Date: Thu, 28 Aug 2008 05:48:26 +0400 From: Solar Designer <solar@...nwall.com> To: john-users@...ts.openwall.com Subject: Re: HMAC-MD5 SSE2 fails under Cygwin On Tue, Aug 26, 2008 at 07:34:10PM -0400, Random Intentions wrote: > I think I've found an issue with a piece of the latest jumbo > patch that was posted, though I'm not sure how to fix it. Basically, > I'm doing a compilation under win32/cygwin of 184.108.40.206 with the jumbo > patch applied. Everything compiles clean, but if I use 'make > win32-cygwin-x86-sse2' to do the build, then run a 'john --test' it > fails here: > > Benchmarking: HMAC MD5 SSE2 [hmac-md5 SSE2]... 18682 [main] john 2540 _cygtls: > :handle_exceptions: Exception: STATUS_ACCESS_VIOLATION ... > Now, the same patched tree compiles and runs fine with SSE2 under > linux, and if I use the MMX make option under cygwin, it works fine as > well. So, it seems like something isn't happy with the SSE2 options? It is possible that Cygwin does not guarantee the proper 16-byte alignment for variables declared with gcc's "__attribute__ ((aligned(16)))" in hmacMD5_fmt.c. Are you getting compiler warnings about that? If so, I don't think either I or Simon (the author of that code) are going to fix it for Cygwin, such as by moving those variable declarations to an assembly source file, especially given that the same problem is present in many other C source files introduced with the jumbo patch when compiling for MMX/SSE2 targets. We just don't care about portability of the jumbo patch that much, at least not right now, especially given that anyone who runs into this problem can use a non-SSE2 target (slower code) to get around the problem. That said, I appreciate your reporting the problem. It is useful to know just how (not) portable the jumbo patch is. Also, it is possible that my guess above is wrong and the problem is in fact completely different (could as well be a bug in the code). Alexander -- 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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