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【C】使用CryptoAPI计算Hash值：MD5, SHA

作者:Dezai.CN / 发布于2012/7/10/ 636

使用CryptoAPI计算Hash值：MD5, SHA

#include "stdafx.h"</div>
<div>define _WIN32_WINNT 0x0400</div>
#include <tchar.h></div>
#include <wincrypt.h></div>
<div></div>
<div>// 计算Hash，成功返回0，失败返回GetLastError()</div>
<div>// CONST BYTE *pbData, // 输入数据</div>
<div>// DWORD dwDataLen, // 输入数据字节长度</div>
<div>// ALG_ID algId // Hash 算法：CALG_MD5,CALG_SHA</div>
<div>// LPTSTR pszHash, // 输出16进制Hash字符串，MD5长度为32+1, SHA长度为40+1</div>
<div>//</div>
<div>DWORD GetHash(CONST BYTE *pbData, DWORD dwDataLen, ALG_ID algId, LPTSTR pszHash)</div>
<div>{</div>
<div> DWORD dwReturn = 0;</div>
<div> HCRYPTPROV hProv;</div>
<div> if (!CryptAcquireContext(&hProv, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT))</div>
<div> return (dwReturn = GetLastError());</div>
<div></div>
<div> HCRYPTHASH hHash;</div>
<div> //Alg Id:CALG_MD5,CALG_SHA</div>
<div> if(!CryptCreateHash(hProv, algId, 0, 0, &hHash))</div>
<div> {</div>
<div> dwReturn = GetLastError();</div>
<div> CryptReleaseContext(hProv, 0);</div>
<div> return dwReturn;</div>
<div> }
<div></div>
<div> if(!CryptHashData(hHash, pbData, dwDataLen, 0))</div>
<div> {</div>
<div> dwReturn = GetLastError();</div>
<div> CryptDestroyHash(hHash);</div>
<div> CryptReleaseContext(hProv, 0);</div>
<div> return dwReturn;</div>
<div> }
<div></div>
<div> DWORD dwSize;</div>
<div> DWORD dwLen = sizeof(dwSize);</div>
<div> CryptGetHashParam(hHash, HP_HASHSIZE, (BYTE*)(&dwSize), &dwLen, 0);</div>
<div></div>
<div> BYTE* pHash = new BYTE[dwSize];</div>
<div> dwLen = dwSize;</div>
<div> CryptGetHashParam(hHash, HP_HASHVAL, pHash, &dwLen, 0);</div>
<div></div>
<div> lstrcpy(pszHash, _T(""));</div>
<div> TCHAR szTemp[3];</div>
<div> for (DWORD i = 0; i < dwLen; ++i)</div>
<div> {</div>
<div> //wsprintf(szTemp, _T("%X%X"), pHash[i] >> 4, pHash[i] & 0xf);</div>
<div> wsprintf(szTemp, "%02X", pHash[i]);</div>
<div> lstrcat(pszHash, szTemp);</div>
<div> }
<div> delete [] pHash;</div>
<div></div>
<div> CryptDestroyHash(hHash);</div>
<div> CryptReleaseContext(hProv, 0);</div>
<div> return dwReturn;</div>
<div>}
<div></div>
<div>//=======================================================</div>
<div>// Test</div>
<div>int HashTest()</div>
<div>{</div>
<div> TCHAR szStr[20] = {0};</div>
<div> TCHAR szHash[41] = {0};</div>
<div></div>
<div> strcpy(szStr,"测试MD5");</div>
<div> GetHash((BYTE*)szStr, strlen(szStr), CALG_MD5,szHash);</div>
<div> MessageBox(NULL, szHash, szStr, MB_OK);</div>
<div></div>
<div> strcpy(szStr,"测试SHA");</div>
<div> GetHash((BYTE*)szStr, strlen(szStr),CALG_SHA,szHash);</div>
<div> MessageBox(NULL, szHash, szStr, MB_OK);</div>
<div> return 0;</div>
<div>}

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　#include　　"stdafx.h"　

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