On Fri, Jan 30, 2015 at 6:48 AM, Kunal Baweja <bawejakunal15@xxxxxxxxx> wrote:
Yeah I was trying something similar only but with a much simpler Caeser cipher function of my own written as below:
void encrypt(char *data, char *encrypted, size_t size)
{
unsigned int i;
for(i=0;i<(unsigned int)size;i++)
encrypted[i] = data[i] + 3;
This is not caesar's cipher. If your buffer contains alphabets then only you can apply caesar cipher.
It should be something like
encrypted[i] = (data[i] - 3) % 26;
Thanksprintk(KERN_INFO "%s",encrypted);
return;
}So in the given code wherever u see the calls to wrapfs_encrypt, I have replaced with my simpler encryption function.But I am not able to figure out why calling this function creates a problem, the printk() statement inside the function shows me the correctly encrypted contents but the file is still blank.Kunal BawejaUndergraduate B.E. (Hons.) Computer ScienceBirla Institute Of Technology & Science, PilaniK.K. Birla Goa Campus+91 9049655665On Fri, Jan 30, 2015 at 4:03 PM, Saket Sinha <saket.sinha89@xxxxxxxxx> wrote:HI,Kindly refer the following link that implements a minimal encryption over wrapfs.https://github.com/piekill/wrapfsGo through the wrapfs_encrypt in wrapfs_readpage and wrapfs_decrypt in wrapfs_writepage.Regards,Saket SinhaOn Fri, Jan 30, 2015 at 3:56 PM, Kunal Baweja <bawejakunal15@xxxxxxxxx> wrote:_______________________________________________ThanksPlease guide where am I going wrong in modifying the data to be written and what could be the best way to decrypt it ?Hi,I am currently working on implementing a simple encrypted file system using a stackable file system WrapFS. In order to do so, as I read in the WrapFS mailing list one needs to implement address space operations, which I have done and posted on my github at this link and it works fine. But now when I am trying to modify the data before being written in wrapfs_lower() function I get a blank output in files written out.Kunal BawejaUndergraduate B.E. (Hons.) Computer ScienceBirla Institute Of Technology & Science, PilaniK.K. Birla Goa Campus
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