Digital Signature Verification

[Vishal Rana]

Hi Team,

Thank you Shalom, above suggestion is working.
But Digital signature verify is still not working.

> I am signing image using *gnupg* from server side using "--detach-sign"
and getting *"image.sig*" file.
> Which I am trying to verify on another machine using libgcrypt. On the
verification side I am having "image.bin",image.sig, "PublicKey".
I am applying a hashing func on "image.bin" at the verification side to get
MsgDigest_of_RxMsg.
I am passing arguments to _gcry_pk_verify ( "Rx_image.sig",
MsgDigest_of_RxMsg , Public_key).

Please suggest it to me if I am missing any step. Like any conversion or
decoding is required for "image.sig" before passing it to _gcry_pk_verify
().


Regards,
Vishal Rana.






On Thu, Apr 7, 2022 at 7:44 PM Werner Koch <wk at gnupg.org> wrote:

> On Thu,  7 Apr 2022 15:26, Vishal Rana said:
>
> > Please suggest to me how to proceed.
>
> Most GnuPG tools feature a debug option
>
> --debug mpi
> --debug crypto
>
> which shows you lots of debug info. For example the raw RSA parameters.
> Use "--debug help" to see all debug classes. But always remember that
> these are debug options and the output is not a stable API in any way.
>
>
> Shalom-Salam,
>
>    Werner
>
>
> --
> The pioneers of a warless world are the youth that
> refuse military service.             - A. Einstein
>


-- 




*Thanks & Regards,Vishal RanaMobile :09422123401*
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