merge BLAKE3-c into this repo

This is commit 4476d9da0e370993823e7ad17592b84e905afd76 of
https://github.com/veorq/BLAKE3-c.

1 files changed, 97 insertions, 0 deletions

diff --git a/c/blake3_impl.h b/c/blake3_impl.h
new file mode 100644
index 0000000..576ccf4
--- /dev/null
+++ b/c/blake3_impl.h
@@ -0,0 +1,97 @@
+#pragma once
+
+#include <assert.h>
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+
+#if __POPCNT__
+#include <nmmintrin.h>
+#endif
+
+#include "blake3.h"
+
+// internal flags
+#define CHUNK_START 1
+#define CHUNK_END 2
+#define PARENT 4
+#define ROOT 8
+#define KEYED_HASH 16
+#define DERIVE_KEY_CONTEXT 32
+#define DERIVE_KEY_MATERIAL 64
+
+// This C implementation tries to support recent versions of GCC, Clang, and
+// MSVC.
+#if defined(_MSC_VER)
+#define INLINE __forceinline static
+#else
+#define INLINE __attribute__((always_inline)) static inline
+#endif
+
+static const uint32_t IV[8] = {0x6A09E667UL, 0xBB67AE85UL, 0x3C6EF372UL,
+                               0xA54FF53AUL, 0x510E527FUL, 0x9B05688CUL,
+                               0x1F83D9ABUL, 0x5BE0CD19UL};
+
+static const uint8_t MSG_SCHEDULE[7][16] = {
+    {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15},
+    {2, 6, 3, 10, 7, 0, 4, 13, 1, 11, 12, 5, 9, 14, 15, 8},
+    {3, 4, 10, 12, 13, 2, 7, 14, 6, 5, 9, 0, 11, 15, 8, 1},
+    {10, 7, 12, 9, 14, 3, 13, 15, 4, 0, 11, 2, 5, 8, 1, 6},
+    {12, 13, 9, 11, 15, 10, 14, 8, 7, 2, 5, 3, 0, 1, 6, 4},
+    {9, 14, 11, 5, 8, 12, 15, 1, 13, 3, 0, 10, 2, 6, 4, 7},
+    {11, 15, 5, 0, 1, 9, 8, 6, 14, 10, 2, 12, 3, 4, 7, 13},
+};
+
+// Count the number of 1 bits.
+INLINE uint8_t popcnt(uint64_t x) {
+#if __POPCNT__
+  return (uint8_t)_mm_popcnt_u64(x);
+#else
+  uint8_t count = 0;
+  while (x > 0) {
+    count += ((uint8_t)x) & 1;
+    x >>= 1;
+  }
+  return count;
+#endif
+}
+
+INLINE uint32_t counter_low(uint64_t counter) { return (uint32_t)counter; }
+
+INLINE uint32_t counter_high(uint64_t counter) {
+  return (uint32_t)(counter >> 32);
+}
+
+INLINE uint32_t load32(const void *src) {
+  const uint8_t *p = (const uint8_t *)src;
+  return ((uint32_t)(p[0]) << 0) | ((uint32_t)(p[1]) << 8) |
+         ((uint32_t)(p[2]) << 16) | ((uint32_t)(p[3]) << 24);
+}
+
+INLINE void load_key_words(const uint8_t key[BLAKE3_KEY_LEN],
+                           uint32_t key_words[8]) {
+  key_words[0] = load32(&key[0 * 4]);
+  key_words[1] = load32(&key[1 * 4]);
+  key_words[2] = load32(&key[2 * 4]);
+  key_words[3] = load32(&key[3 * 4]);
+  key_words[4] = load32(&key[4 * 4]);
+  key_words[5] = load32(&key[5 * 4]);
+  key_words[6] = load32(&key[6 * 4]);
+  key_words[7] = load32(&key[7 * 4]);
+}
+
+void blake3_compress_in_place(uint32_t cv[8],
+                              const uint8_t block[BLAKE3_BLOCK_LEN],
+                              uint8_t block_len, uint64_t counter,
+                              uint8_t flags);
+
+void blake3_compress_xof(const uint32_t cv[8],
+                         const uint8_t block[BLAKE3_BLOCK_LEN],
+                         uint8_t block_len, uint64_t counter, uint8_t flags,
+                         uint8_t out[64]);
+
+void blake3_hash_many(const uint8_t *const *inputs, size_t num_inputs,
+                      size_t blocks, const uint32_t key[8], uint64_t counter,
+                      bool increment_counter, uint8_t flags,
+                      uint8_t flags_start, uint8_t flags_end, uint8_t *out);