irc: fix length of string for SHA-512, SHA-256 and SHA-1 in help on ssl_fingerprint option

src/plugins/irc/irc-config.c

@@ -1735,8 +1735,8 @@ irc_config_server_new_option (struct t_config_file *config_file,
                 option_name, "string",
                 N_("fingerprint of certificate which is trusted and accepted "
                    "for the server; only hexadecimal digits are allowed (0-9, "
-                   "a-f): 64 chars for SHA-512, 32 chars for SHA-256, "
-                   "20 chars for SHA-1 (insecure, not recommended); many "
+                   "a-f): 128 chars for SHA-512, 64 chars for SHA-256, "
+                   "40 chars for SHA-1 (insecure, not recommended); many "
                    "fingerprints can be separated by commas; if this option "
                    "is set, the other checks on certificates are NOT "
                    "performed (option \"ssl_verify\") "

src/plugins/irc/irc-server.c

@@ -4147,7 +4147,7 @@ irc_server_fingerprint_search_algo_with_size (int size)
  * Returns a string with sizes of allowed fingerprint,
  * in number of hexadecimal digits (== bits / 4).
  *
- * Example of output: "64=SHA-512, 32=SHA-256, 20=SHA-1".
+ * Example of output: "128=SHA-512, 64=SHA-256, 40=SHA-1".
  *
  * Note: result must be freed after use.
  */
@@ -4165,7 +4165,7 @@ irc_server_fingerprint_str_sizes ()
     {
         snprintf (str_one_size, sizeof (str_one_size),
                   "%d=%s%s",
-                  irc_fingerprint_digest_algos_size[i] / 8,
+                  irc_fingerprint_digest_algos_size[i] / 4,
                   irc_fingerprint_digest_algos_name[i],
                   (i > 0) ? ", " : "");
         strcat (str_sizes, str_one_size);