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MD5.cpp
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MD5.cpp
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/****************************************************************************
** Copyright (C) 2012 me and my shadow developers
**
**
** This file may be used under the terms of the GNU General Public
** License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of
** this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
** You should have received a copy of the GNU General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
**
****************************************************************************/
#include "MD5.h"
#ifdef WIN32
#include <windows.h>
typedef struct MD5_CTX {
ULONG i[2];
ULONG buf[4];
unsigned char in[64];
unsigned char digest[16];
} MD5_CTX;
typedef void (WINAPI* F_MD5Init)(MD5_CTX *context);
typedef void (WINAPI* F_MD5Update)(MD5_CTX *context, const unsigned char *input, unsigned int inlen);
typedef void (WINAPI* F_MD5Final)(MD5_CTX *context);
//first time calling API will be redirect to these functions
static void WINAPI myMD5Init(MD5_CTX *context);
static void WINAPI myMD5Update(MD5_CTX *context, const unsigned char *input, unsigned int inlen);
static void WINAPI myMD5Final(MD5_CTX *context);
static F_MD5Init MD5Init=myMD5Init;
static F_MD5Update MD5Update=myMD5Update;
static F_MD5Final MD5Final=myMD5Final;
#else
#include <openssl/md5.h>
#endif
#include <assert.h>
#include <string.h>
#ifdef WIN32
static void loadMD5Functions(){
HMODULE h;
h=LoadLibraryA("cryptdll.dll");
if(h!=NULL){
MD5Init=(F_MD5Init)GetProcAddress(h,"MD5Init");
MD5Update=(F_MD5Update)GetProcAddress(h,"MD5Update");
MD5Final=(F_MD5Final)GetProcAddress(h,"MD5Final");
if(MD5Init==NULL || MD5Update==NULL || MD5Final==NULL) FreeLibrary(h);
else return;
}
h=LoadLibraryA("advapi32.dll");
if(h!=NULL){
MD5Init=(F_MD5Init)GetProcAddress(h,"MD5Init");
MD5Update=(F_MD5Update)GetProcAddress(h,"MD5Update");
MD5Final=(F_MD5Final)GetProcAddress(h,"MD5Final");
if(MD5Init==NULL || MD5Update==NULL || MD5Final==NULL) FreeLibrary(h);
else return;
}
FatalAppExitA(-1,"Can't find MD5 functions!!!");
}
static void WINAPI myMD5Init(MD5_CTX *context){
loadMD5Functions();
MD5Init(context);
}
static void WINAPI myMD5Update(MD5_CTX *context, const unsigned char *input, unsigned int inlen){
loadMD5Functions();
MD5Update(context,input,inlen);
}
static void WINAPI myMD5Final(MD5_CTX *context){
loadMD5Functions();
MD5Final(context);
}
#endif
//compute the MD5 message digest of the n bytes at d and place it in md
//(which must have space for 16 bytes of output). If md is NULL,
//the digest is placed in a static array.
unsigned char *Md5::calc(const void *d, unsigned long n, unsigned char *md){
#ifdef WIN32
static MD5_CTX ctx;
MD5Init(&ctx);
MD5Update(&ctx,(const unsigned char*)d,n);
MD5Final(&ctx);
if(md){
memcpy(md,ctx.digest,16);
return md;
}else{
return ctx.digest;
}
#else
return MD5((const unsigned char*)d,n,md);
#endif
}
char *Md5::toString(unsigned char *md){
static char s[40];
const char* hex="0123456789abcdef";
for(int i=0;i<16;i++){
s[i*2]=hex[(md[i]&0xF0)>>4];
s[i*2+1]=hex[md[i]&0xF];
}
s[32]='\0';
return s;
}
//initializes the class for calculating MD5.
void Md5::init(){
//First check the size
assert(sizeof(MD5_CTX)<=MD5_CTX_SIZE);
#ifdef WIN32
MD5Init((MD5_CTX*)md5_ctx);
#else
MD5_Init((MD5_CTX*)md5_ctx);
#endif
}
//add chunks of the message to be hashed (len bytes at data).
void Md5::update(const void *data, unsigned long len){
//First check the size
assert(sizeof(MD5_CTX)<=MD5_CTX_SIZE);
#ifdef WIN32
MD5Update((MD5_CTX*)md5_ctx,(const unsigned char*)data,len);
#else
MD5_Update((MD5_CTX*)md5_ctx,data,len);
#endif
}
//finished the caluclation, places the message digest in md,
//which must have space for 16 bytes of output (or NULL).
unsigned char *Md5::final(unsigned char *md){
static unsigned char digest[16];
//First check the size
assert(sizeof(MD5_CTX)<=MD5_CTX_SIZE);
#ifdef WIN32
MD5_CTX *ctx=(MD5_CTX*)md5_ctx;
MD5Final(ctx);
if(md==NULL) md=digest;
memcpy(md,ctx->digest,16);
return md;
#else
if(md==NULL) md=digest;
MD5_Final(md,(MD5_CTX*)md5_ctx);
return md;
#endif
}

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