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Update sm2_sign.c

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This commit is contained in:
Zhi Guan
2024-06-11 23:16:00 +08:00
parent 47acbe0616
commit 75430408c2
1 changed files with 7 additions and 6 deletions
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13
src/sm2_sign.c
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@@ -36,7 +36,8 @@ int sm2_do_sign(const SM2_KEY *key, const uint8_t dgst[32], SM2_SIGNATURE *sig)
error_print();
return -1;
}
sm2_z256_modn_inv(d_inv, d_inv);
sm2_z256_modn_to_mont(d_inv, d_inv);
sm2_z256_modn_mont_inv(d_inv, d_inv);
// e = H(M)
sm2_z256_from_bytes(e, dgst);
@@ -71,9 +72,10 @@ retry:
}
// s = ((1 + d)^-1 * (k - r * d)) mod n
sm2_z256_modn_mul(t, r, key->private_key);
sm2_z256_modn_to_mont(r, t);
sm2_z256_modn_mont_mul(t, t, key->private_key);
sm2_z256_modn_sub(k, k, t);
sm2_z256_modn_mul(s, d_inv, k);
sm2_z256_modn_mont_mul(s, d_inv, k);
// check s != 0
if (sm2_z256_is_zero(s)) {
@@ -193,7 +195,8 @@ int sm2_fast_sign(const sm2_z256_t fast_private, SM2_SIGN_PRE_COMP *pre_comp,
// s = (k + r) * d' - r
sm2_z256_modn_add(s, pre_comp->k, r);
sm2_z256_modn_mul(s, s, fast_private);
sm2_z256_modn_to_mont(s, s);
sm2_z256_modn_mont_mul(s, s, fast_private); // mont(s) * d = s * R^-1 * d * R = s * d
sm2_z256_modn_sub(s, s, r);
sm2_z256_to_bytes(r, sig->r);
@@ -677,5 +680,3 @@ int sm2_verify_reset(SM2_VERIFY_CTX *ctx)
ctx->sm3_ctx = ctx->saved_sm3_ctx;
return 1;
}