sha1.h

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/*
* SHA-1
* (C) 1999-2007,2016 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/
 
#ifndef BOTAN_SHA1_H_
#define BOTAN_SHA1_H_
 
#include <botan/internal/mdx_hash.h>
 
namespace Botan {
 
/**
* NIST's SHA-1
*/
class SHA_1 final : public HashFunction {
   public:
      using digest_type = secure_vector<uint32_t>;
 
      static constexpr MD_Endian byte_endianness = MD_Endian::Big;
      static constexpr MD_Endian bit_endianness = MD_Endian::Big;
      static constexpr size_t block_bytes = 64;
      static constexpr size_t output_bytes = 20;
      static constexpr size_t ctr_bytes = 8;
 
      static void compress_n(digest_type& digest, std::span<const uint8_t> input, size_t blocks);
      static void init(digest_type& digest);
 
   public:
      std::string name() const override { return "SHA-1"; }
 
      size_t output_length() const override { return 20; }
 
      size_t hash_block_size() const override { return block_bytes; }
 
      // Collision attacks with cost ~2^61 are known (Leurent and Peyrin, 2020)
      size_t security_level() const override { return 61; }
 
      std::unique_ptr<HashFunction> new_object() const override;
 
      std::unique_ptr<HashFunction> copy_state() const override;
 
      std::string provider() const override;
 
      void clear() override { m_md.clear(); }
 
#if defined(BOTAN_HAS_SHA1_ARMV8)
      static void sha1_armv8_compress_n(digest_type& digest, std::span<const uint8_t> blocks, size_t block_count);
#endif
 
#if defined(BOTAN_HAS_SHA1_SIMD_4X32)
      static void simd_compress_n(digest_type& digest, std::span<const uint8_t> blocks, size_t block_count);
#endif
 
#if defined(BOTAN_HAS_SHA1_AVX2)
      static void avx2_compress_n(digest_type& digest, std::span<const uint8_t> blocks, size_t block_count);
#endif
 
#if defined(BOTAN_HAS_SHA1_X86_SHA_NI)
      // Using x86 SHA instructions in Intel Goldmont and Cannonlake
      static void sha1_compress_x86(digest_type& digest, std::span<const uint8_t> blocks, size_t block_count);
#endif
 
   private:
      void add_data(std::span<const uint8_t> input) override;
 
      void final_result(std::span<uint8_t> output) override;
 
   private:
      MerkleDamgard_Hash<SHA_1> m_md;
};
 
}  // namespace Botan
 
#endif