Check for valid PGP key on start

src/command/commands.c

@@ -4337,8 +4337,8 @@ cmd_pgp(ProfWin *window, const char * const command, gchar **args)
         }
 
         ProfAccount *account = accounts_get_account(jabber_get_account_name());
-        if (!account->pgp_keyid) {
+        if (!p_gpg_valid_key(account->pgp_keyid)) {
-            ui_current_print_formatted_line('!', 0, "You must specify a PGP key ID for this account to start PGP encryption.");
+            ui_current_print_formatted_line('!', 0, "You must specify a valid PGP key ID for this account to start PGP encryption.");
             account_free(account);
             return TRUE;
         }

src/pgp/gpg.c

@@ -280,6 +280,35 @@ p_gpg_free_key(ProfPGPKey *key)
     }
 }
 
+gboolean
+p_gpg_valid_key(const char * const keyid)
+{
+    gpgme_ctx_t ctx;
+    gpgme_error_t error = gpgme_new(&ctx);
+    if (error) {
+        log_error("GPG: Failed to create gpgme context. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        return FALSE;
+    }
+
+    gpgme_key_t key = NULL;
+    error = gpgme_get_key(ctx, keyid, &key, 1);
+
+    if (error || key == NULL) {
+        log_error("GPG: Failed to get key. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        gpgme_release(ctx);
+        return FALSE;
+    }
+
+    if (key) {
+        gpgme_release(ctx);
+        gpgme_key_unref(key);
+        return TRUE;
+    }
+
+    gpgme_release(ctx);
+    return FALSE;
+}
+
 gboolean
 p_gpg_available(const char * const barejid)
 {

src/pgp/gpg.h

@@ -48,6 +48,7 @@ void p_gpg_on_disconnect(void);
 GSList* p_gpg_list_keys(void);
 gboolean p_gpg_addkey(const char * const jid, const char * const keyid);
 GHashTable* p_gpg_fingerprints(void);
+gboolean p_gpg_valid_key(const char * const keyid);
 gboolean p_gpg_available(const char * const barejid);
 const char* p_gpg_libver(void);
 void p_gpg_free_key(ProfPGPKey *key);