diff --git a/main.cpp b/main.cpp
index e59754b9..3ec87c18 100644
--- a/main.cpp
+++ b/main.cpp
@@ -115,14 +115,6 @@ public:
 };
 
 
-
-
-
-
-
-
-
-
 class Parent {
 public:
 	virtual void print() {piCout << "Parent";}
@@ -144,6 +136,7 @@ public:
 //#include "unicode/uchar.h"
 
 #include "picrypt.h"
+#include "pifixedpoint.h"
 
 int main (int argc, char * argv[]) {
 	PICrypt cr;
@@ -169,7 +162,7 @@ int main (int argc, char * argv[]) {
 	return 0;
 //	//char uc[] = "←↑→↓АБВ";
 //	char uc[] = "│─┌┐└┘├┤┬┴┼";
-	
+//	─────────────┴─┴┴──┴┴┴─┘
 //	PIString us = PIString::fromUTF8(uc);
 	
 //	//piForeachC (PIChar & c, us)
diff --git a/src/io/pibasetransfer.h b/src/io/pibasetransfer.h
index 34d4dad1..6797c0c4 100644
--- a/src/io/pibasetransfer.h
+++ b/src/io/pibasetransfer.h
@@ -1,3 +1,25 @@
+/*! \file pibasetransfer.h
+ * \brief Base class for reliable send and receive data in fixed packets with error correction, pause and resume
+*/
+/*
+	PIP - Platform Independent Primitives
+	Base class for reliable send and receive data in fixed packets with error correction, pause and resume
+	Copyright (C) 2015 Andrey Bychkov work.a.b@yandex.ru
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
 #ifndef PIBASETRANSFER_H
 #define PIBASETRANSFER_H
 
diff --git a/src/math/picrypt.cpp b/src/math/picrypt.cpp
index f6f807ba..6ff2c15c 100644
--- a/src/math/picrypt.cpp
+++ b/src/math/picrypt.cpp
@@ -21,6 +21,8 @@
 #ifdef PIP_CRYPT
 #  include "sodium.h"
 #endif
+
+
 const char hash_def_key[] = "_picrypt_";
 
 
@@ -144,6 +146,17 @@ PIByteArray PICrypt::hash(const PIString & secret) {
 }
 
 
+PIByteArray PICrypt::generateKey() {
+	PIByteArray hash;
+#ifdef PIP_CRYPT
+	sodium_init();
+	hash.resize(crypto_secretbox_KEYBYTES);
+	randombytes_buf(hash.data(), hash.size());
+#endif
+	return hash;
+}
+
+
 int PICrypt::sizeKey() {
 #ifdef PIP_CRYPT
 	return crypto_secretbox_KEYBYTES;
diff --git a/src/math/picrypt.h b/src/math/picrypt.h
index 61d4ca03..0dfc62fe 100644
--- a/src/math/picrypt.h
+++ b/src/math/picrypt.h
@@ -27,18 +27,40 @@
 
 class PICrypt {
 public:
+	//! Construct and generate random key
 	PICrypt();
 
+	//! Set key to "key", key size must be a \a sizeKey()
 	bool setKey(const PIByteArray & key);
+
+	//! Generate and set key from keyphrase "secret"
 	PIByteArray setKey(const PIString & secret);
+
+	//! Returns current key
 	PIByteArray key() {return key_;}
+
+	//! Encrypt given data "data", result size will be increased by \a sizeCrypt()
 	PIByteArray crypt(const PIByteArray & data);
+
+	//! Decrypt given data "crypt_data"
 	PIByteArray decrypt(const PIByteArray & crypt_data, bool * ok = 0);
 
+	//! Encrypt given data "data" with key "key", result size will be increased by \a sizeCrypt()
 	static PIByteArray crypt(const PIByteArray & data, const PIByteArray & key);
+
+	//! Decrypt given data "crypt_data" with key "key"
 	static PIByteArray decrypt(const PIByteArray & crypt_data, const PIByteArray & key, bool * ok = 0);
+
+	//! Generate hash from keyphrase "secret", may be used as a key for encryption
 	static PIByteArray hash(const PIString & secret);
+
+	//! Generate random key
+	static PIByteArray generateKey();
+
+	//! Returns key size
 	static int sizeKey();
+
+	//! Returns size which be added to data size in encryption process
 	static int sizeCrypt();
 
 private: