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blake3_portable.c
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#include "blake3_impl.h"
#include <string.h>
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 uint32_t rotr32(uint32_t w, uint32_t c) {
return (w >> c) | (w << (32 - c));
}
INLINE void g(uint32_t *state, size_t a, size_t b, size_t c, size_t d,
uint32_t x, uint32_t y) {
state[a] = state[a] + state[b] + x;
state[d] = rotr32(state[d] ^ state[a], 16);
state[c] = state[c] + state[d];
state[b] = rotr32(state[b] ^ state[c], 12);
state[a] = state[a] + state[b] + y;
state[d] = rotr32(state[d] ^ state[a], 8);
state[c] = state[c] + state[d];
state[b] = rotr32(state[b] ^ state[c], 7);
}
INLINE void round_fn(uint32_t state[16], const uint32_t *msg, size_t round) {
// Select the message schedule based on the round.
const uint8_t *schedule = MSG_SCHEDULE[round];
// Mix the columns.
g(state, 0, 4, 8, 12, msg[schedule[0]], msg[schedule[1]]);
g(state, 1, 5, 9, 13, msg[schedule[2]], msg[schedule[3]]);
g(state, 2, 6, 10, 14, msg[schedule[4]], msg[schedule[5]]);
g(state, 3, 7, 11, 15, msg[schedule[6]], msg[schedule[7]]);
// Mix the rows.
g(state, 0, 5, 10, 15, msg[schedule[8]], msg[schedule[9]]);
g(state, 1, 6, 11, 12, msg[schedule[10]], msg[schedule[11]]);
g(state, 2, 7, 8, 13, msg[schedule[12]], msg[schedule[13]]);
g(state, 3, 4, 9, 14, msg[schedule[14]], msg[schedule[15]]);
}
INLINE void compress_pre(uint32_t state[16], const uint32_t cv[8],
const uint8_t block[BLAKE3_BLOCK_LEN],
uint8_t block_len, uint64_t counter, uint8_t flags) {
uint32_t block_words[16];
block_words[0] = load32(block + 4 * 0);
block_words[1] = load32(block + 4 * 1);
block_words[2] = load32(block + 4 * 2);
block_words[3] = load32(block + 4 * 3);
block_words[4] = load32(block + 4 * 4);
block_words[5] = load32(block + 4 * 5);
block_words[6] = load32(block + 4 * 6);
block_words[7] = load32(block + 4 * 7);
block_words[8] = load32(block + 4 * 8);
block_words[9] = load32(block + 4 * 9);
block_words[10] = load32(block + 4 * 10);
block_words[11] = load32(block + 4 * 11);
block_words[12] = load32(block + 4 * 12);
block_words[13] = load32(block + 4 * 13);
block_words[14] = load32(block + 4 * 14);
block_words[15] = load32(block + 4 * 15);
state[0] = cv[0];
state[1] = cv[1];
state[2] = cv[2];
state[3] = cv[3];
state[4] = cv[4];
state[5] = cv[5];
state[6] = cv[6];
state[7] = cv[7];
state[8] = IV[0];
state[9] = IV[1];
state[10] = IV[2];
state[11] = IV[3];
state[12] = counter_low(counter);
state[13] = counter_high(counter);
state[14] = (uint32_t)block_len;
state[15] = (uint32_t)flags;
round_fn(state, &block_words[0], 0);
round_fn(state, &block_words[0], 1);
round_fn(state, &block_words[0], 2);
round_fn(state, &block_words[0], 3);
round_fn(state, &block_words[0], 4);
round_fn(state, &block_words[0], 5);
round_fn(state, &block_words[0], 6);
}
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) {
uint32_t state[16];
compress_pre(state, cv, block, block_len, counter, flags);
cv[0] = state[0] ^ state[8];
cv[1] = state[1] ^ state[9];
cv[2] = state[2] ^ state[10];
cv[3] = state[3] ^ state[11];
cv[4] = state[4] ^ state[12];
cv[5] = state[5] ^ state[13];
cv[6] = state[6] ^ state[14];
cv[7] = state[7] ^ state[15];
}
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]) {
uint32_t state[16];
compress_pre(state, cv, block, block_len, counter, flags);
store32(&out[0 * 4], state[0] ^ state[8]);
store32(&out[1 * 4], state[1] ^ state[9]);
store32(&out[2 * 4], state[2] ^ state[10]);
store32(&out[3 * 4], state[3] ^ state[11]);
store32(&out[4 * 4], state[4] ^ state[12]);
store32(&out[5 * 4], state[5] ^ state[13]);
store32(&out[6 * 4], state[6] ^ state[14]);
store32(&out[7 * 4], state[7] ^ state[15]);
store32(&out[8 * 4], state[8] ^ cv[0]);
store32(&out[9 * 4], state[9] ^ cv[1]);
store32(&out[10 * 4], state[10] ^ cv[2]);
store32(&out[11 * 4], state[11] ^ cv[3]);
store32(&out[12 * 4], state[12] ^ cv[4]);
store32(&out[13 * 4], state[13] ^ cv[5]);
store32(&out[14 * 4], state[14] ^ cv[6]);
store32(&out[15 * 4], state[15] ^ cv[7]);
}
INLINE void hash_one_portable(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;
}
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, 32);
}
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) {
while (num_inputs > 0) {
hash_one_portable(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];
}
}