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ecdsa_impl: replace scalar if-checks with VERIFY_CHECKs in ecdsa_sig_…
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…sign

Whenever ecdsa_sig_sign is called, in the case that r == 0 or r overflows,
we want to retry with a different nonce rather than fail signing entirely.
Because of this, we always check the nonce conditions before calling
sig_sign, so these checks should always pass (and in particular, they
are inaccessible through the API and appear as uncovered code in test
coverage).
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apoelstra committed Nov 26, 2016
1 parent a8abae7 commit 25e3cfb
Showing 1 changed file with 4 additions and 8 deletions.
12 changes: 4 additions & 8 deletions src/ecdsa_impl.h
Original file line number Diff line number Diff line change
Expand Up @@ -285,14 +285,10 @@ static int secp256k1_ecdsa_sig_sign(const secp256k1_ecmult_gen_context *ctx, sec
secp256k1_fe_normalize(&r.y);
secp256k1_fe_get_b32(b, &r.x);
secp256k1_scalar_set_b32(sigr, b, &overflow);
if (secp256k1_scalar_is_zero(sigr)) {
/* P.x = order is on the curve, so technically sig->r could end up zero, which would be an invalid signature.
* This branch is cryptographically unreachable as hitting it requires finding the discrete log of P.x = N.
*/
secp256k1_gej_clear(&rp);
secp256k1_ge_clear(&r);
return 0;
}
/* These two conditions should be checked before calling */
VERIFY_CHECK(!secp256k1_scalar_is_zero(sigr));
VERIFY_CHECK(overflow == 0);

if (recid) {
/* The overflow condition is cryptographically unreachable as hitting it requires finding the discrete log
* of some P where P.x >= order, and only 1 in about 2^127 points meet this criteria.
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