Far from trying to calculate the overhead, I would try finding the lowest level function call to std::write or std::read and simply log the bytes written/read :) A good starting point would be BIO_write (crpyto/bio_lib.c) or SSL_write, then trace from there to find the write system call. Same thing goes for read. It shouldn't be too hard to find the std::read/write calls if you compile w/the -g flag. You could even set a breakpoint in a simple program to try it (break write ;)
Fred Crable -----Original Message----- From: Shashank Khanvilkar [mailto:[EMAIL PROTECTED] Sent: Monday, July 07, 2003 12:05 PM To: [EMAIL PROTECTED] Subject: Estimating the packet overhead imposed by SSL. Is there any way (or document) in which i can estimate the packet overhead added by SSL. Assume that i am sending 100 bytes of data (with no compression), using some symmetric cipher (say aes-128-cbc). In this case, how many more bytes of overhead will be introduced by the SSL layer (I guess the record layer). (I will appreciate if someone can provide a breakup). Will reading the SSLv3 spec help me in this (i tried to read it here http://wp.netscape.com/eng/ssl3/draft302.txt , but it seems that the draft has expired).. Any help is appreciated. Shashank ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
