/*

* (C) 2018 Ribose Inc

*

* Botan is released under the Simplified BSD License (see license.txt)

*/

#include <botan/pwdhash.h>

#include <botan/exceptn.h>

#include <botan/internal/scan_name.h>

#if defined(BOTAN_HAS_PBKDF2)

   #include <botan/pbkdf2.h>

#endif

#if defined(BOTAN_HAS_PGP_S2K)

   #include <botan/pgp_s2k.h>

#endif

#if defined(BOTAN_HAS_SCRYPT)

   #include <botan/scrypt.h>

#endif

#if defined(BOTAN_HAS_ARGON2)

   #include <botan/argon2.h>

#endif

#if defined(BOTAN_HAS_PBKDF_BCRYPT)

   #include <botan/bcrypt_pbkdf.h>

#endif

namespace Botan {

void PasswordHash::derive_key(uint8_t out[], size_t out_len,

                              const char* password, size_t password_len,

                              const uint8_t salt[], size_t salt_len,

                              const uint8_t ad[], size_t ad_len,

                              const uint8_t key[], size_t key_len) const

   {

   BOTAN_UNUSED(ad, key);

   if(ad_len == 0 && key_len == 0)

      return this->derive_key(out, out_len,

                              password, password_len,

                              salt, salt_len);

   else

      throw Not_Implemented("PasswordHash " + this->to_string() + " does not support AD or key");

   }

std::unique_ptr<PasswordHashFamily> PasswordHashFamily::create(const std::string& algo_spec,

                                     const std::string& provider)

   {

   const SCAN_Name req(algo_spec);

#if defined(BOTAN_HAS_PBKDF2)

   if(req.algo_name() == "PBKDF2")

      {

      if(provider.empty() || provider == "base")

         {

         if(auto mac = MessageAuthenticationCode::create("HMAC(" + req.arg(0) + ")"))

            return std::make_unique<PBKDF2_Family>(mac.release());

         if(auto mac = MessageAuthenticationCode::create(req.arg(0)))

            return std::make_unique<PBKDF2_Family>(mac.release());

         }

      return nullptr;

      }

#endif

#if defined(BOTAN_HAS_SCRYPT)

   if(req.algo_name() == "Scrypt")

      {

      return std::make_unique<Scrypt_Family>();

      }

#endif

#if defined(BOTAN_HAS_ARGON2)

   if(req.algo_name() == "Argon2d")

      {

      return std::make_unique<Argon2_Family>(static_cast<uint8_t>(0));

      }

   else if(req.algo_name() == "Argon2i")

      {

      return std::make_unique<Argon2_Family>(static_cast<uint8_t>(1));

      }

   else if(req.algo_name() == "Argon2id")

      {

      return std::make_unique<Argon2_Family>(static_cast<uint8_t>(2));

      }

#endif

#if defined(BOTAN_HAS_PBKDF_BCRYPT)

   if(req.algo_name() == "Bcrypt-PBKDF")

      {

      return std::make_unique<Bcrypt_PBKDF_Family>();

      }

#endif

#if defined(BOTAN_HAS_PGP_S2K)

   if(req.algo_name() == "OpenPGP-S2K" && req.arg_count() == 1)

      {

      if(auto hash = HashFunction::create(req.arg(0)))

         {

         return std::make_unique<RFC4880_S2K_Family>(hash.release());

         }

      }

#endif

   BOTAN_UNUSED(req);

   BOTAN_UNUSED(provider);

   return nullptr;

   }

//static

std::unique_ptr<PasswordHashFamily>

PasswordHashFamily::create_or_throw(const std::string& algo,

                             const std::string& provider)

   {

   if(auto pbkdf = PasswordHashFamily::create(algo, provider))

      {

      return pbkdf;

      }

   throw Lookup_Error("PasswordHashFamily", algo, provider);

   }

std::vector<std::string> PasswordHashFamily::providers(const std::string& algo_spec)

   {

   return probe_providers_of<PasswordHashFamily>(algo_spec);

   }

}