Date: Sat, 30 Aug 2008 06:50:23 +0400 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: HMAC-MD5 SSE2 fails under Cygwin On Thu, Aug 28, 2008 at 03:42:26PM -0400, Random Intentions wrote: > Solar - the compilation does produce warnings as follows: > > MD5_std.c:27: warning: alignment of 'MD5_std_all' is greater than > maximum object file alignment. Using 16 ... Well, 16-byte alignment is sufficient for the SSE2 code to work, and in fact hmacMD5_fmt.c does not even try to request anything larger than 16. However, I am unsure whether the linker actually guarantees 16-byte alignment for sections or not. With older versions of Cygwin, it did not even guarantee 8-byte alignment, which was/is needed for optimal performance with the MMX code, and ALIGN_FIX in some *.S files is a workaround for that (to be manually enabled on "unlucky" builds). I don't know if Cygwin has since been fixed, and to what extent. To test the "alignment theory", please add the following line: fprintf(stderr, "opad @ %p\n", opad); into hmacmd5_init(). What does it print? If the number (address) ends in a "0", we're fine (and the problem is likely different). However, I suspect that on your non-working build it'd end in "8" (or maybe even in "4" or "c"). Alexander P.S. Please avoid over-quoting. Specifically, please make sure you don't quote the mailing list manager's automated unsubscribe notice, as well as another person's signature. Although I have tolerated over-quoting in some recent messages, which I approved, I am starting to reject this kind of messages again. I have already rejected another message by Random Intentions for that reason. -- To unsubscribe, e-mail john-users-unsubscribe@...ts.openwall.com and reply to the automated confirmation request that will be sent to you.
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