git-svn-id: svn://db.shs.com.ru/pip@400 12ceb7fc-bf1f-11e4-8940-5bc7170c53b5

src_main/math/picrypt.h

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+/*! \file picrypt.h
+ * \brief Cryptographic class using lib Sodium
+*/
+/*
+    PIP - Platform Independent Primitives
+    Cryptographic class using lib Sodium
+	Copyright (C) 2016 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 PICRYPT_H
+#define PICRYPT_H
+
+#include "pistring.h"
+
+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, PIByteArray key);
+
+	//! Decrypt given data "crypt_data" with key "key"
+	static PIByteArray decrypt(const PIByteArray & crypt_data, 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 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();
+
+	//! Returns key size
+	static size_t sizeKey();
+
+	//! Returns size which be added to data size in encryption process
+	static size_t sizeCrypt();
+
+private:
+	PIByteArray nonce_, key_;
+	
+};
+
+#endif // PICRYPT_H