First take on using AES-NI instructions

This first naive use of the new Intel AES-NI instructions boosts the
performance of AES on CPUs supporting this by 3 to 5 times.

Results from running
  ./benchmark --cipher-repetitions 10 --large-buffers  cipher aes
on a
  cpu family      : 6
  model           : 37
  model name      : Intel(R) Core(TM) i5 CPU         660  @ 3.33GHz
  stepping        : 2
  cpu MHz         : 3325.494
  cache size      : 4096 KB
  cpu cores       : 2

yields this:

    ECB/Stream         CBC             CFB             OFB             CTR
--------------- --------------- --------------- --------------- ---------------
  130ms   110ms   110ms   100ms   110ms   110ms   160ms   150ms   170ms   170ms
   40ms    40ms    20ms    30ms    30ms    20ms    70ms    70ms    80ms    80ms

The first line is with runtime switched off AES-NI instructions (don't
set use_aesni in do_setkey), the second with enabled AES-NI.  By
fixing the alignment, I hope to squeeze out a little more even with
this naive implementation.

1 files changed, 2 insertions, 0 deletions

diff --git a/NEWS b/NEWS
index 7dbb54ad..98484324 100644
--- a/NEWS
+++ b/NEWS
@@ -27,6 +27,8 @@ Noteworthy changes in version 1.5.x (unreleased)
 
  * gcry_mpi_cmp applied to opaque values has a defined semantic now.
 
+ * Uses the Intel AES-NI instructions if available.
+
  * Interface changes relative to the 1.4.2 release:
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  GCRY_CIPHER_MODE_AESWRAP   NEW.