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Update SM2 lib

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Add more checks
Rename _ex functions to _fixlen
Move extensions to sm2_recover.c
This commit is contained in:
Zhi Guan
2023-01-13 01:44:55 +08:00
parent 2f19fc3067
commit c932069224
5 changed files with 350 additions and 209 deletions
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17
src/sm2_recover.c
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@@ -112,3 +112,20 @@ int sm2_signature_to_public_key_points(const SM2_SIGNATURE *sig, const uint8_t d
return 1;
}
// verify the xR of R = s * G + (s + r) * P
// so (-r, -s) is also a valid SM2 signature
int sm2_signature_conjugate(const SM2_SIGNATURE *sig, SM2_SIGNATURE *new_sig)
{
SM2_Fn r;
SM2_Fn s;
sm2_bn_from_bytes(r, sig->r);
sm2_bn_from_bytes(s, sig->s);
sm2_fn_neg(r, r);
sm2_fn_neg(s, s);
sm2_bn_to_bytes(r, new_sig->r);
sm2_bn_to_bytes(s, new_sig->s);
return 1;
}