Re: cvs commit: openssl/crypto/bn bn_mul.c

[Richard Levitte - VMS Whacker]

From: [EMAIL PROTECTED]

levitte>   The test results show a performance that very closely
levitte>   matches the original code from before my constification.
levitte>   This may seem like a very small win from a performance
levitte>   point of view, but if one remembers that the variants of
levitte>   bn_cmp_words(), bn_add_words() and bn_sub_words() are not
levitte>   at all optimized for the moment (and there's no
levitte>   corresponding assembler code), and that their use may be
levitte>   just as non-optimal, I'm pretty confident there are
levitte>   possibilities...

If you're interested in numbers, this is the final result of 'openssl
speed rsa' in the ASN1 branch (it contains the non-constified BIGNUM
code):

                  sign    verify    sign/s verify/s
rsa  512 bits   0.0052s   0.0005s    191.9   1951.7
rsa 1024 bits   0.0282s   0.0015s     35.4    654.8
rsa 2048 bits   0.1739s   0.0052s      5.7    192.8
rsa 4096 bits   1.1811s   0.0181s      0.8     55.1

and this is with the code that I just commited:

                  sign    verify    sign/s verify/s
rsa  512 bits   0.0052s   0.0005s    193.4   1955.7
rsa 1024 bits   0.0280s   0.0015s     35.7    654.0
rsa 2048 bits   0.1733s   0.0052s      5.8    193.5
rsa 4096 bits   1.1811s   0.0181s      0.8     55.2

-- 
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