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Re-arrange SM2

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This commit is contained in:
Zhi Guan
2022-11-02 22:01:23 +08:00
parent d72866b28e
commit 9dfc5e5d80
7 changed files with 94 additions and 130 deletions
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43
src/sm2_alg.c
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@@ -268,6 +268,28 @@ void sm2_bn_set_word(SM2_BN r, uint32_t a)
}
}
int sm2_bn_rshift(SM2_BN ret, const SM2_BN a, unsigned int nbits)
{
SM2_BN r;
int i;
if (nbits > 31) {
error_print();
return -1;
}
if (nbits == 0) {
sm2_bn_copy(ret, a);
}
for (i = 0; i < 7; i++) {
r[i] = a[i] >> nbits;
r[i] |= (a[i+1] << (32 - nbits)) & 0xffffffff;
}
r[i] = a[i] >> nbits;
sm2_bn_copy(ret, r);
return 1;
}
void sm2_bn_add(SM2_BN r, const SM2_BN a, const SM2_BN b)
{
int i;
@@ -504,6 +526,27 @@ void sm2_fp_inv(SM2_Fp r, const SM2_Fp a)
sm2_bn_clean(a5);
}
int sm2_fp_sqrt(SM2_Fp r, const SM2_Fp a)
{
SM2_BN u;
SM2_BN y; // temp result, prevent call sm2_fp_sqrt(a, a)
// r = a^((p - 1)/4) when p = 3 (mod 4)
sm2_bn_add(u, SM2_P, SM2_ONE);
sm2_bn_rshift(u, u, 2);
sm2_fp_exp(y, a, u);
// check r^2 == a
sm2_fp_sqr(u, y);
if (sm2_bn_cmp(u, a) != 0) {
error_print();
return -1;
}
sm2_bn_copy(r, y);
return 1;
}
void sm2_fn_add(SM2_Fn r, const SM2_Fn a, const SM2_Fn b)
{
sm2_bn_add(r, a, b);