[tor-bugs] #5696 [Tor Relay]: AESNI not in use with openssl 1.0.1 on tor 0.2.3.14-alpha

Mon Apr 30 14:34:59 UTC 2012

#5696: AESNI not in use with openssl 1.0.1 on tor 0.2.3.14-alpha
-------------------------+--------------------------------------------------
 Reporter:  cypherpunks  |          Owner:                     
     Type:  defect       |         Status:  new                
 Priority:  normal       |      Milestone:  Tor: 0.2.3.x-final 
Component:  Tor Relay    |        Version:  Tor: 0.2.3.14-alpha
 Keywords:  aesni        |         Parent:                     
   Points:               |   Actualpoints:                     
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Comment(by nickm):

 Hm.  So according to the openssl code in evp/e_aes.c, it really looks like
 AESNI _should_ be getting used where possible.  If you can use a debugger,
 could you please tell me the contents of (OPENSSL_ia32cap_P[1]) ?   If
 not, could somebody else with an AESNI-compatible chip have a look?

 (Looking at the code: when we call EVP_aes_128_ctr(), OpenSSL 1.0.1 calls
 {{{
 { return AESNI_CAPABLE?&aesni_##keylen##_##mode:&aes_##keylen##_##mode; }
 }}}

 And AESNI_CAPABLE is defined as:
 {{{
 #define AESNI_CAPABLE   (OPENSSL_ia32cap_P[1]&(1<<(57-32)))
 }}}

 Also, can anybody else with an aesni cpu confirm this?

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5696#comment:2>
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