() const override
         {
         return "misc";
         }

      std::string description() const override
         {
         return "Measures the speed of algorithms";
         }

      void go() override
         {
         std::chrono::milliseconds msec(get_arg_sz("msec"));
         const std::string provider = get_arg("provider");
         std::vector<std::string> ecc_groups = Botan::split_on(get_arg("ecc-groups"), ',');
         const std::string format = get_arg("format");
         const std::string clock_ratio = get_arg("cpu-clock-ratio");
         m_clock_speed = get_arg_sz("cpu-clock-speed");

         m_clock_cycle_ratio = std::strtod(clock_ratio.c_str(), nullptr);

         /*
         * This argument is intended to be the ratio between the cycle counter
         * and the actual machine cycles. It is extremely unlikely that there is
         * any machine where the cycle counter increments faster than the actual
         * clock.
         */
         if(m_clock_cycle_ratio < 0.0 || m_clock_cycle_ratio > 1.0)
            throw CLI_Usage_Error("Unlikely CPU clock ratio of " + clock_ratio);

         m_clock_cycle_ratio = 1.0 / m_clock_cycle_ratio;

         if(m_clock_speed != 0 && Botan::OS::get_processor_timestamp() != 0)
            {
            error_output() << "The --cpu-clock-speed option is only intended to be used on "
                              "platforms without access to a cycle counter.\n"
                              "Expected incorrect results\n\n";;
            }

         if(format == "table")
            m_summary.reset(new Summary);
         else if(format == "json")
            m_json.reset(new JSON_Output);
         else if(format != "default")
            throw CLI_Usage_Error("Unknown --format type '" + format + "'");

         if(ecc_groups.empty())
            ecc_groups = { "secp256r1", "brainpool256r1",
                           "secp384r1", "brainpool384r1",
                           "secp521r1", "brainpool512r1" };

         std::vector<std::string> algos = get_arg_list("algos");

         const std::vector<size_t> buf_sizes = unique_buffer_sizes(get_arg("buf-size"));

         Botan::CPUID::initialize();

         for(std::string cpuid_to_clear : Botan::split_on(get_arg("clear-cpuid"), ','))
            {
            for(auto bit : Botan::CPUID::bit_from_string(cpuid_to_clear))
               {
               Botan::CPUID::clear_cpuid_bit(bit);
               }
            }

         if(verbose() || m_summary)
            {
            output() << Botan::version_string() << "\n"
                     << "CPUID: " << Botan::CPUID::to_string() << "\n\n";
            }

         const bool using_defaults = (algos.empty());
         if(using_defaults)
            {
            algos = default_benchmark_list();
            }

         for(auto algo : algos)
            {
            using namespace std::placeholders;

            if(false)
               {
               }
#if defined(BOTAN_HAS_HASH)
            else if(Botan::HashFunction::providers(algo).size() > 0)
               {
               bench_providers_of<Botan::HashFunction>(
                  algo, provider, msec, buf_sizes,
                  std::bind(&Speed::bench_hash, this, _1, _2, _3, _4));
               }
#endif
#if defined(BOTAN_HAS_BLOCK_CIPHER)
            else if(Botan::BlockCipher::providers(algo).size() > 0)
               {
               bench_providers_of<Botan::BlockCipher>(
                  algo, provider, msec, buf_sizes,
                  std::bind(&Speed::bench_block_cipher, this, _1, _2, _3, _4));
               }
#endif
#if defined(BOTAN_HAS_STREAM_CIPHER)
            else if(Botan::StreamCipher::providers(algo).size() > 0)
               {
               bench_providers_of<Botan::StreamCipher>(
                  algo, provider, msec, buf_sizes,
                  std::bind(&Speed::bench_stream_cipher, this, _1, _2, _3, _4));
               }
#endif
#if defined(BOTAN_HAS_CIPHER_MODES)
            else if(auto enc = Botan::get_cipher_mode(algo, Botan::ENCRYPTION))
               {
               auto dec = Botan::get_cipher_mode(algo, Botan::DECRYPTION);
               bench_cipher_mode(*enc, *dec, msec, buf_sizes);
               }
#endif
#if defined(BOTAN_HAS_MAC)
            else if(Botan::MessageAuthenticationCode::providers(algo).size() > 0)
               {
               bench_providers_of<Botan::MessageAuthenticationCode>(
                  algo, provider, msec, buf_sizes,
                  std::bind(&Speed::bench_mac, this, _1, _2, _3, _4));
               }
#endif
#if defined(BOTAN_HAS_RSA)
            else if(algo == "RSA")
               {
               bench_rsa(provider, msec);
               }
#endif
#if defined(BOTAN_HAS_ECDSA)
            else if(algo == "ECDSA")
               {
               bench_ecdsa(ecc_groups, provider, msec);
               }
#endif
#if defined(BOTAN_HAS_SM2)
            else if(algo == "SM2")
               {
               bench_sm2(ecc_groups, provider, msec);
               }
#endif
#if defined(BOTAN_HAS_ECKCDSA)
            else if(algo == "ECKCDSA")
               {
               bench_eckcdsa(ecc_groups, provider, msec);
               }
#endif
#if defined(BOTAN_HAS_GOST_34_10_2001)
            else if(algo == "GOST-34.10")
               {
               bench_gost_3410(provider, msec);
               }
#endif
#if defined(BOTAN_HAS_ECGDSA)
            else if(algo == "ECGDSA")
               {
               bench_ecgdsa(ecc_groups, provider, msec);
               }
#endif
#if defined(BOTAN_HAS_ED25519)
            else if(algo == "Ed25519")
               {
               bench_ed25519(provider, msec);
               }
#endif
#if defined(BOTAN_HAS_DIFFIE_HELLMAN)
            else if(algo == "DH")
               {
               bench_dh(provider, msec);
               }
#endif
#if defined(BOTAN_HAS_DSA)
            else if(algo == "DSA")
               {
               bench_dsa(provider, msec);
               }
#endif
#if defined(BOTAN_HAS_ELGAMAL)
            else if(algo == "ElGamal")
               {
               bench_elgamal(provider, msec);
               }
#endif
#if defined(BOTAN_HAS_ECDH)
            else if(algo == "ECDH")
               {
               bench_ecdh(ecc_groups, provider, msec);
               }
#endif
#if defined(BOTAN_HAS_CURVE_25519)
            else if(algo == "Curve25519")
               {
               bench_curve25519(provider, msec);
               }
#endif
#if defined(BOTAN_HAS_MCELIECE)
            else if(algo == "McEliece")
               {
               bench_mceliece(provider, msec);
               }
#endif
#if defined(BOTAN_HAS_XMSS)
            else if(algo == "XMSS")
               {
               bench_xmss(provider, msec);
               }
#endif
#if defined(BOTAN_HAS_NEWHOPE) && defined(BOTAN_HAS_CHACHA_RNG)
            else if(algo == "NEWHOPE")
               {
               bench_newhope(provider, msec);
               }
#endif

#if defined(BOTAN_HAS_DL_GROUP)
            else if(algo == "modexp")
               {
               bench_modexp(msec);
               }
#endif

#if defined(BOTAN_HAS_NUMBERTHEORY)
            else if(algo == "random_prime")
               {
               bench_random_prime(msec);
               }
            else if(algo == "inverse_mod")
               {
               bench_inverse_mod(msec);
               }
            else if(algo == "bn_redc")
               {
               bench_bn_redc(msec);
               }
#endif

#if defined(BOTAN_HAS_FPE_FE1)
            else if(algo == "fpe_fe1")
               {
               bench_fpe_fe1(msec);
               }
#endif

#if defined(BOTAN_HAS_RFC3394_KEYWRAP)
            else if(algo == "rfc3394")
               {
               bench_rfc3394(msec);
               }
#endif

#if defined(BOTAN_HAS_ECC_GROUP)
            else if(algo == "ecc_mult")
               {
               bench_ecc_mult(ecc_groups, msec);
               }
            else if(algo == "os2ecp")
               {
               bench_os2ecp(ecc_groups, msec);
               }
#endif
            else if(algo == "RNG")
               {
#if defined(BOTAN_HAS_AUTO_SEEDING_RNG)
               Botan::AutoSeeded_RNG auto_rng;
               bench_rng(auto_rng, "AutoSeeded_RNG (with reseed)", msec, buf_sizes);
#endif

#if defined(BOTAN_HAS_SYSTEM_RNG)
               bench_rng(Botan::system_rng(), "System_RNG", msec, buf_sizes);
#endif

#if defined(BOTAN_HAS_RDRAND_RNG)
               if(Botan::CPUID::has_rdrand())
                  {
                  Botan::RDRAND_RNG rdrand;
                  bench_rng(rdrand, "RDRAND", msec, buf_sizes);
                  }
#endif

#if defined(BOTAN_HAS_HMAC_DRBG)
               for(std::string hash : { "SHA-256", "SHA-384", "SHA-512" })
                  {
                  Botan::HMAC_DRBG hmac_drbg(hash);
                  bench_rng(hmac_drbg, hmac_drbg.name(), msec, buf_sizes);
                  }
#endif

#if defined(BOTAN_HAS_CHACHA_RNG)
               // Provide a dummy seed
               Botan::ChaCha_RNG chacha_rng(Botan::secure_vector<uint8_t>(32));
               bench_rng(chacha_rng, "ChaCha_RNG", msec, buf_sizes);
#endif

               }
            else if(algo == "entropy")
               {
               bench_entropy_sources(msec);
               }
            else
               {
               if(verbose() || !using_defaults)
                  {
                  error_output() << "Unknown algorithm '" << algo << "'\n";
                  }
               }
            }

         if(m_json)
            {
            output() << m_json->print();
            }
         if(m_summary)
            {
            output() << m_summary->print() << "\n";
            }

         if(verbose() && m_clock_speed == 0 && m_cycles_consumed > 0 && m_ns_taken > 0)
            {
            const double seconds = static_cast<double>(m_ns_taken) / 1000000000;
            const double Hz = static_cast<double>(m_cycles_consumed) / seconds;
            const double MHz = Hz / 1000000;
            output() << "\nEstimated clock speed " << MHz << " MHz\n";
            }
         }

   private:

      size_t m_clock_speed = 0;
      double m_clock_cycle_ratio = 0.0;
      uint64_t m_cycles_consumed = 0;
      uint64_t m_ns_taken = 0;
      std::unique_ptr<Summary> m_summary;
      std::unique_ptr<JSON_Output> m_json;

      void record_result(const std::unique_ptr<Timer>& t)
         {
         m_ns_taken += t->value();
         m_cycles_consumed += t->cycles_consumed();
         if(m_json)
            {
            m_json->add(*t);
            }
         else
            {
            output() << t->to_string() << std::flush;
            if(m_summary)
               m_summary->add(*t);
            }
         }

      template<typename T>
      using bench_fn = std::function<void (T&,
                                           std::string,
                                           std::chrono::milliseconds,
                                           const std::vector<size_t>&)>;

      template<typename T>
      void bench_providers_of(const std::string& algo,
                              const std::string& provider, /* user request, if any */
                              const std::chrono::milliseconds runtime,
                              const std::vector<size_t>& buf_sizes,
                              bench_fn<T> bench_one)
         {
         for(auto const& prov : T::providers(algo))
            {
            if(provider.empty() || provider == prov)
               {
               auto p = T::create(algo, prov);

               if(p)
                  {
                  bench_one(*p, prov, runtime, buf_sizes);
                  }
               }
            }
         }

      std::unique_ptr<Timer> make_timer(const std::string& name,
                                        uint64_t event_mult = 1,
                                        const std::string& what = "",
                                        const std::string& provider = "",
                                        size_t buf_size = 0)
         {
         return std::unique_ptr<Timer>(
            new Timer(name, provider, what, event_mult, buf_size,
                      m_clock_cycle_ratio, m_clock_speed));
         }

      std::unique_ptr<Timer> make_timer(const std::string& algo,
                                        const std::string& provider,
                                        const std::string& what)
         {
         return make_timer(algo, 1, what, provider, 0);
         }

#if defined(BOTAN_HAS_BLOCK_CIPHER)
      void bench_block_cipher(Botan::BlockCipher& cipher,
                              const std::string& provider,
                              std::chrono::milliseconds runtime,
                              const std::vector<size_t>& buf_sizes)
         {
         std::unique_ptr<Timer> ks_timer = make_timer(cipher.name(), provider, "key schedule");

         const Botan::SymmetricKey key(rng(), cipher.maximum_keylength());
         ks_timer->run([&]() { cipher.set_key(key); });

         const size_t bs = cipher.block_size();
         std::set<size_t> buf_sizes_in_blocks;
         for(size_t buf_size : buf_sizes)
            {
            if(buf_size % bs == 0)
               buf_sizes_in_blocks.insert(buf_size);
            else
               buf_sizes_in_blocks.insert(buf_size + bs - (buf_size % bs));
            }

         for(size_t buf_size : buf_sizes_in_blocks)
            {
            std::vector<uint8_t> buffer(buf_size);

            std::unique_ptr<Timer> encrypt_timer = make_timer(cipher.name(), buffer.size(), "encrypt", provider, buf_size);
            std::unique_ptr<Timer> decrypt_timer = make_timer(cipher.name(), buffer.size(), "decrypt", provider, buf_size);

            encrypt_timer->run_until_elapsed(runtime, [&]() { cipher.encrypt(buffer); });
            record_result(encrypt_timer);

            decrypt_timer->run_until_elapsed(runtime, [&]() { cipher.decrypt(buffer); });
            record_result(decrypt_timer);
            }
         }
#endif

#if defined(BOTAN_HAS_STREAM_CIPHER)
      void bench_stream_cipher(
         Botan::StreamCipher& cipher,
         const std::string& provider,
         const std::chrono::milliseconds runtime,
         const std::vector<size_t>& buf_sizes)
         {
         for(auto buf_size : buf_sizes)
            {
            Botan::secure_vector<uint8_t> buffer = rng().random_vec(buf_size);

            std::unique_ptr<Timer> encrypt_timer = make_timer(cipher.name(), buffer.size(), "encrypt", provider, buf_size);

            const Botan::SymmetricKey key(rng(), cipher.maximum_keylength());
            cipher.set_key(key);

            if(cipher.valid_iv_length(12))
               {
               const Botan::InitializationVector iv(rng(), 12);
               cipher.set_iv(iv.begin(), iv.size());
               }

            while(encrypt_timer->under(runtime))
               {
               encrypt_timer->run([&]() { cipher.encipher(buffer); });
               }

            record_result(encrypt_timer);
            }
         }
#endif

#if defined(BOTAN_HAS_HASH)
      void bench_hash(
         Botan::HashFunction& hash,
         const std::string& provider,
         const std::chrono::milliseconds runtime,
         const std::vector<size_t>& buf_sizes)
         {
         std::vector<uint8_t> output(hash.output_length());

         for(auto buf_size : buf_sizes)
            {
            Botan::secure_vector<uint8_t> buffer = rng().random_vec(buf_size);

            std::unique_ptr<Timer> timer = make_timer(hash.name(), buffer.size(), "hash", provider, buf_size);
            timer->run_until_elapsed(runtime, [&]() { hash.update(buffer); hash.final(output.data()); });
            record_result(timer);
            }
         }
#endif

#if defined(BOTAN_HAS_MAC)
      void bench_mac(
         Botan::MessageAuthenticationCode& mac,
         const std::string& provider,
         const std::chrono::milliseconds runtime,
         const std::vector<size_t>& buf_sizes)
         {
         std::vector<uint8_t> output(mac.output_length());

         for(auto buf_size : buf_sizes)
            {
            Botan::secure_vector<uint8_t> buffer = rng().random_vec(buf_size);

            const Botan::SymmetricKey key(rng(), mac.maximum_keylength());
            mac.set_key(key);
            mac.start(nullptr, 0);

            std::unique_ptr<Timer> timer = make_timer(mac.name(), buffer.size(), "mac", provider, buf_size);
            timer->run_until_elapsed(runtime, [&]() { mac.update(buffer); });
            timer->run([&]() { mac.final(output.data()); });
            record_result(timer);
            }
         }
#endif

#if defined(BOTAN_HAS_CIPHER_MODES)
      void bench_cipher_mode(
         Botan::Cipher_Mode& enc,
         Botan::Cipher_Mode& dec,
         const std::chrono::milliseconds runtime,
         const std::vector<size_t>& buf_sizes)
         {
         std::unique_ptr<Timer> ks_timer = make_timer(enc.name(), enc.provider(), "key schedule");

         const Botan::SymmetricKey key(rng(), enc.key_spec().maximum_keylength());

         ks_timer->run([&]() { enc.set_key(key); });
         ks_timer->run([&]() { dec.set_key(key); });

         record_result(ks_timer);

         for(auto buf_size : buf_sizes)
            {
            Botan::secure_vector<uint8_t> buffer = rng().random_vec(buf_size);

            std::unique_ptr<Timer> encrypt_timer = make_timer(enc.name(), buffer.size(), "encrypt", enc.provider(), buf_size);
            std::unique_ptr<Timer> decrypt_timer = make_timer(dec.name(), buffer.size(), "decrypt", dec.provider(), buf_size);

            Botan::secure_vector<uint8_t> iv = rng().random_vec(enc.default_nonce_length());

            if(buf_size >= enc.minimum_final_size())
               {
               while(encrypt_timer->under(runtime) && decrypt_timer->under(runtime))
                  {
                  // Must run in this order, or AEADs will reject the ciphertext
                  encrypt_timer->run([&]() { enc.start(iv); enc.finish(buffer); });

                  decrypt_timer->run([&]() { dec.start(iv); dec.finish(buffer); });

                  if(iv.size() > 0)
                     {
                     iv[0] += 1;
                     }
                  }
               }

            record_result(encrypt_timer);
            record_result(decrypt_timer);
            }
         }
#endif

      void bench_rng(
         Botan::RandomNumberGenerator& rng,
         const std::string& rng_name,
         const std::chrono::milliseconds runtime,
         const std::vector<size_t>& buf_sizes)
         {
         for(auto buf_size : buf_sizes)
            {
            Botan::secure_vector<uint8_t> buffer(buf_size);

#if defined(BOTAN_HAS_SYSTEM_RNG)
            rng.reseed_from_rng(Botan::system_rng(), 256);
#endif

            std::unique_ptr<Timer> timer = make_timer(rng_name, buffer.size(), "generate", "", buf_size);
            timer->run_until_elapsed(runtime, [&]() { rng.randomize(buffer.data(), buffer.size()); });
            record_result(timer);
            }
         }

      void bench_entropy_sources(const std::chrono::milliseconds)
         {
         Botan::Entropy_Sources& srcs = Botan::Entropy_Sources::global_sources();

         for(auto src : srcs.enabled_sources())
            {
            size_t entropy_bits = 0;
            Botan_Tests::SeedCapturing_RNG rng;

            std::unique_ptr<Timer> timer = make_timer(src, "", "bytes");
            timer->run([&]() { entropy_bits = srcs.poll_just(rng, src); });

            size_t compressed_size = 0;

#if defined(BOTAN_HAS_ZLIB)
            std::unique_ptr<Botan::Compression_Algorithm> comp(Botan::make_compressor("zlib"));

            if(comp)
               {
               Botan::secure_vector<uint8_t> compressed;
               compressed.assign(rng.seed_material().begin(), rng.seed_material().end());
               comp->start(9);
               comp->finish(compressed);

               compressed_size = compressed.size();
               }
#endif

            std::ostringstream msg;

            msg << "Entropy source " << src << " output " << rng.seed_material().size() << " bytes"
                << " estimated entropy " << entropy_bits << " in " << timer->milliseconds() << " ms";

            if(compressed_size > 0)
               {
               msg << " output compressed to " << compressed_size << " bytes";
               }

            msg << " total samples " << rng.samples() << "\n";

            timer->set_custom_msg(msg.str());

            record_result(timer);
            }
         }

#if defined(BOTAN_HAS_ECC_GROUP)
      void bench_ecc_mult(const std::vector<std::string>& groups, const std::chrono::milliseconds runtime)
         {
         for(std::string group_name : groups)
            {
            const Botan::EC_Group group(group_name);

            std::unique_ptr<Timer> mult_timer = make_timer(group_name + " Montgomery ladder");
            std::unique_ptr<Timer> blinded_mult_timer = make_timer(group_name + " blinded comb");
            std::unique_ptr<Timer> blinded_var_mult_timer = make_timer(group_name + " blinded window");

            const Botan::PointGFp& base_point = group.get_base_point();

            std::vector<Botan::BigInt> ws;

            while(mult_timer->under(runtime) &&
                  blinded_mult_timer->under(runtime) &&
                  blinded_var_mult_timer->under(runtime))
               {
               const Botan::BigInt scalar(rng(), group.get_p_bits());

               const Botan::PointGFp r1 = mult_timer->run([&]() { return base_point * scalar; });

               const Botan::PointGFp r2 = blinded_mult_timer->run(
                  [&]() { return group.blinded_base_point_multiply(scalar, rng(), ws); });

               const Botan::PointGFp r3 = blinded_var_mult_timer->run(
                  [&]() { return group.blinded_var_point_multiply(base_point, scalar, rng(), ws); });

               BOTAN_ASSERT_EQUAL(r1, r2, "Same point computed by Montgomery and comb");
               BOTAN_ASSERT_EQUAL(r1, r3, "Same point computed by Montgomery and window");
               }

            record_result(mult_timer);
            record_result(blinded_mult_timer);
            record_result(blinded_var_mult_timer);
            }
         }

      void bench_os2ecp(const std::vector<std::string>& groups, const std::chrono::milliseconds runtime)
         {
         std::unique_ptr<Timer> uncmp_timer = make_timer("OS2ECP uncompressed");
         std::unique_ptr<Timer> cmp_timer = make_timer("OS2ECP compressed");

         for(std::string group_name : groups)
            {
            const Botan::EC_Group group(group_name);

            while(uncmp_timer->under(runtime) && cmp_timer->under(runtime))
               {
               const Botan::BigInt k(rng(), 256);
               const Botan::PointGFp p = group.get_base_point() * k;
               const std::vector<uint8_t> os_cmp = p.encode(Botan::PointGFp::COMPRESSED);
               const std::vector<uint8_t> os_uncmp = p.encode(Botan::PointGFp::UNCOMPRESSED);

               uncmp_timer->run([&]() { group.OS2ECP(os_uncmp); });
               cmp_timer->run([&]() { group.OS2ECP(os_cmp); });
               }

            record_result(uncmp_timer);
            record_result(cmp_timer);
            }
         }

#endif

#if defined(BOTAN_HAS_FPE_FE1)

      void bench_fpe_fe1(const std::chrono::milliseconds runtime)
         {
         const Botan::BigInt n = 1000000000000000;

         std::unique_ptr<Timer> enc_timer = make_timer("FPE_FE1 encrypt");
         std::unique_ptr<Timer> dec_timer = make_timer("FPE_FE1 decrypt");

         const Botan::SymmetricKey key(rng(), 32);
         const std::vector<uint8_t> tweak(8); // 8 zeros

         Botan::BigInt x = 1;

         Botan::FPE_FE1 fpe_fe1(n, 3, "HMAC(SHA-256)");
         fpe_fe1.set_key(key);

         while(enc_timer->under(runtime))
            {
            enc_timer->start();
            x = fpe_fe1.encrypt(x, tweak.data(), tweak.size());
            enc_timer->stop();
            }

         for(size_t i = 0; i != enc_timer->events(); ++i)
            {
            dec_timer->start();
            x = fpe_fe1.decrypt(x, tweak.data(), tweak.size());
            dec_timer->stop();
            }

         BOTAN_ASSERT(x == 1, "FPE works");

         record_result(enc_timer);
         record_result(dec_timer);
         }
#endif

#if defined(BOTAN_HAS_RFC3394_KEYWRAP)

      void bench_rfc3394(const std::chrono::milliseconds runtime)
         {
         std::unique_ptr<Timer> wrap_timer = make_timer("RFC3394 AES-256 key wrap");
         std::unique_ptr<Timer> unwrap_timer = make_timer("RFC3394 AES-256 key unwrap");

         const Botan::SymmetricKey kek(rng(), 32);
         Botan::secure_vector<uint8_t> key(64, 0);

         while(wrap_timer->under(runtime))
            {
            wrap_timer->start();
            key = Botan::rfc3394_keywrap(key, kek);
            wrap_timer->stop();

            unwrap_timer->start();
            key = Botan::rfc3394_keyunwrap(key, kek);
            unwrap_timer->stop();

            key[0] += 1;
            }

         record_result(wrap_timer);
         record_result(unwrap_timer);
         }
#endif

#if defined(BOTAN_HAS_DL_GROUP)

      void bench_modexp(const std::chrono::milliseconds runtime)
         {
         for(size_t group_bits : { 1024, 1536, 2048, 3072, 4096 })
            {
            const std::string group_bits_str = std::to_string(group_bits);
            const Botan::DL_Group group("modp/srp/" + group_bits_str);

            const size_t e_bits = Botan::dl_exponent_size(group_bits);
            const size_t f_bits = group_bits - 1;

            const Botan::BigInt random_e(rng(), e_bits);
            const Botan::BigInt random_f(rng(), f_bits);

            std::unique_ptr<Timer> e_timer = make_timer(group_bits_str + " short exponent", "", "modexp");
            std::unique_ptr<Timer> f_timer = make_timer(group_bits_str + "  full exponent", "", "modexp");

            while(f_timer->under(runtime))
               {
               e_timer->run([&]() { Botan::power_mod(group.get_g(), random_e, group.get_p()); });
               f_timer->run([&]() { Botan::power_mod(group.get_g(), random_f, group.get_p()); });
               }

            record_result(e_timer);
            record_result(f_timer);
            }
         }
#endif

#if defined(BOTAN_HAS_NUMBERTHEORY)
      void bench_bn_redc(const std::chrono::milliseconds runtime)
         {
         Botan::BigInt p;
         p.set_bit(521);
         p--;

         std::unique_ptr<Timer> barrett_timer = make_timer("Barrett");
         std::unique_ptr<Timer> schoolbook_timer = make_timer("Schoolbook");

         Botan::Modular_Reducer mod_p(p);

         while(schoolbook_timer->under(runtime))
            {
            const Botan::BigInt x(rng(), p.bits() * 2 - 2);

            const Botan::BigInt r1 = barrett_timer->run(
               [&] { return mod_p.reduce(x); });
            const Botan::BigInt r2 = schoolbook_timer->run(
               [&] { return x % p; });

            BOTAN_ASSERT(r1 == r2, "Computed different results");
            }

         record_result(barrett_timer);
         record_result(schoolbook_timer);
         }

      void bench_inverse_mod(const std::chrono::milliseconds runtime)
         {
         Botan::BigInt p;
         p.set_bit(521);
         p--;

         std::unique_ptr<Timer> invmod_timer = make_timer("inverse_euclid");
         std::unique_ptr<Timer> monty_timer = make_timer("montgomery_inverse");
         std::unique_ptr<Timer> ct_invmod_timer = make_timer("ct_inverse_mod");
         std::unique_ptr<Timer> powm_timer = make_timer("exponentiation");

         Botan::Fixed_Exponent_Power_Mod powm_p(p - 2, p);

         while(invmod_timer->under(runtime))
            {
            const Botan::BigInt x(rng(), p.bits() - 1);

            const Botan::BigInt x_inv1 = invmod_timer->run([&]
               {
               return Botan::inverse_euclid(x + p, p);
               });

            const Botan::BigInt x_inv2 = monty_timer->run([&]
               {
               return Botan::normalized_montgomery_inverse(x, p);
               });

            const Botan::BigInt x_inv3 = ct_invmod_timer->run([&]
               {
               return Botan::ct_inverse_mod_odd_modulus(x, p);
               });

            const Botan::BigInt x_inv4 = powm_timer->run([&]
               {
               return powm_p(x);
               });

            BOTAN_ASSERT_EQUAL(x_inv1, x_inv2, "Same result");
            BOTAN_ASSERT_EQUAL(x_inv1, x_inv3, "Same result");
            BOTAN_ASSERT_EQUAL(x_inv1, x_inv4, "Same result");
            }

         record_result(invmod_timer);
         record_result(monty_timer);
         record_result(ct_invmod_timer);
         record_result(powm_timer);
         }

      void bench_random_prime(const std::chrono::milliseconds runtime)
         {
         const size_t coprime = 65537; // simulates RSA key gen

         for(size_t bits : { 1024, 1536 })
            {
            std::unique_ptr<Timer> genprime_timer = make_timer("random_prime " + std::to_string(bits));
            std::unique_ptr<Timer> is_prime_timer = make_timer("is_prime " + std::to_string(bits));

            while(genprime_timer->under(runtime) && is_prime_timer->under(runtime))
               {
               const Botan::BigInt p = genprime_timer->run([&]
                  {
                  return Botan::random_prime(rng(), bits, coprime);
                  });

               const bool ok = is_prime_timer->run([&]
                  {
                  return Botan::is_prime(p, rng(), 64, true);
                  });

               if(!ok)
                  {
                  error_output() << "Generated prime " << p
                                 << " which then failed primality test";
                  }

               // Now test p+2, p+4, ... which may or may not be prime
               for(size_t i = 2; i != 64; i += 2)
                  {
                  is_prime_timer->run([&]() { Botan::is_prime(p, rng(), 64, true); });
                  }
               }

            record_result(genprime_timer);
            record_result(is_prime_timer);
            }
         }
#endif

#if defined(BOTAN_HAS_PUBLIC_KEY_CRYPTO)
      void bench_pk_enc(
         const Botan::Private_Key& key,
         const std::string& nm,
         const std::string& provider,
         const std::string& padding,
         std::chrono::milliseconds msec)
         {
         std::vector<uint8_t> plaintext, ciphertext;

         Botan::PK_Encryptor_EME enc(key, rng(), padding, provider);
         Botan::PK_Decryptor_EME dec(key, rng(), padding, provider);

         std::unique_ptr<Timer> enc_timer = make_timer(nm + " " + padding, provider, "encrypt");
         std::unique_ptr<Timer> dec_timer = make_timer(nm + " " + padding, provider, "decrypt");

         while(enc_timer->under(msec) || dec_timer->under(msec))
            {
            // Generate a new random ciphertext to decrypt
            if(ciphertext.empty() || enc_timer->under(msec))
               {
               plaintext = unlock(rng().random_vec(enc.maximum_input_size()));
               ciphertext = enc_timer->run([&]() { return enc.encrypt(plaintext, rng()); });
               }

            if(dec_timer->under(msec))
               {
               auto dec_pt = dec_timer->run([&]() { return dec.decrypt(ciphertext); });

               if(dec_pt != plaintext) // sanity check
                  {
                  error_output() << "Bad roundtrip in PK encrypt/decrypt bench\n";
                  }
               }
            }

         record_result(enc_timer);
         record_result(dec_timer);
         }

      void bench_pk_ka(const std::string& algo,
                       const std::string& nm,
                       const std::string& params,
                       const std::string& provider,
                       std::chrono::milliseconds msec)
         {
         const std::string kdf = "KDF2(SHA-256)"; // arbitrary choice

         std::unique_ptr<Timer> keygen_timer = make_timer(nm, provider, "keygen");

         std::unique_ptr<Botan::Private_Key> key1(keygen_timer->run([&]
            {
            return Botan::create_private_key(algo, rng(), params);
            }));
         std::unique_ptr<Botan::Private_Key> key2(keygen_timer->run([&]
            {
            return Botan::create_private_key(algo, rng(), params);
            }));

         record_result(keygen_timer);

         const Botan::PK_Key_Agreement_Key& ka_key1 = dynamic_cast<const Botan::PK_Key_Agreement_Key&>(*key1);
         const Botan::PK_Key_Agreement_Key& ka_key2 = dynamic_cast<const Botan::PK_Key_Agreement_Key&>(*key2);

         Botan::PK_Key_Agreement ka1(ka_key1, rng(), kdf, provider);
         Botan::PK_Key_Agreement ka2(ka_key2, rng(), kdf, provider);

         const std::vector<uint8_t> ka1_pub = ka_key1.public_value();
         const std::vector<uint8_t> ka2_pub = ka_key2.public_value();

         std::unique_ptr<Timer> ka_timer = make_timer(nm, provider, "key agreements");

         while(ka_timer->under(msec))
            {
            Botan::SymmetricKey symkey1 = ka_timer->run([&]() { return ka1.derive_key(32, ka2_pub); });
            Botan::SymmetricKey symkey2 = ka_timer->run([&]() { return ka2.derive_key(32, ka1_pub); });

            if(symkey1 != symkey2)
               {
               error_output() << "Key agreement mismatch in PK bench\n";
               }
            }

         record_result(ka_timer);
         }

      void bench_pk_kem(const Botan::Private_Key& key,
                        const std::string& nm,
                        const std::string& provider,
                        const std::string& kdf,
                        std::chrono::milliseconds msec)
         {
         Botan::PK_KEM_Decryptor dec(key, rng(), kdf, provider);
         Botan::PK_KEM_Encryptor enc(key, rng(), kdf, provider);

         std::unique_ptr<Timer> kem_enc_timer = make_timer(nm, provider, "KEM encrypt");
         std::unique_ptr<Timer> kem_dec_timer = make_timer(nm, provider, "KEM decrypt");

         while(kem_enc_timer->under(msec) && kem_dec_timer->under(msec))
            {
            Botan::secure_vector<uint8_t> encap_key, enc_shared_key;
            Botan::secure_vector<uint8_t> salt = rng().random_vec(16);

            kem_enc_timer->start();
            enc.encrypt(encap_key, enc_shared_key, 64, rng(), salt);
            kem_enc_timer->stop();

            kem_dec_timer->start();
            Botan::secure_vector<uint8_t> dec_shared_key = dec.decrypt(encap_key, 64, salt);
            kem_dec_timer->stop();

            if(enc_shared_key != dec_shared_key)
               {
               error_output() << "KEM mismatch in PK bench\n";
               }
            }

         record_result(kem_enc_timer);
         record_result(kem_dec_timer);
         }

      void bench_pk_sig_ecc(const std::string& algo,
                            const std::string& emsa,
                            const std::string& provider,
                            const std::vector<std::string>& params,
                            std::chrono::milliseconds msec)
         {
         for(std::string grp : params)
            {
            const std::string nm = grp.empty() ? algo : (algo + "-" + grp);

            std::unique_ptr<Timer> keygen_timer = make_timer(nm, provider, "keygen");

            std::unique_ptr<Botan::Private_Key> key(keygen_timer->run([&]
               {
               return Botan::create_private_key(algo, rng(), grp);
               }));

            record_result(keygen_timer);
            bench_pk_sig(*key, nm, provider, emsa, msec);
            }
         }

      void bench_pk_sig(const Botan::Private_Key& key,
                        const std::string& nm,
                        const std::string& provider,
                        const std::string& padding,
                        std::chrono::milliseconds msec)
         {
         std::vector<uint8_t> message, signature, bad_signature;

         Botan::PK_Signer   sig(key, rng(), padding, Botan::IEEE_1363, provider);
         Botan::PK_Verifier ver(key, padding, Botan::IEEE_1363, provider);

         std::unique_ptr<Timer> sig_timer = make_timer(nm + " " + padding, provider, "sign");
         std::unique_ptr<Timer> ver_timer = make_timer(nm + " " + padding, provider, "verify");

         while(ver_timer->under(msec) || sig_timer->under(msec))
            {
            if(signature.empty() || sig_timer->under(msec))
               {
               /*
               Length here is kind of arbitrary, but 48 bytes fits into a single
               hash block so minimizes hashing overhead versus the PK op itself.
               */
               message = unlock(rng().random_vec(48));

               signature = sig_timer->run([&]() { return sig.sign_message(message, rng()); });

               bad_signature = signature;
               bad_signature[rng().next_byte() % bad_signature.size()] ^= rng().next_nonzero_byte();
               }

            if(ver_timer->under(msec))
               {
               const bool verified = ver_timer->run([&]
                  {
                  return ver.verify_message(message, signature);
                  });

               if(!verified)
                  {
                  error_output() << "Correct signature rejected in PK signature bench\n";
                  }

               const bool verified_bad = ver_timer->run([&]
                  {
                  return ver.verify_message(message, bad_signature);
                  });

               if(verified_bad)
                  {
                  error_output() << "Bad signature accepted in PK signature bench\n";
                  }
               }
            }

         record_result(sig_timer);
         record_result(ver_timer);
         }
#endif

#if defined(BOTAN_HAS_RSA)
      void bench_rsa(const std::string& provider,
                     std::chrono::milliseconds msec)
         {
         for(size_t keylen : { 1024, 2048, 3072, 4096 })
            {
            const std::string nm = "RSA-" + std::to_string(keylen);

            std::unique_ptr<Timer> keygen_timer = make_timer(nm, provider, "keygen");

            std::unique_ptr<Botan::Private_Key> key(keygen_timer->run([&]
               {
               return Botan::create_private_key("RSA", rng(), std::to_string(keylen));
               }));

            record_result(keygen_timer);

            // Using PKCS #1 padding so OpenSSL provider can play along
            bench_pk_sig(*key, nm, provider, "EMSA-PKCS1-v1_5(SHA-256)", msec);

            //bench_pk_sig(*key, nm, provider, "PSSR(SHA-256)", msec);
            //bench_pk_enc(*key, nm, provider, "EME-PKCS1-v1_5", msec);
            //bench_pk_enc(*key, nm, provider, "OAEP(SHA-1)", msec);
            }
         }
#endif

#if defined(BOTAN_HAS_ECDSA)
      void bench_ecdsa(const std::vector<std::string>& groups,
                       const std::string& provider,
                       std::chrono::milliseconds msec)
         {
         return bench_pk_sig_ecc("ECDSA", "EMSA1(SHA-256)", provider, groups, msec);
         }
#endif

#if defined(BOTAN_HAS_ECKCDSA)
      void bench_eckcdsa(const std::vector<std::string>& groups,
                         const std::string& provider,
                         std::chrono::milliseconds msec)
         {
         return bench_pk_sig_ecc("ECKCDSA", "EMSA1(SHA-256)", provider, groups, msec);
         }
#endif

#if defined(BOTAN_HAS_GOST_34_10_2001)
      void bench_gost_3410(const std::string& provider,
                           std::chrono::milliseconds msec)
         {
         return bench_pk_sig_ecc("GOST-34.10", "EMSA1(GOST-34.11)", provider, {"gost_256A"}, msec);
         }
#endif

#if defined(BOTAN_HAS_SM2)
      void bench_sm2(const std::vector<std::string>& groups,
                     const std::string& provider,
                     std::chrono::milliseconds msec)
         {
         return bench_pk_sig_ecc("SM2_Sig", "SM3", provider, groups, msec);
         }
#endif

#if defined(BOTAN_HAS_ECGDSA)
      void bench_ecgdsa(const std::vector<std::string>& groups,
                        const std::string& provider,
                        std::chrono::milliseconds msec)
         {
         return bench_pk_sig_ecc("ECGDSA", "EMSA1(SHA-256)", provider, groups, msec);
         }
#endif

#if defined(BOTAN_HAS_ED25519)
      void bench_ed25519(const std::string& provider,
                         std::chrono::milliseconds msec)
         {
         return bench_pk_sig_ecc("Ed25519", "Pure", provider, std::vector<std::string>{""}, msec);
         }
#endif

#if defined(BOTAN_HAS_DIFFIE_HELLMAN)
      void bench_dh(const std::string& provider,
                    std::chrono::milliseconds msec)
         {
         for(size_t bits : { 1024, 2048, 3072, 4096, 6144, 8192 })
            {
            bench_pk_ka("DH",
                        "DH-" + std::to_string(bits),
                        "modp/ietf/" + std::to_string(bits),
                        provider, msec);
            }
         }
#endif

#if defined(BOTAN_HAS_DSA)
      void bench_dsa(const std::string& provider, std::chrono::milliseconds msec)
         {
         for(size_t bits : { 1024, 2048, 3072 })
            {
            const std::string nm = "DSA-" + std::to_string(bits);

            const std::string params =
               (bits == 1024) ? "dsa/jce/1024" : ("dsa/botan/" + std::to_string(bits));

            std::unique_ptr<Timer> keygen_timer = make_timer(nm, provider, "keygen");

            std::unique_ptr<Botan::Private_Key> key(keygen_timer->run([&]
               {
               return Botan::create_private_key("DSA", rng(), params);
               }));

            record_result(keygen_timer);

            bench_pk_sig(*key, nm, provider, "EMSA1(SHA-256)", msec);
            }
         }
#endif

#if defined(BOTAN_HAS_ELGAMAL)
      void bench_elgamal(const std::string& provider, std::chrono::milliseconds msec)
         {
         for(size_t keylen : { 1024, 2048, 3072, 4096 })
            {
            const std::string nm = "ElGamal-" + std::to_string(keylen);

            const std::string params = "modp/ietf/" + std::to_string(keylen);

            std::unique_ptr<Timer> keygen_timer = make_timer(nm, provider, "keygen");

            std::unique_ptr<Botan::Private_Key> key(keygen_timer->run([&]
               {
               return Botan::create_private_key("ElGamal", rng(), params);
               }));

            record_result(keygen_timer);

            bench_pk_enc(*key, nm, provider, "EME-PKCS1-v1_5", msec);
            }
         }
#endif

#if defined(BOTAN_HAS_ECDH)
      void bench_ecdh(const std::vector<std::string>& groups,
                      const std::string& provider,
                      std::chrono::milliseconds msec)
         {
         for(std::string grp : groups)
            {
            bench_pk_ka("ECDH", "ECDH-" + grp, grp, provider, msec);
            }
         }
#endif

#if defined(BOTAN_HAS_CURVE_25519)
      void bench_curve25519(const std::string& provider,
                            std::chrono::milliseconds msec)
         {
         bench_pk_ka("Curve25519", "Curve25519", "", provider, msec);
         }
#endif

#if defined(BOTAN_HAS_MCELIECE)
      void bench_mceliece(const std::string& provider,
                          std::chrono::milliseconds msec)
         {
         /*
         SL=80 n=1632 t=33 - 59 KB pubkey 140 KB privkey
         SL=107 n=2480 t=45 - 128 KB pubkey 300 KB privkey
         SL=128 n=2960 t=57 - 195 KB pubkey 459 KB privkey
         SL=147 n=3408 t=67 - 265 KB pubkey 622 KB privkey
         SL=191 n=4624 t=95 - 516 KB pubkey 1234 KB privkey
         SL=256 n=6624 t=115 - 942 KB pubkey 2184 KB privkey
         */

         const std::vector<std::pair<size_t, size_t>> mce_params =
            {
               { 2480, 45 },
               { 2960, 57 },
               { 3408, 67 },
               { 4624, 95 },
               { 6624, 115 }
            };

         for(auto params : mce_params)
            {
            size_t n = params.first;
            size_t t = params.second;

            const std::string nm = "McEliece-" + std::to_string(n) + "," + std::to_string(t) +
                                   " (WF=" + std::to_string(Botan::mceliece_work_factor(n, t)) + ")";

            std::unique_ptr<Timer> keygen_timer = make_timer(nm, provider, "keygen");

            std::unique_ptr<Botan::Private_Key> key(keygen_timer->run([&]
               {
               return new Botan::McEliece_PrivateKey(rng(), n, t);
               }));

            record_result(keygen_timer);
            bench_pk_kem(*key, nm, provider, "KDF2(SHA-256)", msec);
            }
         }
#endif

#if defined(BOTAN_HAS_XMSS)
      void bench_xmss(const std::string& provider,
                      std::chrono::milliseconds msec)
         {
         // H16 and H20 signatures take an hour or more to generate
         std::vector<std::string> xmss_params
            {
            "XMSS_SHA2-256_W16_H10",
            "XMSS_SHA2-512_W16_H10",
            "XMSS_SHAKE128_W16_H10",
            "XMSS_SHAKE256_W16_H10",
            };

         for(std::string params : xmss_params)
            {
            std::unique_ptr<Timer> keygen_timer = make_timer(params, provider, "keygen");

            std::unique_ptr<Botan::Private_Key> key(keygen_timer->run([&]
               {
               return Botan::create_private_key("XMSS", rng(), params);
               }));

            record_result(keygen_timer);
            bench_pk_sig(*key, params, provider, "", msec);
            }
         }
#endif


#if defined(BOTAN_HAS_NEWHOPE) && defined(BOTAN_HAS_CHACHA_RNG)
      void bench_newhope(const std::string& /*provider*/,
                         std::chrono::milliseconds msec)
         {
         const std::string nm = "NEWHOPE";

         std::unique_ptr<Timer> keygen_timer = make_timer(nm, "", "keygen");
         std::unique_ptr<Timer> shareda_timer = make_timer(nm, "", "shareda");
         std::unique_ptr<Timer> sharedb_timer = make_timer(nm, "", "sharedb");

         Botan::ChaCha_RNG nh_rng(Botan::secure_vector<uint8_t>(32));

         while(sharedb_timer->under(msec))
            {
            std::vector<uint8_t> send_a(Botan::NEWHOPE_SENDABYTES), send_b(Botan::NEWHOPE_SENDBBYTES);
            std::vector<uint8_t> shared_a(32), shared_b(32);

            Botan::newhope_poly sk_a;

            keygen_timer->start();
            Botan::newhope_keygen(send_a.data(), &sk_a, nh_rng);
            keygen_timer->stop();

            sharedb_timer->start();
            Botan::newhope_sharedb(shared_b.data(), send_b.data(), send_a.data(), nh_rng);
            sharedb_timer->stop();

            shareda_timer->start();
            Botan::newhope_shareda(shared_a.data(), &sk_a, send_b.data());
            shareda_timer->stop();

            BOTAN_ASSERT(shared_a == shared_b, "Same derived key");
            }

         record_result(keygen_timer);
         record_result(shareda_timer);
         record_result(sharedb_timer);
         }
#endif

   };

BOTAN_REGISTER_COMMAND("speed", Speed);

}