Re: Recovering public key from hash and signature

It should be obvious, but you cannot verify (as in "technically impossible") a digital signature without having public key of the signer. 

It is not recommended to re-invent the basic digital signature algorithms or implementations.

> On Sep 22, 2021, at 15:30, Luca Bonaldo <[email protected]> wrote:
> 
> Hi Jeff, I apologize for my insistance but I do really need support. I'm writing this code for an important project and I cannot wrap my head around a solution. If I'm not asking for too much, could you please guide me to the correct wiki's pages or help me writing a pseudo code to achieve my goal? Thank you so much! 
> 
> Il giorno domenica 19 settembre 2021 alle 21:45:26 UTC+2 Jeffrey Walton ha scritto:
>> On Sun, Sep 19, 2021 at 5:09 AM Luca Bonaldo <[email protected]> wrote: 
>> > 
>> > Hi, I was writing a library to generate a pair of keys, use the private key to sign a hash and finally verify the signature only knowing the hash and the signature. 
>> > 
>> > I'm having quite a hard time doing that, in fact I searched so much just to find myself at the start point. I'll leave my code here, hope that someone can help me. 
>> > 
>> > https://www.codepile.net/pile/Jx2RlQxm 
>> 
>> You should probably take a look at 
>> https://www.cryptopp.com/wiki/Main_Page. It has lots of examples. 
>> 
>> Jeff 
> 
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