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ruby/siphash.c

483 строки
11 KiB
C
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#include <string.h>
#include <stdio.h>
#include "siphash.h"
#ifndef SIP_HASH_STREAMING
#define SIP_HASH_STREAMING 1
#endif
#ifdef _WIN32
#define BYTE_ORDER __LITTLE_ENDIAN
#elif !defined BYTE_ORDER
#include <endian.h>
#endif
#ifndef LITTLE_ENDIAN
#define LITTLE_ENDIAN __LITTLE_ENDIAN
#endif
#ifndef BIG_ENDIAN
#define BIG_ENDIAN __BIG_ENDIAN
#endif
#if BYTE_ORDER == LITTLE_ENDIAN
#define lo u32[0]
#define hi u32[1]
#elif BYTE_ORDER == BIG_ENDIAN
#define hi u32[0]
#define lo u32[1]
#else
#error "Only strictly little or big endian supported"
#endif
#ifndef UNALIGNED_WORD_ACCESS
# if defined(__i386) || defined(__i386__) || defined(_M_IX86) || \
defined(__x86_64) || defined(__x86_64__) || defined(_M_AMD64) || \
defined(__powerpc64__) || \
defined(__mc68020__)
# define UNALIGNED_WORD_ACCESS 1
# endif
#endif
#ifndef UNALIGNED_WORD_ACCESS
# define UNALIGNED_WORD_ACCESS 0
#endif
#define U8TO32_LE(p) \
(((uint32_t)((p)[0]) ) | ((uint32_t)((p)[1]) << 8) | \
((uint32_t)((p)[2]) << 16) | ((uint32_t)((p)[3]) << 24)) \
#define U32TO8_LE(p, v) \
do { \
(p)[0] = (uint8_t)((v) ); \
(p)[1] = (uint8_t)((v) >> 8); \
(p)[2] = (uint8_t)((v) >> 16); \
(p)[3] = (uint8_t)((v) >> 24); \
} while (0)
#ifdef HAVE_UINT64_T
#define U8TO64_LE(p) \
((uint64_t)U8TO32_LE(p) | ((uint64_t)U8TO32_LE((p) + 4)) << 32 )
#define U64TO8_LE(p, v) \
do { \
U32TO8_LE((p), (uint32_t)((v) )); \
U32TO8_LE((p) + 4, (uint32_t)((v) >> 32)); \
} while (0)
#define ROTL64(v, s) \
((v) << (s)) | ((v) >> (64 - (s)))
#define ROTL64_TO(v, s) ((v) = ROTL64((v), (s)))
#define ADD64_TO(v, s) ((v) += (s))
#define XOR64_TO(v, s) ((v) ^= (s))
#define XOR64_INT(v, x) ((v) ^= (x))
#else
#define U8TO64_LE(p) u8to64_le(p)
static inline uint64_t
u8to64_le(const uint8_t *p)
{
uint64_t ret;
ret.lo = U8TO32_LE(p);
ret.hi = U8TO32_LE(p + 4);
return ret;
}
#define U64TO8_LE(p, v) u64to8_le(p, v)
static inline void
u64to8_le(uint8_t *p, uint64_t v)
{
U32TO8_LE(p, v.lo);
U32TO8_LE(p + 4, v.hi);
}
#define ROTL64_TO(v, s) ((s) > 32 ? rotl64_swap(rotl64_to(&(v), (s) - 32)) : \
(s) == 32 ? rotl64_swap(&(v)) : rotl64_to(&(v), (s)))
static inline uint64_t *
rotl64_to(uint64_t *v, unsigned int s)
{
uint32_t uhi = (v->hi << s) | (v->lo >> (32 - s));
uint32_t ulo = (v->lo << s) | (v->hi >> (32 - s));
v->hi = uhi;
v->lo = ulo;
return v;
}
static inline uint64_t *
rotl64_swap(uint64_t *v)
{
uint32_t t = v->lo;
v->lo = v->hi;
v->hi = t;
return v;
}
#define ADD64_TO(v, s) add64_to(&(v), (s))
static inline uint64_t *
add64_to(uint64_t *v, const uint64_t s)
{
v->lo += s.lo;
v->hi += s.hi;
if (v->lo < s.lo) v->hi++;
return v;
}
#define XOR64_TO(v, s) xor64_to(&(v), (s))
static inline uint64_t *
xor64_to(uint64_t *v, const uint64_t s)
{
v->lo ^= s.lo;
v->hi ^= s.hi;
return v;
}
#define XOR64_INT(v, x) ((v).lo ^= (x))
#endif
static const union {
char bin[32];
uint64_t u64[4];
} sip_init_state_bin = {"uespemos""modnarod""arenegyl""setybdet"};
#define sip_init_state sip_init_state_bin.u64
#if SIP_HASH_STREAMING
struct sip_interface_st {
void (*init)(sip_state *s, const uint8_t *key);
void (*update)(sip_state *s, const uint8_t *data, size_t len);
void (*final)(sip_state *s, uint64_t *digest);
};
static void int_sip_init(sip_state *state, const uint8_t *key);
static void int_sip_update(sip_state *state, const uint8_t *data, size_t len);
static void int_sip_final(sip_state *state, uint64_t *digest);
static const sip_interface sip_methods = {
int_sip_init,
int_sip_update,
int_sip_final
};
#endif /* SIP_HASH_STREAMING */
#define SIP_COMPRESS(v0, v1, v2, v3) \
do { \
ADD64_TO((v0), (v1)); \
ADD64_TO((v2), (v3)); \
ROTL64_TO((v1), 13); \
ROTL64_TO((v3), 16); \
XOR64_TO((v1), (v0)); \
XOR64_TO((v3), (v2)); \
ROTL64_TO((v0), 32); \
ADD64_TO((v2), (v1)); \
ADD64_TO((v0), (v3)); \
ROTL64_TO((v1), 17); \
ROTL64_TO((v3), 21); \
XOR64_TO((v1), (v2)); \
XOR64_TO((v3), (v0)); \
ROTL64_TO((v2), 32); \
} while(0)
#if SIP_HASH_STREAMING
static void
int_sip_dump(sip_state *state)
{
int v;
for (v = 0; v < 4; v++) {
#if HAVE_UINT64_T
printf("v%d: %" PRIx64 "\n", v, state->v[v]);
#else
printf("v%d: %" PRIx32 "%.8" PRIx32 "\n", v, state->v[v].hi, state->v[v].lo);
#endif
}
}
static void
int_sip_init(sip_state *state, const uint8_t key[16])
{
uint64_t k0, k1;
k0 = U8TO64_LE(key);
k1 = U8TO64_LE(key + sizeof(uint64_t));
state->v[0] = k0; XOR64_TO(state->v[0], sip_init_state[0]);
state->v[1] = k1; XOR64_TO(state->v[1], sip_init_state[1]);
state->v[2] = k0; XOR64_TO(state->v[2], sip_init_state[2]);
state->v[3] = k1; XOR64_TO(state->v[3], sip_init_state[3]);
}
static inline void
int_sip_round(sip_state *state, int n)
{
int i;
for (i = 0; i < n; i++) {
SIP_COMPRESS(state->v[0], state->v[1], state->v[2], state->v[3]);
}
}
static inline void
int_sip_update_block(sip_state *state, uint64_t m)
{
XOR64_TO(state->v[3], m);
int_sip_round(state, state->c);
XOR64_TO(state->v[0], m);
}
static inline void
int_sip_pre_update(sip_state *state, const uint8_t **pdata, size_t *plen)
{
int to_read;
uint64_t m;
if (!state->buflen) return;
to_read = sizeof(uint64_t) - state->buflen;
memcpy(state->buf + state->buflen, *pdata, to_read);
m = U8TO64_LE(state->buf);
int_sip_update_block(state, m);
*pdata += to_read;
*plen -= to_read;
state->buflen = 0;
}
static inline void
int_sip_post_update(sip_state *state, const uint8_t *data, size_t len)
{
uint8_t r = len % sizeof(uint64_t);
if (r) {
memcpy(state->buf, data + len - r, r);
state->buflen = r;
}
}
static void
int_sip_update(sip_state *state, const uint8_t *data, size_t len)
{
uint64_t *end;
uint64_t *data64;
state->msglen_byte = state->msglen_byte + (len % 256);
data64 = (uint64_t *) data;
int_sip_pre_update(state, &data, &len);
end = data64 + (len / sizeof(uint64_t));
#if BYTE_ORDER == LITTLE_ENDIAN
while (data64 != end) {
int_sip_update_block(state, *data64++);
}
#elif BYTE_ORDER == BIG_ENDIAN
{
uint64_t m;
uint8_t *data8 = data;
for (; data8 != (uint8_t *) end; data8 += sizeof(uint64_t)) {
m = U8TO64_LE(data8);
int_sip_update_block(state, m);
}
}
#endif
int_sip_post_update(state, data, len);
}
static inline void
int_sip_pad_final_block(sip_state *state)
{
int i;
/* pad with 0's and finalize with msg_len mod 256 */
for (i = state->buflen; i < sizeof(uint64_t); i++) {
state->buf[i] = 0x00;
}
state->buf[sizeof(uint64_t) - 1] = state->msglen_byte;
}
static void
int_sip_final(sip_state *state, uint64_t *digest)
{
uint64_t m;
int_sip_pad_final_block(state);
m = U8TO64_LE(state->buf);
int_sip_update_block(state, m);
XOR64_INT(state->v[2], 0xff);
int_sip_round(state, state->d);
*digest = state->v[0];
XOR64_TO(*digest, state->v[1]);
XOR64_TO(*digest, state->v[2]);
XOR64_TO(*digest, state->v[3]);
}
sip_hash *
sip_hash_new(const uint8_t key[16], int c, int d)
{
sip_hash *h = NULL;
if (!(h = (sip_hash *) malloc(sizeof(sip_hash)))) return NULL;
return sip_hash_init(h, key, c, d);
}
sip_hash *
sip_hash_init(sip_hash *h, const uint8_t key[16], int c, int d)
{
h->state->c = c;
h->state->d = d;
h->state->buflen = 0;
h->state->msglen_byte = 0;
h->methods = &sip_methods;
h->methods->init(h->state, key);
return h;
}
int
sip_hash_update(sip_hash *h, const uint8_t *msg, size_t len)
{
h->methods->update(h->state, msg, len);
return 1;
}
int
sip_hash_final(sip_hash *h, uint8_t **digest, size_t* len)
{
uint64_t digest64;
uint8_t *ret;
h->methods->final(h->state, &digest64);
if (!(ret = (uint8_t *)malloc(sizeof(uint64_t)))) return 0;
U64TO8_LE(ret, digest64);
*len = sizeof(uint64_t);
*digest = ret;
return 1;
}
int
sip_hash_final_integer(sip_hash *h, uint64_t *digest)
{
h->methods->final(h->state, digest);
return 1;
}
int
sip_hash_digest(sip_hash *h, const uint8_t *data, size_t data_len, uint8_t **digest, size_t *digest_len)
{
if (!sip_hash_update(h, data, data_len)) return 0;
return sip_hash_final(h, digest, digest_len);
}
int
sip_hash_digest_integer(sip_hash *h, const uint8_t *data, size_t data_len, uint64_t *digest)
{
if (!sip_hash_update(h, data, data_len)) return 0;
return sip_hash_final_integer(h, digest);
}
void
sip_hash_free(sip_hash *h)
{
free(h);
}
void
sip_hash_dump(sip_hash *h)
{
int_sip_dump(h->state);
}
#endif /* SIP_HASH_STREAMING */
#define SIP_ROUND(m, v0, v1, v2, v3) \
do { \
XOR64_TO((v3), (m)); \
SIP_COMPRESS(v0, v1, v2, v3); \
XOR64_TO((v0), (m)); \
} while (0)
uint64_t
sip_hash13(const uint8_t key[16], const uint8_t *data, size_t len)
{
uint64_t k0, k1;
uint64_t v0, v1, v2, v3;
uint64_t m, last;
const uint8_t *end = data + len - (len % sizeof(uint64_t));
k0 = U8TO64_LE(key);
k1 = U8TO64_LE(key + sizeof(uint64_t));
v0 = k0; XOR64_TO(v0, sip_init_state[0]);
v1 = k1; XOR64_TO(v1, sip_init_state[1]);
v2 = k0; XOR64_TO(v2, sip_init_state[2]);
v3 = k1; XOR64_TO(v3, sip_init_state[3]);
#if BYTE_ORDER == LITTLE_ENDIAN && UNALIGNED_WORD_ACCESS
{
uint64_t *data64 = (uint64_t *)data;
while (data64 != (uint64_t *) end) {
m = *data64++;
SIP_ROUND(m, v0, v1, v2, v3);
}
}
#else
for (; data != end; data += sizeof(uint64_t)) {
m = U8TO64_LE(data);
SIP_ROUND(m, v0, v1, v2, v3);
}
#endif
#ifdef HAVE_UINT64_T
last = (uint64_t)len << 56;
#define OR_BYTE(n) (last |= ((uint64_t) end[n]) << ((n) * 8))
#else
last.hi = len << 24;
last.lo = 0;
#define OR_BYTE(n) do { \
if (n >= 4) \
last.hi |= ((uint32_t) end[n]) << ((n) >= 4 ? (n) * 8 - 32 : 0); \
else \
last.lo |= ((uint32_t) end[n]) << ((n) >= 4 ? 0 : (n) * 8); \
} while (0)
#endif
switch (len % sizeof(uint64_t)) {
case 7:
OR_BYTE(6);
case 6:
OR_BYTE(5);
case 5:
OR_BYTE(4);
case 4:
#if BYTE_ORDER == LITTLE_ENDIAN && UNALIGNED_WORD_ACCESS
#if HAVE_UINT64_T
last |= (uint64_t) ((uint32_t *) end)[0];
#else
last.lo |= ((uint32_t *) end)[0];
#endif
break;
#else
OR_BYTE(3);
#endif
case 3:
OR_BYTE(2);
case 2:
OR_BYTE(1);
case 1:
OR_BYTE(0);
break;
case 0:
break;
}
SIP_ROUND(last, v0, v1, v2, v3);
XOR64_INT(v2, 0xff);
SIP_COMPRESS(v0, v1, v2, v3);
SIP_COMPRESS(v0, v1, v2, v3);
SIP_COMPRESS(v0, v1, v2, v3);
XOR64_TO(v0, v1);
XOR64_TO(v0, v2);
XOR64_TO(v0, v3);
return v0;
}
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