sha2_32.h

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/*
* 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/mdx_hash.h>

namespace Botan {

/**
* SHA-224
*/
class BOTAN_PUBLIC_API(2,0) 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;

      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 BOTAN_PUBLIC_API(2,0) 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;

      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