add shorthash to PICrypt

git-svn-id: svn://db.shs.com.ru/pip@130 12ceb7fc-bf1f-11e4-8940-5bc7170c53b5

src/math/picrypt.h

@@ -54,6 +54,9 @@ public:
 	//! Generate hash from keyphrase "secret", may be used as a key for encryption
 	static PIByteArray hash(const PIString & secret);
 
+	//! Generate short hash from string "s", may be used for hash table
+	static ullong shorthash(const PIString & s, PIByteArray key = PIByteArray());
+	
 	//! Generate random key
 	static PIByteArray generateKey();