使用windows的动态链接库advapi32.dll.
此动态链接库提供以下md5函数：
MD5Init(&ctx);
MD5Update(&ctx, buf, len);
MD5Final(&ctx);
具体使用：
定义的Ccommon类：
////////////////////////////////////////////////////////////// common.h
//globle define
#include <windows.h>
/* Data structure for MD5 (Message-Digest) computation */
typedef struct {
ULONG i[2]; /* number of _bits_ handled mod 2^64 */
ULONG buf[4]; /* scratch buffer */
unsigned char in[64]; /* input buffer */
unsigned char digest[16]; /* actual digest after MD5Final call */
} MD5_CTX;
#define MD5DIGESTLEN 16
#define PROTO_LIST(list) list
/*
* MTS: Each of these assumes MD5_CTX is locked against simultaneous use.
*/
typedef void (WINAPI* PMD5Init) PROTO_LIST ((MD5_CTX *));
typedef void (WINAPI* PMD5Update) PROTO_LIST ((MD5_CTX *, const unsigned char *, unsigned int));
typedef void (WINAPI* PMD5Final )PROTO_LIST ((MD5_CTX *));
//end globle define
class Ccommon
{
public:
Ccommon();
virtual ~Ccommon();
const char * md5(const char * str);
const char * Hex2ASC(const BYTE *Hex, int Len);
PMD5Init MD5Init;
PMD5Update MD5Update;
PMD5Final MD5Final;
};
///////////////////////////////////////////////////////////////////////////////////////////////////////////////end common.h
common实现:
//////////////////////////////////////////////////////////////////////////////////////////////////////////////common.cpp start
#include "common.h"
//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////
Ccommon::Ccommon()
{
}
Ccommon::~Ccommon()
{
}
const char * Ccommon::Hex2ASC(const BYTE *Hex, int Len)
{
static char ASC[4096 * 2];
int i;
for (i = 0; i < Len; i++)
{
ASC[i * 2] = "0123456789ABCDEF"[Hex[i] >> 4];
ASC[i * 2 + 1] = "0123456789ABCDEF"[Hex[i] & 0x0F];
}
ASC[i * 2] = '/0';
return ASC;
}
const char * Ccommon::md5(const char * str)
{
MD5_CTX ctx;
const unsigned char * buf = reinterpret_cast<const unsigned char *>(str);
int len = strlen(str);
HINSTANCE hDLL;
if ( (hDLL = LoadLibrary("advapi32.dll")) > 0 )
{
MD5Init = (PMD5Init)GetProcAddress(hDLL,"MD5Init");
MD5Update = (PMD5Update)GetProcAddress(hDLL,"MD5Update");
MD5Final = (PMD5Final)GetProcAddress(hDLL,"MD5Final");
MD5Init(&ctx);
MD5Update(&ctx, buf, len);
MD5Final(&ctx);
}
return Hex2ASC(ctx.digest, 16);
}
}
////////////////////////////////////////////////////////////////////////////////////////////////////// common.cpp end.