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Title: ECDSA_verify() problem Post by: d33tah on September 28, 2011, 05:56:49 PM Hi folks,
I've recently thought of an interesting project that could help me understand Bitcoin internals and C programming on embedded devices. The project would be an external Arduino wallet - someone42 sent me an implementation of ECDSA_sign that would work on Atmega's and now I need a verification code so I could be able to test if the signatures generated by the devices are correct. I, with the help of sipa, hacked Bitcoin's Sign() function to look like this: http://wklej.org/id/598789/ ; then, using the data generated by these printf's, I managed to write such an app: http://wklej.org/id/599540/ Unfortunately, although the data should be correct, the ECDSA_verify returns 0. Does anybody have an idea why is that? Title: Re: ECDSA_verify() problem Post by: kokjo on September 28, 2011, 06:00:11 PM do we get the ECDSA_sign code?
Title: Re: ECDSA_verify() problem Post by: d33tah on September 29, 2011, 02:09:12 AM It's a standard code from OpenSSL 1.0.0e crypto.
Title: Re: ECDSA_verify() problem Post by: kokjo on September 29, 2011, 12:03:10 PM It's a standard code from OpenSSL 1.0.0e crypto. can't help you if you are not providing me with the faulty code. :(im thinking the device's code is wrong.... Title: Re: ECDSA_verify() problem Post by: d33tah on September 29, 2011, 02:04:06 PM I'm not testing it on the device. So far, I'm trying to create a testing environment on a PC - I'm trying to build an app, that could just verify, if a given signature is correct or not.
I got the signature data hacking bitcoin client this way: http://wklej.org/id/598789/ And the testing app looks this way: http://wklej.org/id/599540/ Both of which you can easily compile and test yourself - the testing app is complete, yet faulty. So, the problem stays open. |