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Merge pull request #1421 from programminglanguagepl/master

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optimize sm9_fp_mul
This commit is contained in:
Zhi Guan
2023-03-23 13:53:30 +08:00
committed by GitHub
parent 4c6e9143bf 5d9f014660
commit 1702fe3844
1 changed files with 11 additions and 5 deletions
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16
src/sm9_alg.c
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@@ -357,7 +357,7 @@ void sm9_fp_mul(sm9_fp_t r, const sm9_fp_t a, const sm9_fp_t b)
} }
/* q = zh * mu // (2^32)^9 */ /* q = zh * mu // (2^32)^9 */
for (i = 0; i < 18; i++) { for (i = 0; i < 9; i++) {
s[i] = 0; s[i] = 0;
} }
for (i = 0; i < 9; i++) { for (i = 0; i < 9; i++) {
@@ -374,17 +374,23 @@ void sm9_fp_mul(sm9_fp_t r, const sm9_fp_t a, const sm9_fp_t b)
} }
/* q = q * p mod (2^32)^9 */ /* q = q * p mod (2^32)^9 */
for (i = 0; i < 18; i++) { for (i = 0; i < 8; i++) {
s[i] = 0; s[i] = 0;
} }
for (i = 0; i < 9; i++) { w = 0;
for (j = 0; j < 8; j++) {
w += s[j] + q[0] * SM9_P[j];
s[j] = w & 0xffffffff;
w >>= 32;
}
s[8] = w;
for (i = 1; i < 9; i++) {
w = 0; w = 0;
for (j = 0; j < 8; j++) { for (j = 0; i + j < 9; j++) {
w += s[i + j] + q[i] * SM9_P[j]; w += s[i + j] + q[i] * SM9_P[j];
s[i + j] = w & 0xffffffff; s[i + j] = w & 0xffffffff;
w >>= 32; w >>= 32;
} }
s[i + 8] = w;
} }
for (i = 0; i < 9; i++) { for (i = 0; i < 9; i++) {
q[i] = s[i]; q[i] = s[i];