Sign JoinSplit transactions

src/script/interpreter.h

@@ -12,12 +12,16 @@
 #include <vector>
 #include <stdint.h>
 #include <string>
+#include <climits>
 
 class CPubKey;
 class CScript;
 class CTransaction;
 class uint256;
 
+/** Special case nIn for signing JoinSplits. */
+const unsigned int NOT_AN_INPUT = UINT_MAX;
+
 /** Signature hash types/flags */
 enum
 {