#keywords C++,cryptohash.h,Usage,SHA-1,MD5

[[TableOfContents]]

== cryptohash ==
Microsoft Cryptographic Provider를 쉽게 사용할 수 있는 헬퍼 템플릿 클래스.

attachment:cryptohash.h
{{{#!gcode
/*
* Authod: Marius Bancila (http://mariusbancila.ro)
* License: Code Project Open License
* Disclaimer: The software is provided "as-is". No claim of suitability, guarantee, or any warranty whatsoever is provided.
* Published: 19.09.2012
*/

#pragma once

#include <Windows.h>
#include <WinCrypt.h>
#pragma comment(lib, "Advapi32.lib")
...
}}}

== Usage ==
=== SHA-1 ===
{{{#!gcode
	CString strMsg("ABCDE");
	CString strHash;
	CT2CA pszConvertedAnsiString(strMsg);

	string msg(pszConvertedAnsiString);
	crypto::sha1_helper_t hash_helper;
	string hash = hash_helper.hexdigesttext(msg); 

	strHash.Format(L"Result= %S", hash.c_str());
	OutputDebugString(strHash);
}}}
----
{{{
Result= 7be07aaf460d593a323d0db33da05b64bfdcb3a5
}}}

=== hexdigestfile ===
{{{#!gcode
	CString strFilename("C:\\test_file.exe");
	CString strHash;
	CT2CA pszConvertedAnsiString(strFilename);

	string target(pszConvertedAnsiString);
	crypto::sha1_helper_t hash_helper;
	string hash = hash_helper.hexdigestfile(target.c_str());
	if (hash.empty())
	{
		CString str;
		str.Format(L"SHA1 HASH Error code: %d; Error message: %S", 
			hash_helper.lasterror().errorCode, 
			hash_helper.lasterror().errorMessage.c_str());
		OutputDebugString(str);
		return FALSE;
	}

	strHash.Format(_T("Result= %S"), hash.c_str());
	OutputDebugString(strHash);
}}}
----
{{{
Result= a735aff97994ad5ec4db1762697cc7faeff3a2f0
}}}

=== SHA-256 ===
알고리즘 추가 하려면 다음을 참조하여 패치한다.
{{{#!gcode
cryptohash.h
***************
*** 91,98 ****
  			if(!::CryptAcquireContext(
  				&m_hCryptProv, 
  				NULL, 
! 				NULL, 
! 				PROV_RSA_FULL, 
  				CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) 
  			{
  				m_lasterror = errorinfo_t(GetLastError(), "Failed to acquire cryptographic context.");
--- 91,98 ----
  			if(!::CryptAcquireContext(
  				&m_hCryptProv, 
  				NULL, 
! 				MS_ENH_RSA_AES_PROV, 
! 				PROV_RSA_AES, 
  				CRYPT_VERIFYCONTEXT | CRYPT_MACHINE_KEYSET)) 
  			{
  				m_lasterror = errorinfo_t(GetLastError(), "Failed to acquire cryptographic context.");
***************
*** 301,309 ****
--- 301,311 ----
  	typedef cryptohash_t<CALG_MD4> md4_t;
  	typedef cryptohash_t<CALG_MD5> md5_t;
  	typedef cryptohash_t<CALG_SHA1> sha1_t;
+ 	typedef cryptohash_t<CALG_SHA_256> sha256_t;
  
  	typedef cryptohash_helper_t<CALG_MD2> md2_helper_t;
  	typedef cryptohash_helper_t<CALG_MD4> md4_helper_t;
  	typedef cryptohash_helper_t<CALG_MD5> md5_helper_t;
  	typedef cryptohash_helper_t<CALG_SHA1> sha1_helper_t;
+ 	typedef cryptohash_helper_t<CALG_SHA_256> sha256_helper_t;
  }
}}}

{{{#!gcode
	string msg("...");
	crypto::sha256_helper_t hash_helper;
	string hash = hash_helper.hexdigesttext(msg, TRUE);
}}}