Re: Ruby Quiz - Challenge #5 - Crypto Mining - Find the Winning Lucky Number - Nonce (=Number used ONCE) for the Proof-of-Work (PoW) Hash (SHA-256)

> On Nov 17, 2018, at 09:44, Frank J. Cameron <[email protected]> wrote:
> 
> class RubyQuizTest
>  def compute_nonce(data)
>    0.upto(Float::INFINITY) do |nonce|
>      break nonce if sha256("#{nonce}#{data}", 2)==0
>    end
>  end
>  require 'inline'
>  inline do |builder|
>    builder.include '<string.h>'
>    builder.include '<openssl/sha.h>'
>    builder.c <<-END
>      int sha256(char * s, int difficulty) {
>        unsigned char * d = SHA256((unsigned char *)s, strlen(s), 0);
>        for(int i=0; i<difficulty; i++) if (d[i] != 0) return -1;
>        return 0;
>      }
>    END
>  end
> end
> RubyQuizTest.new('fjc’)

Daaaaamn… good job! It’s so rare to see inline used in the wild!

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