bitcoin/secp256k1 — pull request #8 by swansontec (2014-04-24 21:25:06+00:00)
Title: Check signature nonces for validity

The documentation implies that this check is happening, so make it so.
Without this check, passing an invalid nonce will trigger an internal assertion.

I ran into this when I was unit-testing my C++ wrapper - the library threw an assertion instead of returning false as my test was expecting.