/*
    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

#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 UINT_32

#ifdef _MSC_VER

#define UINT_8  unsigned __int8
#define UINT_32 unsigned __int32

#else

#define UINT_8 unsigned char

#if (ULONG_MAX == 0xFFFFFFFF)
#define UINT_32 unsigned long
#else
#define UINT_32 unsigned int
#endif

#endif
#endif

/////////////////////////////////////////////////////////////////////////////
// Declare SHA1 workspace

typedef union
{
    UINT_8  c[64];
    UINT_32 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();

    UINT_32 m_state[5];
    UINT_32 m_count[2];
    UINT_32 __reserved1[1];
    UINT_8  m_buffer[64];
    UINT_8  m_digest[20];
    UINT_32 __reserved2[3];

    void Reset();

    // Update the hash value
    void Update(UINT_8 *data, UINT_32 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(UINT_8 *puDest);

private:
    // Private SHA-1 transformation
    void Transform(UINT_32 *state, UINT_8 *buffer);

    // Member variables
    UINT_8 m_workspace[64];
    SHA1_WORKSPACE_BLOCK *m_block; // SHA1 pointer to the byte array above
};

#endif
