[tor-bugs] #5406 [Tor Relay]: Use EVP_aes_128_ctr() on OpenSSL >= 1.0.1

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#5406: Use EVP_aes_128_ctr() on OpenSSL >= 1.0.1
-------------------------+--------------------------------------------------
 Reporter:  nickm        |          Owner:                    
     Type:  enhancement  |         Status:  needs_review      
 Priority:  normal       |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Relay    |        Version:                    
 Keywords:               |         Parent:                    
   Points:               |   Actualpoints:                    
-------------------------+--------------------------------------------------
Changes (by nickm):

  * status:  new => needs_review


Comment:

 See branch openssl101_aes_ctr in my public repository.  It gets a 3.3x
 aes-ctr speedup on my desktop, which doesn't even have AESNI support.

 This branch also makes aesni get used on OpenSSL 1.0.1 (when it's
 supported), and refactors the crypto_cipher_t setup to be less error-
 prone.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/5406#comment:1>
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