Signing data with user specified Key

[Werner Koch]

On Thu, 14 Sep 2017 14:26, sandhya.sharma at morpho.com said:

> I am using GPG4Win and have to sign data with a specified key through
> my code in C++.But I didn't find much help on how to specify key for
> signing data in GPG

You need to put the signer into the context.  See this secion in the
gpgme manual:

7.7.4.1 Selecting Signers
.........................

The key or the keys used to create a signature are stored in the
context.  The following functions can be used to manipulate this list.
If no signer has been set into the context a default key is used for
signing.

 -- Function: void gpgme_signers_clear (gpgme_ctx_t CTX)
     The function ‘gpgme_signers_clear’ releases a reference for each
     key on the signers list and removes the list of signers from the
     context CTX.

     Every context starts with an empty list.

 -- Function: gpgme_error_t gpgme_signers_add (gpgme_ctx_t CTX,
          const gpgme_key_t KEY)
     The function ‘gpgme_signers_add’ adds the key KEY to the list of
     signers in the context CTX.

     Calling this function acquires an additional reference for the key.

[...]

There is also an example program: gpgme/tests/run-sign.c


Shalom-Salam,

   Werner


-- 
Die Gedanken sind frei.  Ausnahmen regelt ein Bundesgesetz.
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