[PATCH] Truncate hash values for ECDSA signature scheme

[Werner Koch]

On Tue, 17 Dec 2013 12:37, dbaryshkov at gmail.com said:

> if (mpi_is_opaque(input))
>   {
>       abuf = mpi_get_opaque (input, &abits);
>       rc = _gcry_mpi_scan (&hash, GCRYMPI_FMT_USG, abuf, (abits+7)/8, NULL);
>   }
>   else
>   {
>     hash = mpi_copy(input)
>     abits = mpi_get_nbits(input);
>   }
>   if (abits > qbits)
>     mpi_rshift (hash, hash, abits - qbits);
>
> This would be more correct, isn't it?

Yes.


Shalom-Salam,

   Werner

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