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SHA256: use uint64_t for the counter instead of two uint32_t

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This commit is contained in:
Frank Denis 2015-06-06 12:32:23 +02:00
parent 21fc07e6f4
commit ba1cd6a128
2 changed files with 30 additions and 24 deletions
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52
src/libsodium/crypto_hash/sha256/cp/hash_sha256.c
View File

@ -40,6 +40,7 @@
/* Avoid namespace collisions with BSD <sys/endian.h>. */
#define be32dec _sha256_be32dec
#define be32enc _sha256_be32enc
#define be64enc _sha256_be64enc
static inline uint32_t
be32dec(const void *pp)
@ -53,7 +54,7 @@ be32dec(const void *pp)
static inline void
be32enc(void *pp, uint32_t x)
{
uint8_t * p = (uint8_t *)pp;
uint8_t *p = (uint8_t *)pp;
p[3] = x & 0xff;
p[2] = (x >> 8) & 0xff;
@ -61,6 +62,21 @@ be32enc(void *pp, uint32_t x)
p[0] = (x >> 24) & 0xff;
}
static inline void
be64enc(void * pp, uint64_t x)
{
uint8_t * p = (uint8_t *)pp;
p[7] = x & 0xff;
p[6] = (x >> 8) & 0xff;
p[5] = (x >> 16) & 0xff;
p[4] = (x >> 24) & 0xff;
p[3] = (x >> 32) & 0xff;
p[2] = (x >> 40) & 0xff;
p[1] = (x >> 48) & 0xff;
p[0] = (x >> 56) & 0xff;
}
static void
be32enc_vect(unsigned char *dst, const uint32_t *src, size_t len)
{
@ -206,9 +222,9 @@ SHA256_Pad(crypto_hash_sha256_state *state)
unsigned char len[8];
uint32_t r, plen;
be32enc_vect(len, state->count, 8);
be64enc(len, state->count);
r = (state->count[1] >> 3) & 0x3f;
r = (state->count >> 3) & 0x3f;
plen = (r < 56) ? (56 - r) : (120 - r);
crypto_hash_sha256_update(state, PAD, (unsigned long long) plen);
@ -218,16 +234,13 @@ SHA256_Pad(crypto_hash_sha256_state *state)
int
crypto_hash_sha256_init(crypto_hash_sha256_state *state)
{
state->count[0] = state->count[1] = 0;
static const uint32_t sha256_initstate[8] = {
0x6a09e667, 0xbb67ae85, 0x3c6ef372, 0xa54ff53a,
0x510e527f, 0x9b05688c, 0x1f83d9ab, 0x5be0cd19
};
state->state[0] = 0x6A09E667;
state->state[1] = 0xBB67AE85;
state->state[2] = 0x3C6EF372;
state->state[3] = 0xA54FF53A;
state->state[4] = 0x510E527F;
state->state[5] = 0x9B05688C;
state->state[6] = 0x1F83D9AB;
state->state[7] = 0x5BE0CD19;
state->count = (uint64_t) 0U;
memcpy(state->state, sha256_initstate, sizeof sha256_initstate);
return 0;
}
@ -237,20 +250,13 @@ crypto_hash_sha256_update(crypto_hash_sha256_state *state,
const unsigned char *in,
unsigned long long inlen)
{
uint32_t bitlen[2];
uint32_t r;
r = (state->count[1] >> 3) & 0x3f;
bitlen[1] = ((uint32_t)inlen) << 3;
bitlen[0] = (uint32_t)(inlen >> 29);
/* LCOV_EXCL_START */
if ((state->count[1] += bitlen[1]) < bitlen[1]) {
state->count[0]++;
if (inlen <= 0U) {
return 0;
}
/* LCOV_EXCL_STOP */
state->count[0] += bitlen[0];
r = (state->count >> 3) & 0x3f;
state->count += (uint64_t)(inlen) << 3;
if (inlen < 64 - r) {
memcpy(&state->buf[r], in, inlen);

2
src/libsodium/include/sodium/crypto_hash_sha256.h
View File

@ -23,7 +23,7 @@ extern "C" {
typedef struct crypto_hash_sha256_state {
uint32_t state[8];
uint32_t count[2];
uint64_t count;
unsigned char buf[64];
} crypto_hash_sha256_state;
SODIUM_EXPORT