With encryption it is important to remember you're dealing with binary data. Encrypted blocks should be sent independantly, blocksize bytes at a time, or encapsulated in a header which describes the packet being sent. If there's not enough data to fill an entire block, padding should be used. You should probably use sysread and syswrite for the lowlevel socket operations.
If you're using a stateful network protocol like TCP, there shouldn't be any issues with receiving blocks of the stream out of order, which would mung CBC mode.
An ideal protocol would not require verification of sent and received blocks. If you absolutely must, though, use Digest::MD5 or Digest::SHA1 hashes of the _encrypted blocks_, not plaintext.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|
