--- Day changed Tue Jan 26 2016
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08:32 < jonasschnelli> Hmm...
08:33 < jonasschnelli> I'm parsing a compact signature with secp256k1_ecdsa_signature_parse_compact(), then serialize it to DER (secp256k1_ecdsa_signature_serialize_der)...
08:33 < jonasschnelli> But my bitcoind responses with: non-mandatory-script-verify-flag
08:33 < jonasschnelli> I was expecting secp256k1_ecdsa_signature_serialize_der respects the low_s change?
08:34 < jonasschnelli> (maybe I need to update libsecp)
08:34 < sipa> serialize just serializes
08:34 < sipa> changing the s value is not part of serialization
08:34 < sipa> if you want that, there is a separate function
08:35  * jonasschnelli is checking the header
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08:35 < sipa> secp256k1_ecdsa_signature_normalize
08:36 < jonasschnelli> sipa! Thank you so much... saved my day.
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11:07 < arubi> I'll ask here since I don't know of a better channel, did anyone look at this:  https://eprint.iacr.org/2016/058.pdf  (.pdf warning blabla..)?  two notable quotes:
11:08 < arubi> "Thus, in order the DSA schemes to be protected from our[s] attacks the secret, the ephemeral keys and their modular inverses must have the same size as q."
11:08 < arubi> "Note that in the case where the secret, the ephemeral keys and their modular inverses have the same size as q, our attacks cannot be applied."
11:10 < arubi> I'm trying out the example on p. 11.  I can get to C1=.. and D1=.. , but then 'y + Dix + Ci ≡ 0 (mod q); (i = 1, 2, 3)' doen't hold..
11:14 < arubi> hm.  also, I can only recreate the signature for z1,k1,d successfully.  the others are not the same.  probably something broken on my end.  if someone's brave enough to try it, do let me know please.  I've already invested hours..
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