Re: Problem while working on BlowFish Encryption using C++

[EMAIL PROTECTED] (alden) wrote in message news:<[EMAIL PROTECTED]>...
> I am new here.Can I know who is expert in C++ or Blowfish encryption??
> I need their help.
> 
> I'm currently working on the Blowfish encryption project using
> C++.I'm facing a problem.I wish to encrypt a file with unlimited length.
> For example,it encrypt first 5 character,send to a file.Then continue
> encrypt the next 5 character and send to the same file as previous.
> I try to use block cipher but fail to complete it.Anyone can help
> me,please??

The obvious flaw in this is that Blowfish encrypts 64 bits at one
time. 64 bits is 8 bytes, not 5 bytes. Therefore this method would
probably fail.

You should process 8 characters at one time (assuming 1 unsigned char
takes up 1 byte) using Blowfish. Convert them into 32-bit words XL and
XR, then encrypt those under Blowfish. Convert the 32-bit words back
into chars, and send them to the file.

--
Benjamin Choi