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94 lines
2.2 KiB
C++
94 lines
2.2 KiB
C++
/*
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* fhicl-sha1.h
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*
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* Copyright (C) 1998, 2009
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* Paul E. Jones <paulej@packetizer.com>
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* All Rights Reserved.
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*
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*****************************************************************************
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* $Id: fhicl-sha1.h 12 2009-06-22 19:34:25Z paulej $
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*****************************************************************************
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*
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* Description:
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* This class implements the Secure Hashing Standard as defined
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* in FIPS PUB 180-1 published April 17, 1995.
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*
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* Many of the variable names in this class, especially the single
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* character names, were used because those were the names used
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* in the publication.
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*
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* Please read the file fhicl-sha1.cpp for more information.
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*
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*/
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#ifndef _SHA1_H_
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#define _SHA1_H_
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namespace fhicl {
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class SHA1
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{
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public:
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SHA1();
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virtual ~SHA1();
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/*
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* Re-initialize the class
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*/
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void Reset();
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/*
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* Returns the message digest
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*/
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bool Result(unsigned *message_digest_array);
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/*
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* Provide input to SHA1
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*/
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void Input( const unsigned char *message_array,
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unsigned length);
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void Input( const char *message_array,
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unsigned length);
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void Input(unsigned char message_element);
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void Input(char message_element);
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SHA1& operator<<(const char *message_array);
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SHA1& operator<<(const unsigned char *message_array);
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SHA1& operator<<(const char message_element);
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SHA1& operator<<(const unsigned char message_element);
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private:
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/*
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* Process the next 512 bits of the message
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*/
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void ProcessMessageBlock();
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/*
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* Pads the current message block to 512 bits
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*/
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void PadMessage();
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/*
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* Performs a circular left shift operation
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*/
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inline unsigned CircularShift(int bits, unsigned word);
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unsigned H[5]; // Message digest buffers
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unsigned Length_Low; // Message length in bits
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unsigned Length_High; // Message length in bits
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unsigned char Message_Block[64]; // 512-bit message blocks
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int Message_Block_Index; // Index into message block array
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bool Computed; // Is the digest computed?
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bool Corrupted; // Is the message digest corruped?
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};
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} // end of namespace mf
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#endif
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