#include "blake3_impl.h" #if BLAKE3_USE_NEON #include <arm_neon.h> #ifdef __ARM_BIG_ENDIAN #error "This implementation only supports little-endian ARM." // It might be that all we need for big-endian support here is to get the loads // and stores right, but step zero would be finding a way to test it in CI. #endif INLINE uint32x4_t loadu_128(const uint8_t src[16]) { // vld1q_u32 has alignment requirements. Don't use it. uint32x4_t x; memcpy(&x, src, 16); return x; } INLINE void storeu_128(uint32x4_t src, uint8_t dest[16]) { // vst1q_u32 has alignment requirements. Don't use it. memcpy(dest, &src, 16); } INLINE uint32x4_t add_128(uint32x4_t a, uint32x4_t b) { return vaddq_u32(a, b); } INLINE uint32x4_t xor_128(uint32x4_t a, uint32x4_t b) { return veorq_u32(a, b); } INLINE uint32x4_t set1_128(uint32_t x) { return vld1q_dup_u32(&x); } INLINE uint32x4_t set4(uint32_t a, uint32_t b, uint32_t c, uint32_t d) { uint32_t array[4] = {a, b, c, d}; return vld1q_u32(array); } INLINE uint32x4_t rot16_128(uint32x4_t x) { return vorrq_u32(vshrq_n_u32(x, 16), vshlq_n_u32(x, 32 - 16)); } INLINE uint32x4_t rot12_128(uint32x4_t x) { return vorrq_u32(vshrq_n_u32(x, 12), vshlq_n_u32(x, 32 - 12)); } INLINE uint32x4_t rot8_128(uint32x4_t x) { return vorrq_u32(vshrq_n_u32(x, 8), vshlq_n_u32(x, 32 - 8)); } INLINE uint32x4_t rot7_128(uint32x4_t x) { return vorrq_u32(vshrq_n_u32(x, 7), vshlq_n_u32(x, 32 - 7)); } // TODO: compress_neon // TODO: hash2_neon /* * ---------------------------------------------------------------------------- * hash4_neon * ---------------------------------------------------------------------------- */ INLINE void round_fn4(uint32x4_t v[16], uint32x4_t m[16], size_t r) { v[0] = add_128(v[0], m[(size_t)MSG_SCHEDULE[r][0]]); v[1] = add_128(v[1], m[(size_t)MSG_SCHEDULE[r][2]]); v[2] = add_128(v[2], m[(size_t)MSG_SCHEDULE[r][4]]); v[3] = add_128(v[3], m[(size_t)MSG_SCHEDULE[r][6]]); v[0] = add_128(v[0], v[4]); v[1] = add_128(v[1], v[5]); v[2] = add_128(v[2], v[6]); v[3] = add_128(v[3], v[7]); v[12] = xor_128(v[12], v[0]); v[13] = xor_128(v[13], v[1]); v[14] = xor_128(v[14], v[2]); v[15] = xor_128(v[15], v[3]); v[12] = rot16_128(v[12]); v[13] = rot16_128(v[13]); v[14] = rot16_128(v[14]); v[15] = rot16_128(v[15]); v[8] = add_128(v[8], v[12]); v[9] = add_128(v[9], v[13]); v[10] = add_128(v[10], v[14]); v[11] = add_128(v[11], v[15]); v[4] = xor_128(v[4], v[8]); v[5] = xor_128(v[5], v[9]); v[6] = xor_128(v[6], v[10]); v[7] = xor_128(v[7], v[11]); v[4] = rot12_128(v[4]); v[5] = rot12_128(v[5]); v[6] = rot12_128(v[6]); v[7] = rot12_128(v[7]); v[0] = add_128(v[0], m[(size_t)MSG_SCHEDULE[r][1]]); v[1] = add_128(v[1], m[(size_t)MSG_SCHEDULE[r][3]]); v[2] = add_128(v[2], m[(size_t)MSG_SCHEDULE[r][5]]); v[3] = add_128(v[3], m[(size_t)MSG_SCHEDULE[r][7]]); v[0] = add_128(v[0], v[4]); v[1] = add_128(v[1], v[5]); v[2] = add_128(v[2], v[6]); v[3] = add_128(v[3], v[7]); v[12] = xor_128(v[12], v[0]); v[13] = xor_128(v[13], v[1]); v[14] = xor_128(v[14], v[2]); v[15] = xor_128(v[15], v[3]); v[12] = rot8_128(v[12]); v[13] = rot8_128(v[13]); v[14] = rot8_128(v[14]); v[15] = rot8_128(v[15]); v[8] = add_128(v[8], v[12]); v[9] = add_128(v[9], v[13]); v[10] = add_128(v[10], v[14]); v[11] = add_128(v[11], v[15]); v[4] = xor_128(v[4], v[8]); v[5] = xor_128(v[5], v[9]); v[6] = xor_128(v[6], v[10]); v[7] = xor_128(v[7], v[11]); v[4] = rot7_128(v[4]); v[5] = rot7_128(v[5]); v[6] = rot7_128(v[6]); v[7] = rot7_128(v[7]); v[0] = add_128(v[0], m[(size_t)MSG_SCHEDULE[r][8]]); v[1] = add_128(v[1], m[(size_t)MSG_SCHEDULE[r][10]]); v[2] = add_128(v[2], m[(size_t)MSG_SCHEDULE[r][12]]); v[3] = add_128(v[3], m[(size_t)MSG_SCHEDULE[r][14]]); v[0] = add_128(v[0], v[5]); v[1] = add_128(v[1], v[6]); v[2] = add_128(v[2], v[7]); v[3] = add_128(v[3], v[4]); v[15] = xor_128(v[15], v[0]); v[12] = xor_128(v[12], v[1]); v[13] = xor_128(v[13], v[2]); v[14] = xor_128(v[14], v[3]); v[15] = rot16_128(v[15]); v[12] = rot16_128(v[12]); v[13] = rot16_128(v[13]); v[14] = rot16_128(v[14]); v[10] = add_128(v[10], v[15]); v[11] = add_128(v[11], v[12]); v[8] = add_128(v[8], v[13]); v[9] = add_128(v[9], v[14]); v[5] = xor_128(v[5], v[10]); v[6] = xor_128(v[6], v[11]); v[7] = xor_128(v[7], v[8]); v[4] = xor_128(v[4], v[9]); v[5] = rot12_128(v[5]); v[6] = rot12_128(v[6]); v[7] = rot12_128(v[7]); v[4] = rot12_128(v[4]); v[0] = add_128(v[0], m[(size_t)MSG_SCHEDULE[r][9]]); v[1] = add_128(v[1], m[(size_t)MSG_SCHEDULE[r][11]]); v[2] = add_128(v[2], m[(size_t)MSG_SCHEDULE[r][13]]); v[3] = add_128(v[3], m[(size_t)MSG_SCHEDULE[r][15]]); v[0] = add_128(v[0], v[5]); v[1] = add_128(v[1], v[6]); v[2] = add_128(v[2], v[7]); v[3] = add_128(v[3], v[4]); v[15] = xor_128(v[15], v[0]); v[12] = xor_128(v[12], v[1]); v[13] = xor_128(v[13], v[2]); v[14] = xor_128(v[14], v[3]); v[15] = rot8_128(v[15]); v[12] = rot8_128(v[12]); v[13] = rot8_128(v[13]); v[14] = rot8_128(v[14]); v[10] = add_128(v[10], v[15]); v[11] = add_128(v[11], v[12]); v[8] = add_128(v[8], v[13]); v[9] = add_128(v[9], v[14]); v[5] = xor_128(v[5], v[10]); v[6] = xor_128(v[6], v[11]); v[7] = xor_128(v[7], v[8]); v[4] = xor_128(v[4], v[9]); v[5] = rot7_128(v[5]); v[6] = rot7_128(v[6]); v[7] = rot7_128(v[7]); v[4] = rot7_128(v[4]); } INLINE void transpose_vecs_128(uint32x4_t vecs[4]) { // Individually transpose the four 2x2 sub-matrices in each corner. uint32x4x2_t rows01 = vtrnq_u32(vecs[0], vecs[1]); uint32x4x2_t rows23 = vtrnq_u32(vecs[2], vecs[3]); // Swap the top-right and bottom-left 2x2s (which just got transposed). vecs[0] = vcombine_u32(vget_low_u32(rows01.val[0]), vget_low_u32(rows23.val[0])); vecs[1] = vcombine_u32(vget_low_u32(rows01.val[1]), vget_low_u32(rows23.val[1])); vecs[2] = vcombine_u32(vget_high_u32(rows01.val[0]), vget_high_u32(rows23.val[0])); vecs[3] = vcombine_u32(vget_high_u32(rows01.val[1]), vget_high_u32(rows23.val[1])); } INLINE void transpose_msg_vecs4(const uint8_t *const *inputs, size_t block_offset, uint32x4_t out[16]) { out[0] = loadu_128(&inputs[0][block_offset + 0 * sizeof(uint32x4_t)]); out[1] = loadu_128(&inputs[1][block_offset + 0 * sizeof(uint32x4_t)]); out[2] = loadu_128(&inputs[2][block_offset + 0 * sizeof(uint32x4_t)]); out[3] = loadu_128(&inputs[3][block_offset + 0 * sizeof(uint32x4_t)]); out[4] = loadu_128(&inputs[0][block_offset + 1 * sizeof(uint32x4_t)]); out[5] = loadu_128(&inputs[1][block_offset + 1 * sizeof(uint32x4_t)]); out[6] = loadu_128(&inputs[2][block_offset + 1 * sizeof(uint32x4_t)]); out[7] = loadu_128(&inputs[3][block_offset + 1 * sizeof(uint32x4_t)]); out[8] = loadu_128(&inputs[0][block_offset + 2 * sizeof(uint32x4_t)]); out[9] = loadu_128(&inputs[1][block_offset + 2 * sizeof(uint32x4_t)]); out[10] = loadu_128(&inputs[2][block_offset + 2 * sizeof(uint32x4_t)]); out[11] = loadu_128(&inputs[3][block_offset + 2 * sizeof(uint32x4_t)]); out[12] = loadu_128(&inputs[0][block_offset + 3 * sizeof(uint32x4_t)]); out[13] = loadu_128(&inputs[1][block_offset + 3 * sizeof(uint32x4_t)]); out[14] = loadu_128(&inputs[2][block_offset + 3 * sizeof(uint32x4_t)]); out[15] = loadu_128(&inputs[3][block_offset + 3 * sizeof(uint32x4_t)]); transpose_vecs_128(&out[0]); transpose_vecs_128(&out[4]); transpose_vecs_128(&out[8]); transpose_vecs_128(&out[12]); } INLINE void load_counters4(uint64_t counter, bool increment_counter, uint32x4_t *out_low, uint32x4_t *out_high) { uint64_t mask = (increment_counter ? ~0 : 0); *out_low = set4( counter_low(counter + (mask & 0)), counter_low(counter + (mask & 1)), counter_low(counter + (mask & 2)), counter_low(counter + (mask & 3))); *out_high = set4( counter_high(counter + (mask & 0)), counter_high(counter + (mask & 1)), counter_high(counter + (mask & 2)), counter_high(counter + (mask & 3))); } static void blake3_hash4_neon(const uint8_t *const *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) { uint32x4_t h_vecs[8] = { set1_128(key[0]), set1_128(key[1]), set1_128(key[2]), set1_128(key[3]), set1_128(key[4]), set1_128(key[5]), set1_128(key[6]), set1_128(key[7]), }; uint32x4_t counter_low_vec, counter_high_vec; load_counters4(counter, increment_counter, &counter_low_vec, &counter_high_vec); uint8_t block_flags = flags | flags_start; for (size_t block = 0; block < blocks; block++) { if (block + 1 == blocks) { block_flags |= flags_end; } uint32x4_t block_len_vec = set1_128(BLAKE3_BLOCK_LEN); uint32x4_t block_flags_vec = set1_128(block_flags); uint32x4_t msg_vecs[16]; transpose_msg_vecs4(inputs, block * BLAKE3_BLOCK_LEN, msg_vecs); uint32x4_t v[16] = { h_vecs[0], h_vecs[1], h_vecs[2], h_vecs[3], h_vecs[4], h_vecs[5], h_vecs[6], h_vecs[7], set1_128(IV[0]), set1_128(IV[1]), set1_128(IV[2]), set1_128(IV[3]), counter_low_vec, counter_high_vec, block_len_vec, block_flags_vec, }; round_fn4(v, msg_vecs, 0); round_fn4(v, msg_vecs, 1); round_fn4(v, msg_vecs, 2); round_fn4(v, msg_vecs, 3); round_fn4(v, msg_vecs, 4); round_fn4(v, msg_vecs, 5); round_fn4(v, msg_vecs, 6); h_vecs[0] = xor_128(v[0], v[8]); h_vecs[1] = xor_128(v[1], v[9]); h_vecs[2] = xor_128(v[2], v[10]); h_vecs[3] = xor_128(v[3], v[11]); h_vecs[4] = xor_128(v[4], v[12]); h_vecs[5] = xor_128(v[5], v[13]); h_vecs[6] = xor_128(v[6], v[14]); h_vecs[7] = xor_128(v[7], v[15]); block_flags = flags; } transpose_vecs_128(&h_vecs[0]); transpose_vecs_128(&h_vecs[4]); // The first four vecs now contain the first half of each output, and the // second four vecs contain the second half of each output. storeu_128(h_vecs[0], &out[0 * sizeof(uint32x4_t)]); storeu_128(h_vecs[4], &out[1 * sizeof(uint32x4_t)]); storeu_128(h_vecs[1], &out[2 * sizeof(uint32x4_t)]); storeu_128(h_vecs[5], &out[3 * sizeof(uint32x4_t)]); storeu_128(h_vecs[2], &out[4 * sizeof(uint32x4_t)]); storeu_128(h_vecs[6], &out[5 * sizeof(uint32x4_t)]); storeu_128(h_vecs[3], &out[6 * sizeof(uint32x4_t)]); storeu_128(h_vecs[7], &out[7 * sizeof(uint32x4_t)]); } /* * ---------------------------------------------------------------------------- * hash_many_neon * ---------------------------------------------------------------------------- */ 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); INLINE void hash_one_neon(const uint8_t *input, size_t blocks, const uint32_t key[8], uint64_t counter, uint8_t flags, uint8_t flags_start, uint8_t flags_end, uint8_t out[BLAKE3_OUT_LEN]) { uint32_t cv[8]; memcpy(cv, key, BLAKE3_KEY_LEN); uint8_t block_flags = flags | flags_start; while (blocks > 0) { if (blocks == 1) { block_flags |= flags_end; } // TODO: Implement compress_neon. However note that according to // https://github.com/BLAKE2/BLAKE2/commit/7965d3e6e1b4193438b8d3a656787587d2579227, // compress_neon might not be any faster than compress_portable. blake3_compress_in_place_portable(cv, input, BLAKE3_BLOCK_LEN, counter, block_flags); input = &input[BLAKE3_BLOCK_LEN]; blocks -= 1; block_flags = flags; } memcpy(out, cv, BLAKE3_OUT_LEN); } 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) { while (num_inputs >= 4) { blake3_hash4_neon(inputs, blocks, key, counter, increment_counter, flags, flags_start, flags_end, out); if (increment_counter) { counter += 4; } inputs += 4; num_inputs -= 4; out = &out[4 * BLAKE3_OUT_LEN]; } while (num_inputs > 0) { hash_one_neon(inputs[0], blocks, key, counter, flags, flags_start, flags_end, out); if (increment_counter) { counter += 1; } inputs += 1; num_inputs -= 1; out = &out[BLAKE3_OUT_LEN]; } } #endif // BLAKE3_USE_NEON
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