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SHA256.h

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+/*
+ *   Copyright (C) 2005, 2006, 2008, 2009 Free Software Foundation, Inc.
+ *   Copyright (C) 2011,2015 by Jonathan Naylor G4KLX
+ *
+ *   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 2 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, write to the Free Software
+ *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef SHA256_H
+#define SHA256_H
+
+#if defined(WIN32)
+typedef unsigned int uint32_t;
+#else
+#include <cstdint>
+#endif
+
+enum {
+	SHA256_DIGEST_SIZE = 256 / 8
+};
+
+class CSHA256 {
+public:
+	CSHA256();
+	~CSHA256();
+
+	/* Starting with the result of former calls of this function (or the
+	   initialization function update the context for the next LEN bytes
+	   starting at BUFFER.
+	   It is necessary that LEN is a multiple of 64!!! */
+	void processBlock(const unsigned char* buffer, unsigned int len);
+
+	/* Starting with the result of former calls of this function (or the
+	   initialization function update the context for the next LEN bytes
+	   starting at BUFFER.
+	   It is NOT required that LEN is a multiple of 64.  */
+	void processBytes(const unsigned char* buffer, unsigned int len);
+
+	/* Process the remaining bytes in the buffer and put result from CTX
+	   in first 32 bytes following RESBUF.  The result is always in little
+	   endian byte order, so that a byte-wise output yields to the wanted
+	   ASCII representation of the message digest.  */
+	unsigned char* finish(unsigned char* resbuf);
+
+	/* Put result from CTX in first 32 bytes following RESBUF.  The result is
+	   always in little endian byte order, so that a byte-wise output yields
+	   to the wanted ASCII representation of the message digest.  */
+	unsigned char* read(unsigned char* resbuf);
+
+	/* Compute SHA256 message digest for LEN bytes beginning at BUFFER.  The
+	   result is always in little endian byte order, so that a byte-wise
+	   output yields to the wanted ASCII representation of the message
+	   digest.  */
+	unsigned char* buffer(const unsigned char* buffer, unsigned int len, unsigned char* resblock);
+
+private:
+	uint32_t*    m_state;
+	uint32_t*    m_total;
+	unsigned int m_buflen;
+	uint32_t*    m_buffer;
+
+	void init();
+	void conclude();
+};
+
+#endif