No, I wasn't confusing block size with key size. I did say plaintext size of 16 :-) Are you saying that AES192 and AES256 will not work in CFB mode? Is the same true for ECB, CBC and OFB? I have been using CFB, ECB amd CBC with all 3 key sizes for some time and had no apparent problem. Have I just been lucky? Chris Brook
-----Original Message----- From: Richard Levitte - VMS Whacker [mailto:[EMAIL PROTECTED]] Sent: Monday, October 07, 2002 6:11 PM To: [EMAIL PROTECTED] Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED] Subject: Re: NIST AES Validation In message <002201c26e4b$7d3568d0$[EMAIL PROTECTED]> on Mon, 7 Oct 2002 17:50:00 -0400, "Chris Brook" <[EMAIL PROTECTED]> said: cbrook> I agree that CFB1 and CFB8 are not too useful. But I presume cbrook> that CFB128, CFB192 and CFB256 with plaintext sizes of 16 cbrook> octets or greater should be OK? Only AES CFB-128 is implemented, as I said. CFB-192 and CFB-256 makes me think you're mixing up block size (which is *always* 128 bits for AES) with key size (which can 128, 192 or 256 bits, as defined currently, although the algorithm is allegedly designed for any size key). You're not the first to mix that up, and you will probably not be the last either. -- Richard Levitte \ Spannv�gen 38, II \ [EMAIL PROTECTED] Redakteur@Stacken \ S-168 35 BROMMA \ T: +46-8-26 52 47 \ SWEDEN \ or +46-708-26 53 44 Procurator Odiosus Ex Infernis -- [EMAIL PROTECTED] Member of the OpenSSL development team: http://www.openssl.org/ Unsolicited commercial email is subject to an archival fee of $400. See <http://www.stacken.kth.se/~levitte/mail/> for more info. ______________________________________________________________________ OpenSSL Project http://www.openssl.org Development Mailing List [EMAIL PROTECTED] Automated List Manager [EMAIL PROTECTED]
