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blake3_impl.h
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blake3_impl.h
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#ifndef BLAKE3_IMPL_H
#define BLAKE3_IMPL_H
#include <assert.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <string.h>
#include "blake3.h"
// internal flags
enum blake3_flags {
CHUNK_START = 1 << 0,
CHUNK_END = 1 << 1,
PARENT = 1 << 2,
ROOT = 1 << 3,
KEYED_HASH = 1 << 4,
DERIVE_KEY_CONTEXT = 1 << 5,
DERIVE_KEY_MATERIAL = 1 << 6,
};
// This C implementation tries to support recent versions of GCC, Clang, and
// MSVC.
#if defined(_MSC_VER)
#define INLINE static __forceinline
#else
#define INLINE static inline __attribute__((always_inline))
#endif
#if (defined(__x86_64__) || defined(_M_X64)) && !defined(_M_ARM64EC)
#define IS_X86
#define IS_X86_64
#endif
#if defined(__i386__) || defined(_M_IX86)
#define IS_X86
#define IS_X86_32
#endif
#if defined(__aarch64__) || defined(_M_ARM64) || defined(_M_ARM64EC)
#define IS_AARCH64
#endif
#if defined(IS_X86)
#if defined(_MSC_VER)
#include <intrin.h>
#endif
#endif
#if !defined(BLAKE3_USE_NEON)
// If BLAKE3_USE_NEON not manually set, autodetect based on AArch64ness
#if defined(IS_AARCH64)
#if defined(__ARM_BIG_ENDIAN)
#define BLAKE3_USE_NEON 0
#else
#define BLAKE3_USE_NEON 1
#endif
#else
#define BLAKE3_USE_NEON 0
#endif
#endif
#if defined(IS_X86)
#define MAX_SIMD_DEGREE 16
#elif BLAKE3_USE_NEON == 1
#define MAX_SIMD_DEGREE 4
#else
#define MAX_SIMD_DEGREE 1
#endif
// There are some places where we want a static size that's equal to the
// MAX_SIMD_DEGREE, but also at least 2.
#define MAX_SIMD_DEGREE_OR_2 (MAX_SIMD_DEGREE > 2 ? MAX_SIMD_DEGREE : 2)
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},
};
/* Find index of the highest set bit */
/* x is assumed to be nonzero. */
static unsigned int highest_one(uint64_t x) {
#if defined(__GNUC__) || defined(__clang__)
return 63 ^ (unsigned int)__builtin_clzll(x);
#elif defined(_MSC_VER) && defined(IS_X86_64)
unsigned long index;
_BitScanReverse64(&index, x);
return index;
#elif defined(_MSC_VER) && defined(IS_X86_32)
if(x >> 32) {
unsigned long index;
_BitScanReverse(&index, (unsigned long)(x >> 32));
return 32 + index;
} else {
unsigned long index;
_BitScanReverse(&index, (unsigned long)x);
return index;
}
#else
unsigned int c = 0;
if(x & 0xffffffff00000000ULL) { x >>= 32; c += 32; }
if(x & 0x00000000ffff0000ULL) { x >>= 16; c += 16; }
if(x & 0x000000000000ff00ULL) { x >>= 8; c += 8; }
if(x & 0x00000000000000f0ULL) { x >>= 4; c += 4; }
if(x & 0x000000000000000cULL) { x >>= 2; c += 2; }
if(x & 0x0000000000000002ULL) { c += 1; }
return c;
#endif
}
// Count the number of 1 bits.
INLINE unsigned int popcnt(uint64_t x) {
#if defined(__GNUC__) || defined(__clang__)
return (unsigned int)__builtin_popcountll(x);
#else
unsigned int count = 0;
while (x != 0) {
count += 1;
x &= x - 1;
}
return count;
#endif
}
// Largest power of two less than or equal to x. As a special case, returns 1
// when x is 0.
INLINE uint64_t round_down_to_power_of_2(uint64_t x) {
return 1ULL << highest_one(x | 1);
}
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]);
}
INLINE void store32(void *dst, uint32_t w) {
uint8_t *p = (uint8_t *)dst;
p[0] = (uint8_t)(w >> 0);
p[1] = (uint8_t)(w >> 8);
p[2] = (uint8_t)(w >> 16);
p[3] = (uint8_t)(w >> 24);
}
INLINE void store_cv_words(uint8_t bytes_out[32], uint32_t cv_words[8]) {
store32(&bytes_out[0 * 4], cv_words[0]);
store32(&bytes_out[1 * 4], cv_words[1]);
store32(&bytes_out[2 * 4], cv_words[2]);
store32(&bytes_out[3 * 4], cv_words[3]);
store32(&bytes_out[4 * 4], cv_words[4]);
store32(&bytes_out[5 * 4], cv_words[5]);
store32(&bytes_out[6 * 4], cv_words[6]);
store32(&bytes_out[7 * 4], cv_words[7]);
}
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);
size_t blake3_simd_degree(void);
// Declarations for implementation-specific functions.
void blake3_compress_in_place_portable(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_portable(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_portable(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);
#if defined(IS_X86)
#if !defined(BLAKE3_NO_SSE2)
void blake3_compress_in_place_sse2(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_sse2(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_sse2(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);
#endif
#if !defined(BLAKE3_NO_SSE41)
void blake3_compress_in_place_sse41(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_sse41(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_sse41(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);
#endif
#if !defined(BLAKE3_NO_AVX2)
void blake3_hash_many_avx2(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);
#endif
#if !defined(BLAKE3_NO_AVX512)
void blake3_compress_in_place_avx512(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_avx512(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_avx512(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);
#endif
#endif
#if BLAKE3_USE_NEON == 1
void blake3_hash_many_neon(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);
#endif
#endif /* BLAKE3_IMPL_H */