Support encrypted backup files
Also includes features merged from:
Update twrpTar by kokotas
Revised function entryExists().
Added function to get archive's uncompressed size.
Added option to exclude item(s) from the archive.
Revised forks()
http://review.teamw.in/#/c/590/
Change-Id: I01fa2c81643161984eff2625247af75990684bd9
diff --git a/openaes/src/isaac/rand.h b/openaes/src/isaac/rand.h
new file mode 100644
index 0000000..73f6e3e
--- /dev/null
+++ b/openaes/src/isaac/rand.h
@@ -0,0 +1,56 @@
+/*
+------------------------------------------------------------------------------
+rand.h: definitions for a random number generator
+By Bob Jenkins, 1996, Public Domain
+MODIFIED:
+ 960327: Creation (addition of randinit, really)
+ 970719: use context, not global variables, for internal state
+ 980324: renamed seed to flag
+ 980605: recommend RANDSIZL=4 for noncryptography.
+ 010626: note this is public domain
+------------------------------------------------------------------------------
+*/
+#ifndef STANDARD
+#include "standard.h"
+#endif
+
+#ifndef RAND
+#define RAND
+#define RANDSIZL (8)
+#define RANDSIZ (1<<RANDSIZL)
+
+/* context of random number generator */
+struct randctx
+{
+ ub4 randcnt;
+ ub4 randrsl[RANDSIZ];
+ ub4 randmem[RANDSIZ];
+ ub4 randa;
+ ub4 randb;
+ ub4 randc;
+};
+typedef struct randctx randctx;
+
+/*
+------------------------------------------------------------------------------
+ If (flag==TRUE), then use the contents of randrsl[0..RANDSIZ-1] as the seed.
+------------------------------------------------------------------------------
+*/
+void randinit(/*_ randctx *r, word flag _*/);
+
+void isaac(/*_ randctx *r _*/);
+
+
+/*
+------------------------------------------------------------------------------
+ Call rand(/o_ randctx *r _o/) to retrieve a single 32-bit random value
+------------------------------------------------------------------------------
+*/
+#define rand(r) \
+ (!(r)->randcnt-- ? \
+ (isaac(r), (r)->randcnt=RANDSIZ-1, (r)->randrsl[(r)->randcnt]) : \
+ (r)->randrsl[(r)->randcnt])
+
+#endif /* RAND */
+
+