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bitcoin: allow developer override of signature grinding.

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Allows us to precisely replicate test vectors.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell 2021-04-27 14:03:48 +09:30
parent 9470ea3032
commit 16735e1352
1 changed files with 13 additions and 1 deletions
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14
bitcoin/signature.c
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@ -94,6 +94,13 @@ static bool sig_has_low_r(const secp256k1_ecdsa_signature* sig)
return compact_sig[0] < 0x80;
}
#if DEVELOPER
/* Some of the spec test vectors assume no sig grinding. */
extern bool dev_no_grind;
bool dev_no_grind = false;
#endif
void sign_hash(const struct privkey *privkey,
const struct sha256_double *h,
secp256k1_ecdsa_signature *s)
@ -106,8 +113,13 @@ void sign_hash(const struct privkey *privkey,
ok = secp256k1_ecdsa_sign(secp256k1_ctx,
s,
h->sha.u.u8,
privkey->secret.data, NULL, extra_entropy);
privkey->secret.data, NULL,
IFDEV(dev_no_grind ? NULL
: extra_entropy,
extra_entropy));
((u32 *)extra_entropy)[0]++;
if (IFDEV(dev_no_grind, false))
break;
} while (!sig_has_low_r(s));
assert(ok);