Re: [ANN] Nxt Bounty for working JavaScript code that signs and verifies signatures
hoax, did you test the original cpp code? I tried but I got funny results 
I wouldn't be shocked if there is a bug in the Java code. Cfb's expectation that ~25% of signatures can't be verified is surprising to me. Also, the fact that the C++ code is using uint8 types whereas the JavaScript code is using longs for essentially the same thing is suspicious.
Actually, there might be a bug in the C++ code. I compiled it and ran a few tests with sign, but the signature that gets generated is different each time i run the program (typically the sign of an uninitialized variable somewhere). The problem appears to happen somewhere in divmod.