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Gorachya
2024-03-14 20:06:11 +08:00
committed by GitHub
parent 1d00270ae0
commit 44c7d63c9d
3 changed files with 183 additions and 1 deletions
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24
src/sm9_z256_key.c
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@@ -424,6 +424,30 @@ int sm9_enc_master_key_extract_key(SM9_ENC_MASTER_KEY *msk, const char *id, size
return 1;
}
int sm9_exch_master_key_extract_key(SM9_EXCH_MASTER_KEY *msk, const char *id, size_t idlen,
SM9_EXCH_KEY *key)
{
sm9_z256_t t;
// t1 = H1(ID || hid, N) + ke
sm9_z256_hash1(t, id, idlen, SM9_HID_EXCH);
sm9_z256_fn_add(t, t, msk->ke);
if (sm9_z256_fn_is_zero(t)) {
error_print();
return -1;
}
// t2 = ke * t1^-1
sm9_z256_fn_inv(t, t);
sm9_z256_fn_mul(t, t, msk->ke);
// de = t2 * P2
sm9_z256_twist_point_mul_generator(&key->de, t);
key->Ppube = msk->Ppube;
return 1;
}
#define OID_SM9 oid_sm_algors,302
static uint32_t oid_sm9[] = { OID_SM9 };