allow hash tables to be randomise

To avoid hash table collision attacks (n.runs-SA-2011.004)
Note that this options is *off* by default, but it is reasonable
to consider reversing this.

Signed-off-by: Steve Bennett <steveb@workware.net.au>

1 files changed, 2 insertions, 0 deletions

diff --git a/auto.def b/auto.def
index 974ecfe..e4b7303 100644
--- a/auto.def
+++ b/auto.def
@@ -18,6 +18,7 @@ options {
     with-jim-shared shared => "build a shared library instead of a static library"
     jim-regexp=1    => "prefer POSIX regex if over the the built-in (Tcl-compatible) regex"
     docs=1          => "don't build or install the documentation"
+    random-hash		=> "randomise hash tables. more secure but hash table results are not predicable"
     with-jim-ext: {with-ext:"ext1 ext2 ..."} => {
         Specify additional jim extensions to include.
         These are enabled by default:
@@ -189,6 +190,7 @@ if {[opt-bool shared with-jim-shared]} {
 define LIBSOEXT [format [get-define SH_SOEXTVER] [format %.2f [expr {[get-define JIM_VERSION] / 100.0}]]]
 define JIM_INSTALL [opt-bool install-jim]
 define JIM_DOCS [opt-bool docs]
+define JIM_RANDOMISE_HASH [opt-bool random-hash]
 
 # Attributes of the extensions
 # tcl=Pure Tcl extension