SHA-1

Безплатна реализация на SHA-1 алгоритъм на C++.

За изтегляне на програмения фрагмент, посетете този адрес:
http://svn.openimageio.org/oiio/trunk/src/include/SHA1.h


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

Version 1.8 - 2008-03-16
- Converted project files to Visual Studio 2008 format.
- Added Unicode support for HashFile utility method.
- Added support for hashing files using the HashFile method that are
larger than 2 GB.
- HashFile now returns an error code instead of copying an error
message into the output buffer.
- GetHash now returns an error code and validates the input parameter.
- Added ReportHashStl STL utility method.
- Added REPORT_HEX_SHORT reporting mode.
- Improved Linux compatibility of test program.

Version 1.7 - 2006-12-21
- Fixed buffer underrun warning that appeared when compiling with
Borland C Builder (thanks to Rex Bloom and Tim Gallagher for the
patch).
- Breaking change: ReportHash writes the final hash to the start
of the buffer, i.e. it's not appending it to the string anymore.
- Made some function parameters const.
- Added Visual Studio 2005 project files to demo project.

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 anymore.
- Aligned data support.
- Made support/compilation of the utility functions (ReportHash and
HashFile) optional (useful when 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).

Version 1.4 - 2004-07-22
- CSHA1 now compiles fine with GCC 3.3 under MacOS X (thanks to Larry
Hastings).

Version 1.3 - 2003-08-17
- Fixed a small memory bug and made a buffer array a class member to
ensure correct working when using multiple CSHA1 class instances at
one time.

Version 1.2 - 2002-11-16
- Borlands C++ compiler seems to have problems with string addition
using sprintf. Fixed the bug which caused the digest report function
not to work properly. CSHA1 is now Borland compatible.

Version 1.1 - 2002-10-11
- Removed two unnecessary header file includes and changed BOOL to
bool. Fixed some minor bugs in the web page contents.

Version 1.0 - 2002-06-20
- First official release.

======== 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___

#include "export.h"

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

#if !defined(SHA1_STL_FUNCTIONS) && !defined(SHA1_NO_STL_FUNCTIONS)
#define SHA1_STL_FUNCTIONS
#if !defined(SHA1_UTILITY_FUNCTIONS)
#error STL functions require SHA1_UTILITY_FUNCTIONS.
#endif
#endif

#include

#ifdef SHA1_UTILITY_FUNCTIONS
#include
#include
#endif

#ifdef SHA1_STL_FUNCTIONS
#include
#endif

#ifdef _MSC_VER
#include
#endif

// You can define the endian mode in your files without modifying the SHA-1
// 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

// 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

#if defined(SHA1_HAS_TCHAR)
#include
#else
#ifdef _MSC_VER
#include
#else
#ifndef TCHAR
#define TCHAR char
#endif
#ifndef _T
#define _T(__x) (__x)
#define _tmain main
#define _tprintf printf
#define _getts gets
#define _tcslen strlen
#define _tfopen fopen
#define _tcscpy strcpy
#define _tcscat strcat
#define _sntprintf snprintf
#endif
#endif
#endif

// Fallback, if no 64-bit support
#ifndef _fseeki64
#define _fseeki64 fseek
#endif
#ifndef _ftelli64
#define _ftelli64 ftell
#endif

///////////////////////////////////////////////////////////////////////////
// Define variable types

#ifndef UINT_8
#ifdef _MSC_VER // Compiling with Microsoft compiler
#define UINT_8 unsigned __int8
#else // !_MSC_VER
#define UINT_8 unsigned char
#endif // _MSC_VER
#endif

#ifndef UINT_32
#ifdef _MSC_VER // Compiling with Microsoft compiler
#define UINT_32 unsigned __int32
#else // !_MSC_VER
#if (ULONG_MAX == 0xFFFFFFFF)
#define UINT_32 unsigned long
#else
#define UINT_32 unsigned int
#endif
#endif // _MSC_VER
#endif // UINT_32

#ifndef INT_64
#ifdef _MSC_VER // Compiling with Microsoft compiler
#define INT_64 __int64
#else // !_MSC_VER
#define INT_64 long long
#endif // _MSC_VER
#endif // INT_64

#ifndef UINT_64
#ifdef _MSC_VER // Compiling with Microsoft compiler
#define UINT_64 unsigned __int64
#else // !_MSC_VER
#define UINT_64 unsigned long long
#endif // _MSC_VER
#endif // UINT_64

///////////////////////////////////////////////////////////////////////////
// Declare SHA-1 workspace

typedef union
{
UINT_8 c[64];
UINT_32 l[16];
} SHA1_WORKSPACE_BLOCK;

class DLLPUBLIC CSHA1
{
public:
#ifdef SHA1_UTILITY_FUNCTIONS
// Different formats for ReportHash
enum REPORT_TYPE
{
REPORT_HEX = 0,
REPORT_DIGIT = 1,
REPORT_HEX_SHORT = 2
};
#endif

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

UINT_32 m_state[5];
UINT_32 m_count[2];
UINT_32 m_reserved0[1]; // Memory alignment padding
UINT_8 m_buffer[64];
UINT_8 m_digest[20];
UINT_32 m_reserved1[3]; // Memory alignment padding

void Reset();

// Update the hash value
void Update(const UINT_8* pbData, UINT_32 uLen);

#ifdef SHA1_UTILITY_FUNCTIONS
// Hash in file contents
bool HashFile(const TCHAR* tszFileName);
#endif

// Finalize hash, call before using ReportHash(Stl)
void Final();

#ifdef SHA1_UTILITY_FUNCTIONS
bool ReportHash(TCHAR* tszReport, REPORT_TYPE rtReportType = REPORT_HEX) const;
#endif

#ifdef SHA1_STL_FUNCTIONS
bool ReportHashStl(std::basic_string& strOut, REPORT_TYPE rtReportType =
REPORT_HEX) const;
#endif

bool GetHash(UINT_8* pbDest) const;

private:
// Private SHA-1 transformation
void Transform(UINT_32* pState, const UINT_8* pBuffer);

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

#endif // ___SHA1_HDR___

Автор: Димитър Минчев

Доктор по информатика и компютърни науки