diff --git a/include/bitcoin/system/hash/sha/algorithm.hpp b/include/bitcoin/system/hash/sha/algorithm.hpp
index 4ccf039c92..400460b5c8 100644
--- a/include/bitcoin/system/hash/sha/algorithm.hpp
+++ b/include/bitcoin/system/hash/sha/algorithm.hpp
@@ -236,13 +236,17 @@ class algorithm
     /// -----------------------------------------------------------------------
 
     INLINE static constexpr void input(buffer_t& buffer, const block_t& block) NOEXCEPT;
-    INLINE static constexpr void input_left(auto& buffer, const quart_t& quarter) NOEXCEPT;
-    INLINE static constexpr void input_right(auto& buffer, const quart_t& quarter) NOEXCEPT;
+    INLINE static constexpr digest_t output(const state_t& state) NOEXCEPT;
+
     INLINE static constexpr void input_left(auto& buffer, const half_t& half) NOEXCEPT;
     INLINE static constexpr void input_right(auto& buffer, const half_t& half) NOEXCEPT;
-    INLINE static constexpr void inject_left(auto& buffer, const auto& left) NOEXCEPT;
-    INLINE static constexpr void inject_right(auto& buffer, const auto& right) NOEXCEPT;
-    INLINE static constexpr digest_t output(const state_t& state) NOEXCEPT;
+    INLINE static constexpr void input_left(auto& buffer, const quart_t& quarter) NOEXCEPT;
+    INLINE static constexpr void input_right(auto& buffer, const quart_t& quarter) NOEXCEPT;
+
+    INLINE static constexpr void inject_left_half(auto& buffer, const auto& left) NOEXCEPT;
+    INLINE static constexpr void inject_right_half(auto& buffer, const auto& right) NOEXCEPT;
+    INLINE static constexpr void inject_left_quarter(auto& buffer, const auto& left) NOEXCEPT;
+    INLINE static constexpr void inject_right_quarter(auto& buffer, const auto& right) NOEXCEPT;
 
     /// Padding.
     /// -----------------------------------------------------------------------
@@ -409,6 +413,7 @@ class algorithm
     static digest_t native_hash(const block_t& block) NOEXCEPT;
     static digest_t native_hash(const half_t& half) NOEXCEPT;
     static digest_t native_hash(const half_t& left, const half_t& right) NOEXCEPT;
+    static digest_t native_hash(const quart_t& left, const quart_t& right) NOEXCEPT;
     static digest_t native_hash(uint8_t byte) NOEXCEPT;
 
     static digest_t native_double_hash(const block_t& block) NOEXCEPT;
diff --git a/include/bitcoin/system/impl/hash/sha/algorithm_double.ipp b/include/bitcoin/system/impl/hash/sha/algorithm_double.ipp
index 2f8dd963a9..b9b6232f63 100644
--- a/include/bitcoin/system/impl/hash/sha/algorithm_double.ipp
+++ b/include/bitcoin/system/impl/hash/sha/algorithm_double.ipp
@@ -95,7 +95,7 @@ double_hash(const block_t& block) NOEXCEPT
         compress(state, buffer);
 
         // Second hash
-        inject_left(buffer, state);
+        inject_left_half(buffer, state);
         pad_half(buffer);
         schedule(buffer);
         state = H::get;
@@ -134,7 +134,7 @@ double_hash(const half_t& half) NOEXCEPT
         compress(state, buffer);
 
         // Second hash
-        inject_left(buffer, state);
+        inject_left_half(buffer, state);
         pad_half(buffer);
         schedule(buffer);
         state = H::get;
@@ -175,7 +175,7 @@ double_hash(const half_t& left, const half_t& right) NOEXCEPT
         compress(state, buffer);
 
         // Second hash
-        inject_left(buffer, state);
+        inject_left_half(buffer, state);
         pad_half(buffer);
         schedule(buffer);
         state = H::get;
diff --git a/include/bitcoin/system/impl/hash/sha/algorithm_merkle.ipp b/include/bitcoin/system/impl/hash/sha/algorithm_merkle.ipp
index ce3bf97f9c..6df45eee13 100644
--- a/include/bitcoin/system/impl/hash/sha/algorithm_merkle.ipp
+++ b/include/bitcoin/system/impl/hash/sha/algorithm_merkle.ipp
@@ -372,7 +372,7 @@ merkle_hash_vector(idigests_t& digests, iblocks_t& blocks) NOEXCEPT
                 compress_(xstate, xbuffer);
 
                 // Second hash
-                inject_left(xbuffer, xstate);
+                inject_left_half(xbuffer, xstate);
                 pad_half(xbuffer);
                 schedule_(xbuffer);
                 xstate = initial;
diff --git a/include/bitcoin/system/impl/hash/sha/algorithm_native.ipp b/include/bitcoin/system/impl/hash/sha/algorithm_native.ipp
index 346969dc5e..e5ffb5d895 100644
--- a/include/bitcoin/system/impl/hash/sha/algorithm_native.ipp
+++ b/include/bitcoin/system/impl/hash/sha/algorithm_native.ipp
@@ -268,11 +268,10 @@ native_finalize(state_t& state, const words_t& pad) NOEXCEPT
     unshuffle(lo, hi);
 
     // digest is copied so that state remains valid (LE).
-    digest_t digest{};
-    auto& wdigest = array_cast<xint128_t>(digest);
+    std::array<xint128_t, 2> wdigest{};
     store(wdigest[0], byteswap<uint32_t>(lo));
     store(wdigest[1], byteswap<uint32_t>(hi));
-    return digest;
+    return array_cast<byte_t, sizeof(digest_t)>(wdigest);
 }
 
 TEMPLATE
@@ -285,7 +284,7 @@ native_finalize_second(const state_t& state) NOEXCEPT
     // Hash a state value and finalize it.
     auto state2 = H::get;
     words_t block{};
-    inject_left(block, state);
+    inject_left_half(block, state);
     pad_half(block);
     return native_finalize(state2, block);
 }
@@ -300,7 +299,7 @@ native_finalize_double(state_t& state, size_t blocks) NOEXCEPT
 
     // This is native_finalize_second() but reuses the initial block.
     auto state2 = H::get;
-    inject_left(block, state);
+    inject_left_half(block, state);
     pad_half(block);
     return native_finalize(state2, block);
 }
@@ -338,23 +337,38 @@ native_hash(const half_t& left, const half_t& right) NOEXCEPT
 {
     auto state = H::get;
     words_t block{};
-    inject_left(block, array_cast<word_t>(left));
-    inject_right(block, array_cast<word_t>(right));
+    inject_left_half(block, array_cast<word_t>(left));
+    inject_right_half(block, array_cast<word_t>(right));
     native_transform<true>(state, block);
     return native_finalize<one>(state);
 }
 
+TEMPLATE
+typename CLASS::digest_t CLASS::
+native_hash(const quart_t& left, const quart_t& right) NOEXCEPT
+{
+    auto state = H::get;
+    words_t block{};
+    inject_left_quarter(block, array_cast<word_t>(left));
+    inject_right_quarter(block, array_cast<word_t>(right));
+    pad_half(block);
+    return native_finalize(state, block);
+}
+
 TEMPLATE
 typename CLASS::digest_t CLASS::
 native_hash(uint8_t byte) NOEXCEPT
 {
     constexpr auto pad = bit_hi<uint8_t>;
 
+    auto state = H::get;
     block_t block{};
-    block.at(0) = byte;
-    block.at(1) = pad;
-    block.at(63) = byte_bits;
-    return native_hash(block);
+
+    // Order is based on array of little-endian uint32_t.
+    block.at(3) = byte;
+    block.at(2) = pad;
+    block.at(60) = byte_bits;
+    return native_finalize(state, array_cast<word_t>(block));
 }
 
 // Double hash functions start with BE data and end with BE digest_t.
@@ -370,7 +384,7 @@ native_double_hash(const block_t& block) NOEXCEPT
 
     // Second hash
     words_t block2{};
-    inject_left(block2, state);
+    inject_left_half(block2, state);
     pad_half(block2);
     state = H::get;
     return native_finalize(state, block2);
@@ -388,7 +402,7 @@ native_double_hash(const half_t& half) NOEXCEPT
     native_transform<false>(state, block);
 
     // Second hash
-    inject_left(block, state);
+    inject_left_half(block, state);
     pad_half(block);
     state = H::get;
     return native_finalize(state, block);
@@ -400,13 +414,13 @@ native_double_hash(const half_t& left, const half_t& right) NOEXCEPT
 {
     auto state = H::get;
     words_t block{};
-    inject_left(block, array_cast<word_t>(left));
-    inject_right(block, array_cast<word_t>(right));
+    inject_left_half(block, array_cast<word_t>(left));
+    inject_right_half(block, array_cast<word_t>(right));
     native_transform<true>(state, block);
     native_transform<false>(state, pad_block());
 
     // Second hash
-    inject_left(block, state);
+    inject_left_half(block, state);
     pad_half(block);
     state = H::get;
     return native_finalize(state, block);
diff --git a/include/bitcoin/system/impl/hash/sha/algorithm_parsing.ipp b/include/bitcoin/system/impl/hash/sha/algorithm_parsing.ipp
index 14ba84378d..6697e38053 100644
--- a/include/bitcoin/system/impl/hash/sha/algorithm_parsing.ipp
+++ b/include/bitcoin/system/impl/hash/sha/algorithm_parsing.ipp
@@ -410,11 +410,8 @@ output(const state_t& state) NOEXCEPT
 
 TEMPLATE
 INLINE constexpr void CLASS::
-inject_left(auto& buffer, const auto& left) NOEXCEPT
+inject_left_half(auto& buffer, const auto& left) NOEXCEPT
 {
-    using words = decltype(buffer);
-    static_assert(array_count<words> >= SHA::state_words);
-
     if (std::is_constant_evaluated())
     {
         buffer.at(0) = left.at(0);
@@ -428,18 +425,15 @@ inject_left(auto& buffer, const auto& left) NOEXCEPT
     }
     else
     {
-        using word = array_element<words>;
+        using word = array_element<decltype(buffer)>;
         array_cast<word, SHA::state_words>(buffer) = left;
     }
 }
 
 TEMPLATE
 INLINE constexpr void CLASS::
-inject_right(auto& buffer, const auto& right) NOEXCEPT
+inject_right_half(auto& buffer, const auto& right) NOEXCEPT
 {
-    using words = decltype(buffer);
-    static_assert(array_count<words> >= SHA::state_words);
-
     if (std::is_constant_evaluated())
     {
         buffer.at(8) = right.at(0);
@@ -453,11 +447,48 @@ inject_right(auto& buffer, const auto& right) NOEXCEPT
     }
     else
     {
-        using word = array_element<words>;
+        using word = array_element<decltype(buffer)>;
         array_cast<word, SHA::state_words, SHA::state_words>(buffer) = right;
     }
 }
 
+TEMPLATE
+INLINE constexpr void CLASS::
+inject_left_quarter(auto& buffer, const auto& left) NOEXCEPT
+{
+    if (std::is_constant_evaluated())
+    {
+        buffer.at(0) = left.at(0);
+        buffer.at(1) = left.at(1);
+        buffer.at(2) = left.at(2);
+        buffer.at(3) = left.at(3);
+    }
+    else
+    {
+        using word = array_element<decltype(buffer)>;
+        array_cast<word, to_half(SHA::state_words)>(buffer) = left;
+    }
+}
+
+TEMPLATE
+INLINE constexpr void CLASS::
+inject_right_quarter(auto& buffer, const auto& right) NOEXCEPT
+{
+    if (std::is_constant_evaluated())
+    {
+        buffer.at(4) = right.at(0);
+        buffer.at(5) = right.at(1);
+        buffer.at(6) = right.at(2);
+        buffer.at(7) = right.at(3);
+    }
+    else
+    {
+        using word = array_element<decltype(buffer)>;
+        constexpr auto words = to_half(SHA::state_words);
+        array_cast<word, words, words>(buffer) = right;
+    }
+}
+
 } // namespace sha
 } // namespace system
 } // namespace libbitcoin
diff --git a/include/bitcoin/system/impl/hash/sha/algorithm_stream.ipp b/include/bitcoin/system/impl/hash/sha/algorithm_stream.ipp
index bae2e7c0eb..8c027b5690 100644
--- a/include/bitcoin/system/impl/hash/sha/algorithm_stream.ipp
+++ b/include/bitcoin/system/impl/hash/sha/algorithm_stream.ipp
@@ -116,7 +116,7 @@ finalize_second(const state_t& state) NOEXCEPT
     {
         auto state2 = H::get;
         buffer_t buffer{};
-        inject_left(buffer, state);
+        inject_left_half(buffer, state);
         pad_half(buffer);
         schedule(buffer);
         compress(state2, buffer);
@@ -150,7 +150,7 @@ finalize_double(state_t& state, size_t blocks) NOEXCEPT
 
         // This is finalize_second() but reuses the initial buffer.
         auto state2 = H::get;
-        inject_left(buffer, state);
+        inject_left_half(buffer, state);
         pad_half(buffer);
         schedule(buffer);
         compress(state2, buffer);
diff --git a/test/hash/sha/sha256.cpp b/test/hash/sha/sha256.cpp
index ef0762b98d..c8c3a50368 100644
--- a/test/hash/sha/sha256.cpp
+++ b/test/hash/sha/sha256.cpp
@@ -155,7 +155,7 @@ BOOST_AUTO_TEST_CASE(sha256_224__ttt_accumulator_hash__test_vectors__expected)
     using sha_256_224 = sha::algorithm<sha::h256<224>, true, true, true>;
 
     // Native only for sha256 (and sha160 when implemented).
-    static_assert(!sha_256_224::native);
+    static_assert(sha_256_224::native == native);
     static_assert(sha_256_224::vector == vector);
     static_assert(sha_256_224::caching);