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Clean code

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This commit is contained in:
Zhi Guan
2026-06-22 23:40:58 +08:00
parent 8ed5e266d1
commit 5581ad21b8
18 changed files with 1105 additions and 1150 deletions
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91
src/ecdsa.c
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@@ -23,8 +23,11 @@ int ecdsa_signature_print_ex(FILE *fp, int fmt, int ind, const char *label, cons
{
format_print(fp, fmt, ind, "%s\n", label);
ind += 4;
secp256r1_print(fp, fmt, ind, "r", sig->r);
secp256r1_print(fp, fmt, ind, "s", sig->s);
if (secp256r1_print(fp, fmt, ind, "r", sig->r) != 1
|| secp256r1_print(fp, fmt, ind, "s", sig->s) != 1) {
error_print();
return -1;
}
return 1;
}
@@ -53,21 +56,33 @@ int ecdsa_do_sign_ex(const SECP256R1_KEY *key, const secp256r1_t k, const uint8_
SECP256R1_POINT P;
// e = hash(m)
secp256r1_from_32bytes(e, dgst);
secp256r1_modn(e, e);
if (secp256r1_from_32bytes(e, dgst) != 1
|| secp256r1_modn(e, e) != 1) {
error_print();
return -1;
}
// (x1, y1) = k*G
secp256r1_point_mul_generator(&P, k);
secp256r1_point_get_xy(&P, x1, y1);
if (secp256r1_point_mul_generator(&P, k) != 1
|| secp256r1_point_get_xy(&P, x1, y1) != 1) {
error_print();
return -1;
}
// r = x1 mod n
secp256r1_modn(sig->r, x1);
if (secp256r1_modn(sig->r, x1) != 1) {
error_print();
return -1;
}
// s = k^-1 * (e + d * r) mod n
secp256r1_modn_inv(k_inv, k);
secp256r1_modn_mul(sig->s, key->private_key, sig->r);
secp256r1_modn_add(sig->s, sig->s, e);
secp256r1_modn_mul(sig->s, sig->s, k_inv);
if (secp256r1_modn_inv(k_inv, k) != 1
|| secp256r1_modn_mul(sig->s, key->private_key, sig->r) != 1
|| secp256r1_modn_add(sig->s, sig->s, e) != 1
|| secp256r1_modn_mul(sig->s, sig->s, k_inv) != 1) {
error_print();
return -1;
}
return 1;
}
@@ -114,26 +129,46 @@ int ecdsa_do_verify(const SECP256R1_KEY *key, const uint8_t dgst[32], const ECDS
}
// e = hash(m)
secp256r1_from_32bytes(e, dgst);
secp256r1_modn(e, e);
if (secp256r1_from_32bytes(e, dgst) != 1
|| secp256r1_modn(e, e) != 1) {
error_print();
return -1;
}
// w = s^-1 (mod n)
secp256r1_modn_inv(w, sig->s);
if (secp256r1_modn_inv(w, sig->s) != 1) {
error_print();
return -1;
}
// u1 = e * w (mod n)
secp256r1_modn_mul(u1, e, w);
if (secp256r1_modn_mul(u1, e, w) != 1) {
error_print();
return -1;
}
// u2 = r * w (mod n)
secp256r1_modn_mul(u2, sig->r, w);
if (secp256r1_modn_mul(u2, sig->r, w) != 1) {
error_print();
return -1;
}
// (x1, y1) = u1*G + u2*Q
secp256r1_point_mul_generator(&P, u1);
secp256r1_point_mul(&Q, u2, &key->public_key);
secp256r1_point_add(&R, &P, &Q);
secp256r1_point_get_xy(&R, x1, y1);
if (secp256r1_point_mul_generator(&P, u1) != 1
|| secp256r1_point_mul(&Q, u2, &key->public_key) != 1
|| secp256r1_point_add(&R, &P, &Q) != 1) {
error_print();
return -1;
}
if (secp256r1_point_get_xy(&R, x1, y1) != 1) {
return 0;
}
// x1 = x1 mod n
secp256r1_modn(x1, x1);
if (secp256r1_modn(x1, x1) != 1) {
error_print();
return -1;
}
if (secp256r1_cmp(x1, sig->r) != 0) {
return 0;
@@ -151,8 +186,11 @@ int ecdsa_signature_to_der(const ECDSA_SIGNATURE *sig, uint8_t **out, size_t *ou
return 0;
}
secp256r1_to_32bytes(sig->r, r);
secp256r1_to_32bytes(sig->s, s);
if (secp256r1_to_32bytes(sig->r, r) != 1
|| secp256r1_to_32bytes(sig->s, s) != 1) {
error_print();
return -1;
}
if (asn1_integer_to_der(r, 32, NULL, &len) != 1
|| asn1_integer_to_der(s, 32, NULL, &len) != 1
@@ -186,8 +224,11 @@ int ecdsa_signature_from_der(ECDSA_SIGNATURE *sig, const uint8_t **in, size_t *i
return -1;
}
secp256r1_from_32bytes(sig->r, r);
secp256r1_from_32bytes(sig->s, s);
if (secp256r1_from_32bytes(sig->r, r) != 1
|| secp256r1_from_32bytes(sig->s, s) != 1) {
error_print();
return -1;
}
return 1;
}