SHA1.h

/*
 100% free public domain implementation of the SHA-1 algorithm
 by Dominik Reichl <dominik.reichl@t-online.de>
 Web: http://www.dominik-reichl.de/

 Version 1.6 - 2005-02-07 (thanks to Howard Kapustein for patches)
 - You can set the endianness in your files, no need to modify the
   header file of the CSHA1 class any more
 - Aligned data support
 - Made support/compilation of the utility functions (ReportHash
   and HashFile) optional (useful, if bytes count, for example in
   embedded environments)

 Version 1.5 - 2005-01-01
 - 64-bit compiler compatibility added
 - Made variable wiping optional (define SHA1_WIPE_VARIABLES)
 - Removed unnecessary variable initializations
 - ROL32 improvement for the Microsoft compiler (using _rotl)

 ======== Test Vectors (from FIPS PUB 180-1) ========

 SHA1("abc") =
  A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D

 SHA1("abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq") =
  84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1

 SHA1(A million repetitions of "a") =
  34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F
*/

#ifndef ___SHA1_HDR___
#define ___SHA1_HDR___

#if !defined(SHA1_UTILITY_FUNCTIONS) && !defined(SHA1_NO_UTILITY_FUNCTIONS)
#define SHA1_UTILITY_FUNCTIONS
#endif

#include <memory.h> // Needed for memset and memcpy
#include "stdafx.h"

#ifdef SHA1_UTILITY_FUNCTIONS
#include <stdio.h>  // Needed for file access and sprintf
#include <string.h> // Needed for strcat and strcpy
#endif

#ifdef _MSC_VER
#include <stdlib.h>
#endif

// You can define the endian mode in your files, without modifying the SHA1
// source files. Just #define SHA1_LITTLE_ENDIAN or #define SHA1_BIG_ENDIAN
// in your files, before including the SHA1.h header file. If you don't
// define anything, the class defaults to little endian.

#if !defined(SHA1_LITTLE_ENDIAN) && !defined(SHA1_BIG_ENDIAN)
#define SHA1_LITTLE_ENDIAN
#endif

// Same here. If you want variable wiping, #define SHA1_WIPE_VARIABLES, if
// not, #define SHA1_NO_WIPE_VARIABLES. If you don't define anything, it
// defaults to wiping.

#if !defined(SHA1_WIPE_VARIABLES) && !defined(SHA1_NO_WIPE_VARIABLES)
#define SHA1_WIPE_VARIABLES
#endif

// Define 8- and 32-bit variables

//#ifndef uint32_t
//
//#ifdef _MSC_VER
//
//#define uint8_t  unsigned __int8
//#define uint32_t unsigned __int32
//
//#else
//
//#define uint8_t unsigned char
//
//#if (ULONG_MAX == 0xFFFFFFFF)
//#define uint32_t unsigned long
//#else
//#define uint32_t unsigned int
//#endif
//
//#endif
//#endif

// Declare SHA1 workspace

typedef union
{
    uint8_t c[64];
    uint32_t l[16];
} SHA1_WORKSPACE_BLOCK;

class CSHA1
{
public:
#ifdef SHA1_UTILITY_FUNCTIONS
    // Two different formats for ReportHash(...)
    enum
    {
        REPORT_HEX = 0,
        REPORT_DIGIT = 1
    };
#endif

    // Constructor and Destructor
    CSHA1();
    ~CSHA1();

    uint32_t m_state[5];
    uint32_t m_count[2];
    uint32_t __reserved1[1];
    uint8_t m_buffer[64];
    uint8_t m_digest[20];
    uint32_t __reserved2[3];

    void Reset();

    // Update the hash value
    void Update(const uint8_t *data, uint32_t len);
#ifdef SHA1_UTILITY_FUNCTIONS
    bool HashFile(char *szFileName);
#endif

    // Finalize hash and report
    void Final();

// Report functions: as pre-formatted and raw data
#ifdef SHA1_UTILITY_FUNCTIONS
    void ReportHash(char *szReport, unsigned char uReportType = REPORT_HEX);
#endif
    void GetHash(uint8_t *puDest);

private:
    // Private SHA-1 transformation
    void Transform(uint32_t *state, const uint8_t *buffer);

    // Member variables
    uint8_t m_workspace[64];
    SHA1_WORKSPACE_BLOCK *m_block; // SHA1 pointer to the byte array above
};

#endif