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Precompute midstate of the first SHA-256 in scrypt

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pooler 2012-03-06 00:03:19 +01:00
parent 18033f6a04
commit f073f8ed58
1 changed files with 24 additions and 14 deletions
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38
scrypt.c
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@ -205,8 +205,7 @@ static inline void HMAC_SHA256_80_init(const uint32_t *key,
uint32_t pad[16];
int i;
SHA256_InitState(tstate);
SHA256_Transform(tstate, key, 1);
/* tstate is assumed to contain the midstate of key */
memcpy(pad, key + 16, 16);
memcpy(pad + 4, keypad, 48);
SHA256_Transform(tstate, pad, 1);
@ -333,8 +332,7 @@ static inline void HMAC_SHA256_80_init_4way(const uint32_t *key,
uint32_t pad[4 * 16];
int i;
SHA256_InitState_4way(tstate);
SHA256_Transform_4way(tstate, key, 1);
/* tstate is assumed to contain the midstate of key */
memcpy(pad, key + 4 * 16, 4 * 16);
memcpy(pad + 4 * 4, keypad_4way, 4 * 48);
SHA256_Transform_4way(tstate, pad, 1);
@ -519,13 +517,14 @@ unsigned char *scrypt_buffer_alloc()
}
static void scrypt_1024_1_1_256_sp(const uint32_t *input, uint32_t *output,
unsigned char *scratchpad)
uint32_t *midstate, unsigned char *scratchpad)
{
uint32_t tstate[8], ostate[8];
uint32_t *V;
uint32_t X[32];
V = (uint32_t *)(((uintptr_t)(scratchpad) + 63) & ~ (uintptr_t)(63));
memcpy(tstate, midstate, 32);
HMAC_SHA256_80_init(input, tstate, ostate);
PBKDF2_SHA256_80_128(tstate, ostate, input, X);
@ -536,7 +535,7 @@ static void scrypt_1024_1_1_256_sp(const uint32_t *input, uint32_t *output,
#if SCRYPT_MAX_WAYS >= 2
static void scrypt_1024_1_1_256_sp_2way(const uint32_t *input,
uint32_t *output, unsigned char *scratchpad)
uint32_t *output, uint32_t *midstate, unsigned char *scratchpad)
{
uint32_t tstate1[8], tstate2[8];
uint32_t ostate1[8], ostate2[8];
@ -545,6 +544,8 @@ static void scrypt_1024_1_1_256_sp_2way(const uint32_t *input,
V = (uint32_t *)(((uintptr_t)(scratchpad) + 63) & ~ (uintptr_t)(63));
memcpy(tstate1, midstate, 32);
memcpy(tstate2, midstate, 32);
HMAC_SHA256_80_init(input, tstate1, ostate1);
HMAC_SHA256_80_init(input + 20, tstate2, ostate2);
PBKDF2_SHA256_80_128(tstate1, ostate1, input, X);
@ -559,7 +560,7 @@ static void scrypt_1024_1_1_256_sp_2way(const uint32_t *input,
#if SCRYPT_MAX_WAYS >= 3
static void scrypt_1024_1_1_256_sp_3way(const uint32_t *input,
uint32_t *output, unsigned char *scratchpad)
uint32_t *output, uint32_t *midstate, unsigned char *scratchpad)
{
uint32_t tstate[4 * 8], ostate[4 * 8];
uint32_t X[3 * 32];
@ -574,6 +575,11 @@ static void scrypt_1024_1_1_256_sp_3way(const uint32_t *input,
W[4 * i + 1] = input[i + 20];
W[4 * i + 2] = input[i + 40];
}
for (i = 0; i < 8; i++) {
tstate[4 * i + 0] = midstate[i];
tstate[4 * i + 1] = midstate[i];
tstate[4 * i + 2] = midstate[i];
}
HMAC_SHA256_80_init_4way(W, tstate, ostate);
PBKDF2_SHA256_80_128_4way(tstate, ostate, W, W);
for (i = 0; i < 32; i++) {
@ -615,9 +621,10 @@ int scanhash_scrypt(int thr_id, unsigned char *pdata,
uint32_t max_nonce, uint32_t *next_nonce, unsigned long *hashes_done)
{
uint32_t data[SCRYPT_MAX_WAYS * 20], hash[SCRYPT_MAX_WAYS * 8];
unsigned long first_nonce = *next_nonce;
uint32_t midstate[8];
const uint32_t first_nonce = *next_nonce;
uint32_t n = *next_nonce;
uint32_t Htarg = le32dec(&((const uint32_t *)ptarget)[7]);
const uint32_t Htarg = le32dec(&((const uint32_t *)ptarget)[7]);
const int throughput = scrypt_best_throughput();
int i;
@ -626,25 +633,28 @@ int scanhash_scrypt(int thr_id, unsigned char *pdata,
for (i = 1; i < throughput; i++)
memcpy(data + i * 20, data, 80);
SHA256_InitState(midstate);
SHA256_Transform(midstate, data, 1);
do {
for (i = 0; i < throughput; i++)
data[i * 20 + 19] = n++;
#if SCRYPT_MAX_WAYS >= 3
if (throughput == 3)
scrypt_1024_1_1_256_sp_3way(data, hash, scratchbuf);
scrypt_1024_1_1_256_sp_3way(data, hash, midstate, scratchbuf);
else
#endif
#if SCRYPT_MAX_WAYS >= 2
if (throughput == 2)
scrypt_1024_1_1_256_sp_2way(data, hash, scratchbuf);
scrypt_1024_1_1_256_sp_2way(data, hash, midstate, scratchbuf);
else
#endif
scrypt_1024_1_1_256_sp(data, hash, scratchbuf);
scrypt_1024_1_1_256_sp(data, hash, midstate, scratchbuf);
for (i = 0; i < throughput; i++) {
if (unlikely(hash[i * 8 + 7] <= Htarg)
&& likely(confirm_hash(hash + i * 8, (uint32_t *)ptarget))) {
if (hash[i * 8 + 7] <= Htarg
&& confirm_hash(hash + i * 8, (uint32_t *)ptarget)) {
be32enc(&((uint32_t *)pdata)[19], data[i * 20 + 19]);
*next_nonce = n;
*hashes_done = n - first_nonce;