Hi devendra, it's not necessary to wrap around the characters in caeser cipher by taking a modulus like you pointed out, there are many variants of it. Anyways my actual problem is that the encrypted data is not being written into the file whereas if I don't make a call to the encrypt function then the contents are written perfectly to the files. On 5:25pm, Fri 30-Jan-2015 devendra.aaru <devendra.aaru@gmail.com> wrote:
On Fri, Jan 30, 2015 at 6:48 AM, Kunal Baweja <bawejakunal15@gmail.com> 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;
printk(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.
Thanks
*Kunal Baweja*
Undergraduate B.E. (Hons.) Computer Science Birla Institute Of Technology & Science, Pilani K.K. Birla Goa Campus +91 9049655665
On Fri, Jan 30, 2015 at 4:03 PM, Saket Sinha <saket.sinha89@gmail.com> wrote:
HI,
Kindly refer the following link that implements a minimal encryption over wrapfs. https://github.com/piekill/wrapfs
Go through the wrapfs_encrypt in wrapfs_readpage and wrapfs_decrypt in wrapfs_writepage.
Regards, Saket Sinha
On Fri, Jan 30, 2015 at 3:56 PM, Kunal Baweja <bawejakunal15@gmail.com> wrote:
Hi, I am currently working on implementing a simple encrypted file system using a stackable file system WrapFS <http://wrapfs.filesystems.org/>. In order to do so, as I read in the WrapFS mailing list <http://www.fsl.cs.sunysb.edu/pipermail/wrapfs/2011-November/000058.html> one needs to implement address space operations, which I have done and posted on my github at this link <https://github.com/bawejakunal/wrapfs-addresspace-operations/blob/master/mma...> 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. Please guide where am I going wrong in modifying the data to be written and what could be the best way to decrypt it ?
Thanks
*Kunal Baweja*
Undergraduate B.E. (Hons.) Computer Science Birla Institute Of Technology & Science, Pilani K.K. Birla Goa Campus +91 9049655665
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