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libs/main/crypt/picrypt.h

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+/*! \file picrypt.h
+ * \brief Cryptographic class using lib Sodium
+*/
+/*
+	PIP - Platform Independent Primitives
+	Cryptographic class using lib Sodium
+	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 Lesser 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 Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef PICRYPT_H
+#define PICRYPT_H
+
+#include "pip_crypt_export.h"
+#include "pistring.h"
+
+class PIP_CRYPT_EXPORT 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 hash from bytearray
+	static PIByteArray hash(const PIByteArray & data);
+
+	//! 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();
+
+	//! Generate random buffer
+	static PIByteArray generateRandomBuff(int size);
+
+	//! Returns key size
+	static size_t sizeKey();
+
+	//! Returns size which be added to data size in encryption process
+	static size_t sizeCrypt();
+
+	//! Function randomly generates a secret key and a corresponding public key for digital signature
+	static void generateSignKeys(PIByteArray & public_key, PIByteArray & secret_key);
+
+	//! Function generates a secret key from input data and a corresponding public key for digital signature
+	static void generateSignKeys(PIByteArray & public_key, PIByteArray & secret_key, const PIByteArray & seed);
+
+	//! Function extract sign public key from sing secret key
+	static PIByteArray extractSignPublicKey(const PIByteArray & secret_key);
+
+	//! Calculate digital signature for data
+	PIByteArray signMessage(const PIByteArray & data,  PIByteArray secret_key);
+
+	//! Verify digital signature of signed message
+	bool verifySign(const PIByteArray & data, const PIByteArray & signature, PIByteArray public_key);
+
+	//! Function randomly generates a secret key and a corresponding public key for authenticated encryption
+	static void generateKeypair(PIByteArray & public_key, PIByteArray & secret_key);
+
+	//! Function generates a secret key from input data and a corresponding public key for authenticated encryption
+	static void generateKeypair(PIByteArray & public_key, PIByteArray & secret_key, const PIByteArray & seed);
+
+	//! Encrypt given data "data"
+	PIByteArray crypt(const PIByteArray &data, const PIByteArray & public_key, const PIByteArray & secret_key);
+
+	//! Decrypt given data "crypt_data"
+	PIByteArray decrypt(const PIByteArray & crypt_data, const PIByteArray & public_key, const PIByteArray & secret_key, bool * ok = 0);
+
+	//! Generate password hash from "password"
+	static PIByteArray passwordHash(const PIString & password, const PIByteArray & seed);
+
+	//! Returns libsodium version
+	static PIString version();
+
+
+private:
+	static bool init();
+
+	PIByteArray nonce_, key_;
+
+};
+
+#endif // PICRYPT_H