add shorthash to PICrypt

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

src/math/picrypt.cpp

@@ -146,6 +146,22 @@ PIByteArray PICrypt::hash(const PIString & secret) {
 }
 
 
+ullong PICrypt::shorthash(const PIString& s, PIByteArray key) {
+	ullong hash;
+#ifdef PIP_CRYPT
+	if (crypto_shorthash_BYTES != sizeof(hash)) piCout << "[PICrypt]" << "internal error: bad hash size";
+	sodium_init();
+	if (key.size() != crypto_shorthash_KEYBYTES) {
+		key.resize(crypto_shorthash_KEYBYTES);
+		randombytes_buf(key.data(), key.size());
+	}
+	PIByteArray in(s.data(), s.size());
+	crypto_shorthash((uchar *)&hash, in.data(), in.size(), key.data());
+#endif
+	return hash;
+}
+
+
 PIByteArray PICrypt::generateKey() {
 	PIByteArray hash;
 #ifdef PIP_CRYPT

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();