Thread: Code for Decryption

Hi Guys !

i had a problem which i have solved but not sure why it works like this

Import java.io.*; 
Public class Decrypt{ 	
Public static void main(String[] args){ 	
Try { 	
FileInputStream input= new FileInputStream (new file(“path/filename.enc”)); 	
FileOutputStream output= new FileOutputStream(new File (“path/file2.txt”)); 	
 
Boolean eof=false; 	
int b=-1; 
int EncryptedValue=0xD397B428; 
int mulValue=0x41C64E6D; 
int addValue=0x3039; 
 
input.read(); 
input.read();
input.read();
input.read();
input.read();
input.read();
input.read();
input.read();
 
While(!eof){  
b=input.read(); 
if(b==-1){ 
eof=true; 
} Else {
EncryptedValue=EncryptedValue*mulValue; 
EncryptedValue=Encrypted+addValue; 
output.write(b^magicValue); 
System.out.println(integer.toHexString(b));
}
} 
Output.close(); 
Input.close();
} 
Catch(Exception e){ 
System.out.println(e.getMessage());
}
}
}

i don't understand why i have to write

 input.read ();

eight times to correctly decrypt the file?

can anyone explain??

Regards,

Ewa

Does this program compile correctly?
And after fixing the code, i commented all the 8 lines (input.read()) and it worked exactly similar as it worked before. I didn't find any problem.

The 8 read() statements read and ignore 8 bytes from the file. What are in those 8 bytes that you can ignore them?
Do you have a definition of what each byte in the enc file contains?