74 lines
2.6 KiB
C
74 lines
2.6 KiB
C
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/*
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* Copyright (C) 2005, 2006, 2008, 2009 Free Software Foundation, Inc.
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* Copyright (C) 2011,2015,2016 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#ifndef SHA256_H
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#define SHA256_H
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#include <cstdint>
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enum {
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SHA256_DIGEST_SIZE = 256 / 8
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};
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class CSHA256 {
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public:
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CSHA256();
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~CSHA256();
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/* Starting with the result of former calls of this function (or the
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initialization function update the context for the next LEN bytes
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starting at BUFFER.
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It is necessary that LEN is a multiple of 64!!! */
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void processBlock(const unsigned char* buffer, unsigned int len);
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/* Starting with the result of former calls of this function (or the
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initialization function update the context for the next LEN bytes
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starting at BUFFER.
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It is NOT required that LEN is a multiple of 64. */
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void processBytes(const unsigned char* buffer, unsigned int len);
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/* Process the remaining bytes in the buffer and put result from CTX
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in first 32 bytes following RESBUF. The result is always in little
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endian byte order, so that a byte-wise output yields to the wanted
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ASCII representation of the message digest. */
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unsigned char* finish(unsigned char* resbuf);
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/* Put result from CTX in first 32 bytes following RESBUF. The result is
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always in little endian byte order, so that a byte-wise output yields
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to the wanted ASCII representation of the message digest. */
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unsigned char* read(unsigned char* resbuf);
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/* Compute SHA256 message digest for LEN bytes beginning at BUFFER. The
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result is always in little endian byte order, so that a byte-wise
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output yields to the wanted ASCII representation of the message
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digest. */
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unsigned char* buffer(const unsigned char* buffer, unsigned int len, unsigned char* resblock);
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private:
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uint32_t* m_state;
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uint32_t* m_total;
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unsigned int m_buflen;
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uint32_t* m_buffer;
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void init();
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void conclude();
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};
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#endif
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