C計算檔案的MD5值

filemd5.c檔案

​

#include#include#include#define f(x, y, z) (((x) & (y)) | ((~x) & (z)))
#define g(x, y, z) (((x) & (z)) | ((y) & (~z)))
#define h(x, y, z) ((x) ^ (y) ^ (z))
#define i(x, y, z) ((y) ^ ((x) | (~z)))
#define rl(x, y) (((x) << (y)) | ((x) >> (32 - (y)))) //x向左迴圈移y位
#define pp(x) (x<<24)|((x<<8)&0xff0000)|((x>>8)&0xff00)|(x>>24) //將x高低位互換,例如pp(aabbccdd)=ddccbbaa
#define ff(a, b, c, d, x, s, ac) a = b + (rl((a + f(b,c,d) + x + ac),s))
#define gg(a, b, c, d, x, s, ac) a = b + (rl((a + g(b,c,d) + x + ac),s))
#define hh(a, b, c, d, x, s, ac) a = b + (rl((a + h(b,c,d) + x + ac),s))
#define ii(a, b, c, d, x, s, ac) a = b + (rl((a + i(b,c,d) + x + ac),s))
static unsigned a,b,c,d,a,b,c,d,i,len,flen[2],x[16]; //i臨時變數,len檔案長,flen[2]為64位二進位制表示的檔案初始長度
static char filename[200]; //檔名
static file *fp;
typedef struc***5_stru;
static void _md5(md5_stru *pmd5)
static void md5()
int calcfilemd5(const char* filename,unsigned char md5[16])
; unsigned int flen[2];
unsigned int len,temp;
int i;
if (!(fp=fopen(filename,"rb"))) 
//以二進位制開啟檔案
fseek(fp, 0, seek_end); //檔案指標轉到檔案末尾
if((len=ftell(fp))==-1) 
//ftell函式返回long,最大為2gb,超出返回-1
rewind(fp); //檔案指標復位到檔案頭
strumd5.a=0x67452301,strumd5.b=0xefcdab89,strumd5.c=0x98badcfe,strumd5.d=0x10325476; //初始化鏈結變數
flen[1]=len/0x20000000; //flen單位是bit
flen[0]=(len%0x20000000)*8;
memset(strumd5.x,0,64); //初始化x陣列為0
fread(strumd5.x,4,16,fp); //以4位元組為一組,讀取16組數
for(i=0;i55)
memcpy(strumd5.x+14,flen,8); //檔案末尾加入原檔案的bit長度
_md5(&strumd5);
fclose(fp);
//printf("md5 code:%08x%08x%08x%08x\n",pp(strumd5.a),pp(strumd5.b),pp(strumd5.c),pp(strumd5.d)); //高低位逆反輸出
//sprintf(md5buff,"%08x%08x%08x%08x", pp(strumd5.a), pp(strumd5.b), pp(strumd5.c), pp(strumd5.d))
i = 0;
temp = pp(strumd5.a);
md5[i++] = (temp >> 24 & 0xff);
md5[i++] = (temp >> 16 & 0xff);
md5[i++] = (temp >> 8 & 0xff);
md5[i++] = (temp >> 0 & 0xff);
temp = pp(strumd5.b);
md5[i++] = (temp >> 24 & 0xff);
md5[i++] = (temp >> 16 & 0xff);
md5[i++] = (temp >> 8 & 0xff);
md5[i++] = (temp >> 0 & 0xff);
temp = pp(strumd5.c);
md5[i++] = (temp >> 24 & 0xff);
md5[i++] = (temp >> 16 & 0xff);
md5[i++] = (temp >> 8 & 0xff);
md5[i++] = (temp >> 0 & 0xff);
temp = pp(strumd5.d);
md5[i++] = (temp >> 24 & 0xff);
md5[i++] = (temp >> 16 & 0xff);
md5[i++] = (temp >> 8 & 0xff);
md5[i++] = (temp >> 0 & 0xff);
return 0;
}​

#include #include #include static void printf_hexstream(unsigned char *pdata, int len, const char* strtag)

; int ret = 0;
int pos = 0;
for (i = 0; iif (strtag)
else
// printf("\r\n%s:%s\r\n",strtag,buff);} 
extern int calcfilemd5(const char* filename, unsigned char md5[16]);
void testfilemd5()
; printf("\r\n--------test file md5-----------\r\n");
rslt = calcfilemd5("hexeditor.dll",md5);
if (rslt == 0)
else }
int main(int argc, char *ar**)

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