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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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69
src/sm2_recover.c
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@@ -13,67 +13,8 @@
#include <assert.h>
#include <gmssl/sm2.h>
#include <gmssl/error.h>
#include "sm2_recover.h"
static int sm2_bn_rshift(SM2_BN ret, const SM2_BN a, unsigned int nbits)
{
SM2_BN r;
int i;
assert(nbits < 32);
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;
}
static int test_sm2_bn_rshift(void)
{
SM2_BN a;
int i;
sm2_bn_from_hex(a, "ad23f3bff55b45c7192e25efcefa5fcecab1f072cd04a88e6cf64bfd3f531966");
sm2_bn_print(stderr, 0, 0, "a", a);
for (i = 0; i < 64; i++) {
sm2_bn_rshift(a, a, 31);
sm2_bn_print(stderr, 0, 0, "a", a);
}
return 0;
}
static 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;
}
static int test_sm2_fp_sqrt(void)
{
// a = 0x998eb0e4b8399fb359268966270049a6a4a317f9417c572c910d80c09969dc3
// a^2 = 0x1b20ef7d2082f66c7561cdd4cdb0a8d58fa753e3e0d2e0560c80c849568f3fdb
return 1;
}
// r = H(Z||M) + x1 (mod n)
// x1 = r - H(Z||M) (mod n) or (r - H(Z||M) (mod n)) + n
// y1 = sqrt(x1^3 + a*x1 + b)
@@ -188,13 +129,3 @@ static int test_sm2_signature_to_public_key_points(void)
return 1;
}
#if 0
int main(void)
{
//test_sm2_bn_rshift();
//test_sm2_fp_sqrt();
test_sm2_signature_to_public_key_points();
return 0;
}
#endif