/*

* SHA-{224,256}

* (C) 1999-2011 Jack Lloyd

*     2007 FlexSecure GmbH

*

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

*/

#ifndef BOTAN_SHA_224_256_H_

#define BOTAN_SHA_224_256_H_

#include <botan/internal/mdx_hash.h>

namespace Botan {

/**

* SHA-224

*/

class SHA_224 final : public MDx_HashFunction

   {

   public:

      std::string name() const override { return "SHA-224"; }

      size_t output_length() const override { return 28; }

      HashFunction* clone() const override { return new SHA_224; }

      std::unique_ptr<HashFunction> copy_state() const override;

      void clear() override;

      std::string provider() const override;

      SHA_224() : MDx_HashFunction(64, true, true), m_digest(8)

         { clear(); }

   private:

      void compress_n(const uint8_t[], size_t blocks) override;

      void copy_out(uint8_t[]) override;

      secure_vector<uint32_t> m_digest;

   };

/**

* SHA-256

*/

class SHA_256 final : public MDx_HashFunction

   {

   public:

      std::string name() const override { return "SHA-256"; }

      size_t output_length() const override { return 32; }

      HashFunction* clone() const override { return new SHA_256; }

      std::unique_ptr<HashFunction> copy_state() const override;

      void clear() override;

      std::string provider() const override;

      SHA_256() : MDx_HashFunction(64, true, true), m_digest(8)

         { clear(); }

      /*

      * Perform a SHA-256 compression. For internal use

      */

      static void compress_digest(secure_vector<uint32_t>& digest,

                                  const uint8_t input[],

                                  size_t blocks);

   private:

#if defined(BOTAN_HAS_SHA2_32_ARMV8)

      static void compress_digest_armv8(secure_vector<uint32_t>& digest,

                                        const uint8_t input[],

                                        size_t blocks);

#endif

#if defined(BOTAN_HAS_SHA2_32_X86_BMI2)

      static void compress_digest_x86_bmi2(secure_vector<uint32_t>& digest,

                                           const uint8_t input[],

                                           size_t blocks);

#endif

#if defined(BOTAN_HAS_SHA2_32_X86)

      static void compress_digest_x86(secure_vector<uint32_t>& digest,

                                      const uint8_t input[],

                                      size_t blocks);

#endif

      void compress_n(const uint8_t[], size_t blocks) override;

      void copy_out(uint8_t[]) override;

      secure_vector<uint32_t> m_digest;

   };

}

#endif