> > >> I am using a partly modified PKCS7 enc.c and dec.c for
> > >> encrypting and decrypting documents.
> > >> When encrypting an 8,5MB file it takes about 1 minute,
> > >> however when decrypting it the time runs up to 20 minutes.
> > >Which platform? Which compiler? What does './config -t' say?
> > './config -t' says:
> > Operating system: sun4u-sun-solaris2
> > gcc version egcs-2.90.x
> > Configuring for solaris-usparc-oldgcc
> I managed to reproduce it on 0.9.3[a] as this's what you must have. This
> -oldgcc thing was fixed and usparc was changed to sparcv9 in 0.9.4. I
> experience much bigger differences in execution times. I managed to
> ./crypto/pkc7/enc 12MB file in 8 seconds, while dec took over 8 minutes.
Well, what can I say? Here is the scenario:
- dec sucks the whole file into the memory!
- then it copies 4K to another buffer and *moves* the rest of the file
buffer allocated in the first step to the beginning of the buffer, i.e.
where those 4K just were;
- it then deciphers the 4K and writes clear text to the output;
- last two steps are executed in loop till data in the buffer is
exhausted;
What's the catch? Say file buffer is XMB. At first iteration it'll copy
XMB-4K or data, at second - XMB-8K, third - XMB-12K, and so on resulting
in what? 128*X*XMB moved around? So program spends ~96% (I profiled with
6MB large data file) doing nothing but exercising interface between CPU
and primary memory and ~3% - performing DES. Beautiful, huh?
Conclusion. crypto/pkc7/dec.c is probably not the way to do it. If they
insist it is, then crypto/bio/bss_mem.c:mem_read() is not the way to do
it.
> Did you try it with 0.9.4?
0.9.4 exhibits same behavior so don't bother...
Cheers. I.e. if you find anything cheerful about this:-) Andy.
P.S. All this bio code is dark forest for me. At least for this very
moment. If it needs to be fixed, I'm not the first in the queue.
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