crypt: Implement blake2b hash function

This commit is contained in:
czapek1337 2022-09-11 18:48:27 +02:00
parent fe00a3c45d
commit 8906518cd2
No known key found for this signature in database
GPG Key ID: 2F5F3AE42F4E7E2C
2 changed files with 221 additions and 0 deletions

209
common/crypt/blake2b.c Normal file
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// This blake2b implementation comes from the GNU coreutils project.
// https://github.com/coreutils/coreutils/blob/master/src/blake2/blake2b-ref.c
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#include <crypt/blake2b.h>
#include <lib/libc.h>
#define BLAKE2B_BLOCK_BYTES 128
#define BLAKE2B_KEY_BYTES 64
#define BLAKE2B_SALT_BYTES 16
#define BLAKE2B_PERSONAL_BYTES 16
static const uint64_t blake2b_iv[8] = {
0x6a09e667f3bcc908,
0xbb67ae8584caa73b,
0x3c6ef372fe94f82b,
0xa54ff53a5f1d36f1,
0x510e527fade682d1,
0x9b05688c2b3e6c1f,
0x1f83d9abfb41bd6b,
0x5be0cd19137e2179,
};
static const uint8_t blake2b_sigma[12][16] = {
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
{ 11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4 },
{ 7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8 },
{ 9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13 },
{ 2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9 },
{ 12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11 },
{ 13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10 },
{ 6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5 },
{ 10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0 },
{ 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 },
{ 14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3 },
};
struct blake2b_state {
uint64_t h[8];
uint64_t t[2];
uint64_t f[2];
uint8_t buf[BLAKE2B_BLOCK_BYTES];
size_t buf_len;
uint8_t last_node;
};
struct blake2b_param {
uint8_t digest_length;
uint8_t key_length;
uint8_t fan_out;
uint8_t depth;
uint32_t leaf_length;
uint32_t node_offset;
uint32_t xof_length;
uint8_t node_depth;
uint8_t inner_length;
uint8_t reserved[14];
uint8_t salt[BLAKE2B_SALT_BYTES];
uint8_t personal[BLAKE2B_PERSONAL_BYTES];
} __attribute__((packed));
static void blake2b_increment_counter(struct blake2b_state *state, uint64_t inc) {
state->t[0] += inc;
state->t[1] += state->t[0] < inc;
}
static inline uint64_t rotr64(uint64_t w, unsigned c) {
return (w >> c) | (w << (64 - c));
}
#define G(r, i, a, b, c, d) do { \
a = a + b + m[blake2b_sigma[r][2 * i + 0]]; \
d = rotr64(d ^ a, 32); \
c = c + d; \
b = rotr64(b ^ c, 24); \
a = a + b + m[blake2b_sigma[r][2 * i + 1]]; \
d = rotr64(d ^ a, 16); \
c = c + d; \
b = rotr64(b ^ c, 63); \
} while (0)
#define ROUND(r) do { \
G(r, 0, v[0], v[4], v[8], v[12]); \
G(r, 1, v[1], v[5], v[9], v[13]); \
G(r, 2, v[2], v[6], v[10], v[14]); \
G(r, 3, v[3], v[7], v[11], v[15]); \
G(r, 4, v[0], v[5], v[10], v[15]); \
G(r, 5, v[1], v[6], v[11], v[12]); \
G(r, 6, v[2], v[7], v[8], v[13]); \
G(r, 7, v[3], v[4], v[9], v[14]); \
} while (0)
static void blake2b_compress(struct blake2b_state *state, const uint8_t block[static BLAKE2B_BLOCK_BYTES]) {
uint64_t m[16];
uint64_t v[16];
for (int i = 0; i < 16; i++) {
m[i] = *(uint64_t *)(block + i * sizeof(m[i]));
}
for (int i = 0; i < 8; i++) {
v[i] = state->h[i];
}
v[8] = blake2b_iv[0];
v[9] = blake2b_iv[1];
v[10] = blake2b_iv[2];
v[11] = blake2b_iv[3];
v[12] = blake2b_iv[4] ^ state->t[0];
v[13] = blake2b_iv[5] ^ state->t[1];
v[14] = blake2b_iv[6] ^ state->f[0];
v[15] = blake2b_iv[7] ^ state->f[1];
ROUND(0);
ROUND(1);
ROUND(2);
ROUND(3);
ROUND(4);
ROUND(5);
ROUND(6);
ROUND(7);
ROUND(8);
ROUND(9);
ROUND(10);
ROUND(11);
for (int i = 0; i < 8; i++) {
state->h[i] = state->h[i] ^ v[i] ^ v[i + 8];
}
}
#undef G
#undef ROUND
static void blake2b_init(struct blake2b_state *state) {
struct blake2b_param param = {0};
param.digest_length = BLAKE2B_OUT_BYTES;
param.fan_out = 1;
param.depth = 1;
memset(state, 0, sizeof(struct blake2b_state));
for (int i = 0; i < 8; i++) {
state->h[i] = blake2b_iv[i];
}
for (int i = 0; i < 8; i++) {
state->h[i] ^= *(uint64_t *)((void *)&param + sizeof(state->h[i]) * i);
}
}
static void blake2b_update(struct blake2b_state *state, const void *in, size_t in_len) {
if (in_len == 0) {
return;
}
size_t left = state->buf_len;
size_t fill = BLAKE2B_BLOCK_BYTES - left;
if (in_len > fill) {
state->buf_len = 0;
memcpy(state->buf + left, in, fill);
blake2b_increment_counter(state, BLAKE2B_BLOCK_BYTES);
blake2b_compress(state, state->buf);
in += fill;
in_len -= fill;
while (in_len > BLAKE2B_BLOCK_BYTES) {
blake2b_increment_counter(state, BLAKE2B_BLOCK_BYTES);
blake2b_compress(state, in);
in += fill;
in_len -= fill;
}
}
memcpy(state->buf + state->buf_len, in, in_len);
state->buf_len += in_len;
}
static void blake2b_final(struct blake2b_state *state, void *out) {
uint8_t buffer[BLAKE2B_OUT_BYTES] = {0};
blake2b_increment_counter(state, state->buf_len);
state->f[0] = (uint64_t)-1;
memset(state->buf + state->buf_len, 0, BLAKE2B_BLOCK_BYTES - state->buf_len);
blake2b_compress(state, state->buf);
for (int i = 0; i < 8; i++) {
*(uint64_t *)(buffer + sizeof(state->h[i]) * i) = state->h[i];
}
memcpy(out, buffer, BLAKE2B_OUT_BYTES);
memset(buffer, 0, sizeof(buffer));
}
void blake2b(void *out, const void *in, size_t in_len) {
struct blake2b_state state = {0};
blake2b_init(&state);
blake2b_update(&state, in, in_len);
blake2b_final(&state, out);
}

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common/crypt/blake2b.h Normal file
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#ifndef __CRYPT__BLAKE2B_H__
#define __CRYPT__BLAKE2B_H__
#include <stdbool.h>
#include <stdint.h>
#include <stddef.h>
#define BLAKE2B_OUT_BYTES 64
void blake2b(void *out, const void *in, size_t in_len);
#endif