src/gpg_keyids.c



    1 // GPGEdit edits GPG encrypted files
    2 // Copyright (C) 2018  Aaron Ball <nullspoon@oper.io>
    3 //
    4 // This program is free software: you can redistribute it and/or modify
    5 // it under the terms of the GNU General Public License as published by
    6 // the Free Software Foundation, either version 3 of the License, or
    7 // (at your option) any later version.
    8 //
    9 // This program is distributed in the hope that it will be useful,
   10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
   11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   12 // GNU General Public License for more details.
   13 //
   14 // You should have received a copy of the GNU General Public License
   15 // along with this program.  If not, see <https://www.gnu.org/licenses/>.
   16 #include "gpg_keyids.h"
   17 
   18 
   19 // gpg_keyids_load_from_recip:
   20 // Converts a gpgme_recipient_t linked list to a string array of key ids. This
   21 // is useful when storing a list of recipients for an already-encrypted file to
   22 // be used when later re-encrypting that file.
   23 //
   24 // @keyids     Pointer to existing keyids string array. Note that the pointer
   25 //             to this will be updated by the array growth process.
   26 // @firstrecip First recipient in the linked list. The list will be traversed
   27 //             starting here.
   28 void gpg_keyids_load_from_recip(char*** keyids, gpgme_recipient_t firstrecip) {
   29   gpgme_recipient_t recip; // Current recipient object
   30   // Write each recipient key id to the char array
   31   recip = firstrecip;
   32   while(recip != NULL) {
   33     strarray_add(keyids, recip->keyid);
   34     recip = recip->next;
   35   }
   36 }
   37 
   38 
   39 // gpg_keyids_to_key_t:
   40 // Converts a string array containing keyids (multiple identifier types are
   41 // supported) into an array of gpgme_key_t objects.
   42 //
   43 // @ctx    GPGME context (already initialized)
   44 // @keyids Pointer to string array of key id strings
   45 //
   46 // @return gpgme_key_t* Array of gpgme_key_t objects, one for each keyid string
   47 gpgme_key_t* gpg_keyids_to_key_t(gpgme_ctx_t ctx, char** keyids) {
   48   gpgme_key_t* out;
   49   gpgme_error_t err;
   50   int count     = 0; // Number of recipients
   51   int i         = 0;
   52 
   53   // Count the keys
   54   while(keyids[count] != NULL)
   55     count++;
   56 
   57   // Allocate the gpgme_key_t pointer array
   58   out = (gpgme_key_t*) malloc(sizeof(gpgme_key_t) * (count + 1));
   59 
   60   // Loop over the keys back to zero
   61   while(i < count) {
   62     err = gpgme_get_key(ctx, keyids[i], &out[i], 0);
   63     gpg_failiferr(err);
   64     i++;
   65   }
   66   out[i] = NULL;
   67   return out;
   68 }