add PIDigest with SHA and MD series

libs/main/digest/pidigest.h

@@ -0,0 +1,56 @@
+/*! \file pidigest.h
+ * \ingroup Core
+ * \~\brief
+ * \~english Digest algorithms
+ * \~russian Алгоритмы хэш-сумм
+ *
+ * \~\details
+ * \~english
+ * This file implements several common-usage hash algorithms
+ * \~russian
+ * Этот файл реализует несколько распространенных алгоритмов хэширования
+ */
+/*
+	PIP - Platform Independent Primitives
+	Digest algorithms
+	Ivan Pelipenko peri4ko@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 pidigest_h
+#define pidigest_h
+
+#include "pibytearray.h"
+
+class PIP_EXPORT PIDigest {
+public:
+	enum class Type {
+		SHA1,
+		SHA2_224,
+		SHA2_256,
+		SHA2_384,
+		SHA2_512,
+		SHA2_512_224,
+		SHA2_512_256,
+		MD2,
+		MD4,
+		MD5,
+	};
+
+	static int length(Type type);
+	static PIByteArray calculate(const PIByteArray & msg, Type type);
+};
+
+#endif