The ECDSA_do function seems working: the verification process failed when I
changed a bit in the string of the verify process.

Yep, the verify process should be slower.



David Jacobson-3 wrote:
> 
> 
> It doesn't sound possible.  In fact, ECDSA verify has two point 
> multiplications vs. one for ECDSA sign.  So it should be slower.  But 
> here is a technique that will help resolve the issue.  Change one byte 
> of the message, and try to verify.  If it verifies successfully, you 
> know it is not working.
> 
>    -- David Jacobson
> ______________________________________________________________________
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> 
> 

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