sha-256 impl

include/boost/hash2/sha2.hpp

@@ -0,0 +1,229 @@
+#ifndef SHA2_HPP_INCLUDED
+#define SHA2_HPP_INCLUDED
+
+// Copyright 2024 Peter Dimov.
+// Copyright 2024 Christian Mazakas.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+//
+// SHA2 message digest algorithm, https://csrc.nist.gov/pubs/fips/180-4/upd1/final, https://www.rfc-editor.org/rfc/rfc6234
+
+#include <boost/hash2/detail/read.hpp>
+#include <boost/hash2/detail/rot.hpp>
+#include <boost/hash2/detail/write.hpp>
+#include <boost/assert.hpp>
+#include <boost/cstdint.hpp>
+#include <array>
+#include <cstddef>
+#include <cstdint>
+#include <cstring>
+
+namespace boost
+{
+namespace hash2
+{
+
+class sha2_256
+{
+private:
+
+    std::uint32_t state_[ 8 ];
+
+    static const int N = 64;
+
+    unsigned char buffer_[ N ];
+    std::size_t m_; // == n_ % N
+
+    std::uint64_t n_;
+
+private:
+
+    void init()
+    {
+        state_[ 0 ] = 0x6a09e667;
+        state_[ 1 ] = 0xbb67ae85;
+        state_[ 2 ] = 0x3c6ef372;
+        state_[ 3 ] = 0xa54ff53a;
+        state_[ 4 ] = 0x510e527f;
+        state_[ 5 ] = 0x9b05688c;
+        state_[ 6 ] = 0x1f83d9ab;
+        state_[ 7 ] = 0x5be0cd19;
+    }
+
+    static std::uint32_t Sigma0( std::uint32_t x ) noexcept
+    {
+        return detail::rotr( x, 2 ) ^ detail::rotr( x, 13 ) ^ detail::rotr( x, 22 );
+    }
+
+    static std::uint32_t Sigma1( std::uint32_t x ) noexcept
+    {
+        return detail::rotr( x, 6 ) ^ detail::rotr( x, 11 ) ^ detail::rotr( x, 25 );
+    }
+
+    static std::uint32_t sigma0( std::uint32_t x ) noexcept
+    {
+        return detail::rotr( x, 7 ) ^ detail::rotr( x, 18 ) ^ ( x >> 3 );
+    }
+
+    static std::uint32_t sigma1( std::uint32_t x ) noexcept
+    {
+        return detail::rotr( x, 17 ) ^ detail::rotr( x, 19 ) ^ ( x >> 10 );
+    }
+
+    static std::uint32_t Ch( std::uint32_t x, std::uint32_t y, std::uint32_t z ) noexcept
+    {
+        return ( x & y ) ^ ( ~x & z );
+    }
+
+    static std::uint32_t Maj( std::uint32_t x, std::uint32_t y, std::uint32_t z ) noexcept
+    {
+        return ( x & y ) ^ ( x & z ) ^ ( y & z );
+    }
+
+    void transform( unsigned char const block[ 64 ] )
+    {
+        constexpr static std::uint32_t const K[ 64 ] =
+        {
+            0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
+            0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
+            0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
+            0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
+            0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
+            0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
+            0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
+            0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2,
+        };
+
+        std::uint32_t W[ 64 ];
+
+        for( int t = 0; t < 16; ++t )
+        {
+            W[ t ] = detail::read32be( block + t * 4 );
+        }
+
+        for( int t = 16; t < 64; ++t )
+        {
+            W[ t ] = ( sigma1( W[ t - 2 ] ) + W[ t - 7] + sigma0( W[ t - 15 ] ) + W[ t - 16 ] );
+        }
+
+        std::uint32_t a = state_[ 0 ];
+        std::uint32_t b = state_[ 1 ];
+        std::uint32_t c = state_[ 2 ];
+        std::uint32_t d = state_[ 3 ];
+        std::uint32_t e = state_[ 4 ];
+        std::uint32_t f = state_[ 5 ];
+        std::uint32_t g = state_[ 6 ];
+        std::uint32_t h = state_[ 7 ];
+
+        for( int t = 0; t < 64; ++t )
+        {
+            std::uint32_t T1 = h + Sigma1( e ) + Ch( e, f, g ) + K[ t ] + W[ t ];
+            std::uint32_t T2 = Sigma0( a ) + Maj( a, b, c );
+
+            h = g;
+            g = f;
+            f = e;
+            e = (d + T1);
+            d = c;
+            c = b;
+            b = a;
+            a = (T1 + T2);
+        }
+
+        state_[0] += a;
+        state_[1] += b;
+        state_[2] += c;
+        state_[3] += d;
+        state_[4] += e;
+        state_[5] += f;
+        state_[6] += g;
+        state_[7] += h;
+    }
+
+public:
+    using result_type = std::array<unsigned char, 32>;
+
+    sha2_256(): m_( 0 ), n_( 0 )
+    {
+        init();
+    }
+
+    void update( void const * pv, std::size_t n )
+    {
+        unsigned char const* p = static_cast<unsigned char const*>( pv );
+
+        BOOST_ASSERT( m_ == n_ % N );
+
+        n_ += n;
+
+        if( m_ > 0 )
+        {
+            std::size_t k = N - m_;
+
+            if( n < k )
+            {
+                k = n;
+            }
+
+            std::memcpy( buffer_ + m_, p, k );
+
+            p += k;
+            n -= k;
+            m_ += k;
+
+            if( m_ < N ) return;
+
+            BOOST_ASSERT( m_ == N );
+
+            transform( buffer_ );
+            m_ = 0;
+
+            std::memset( buffer_, 0, N );
+        }
+
+        BOOST_ASSERT( m_ == 0 );
+
+        while( n >= N )
+        {
+            transform( p );
+
+            p += N;
+            n -= N;
+        }
+
+        BOOST_ASSERT( n < N );
+
+        if( n > 0 )
+        {
+            std::memcpy( buffer_, p, n );
+            m_ = n;
+        }
+
+        BOOST_ASSERT( m_ == n_ % N );
+    }
+
+    result_type result()
+    {
+        unsigned char bits[ 8 ];
+        detail::write64be( bits, n_ * 8 );
+
+        std::size_t k = m_ < 56 ? 56 - m_ : 64 + 56 - m_;
+        unsigned char padding[ 64 ] = { 0x80 };
+
+        update( padding, k );
+        update( bits, 8 );
+        BOOST_ASSERT( m_ == 0 );
+
+        result_type digest;
+        for( int i = 0; i < 8; ++i ) {
+            detail::write32be( &digest[ i * 4 ], state_[ i ] );
+        }
+
+        return digest;
+    }
+};
+
+} // namespace boost
+} // namespace hash2
+
+#endif // #ifndef SHA2_HPP_INCLUDED

test/Jamfile

@@ -52,6 +52,7 @@ run xxhash.cpp ;
 run md5.cpp ;
 run hmac_md5.cpp ;
 run sha1.cpp ;
+run sha2.cpp ;
 run hmac_sha1.cpp ;
 run ripemd.cpp ;
 

test/sha2.cpp

@@ -0,0 +1,113 @@
+// Copyright 2024 Christian Mazakas.
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#define _CRT_SECURE_NO_WARNINGS
+
+#include <boost/hash2/sha2.hpp>
+#include <boost/core/lightweight_test.hpp>
+#include <cstdio>
+#include <string>
+#include <vector>
+
+template<std::size_t N> std::string to_string( std::array<unsigned char, N> const & v )
+{
+  std::string r;
+
+  for( std::size_t i = 0; i < N; ++i )
+  {
+		char buffer[ 4 ];
+		std::snprintf( buffer, sizeof( buffer ), "%02x", v[ i ] );
+		r += buffer;
+  }
+
+  return r;
+}
+
+template<class H> std::string digest( std::string const & s )
+{
+  H h;
+
+  h.update( s.data(), s.size() );
+
+  return to_string( h.result() );
+}
+
+template<class H, std::size_t N> std::string digest( char (&buf)[N])
+{
+  H h;
+
+  h.update( buf, N );
+
+  return to_string( h.result() );
+}
+
+template<class H> std::string digest( std::vector<char> const & v )
+{
+  H h;
+
+  h.update( v.data(), v.size() );
+
+  return to_string( h.result() );
+}
+
+using boost::hash2::sha2_256;
+
+int main()
+{
+
+    // https://en.wikipedia.org/wiki/SHA-2#Test_vectors
+
+    BOOST_TEST_EQ( digest<sha2_256>( "" ), std::string( "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855" ) );
+
+    // https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/SHA256.pdf
+
+    BOOST_TEST_EQ( digest<sha2_256>( "abc" ), std::string( "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad" ) );
+    BOOST_TEST_EQ( digest<sha2_256>( "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq" ), std::string( "248d6a61d20638b8e5c026930c3e6039a33ce45964ff2167f6ecedd419db06c1" ) );
+
+    // use test vectors from here
+    // https://csrc.nist.gov/CSRC/media/Projects/Cryptographic-Standards-and-Guidelines/documents/examples/SHA2_Additional.pdf
+
+    BOOST_TEST_EQ( digest<sha2_256>( "\xbd" ), std::string( "68325720aabd7c82f30f554b313d0570c95accbb7dc4b5aae11204c08ffe732b" ) );
+    BOOST_TEST_EQ( digest<sha2_256>( "\xc9\x8c\x8e\x55" ), std::string( "7abc22c0ae5af26ce93dbb94433a0e0b2e119d014f8e7f65bd56c61ccccd9504" ) );
+
+    {
+      char buf[ 55 ] = { 0 };
+      BOOST_TEST_EQ( digest<sha2_256>( buf ), std::string( "02779466cdec163811d078815c633f21901413081449002f24aa3e80f0b88ef7" ) );
+    }
+
+    {
+      char buf[ 56 ] = { 0 };
+      BOOST_TEST_EQ( digest<sha2_256>( buf ), std::string( "d4817aa5497628e7c77e6b606107042bbba3130888c5f47a375e6179be789fbb" ) );
+    }
+
+    {
+      char buf[ 64 ] = { 0 };
+      BOOST_TEST_EQ( digest<sha2_256>( buf ), std::string( "f5a5fd42d16a20302798ef6ed309979b43003d2320d9f0e8ea9831a92759fb4b" ) );
+    }
+
+    {
+      char buf[ 1000 ] = { 0 };
+      BOOST_TEST_EQ( digest<sha2_256>( buf ), std::string( "541b3e9daa09b20bf85fa273e5cbd3e80185aa4ec298e765db87742b70138a53" ) );
+    }
+
+    {
+      char buf[ 1000 ] = {};
+      for( auto& c : buf ) c = 'A';
+      BOOST_TEST_EQ( digest<sha2_256>( buf ), std::string( "c2e686823489ced2017f6059b8b239318b6364f6dcd835d0a519105a1eadd6e4" ) );
+    }
+
+    {
+      char buf[ 1005 ] = {};
+      for( auto& c : buf ) c = 'U';
+      BOOST_TEST_EQ( digest<sha2_256>( buf ), std::string( "f4d62ddec0f3dd90ea1380fa16a5ff8dc4c54b21740650f24afc4120903552b0" ) );
+    }
+
+    {
+      std::vector<char> buf(1000000, 0x00);
+      BOOST_TEST_EQ( digest<sha2_256>( buf ), std::string( "d29751f2649b32ff572b5e0a9f541ea660a50f94ff0beedfb0b692b924cc8025" ) );
+    }
+
+
+    return boost::report_errors();
+}