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【C】破解zip密码
作者:Dezai.CN / 发布于2012/5/26/ 694
破解zip密码
#include <stdio.h>
#include <string.h></div>
<div>unsigned char dos_string[128];
unsigned char delete_file[128];
#define DWORD unsigned long
#define WORD unsigned int
#define BYTE unsigned char</div>
<div>define USGC unsigned char
#define USGI unsigned
#define USGL unsigned long</div>
<div>define MAXDIGHACK 8
#define GOOD_CRC32_RESIDUAL 0xdebb20e3L</div>
<div>USGL crctable[256]; // global accessible //
USGI crc2find; // crc 2 find //</div>
<div>BYTE sig[] = {0x50,0x4b,0x03,0x04};
BYTE error_sig[] ={'e','r','r','o','r','s','!'};</div>
<div>unsigned long crc32();
void generatetable();
unsigned char decrypt_byte();</div>
<div>
int maxdighack = MAXDIGHACK;</div>
<div></div>
<div>//unsigned char preamble[10];
//unsigned char postamble[10];</div>
<div>int ffflag=0;</div>
<div>
main(argc, argv)
int argc;
char *argv[];
{
 unsigned char passcode[25];
 unsigned char buffer[25];
 unsigned char lookfile[25];
 unsigned char inbuff[25];
 unsigned char zipname[25];
 FILE *zipfile;
 int end,i,j,skip,len;</div>
<div> printf("\nZipcrack V0.1b - (c)1991 by Mycal Johnson - <a href="mailto:mycal@netacsys.com\n\n">mycal@netacsys.com\n\n</a>");</div>
<div> if(argc==1)
 {
 printf("\n Usage: 'zipcrack zipfile crackfile'");
 printf("\n zipfile = filename.zip ");
 printf("\n crackfile = file in the zipfile to crack\n\n");
 exit(2);
 }
<div> i=strlen(argv[1]);
 if(i>8)
 {
 printf("\n Filename must be 8 characters or less, do not incude .zip extention \n\n");
 exit(2);
 }
 strcpy(zipname,argv[1]);
 strcat(zipname,".zip");
 i=strlen(argv[2]);
 if(i>12)
 {
 printf("\n Filename to hack cannot be more than 12 characters including extention\n\n");
 exit(2);
 }
 strcpy(lookfile,argv[2]);</div>
<div> strupr(lookfile);
 strupr(zipname);
 //
 // make unzip try string
 //
 strcpy(dos_string,"unzip ");
 strcat(dos_string,argv[1]);
 strcat(dos_string," ");
 strcat(dos_string,lookfile);
 strcat(dos_string," -s");</div>
<div> strcpy(delete_file,"del ");
 strcat(delete_file,lookfile);
 //
 // check to see if target already exists
 //
 if((zipfile = fopen(lookfile,"r+b")) != NULL)
 {
 close(zipfile);
 printf("\nWarning %s already exists on disk.",lookfile);
 printf("\n Delete this file and try again.");
 exit(1);
 }
<div>
 if ((zipfile = fopen(zipname,"r+b")) == NULL )
 {
 printf("fopen failed. Cannot find/open %s.\n",zipname);
 exit(2);
 }
<div> i = 0;
 end=0;
 //
 // Here we search for file to hack on inside the zip file. First we
 // look for the local file sig then we check to see if its our file.
 //
 while(!end)
 {
 if(fread(buffer, sizeof(char),1,zipfile))
 {
 if(buffer[0] == sig[i])
 i = i + 1;
 else
 i = 0;
 if (i == 4)
 { // sig is 4 digits
 len=strlen(lookfile);
 skip = 26;
 if(fseek(zipfile, (long)skip, SEEK_CUR)!=0)
 {
 printf("fseek fail\n");
 exit(1);
 }
 if(fread(inbuff, sizeof(char),len,zipfile))
 {
 if(!memcmp(lookfile,inbuff,len))
 end=1;
 else
 i=0;
 }
 else
 {
 printf("read failed\n");
 exit(1);
 }
 }
 }
 else
 end = 2; // end of file
 }
 //
 // We couldn't find the file to hack if end = 2;
 //
 if(end == 2) {
 printf("File to hack not in found in Zipfile.\n");
 exit(2);
 }
 //
 // Read encryption header
 //
 if(!fread(buffer, sizeof(char),12,zipfile))
 {
 printf("Cannot read from Zipfile. fread fail\n");
 exit(2);
 }
<div> skip = -(len+16+12); // - len of filename + crc offset + encript headder
 if(fseek(zipfile, (long)skip, SEEK_CUR)!=0)
 {
 printf("fseek fail\n");
 exit(1);
 }
 if(fread(inbuff, sizeof(char),4,zipfile))
 {
 printf(" crc from file = %x : %x \n",((inbuff[3]<<8)|inbuff[2]),
 ((inbuff[1]<<8)|inbuff[0]));
 crc2find = ((inbuff[3]<<8)|inbuff[2]);
 }
 else
 {
 printf("fread2 fail");
 exit(2);
 }
 close(zipfile);</div>
<div> buffer[12]=0;</div>
<div> if(crackzip(passcode,buffer))
 { // buffer contains encription header //
 // returns hacked key in passcode //
 printf("\nWe hack success!\n\nKey is '%s'\n\n",passcode);
 printf("Thanx to your pal <a href="mailto:mycal@netacsys.com\n">mycal@netacsys.com\n</a>");
 exit(0);
 }
 else
 {
 printf("\nBummer, I couldn't hack it.\n");
 exit(1);
 }
}
<div>
crackzip(passcode, buffer)
 char *passcode;
 char *buffer;
{
 unsigned long key[3];
 unsigned char hackbuff[19];
 unsigned char password[50];
 unsigned char dos_try[128];
 unsigned int i,end, result,slen;</div>
<div> generatetable(); // generate 32-bit crc table //
//
// Set password to 'a' and the rest nil, set up end flag
//
 end = 0;
 for(i=0;i<50;i++) // init password to nil //
 password[i]=0;
 strcpy(password,"a");
//
// this is where the main hack loop is, we loop here tell we crack the
// password or forever, whichever is first.
//
 while(!end){
 memcpy(hackbuff,buffer,15); // reset buffer to origin
 key[0] = 305419896L; // reset key to start
 key[1] = 591751049L;
 key[2] = 878082192L;
 //
 // initilize key with password
 //
 slen = strlen(password);
 for(i=0; i<slen;i++)
 update_keys(key,password[i]);
 //
 // try the decript
 //
 if(!decript_head(hackbuff,key))
 {
 //
 // no CRC match, get next password to try, try again
 //
 update_password(password);
 if(strlen(password)>maxdighack)
 {
 return(0);
 end=2;
 }
 }
 else
 {
 //
 // We have a CRC match, so lets try to unzip the file
 //
 printf(" -- possible password is %s. Trying it now... \n",password);
 strcpy(dos_try,dos_string);
 strcat(dos_try,password);
 strcat(dos_try," > zipcrack.err");
 result=system(dos_try);
 if(!chk_4_errors())
 {
 // we hack success!
 strcpy(passcode,password);
 return(1);
 }
 printf("...failed\n");
 system(delete_file);
 update_password(password);
 if(strlen(password)>maxdighack){
 return(0);
 end=2;
 }
 }
 }// end while //
}
<div>

//////////////////////////////////////////////////////////////////////////
//
// chk_4_errors() - search the zipcrack.err file for the error_sig -
// "error!". If found return 1 else return 0
//
/////////////////////////////////////////////////////////////////////////
int
chk_4_errors()
{
 FILE *errfile;
 int end;
 int i;
 char buffer[10];</div>
<div> if ((errfile = fopen("zipcrack.err","r+b")) == NULL )
 {
 printf("\nCannot find zipcrack.err file.");
 printf("\nCannot continue.\n");
 exit(1);
 }
<div> i=0;
 end=0;
 while(!end)
 {
 if(fread(buffer, sizeof(char),1,errfile))
 {
 if(buffer[0] == error_sig[i])
 i = i + 1;
 else
 i = 0;
 if (i == 7)
 { // sig is 4 digits
 close(errfile);
 return(1);
 }
 }
 else
 end=1;
 }
 close(errfile);
 return(0);
}
<div>//////////////////////////////////////////////////////////////////////////
// update_password(password) - we get the next password to try here.
// This is the routine you would modify to make a dictionary or
// other than sequential hack. Also you can modify the range
// of char's to try here.
///////////////////////////////////////////////////////////////////////
update_password(password)
char *password;
{
 int g,i,len,err;
 char newlen[12];</div>
<div> err=0;</div>
<div> len = strlen(password);
 i = len-1;
 g = 0;</div>
<div> while(!err){
 password[i] = password[i] + 1; // inc to next char in series
 if(password[i] > 'z') {
 password[i] = 'a';
 i = i - 1;
 g = g + 1;
 if(g==2)
 printf("password = %s \015",password);
 }else
 err = 1;</div>
<div> if(i<0) { // we need to increase the length by one
 // strcpy(newlen,preamble); // I was thinking about a pre and
 // postamble in case you knew the
 // first or las couple of letters
 // of the password
 strcpy(newlen,"a"); // new start of string //
 strcat(newlen,password);
 strcpy(password,newlen);
 err = 1;
 }
 }
}
<div>////////////////////////////////////////////////////////////////////////////
// decript_head(buffer,key) - this is where the actual work takes place,
// We decript the buffer with the key generated with our password and
// check if we have a CRC match, if we do return with a 1.
////////////////////////////////////////////////////////////////////////////
decript_head(buffer,key)
 unsigned char *buffer;
 unsigned long *key;
{
 int i;
 unsigned int crc1;
 char c;</div>
<div> for(i = 0; i<12 ; i++)
 {
 c = buffer[i] ^ decrypt_byte(key); /* buffer xor decrypt_byte */
 update_keys(key,c);
 buffer[i] = c;
 }
 crc1 = ((buffer[11]<<8)|(buffer[10]));</div>
<div> /* crc1 = ~crc1; */
 if(crc1 == crc2find)
 {
 printf("Yippi Ki-aye M*&!#R <a href="mailto:F*^@#R">F*^@#R</a> ");
 return(1);
 }
 return(0);
}
<div>
update_keys(key,val)
unsigned long *key;
char val;
{
 key[0] = crc32(key[0],val);
 key[1] = key[1] + (key[0] & 0x000000ff);
 key[1] = key[1] * 134775813 + 1;
 key[2] = crc32(key[2],(key[1] >> 24));
}
<div>
unsigned char
decrypt_byte(key)
 unsigned long *key;
{
 unsigned short temp;</div>
<div> temp = key[2] | 2;
 return((temp*(temp^1))>>8);
}
<div>
//
// cRc routine
//
unsigned long
crc32(oldcrc, newchar)
 USGL oldcrc;
 char newchar;
{
 int i,index;
 USGL Crc;</div>
<div> Crc = oldcrc;</div>
<div> index = ((Crc ^ newchar) & 0x000000ffL);
 Crc = ((Crc >> 8) & 0x00ffffffL) ^ crctable[index];</div>
<div> return Crc; /* return a 1's complement */
}
<div>
</div>
<div></div>
<div>void generatetable() /* generate the crc look-up table */
{
 union
 { USGI i;
 struct
 {
 USGI i1 :1; /* MSC low order bit */
 USGI i2 :1;
 USGI i3 :1;
 USGI i4 :1;
 USGI i5 :1;
 USGI i6 :1;
 USGI i7 :1;
 USGI i8 :1; /* MSC high order bit */
 USGI :8; /* unused bits */
 }bit;
 }iUn;</div>
<div> union
 { USGL entry;
 struct
 {
 USGI b1 :1; /* MSC low order bit */
 USGI b2 :1;
 USGI b3 :1;
 USGI b4 :1;
 USGI b5 :1;
 USGI b6 :1;
 USGI b7 :1;
 USGI b8 :1;
 USGI b9 :1;
 USGI b10:1;
 USGI b11:1;
 USGI b12:1;
 USGI b13:1;
 USGI b14:1;
 USGI b15:1;
 USGI b16:1;
 USGI b17:1;
 USGI b18:1;
 USGI b19:1;
 USGI b20:1;
 USGI b21:1;
 USGI b22:1;
 USGI b23:1;
 USGI b24:1;
 USGI b25:1;
 USGI b26:1;
 USGI b27:1;
 USGI b28:1;
 USGI b29:1;
 USGI b30:1;
 USGI b31:1;
 USGI b32:1; /* MSC high order bit */
 } entrybit;
 }entryun;</div>
<div> for (iUn.i = 0; iUn.i < 256; iUn.i++)
 {
 entryun.entry = 0; /* zero out the value */</div>
<div> entryun.entrybit.b32 = (iUn.bit.i2 ^ iUn.bit.i8);
 entryun.entrybit.b31 = (iUn.bit.i1 ^ iUn.bit.i2 ^
 iUn.bit.i7 ^ iUn.bit.i8);
 entryun.entrybit.b30 = (iUn.bit.i1 ^ iUn.bit.i2 ^
 iUn.bit.i6 ^ iUn.bit.i7 ^
 iUn.bit.i8);
 entryun.entrybit.b29 = (iUn.bit.i1 ^ iUn.bit.i5 ^
 iUn.bit.i6 ^ iUn.bit.i7);</div>
<div> entryun.entrybit.b28 = (iUn.bit.i2 ^ iUn.bit.i4 ^
 iUn.bit.i5 ^ iUn.bit.i6 ^
 iUn.bit.i8);
 entryun.entrybit.b27 = (iUn.bit.i1 ^ iUn.bit.i2 ^
 iUn.bit.i3 ^ iUn.bit.i4 ^
 iUn.bit.i5 ^ iUn.bit.i7 ^
 iUn.bit.i8);
 entryun.entrybit.b26 = (iUn.bit.i1 ^ iUn.bit.i2 ^
 iUn.bit.i3 ^ iUn.bit.i4 ^
 iUn.bit.i6 ^ iUn.bit.i7 );
 entryun.entrybit.b25 = (iUn.bit.i1 ^ iUn.bit.i3 ^
 iUn.bit.i5 ^ iUn.bit.i6 ^
 iUn.bit.i8);</div>
<div> entryun.entrybit.b24 = (iUn.bit.i4 ^ iUn.bit.i5 ^
 iUn.bit.i7 ^ iUn.bit.i8);
 entryun.entrybit.b23 = (iUn.bit.i3 ^ iUn.bit.i4 ^
 iUn.bit.i6 ^ iUn.bit.i7);
 entryun.entrybit.b22 = (iUn.bit.i3 ^ iUn.bit.i5 ^
 iUn.bit.i6 ^ iUn.bit.i8);
 entryun.entrybit.b21 = (iUn.bit.i4 ^ iUn.bit.i5 ^
 iUn.bit.i7 ^ iUn.bit.i8);</div>
<div> entryun.entrybit.b20 = (iUn.bit.i2 ^ iUn.bit.i3 ^
 iUn.bit.i4 ^ iUn.bit.i6 ^
 iUn.bit.i7 ^ iUn.bit.i8 );
 entryun.entrybit.b19 = (iUn.bit.i1 ^ iUn.bit.i2 ^
 iUn.bit.i3 ^ iUn.bit.i5 ^
 iUn.bit.i6 ^ iUn.bit.i7 );
 entryun.entrybit.b18 = (iUn.bit.i1 ^ iUn.bit.i2 ^
 iUn.bit.i4 ^ iUn.bit.i5 ^
 iUn.bit.i6 );
 entryun.entrybit.b17 = (iUn.bit.i1 ^ iUn.bit.i3 ^
 iUn.bit.i4 ^ iUn.bit.i5 );</div>
<div> entryun.entrybit.b16 = (iUn.bit.i3 ^ iUn.bit.i4 ^
 iUn.bit.i8);
 entryun.entrybit.b15 = (iUn.bit.i2 ^ iUn.bit.i3 ^
 iUn.bit.i7);
 entryun.entrybit.b14 = (iUn.bit.i1 ^ iUn.bit.i2 ^
 iUn.bit.i6);
 entryun.entrybit.b13 = (iUn.bit.i1 ^ iUn.bit.i5);</div>
<div> entryun.entrybit.b12 = (iUn.bit.i4);
 entryun.entrybit.b11 = (iUn.bit.i3);
 entryun.entrybit.b10 = (iUn.bit.i8);
 entryun.entrybit.b9 = (iUn.bit.i2 ^ iUn.bit.i7 ^
 iUn.bit.i8);</div>
<div> entryun.entrybit.b8 = (iUn.bit.i1 ^ iUn.bit.i6 ^
 iUn.bit.i7);
 entryun.entrybit.b7 = (iUn.bit.i5 ^ iUn.bit.i6 );
 entryun.entrybit.b6 = (iUn.bit.i2 ^ iUn.bit.i4 ^
 iUn.bit.i5 ^ iUn.bit.i8);
 entryun.entrybit.b5 = (iUn.bit.i1 ^ iUn.bit.i3 ^
 iUn.bit.i4 ^ iUn.bit.i7 );</div>
<div> entryun.entrybit.b4 = (iUn.bit.i2 ^ iUn.bit.i3 ^
 iUn.bit.i6);
 entryun.entrybit.b3 = (iUn.bit.i1 ^ iUn.bit.i2 ^
 iUn.bit.i5);
 entryun.entrybit.b2 = (iUn.bit.i1 ^ iUn.bit.i4);
 entryun.entrybit.b1 = (iUn.bit.i3);</div>
<div> crctable[iUn.i] = entryun.entry;
 }
}
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