Add Intel SSSE3 based vector permutation AES implementation
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Description

Add Intel SSSE3 based vector permutation AES implementation

* cipher/Makefile.am: Add 'rijndael-ssse3-amd64.c'.
* cipher/rijndael-internal.h (USE_SSSE3): New.
(RIJNDAEL_context_s) [USE_SSSE3]: Add 'use_ssse3'.
* cipher/rijndael-ssse3-amd64.c: New.
* cipher/rijndael.c [USE_SSSE3] (_gcry_aes_ssse3_do_setkey)
(_gcry_aes_ssse3_prepare_decryption, _gcry_aes_ssse3_encrypt)
(_gcry_aes_ssse3_decrypt, _gcry_aes_ssse3_cfb_enc)
(_gcry_aes_ssse3_cbc_enc, _gcry_aes_ssse3_ctr_enc)
(_gcry_aes_ssse3_cfb_dec, _gcry_aes_ssse3_cbc_dec): New.
(do_setkey): Add HWF check for SSSE3 and setup for SSSE3
implementation.
(prepare_decryption, _gcry_aes_cfb_enc, _gcry_aes_cbc_enc)
(_gcry_aes_ctr_enc, _gcry_aes_cfb_dec, _gcry_aes_cbc_dec): Add
selection for SSSE3 implementation.
* configure.ac [host=x86_64]: Add 'rijndael-ssse3-amd64.lo'.

This patch adds "AES with vector permutations" implementation by
Mike Hamburg. Public-domain source-code is available at:

http://crypto.stanford.edu/vpaes/

Benchmark on Intel Core2 T8100 (2.1Ghz, no turbo):

Old (AMD64 asm):
AES | nanosecs/byte mebibytes/sec cycles/byte

ECB enc |      8.79 ns/B     108.5 MiB/s     18.46 c/B
ECB dec |      9.07 ns/B     105.1 MiB/s     19.05 c/B
CBC enc |      7.77 ns/B     122.7 MiB/s     16.33 c/B
CBC dec |      7.74 ns/B     123.2 MiB/s     16.26 c/B
CFB enc |      7.88 ns/B     121.0 MiB/s     16.54 c/B
CFB dec |      7.56 ns/B     126.1 MiB/s     15.88 c/B
OFB enc |      9.02 ns/B     105.8 MiB/s     18.94 c/B
OFB dec |      9.07 ns/B     105.1 MiB/s     19.05 c/B
CTR enc |      7.80 ns/B     122.2 MiB/s     16.38 c/B
CTR dec |      7.81 ns/B     122.2 MiB/s     16.39 c/B

New (ssse3):
AES | nanosecs/byte mebibytes/sec cycles/byte

ECB enc |      5.77 ns/B     165.2 MiB/s     12.13 c/B
ECB dec |      7.13 ns/B     133.7 MiB/s     14.98 c/B
CBC enc |      5.27 ns/B     181.0 MiB/s     11.06 c/B
CBC dec |      6.39 ns/B     149.3 MiB/s     13.42 c/B
CFB enc |      5.27 ns/B     180.9 MiB/s     11.07 c/B
CFB dec |      5.28 ns/B     180.7 MiB/s     11.08 c/B
OFB enc |      6.11 ns/B     156.1 MiB/s     12.83 c/B
OFB dec |      6.13 ns/B     155.5 MiB/s     12.88 c/B
CTR enc |      5.26 ns/B     181.5 MiB/s     11.04 c/B
CTR dec |      5.24 ns/B     182.0 MiB/s     11.00 c/B

Benchmark on Intel i5-2450M (2.5Ghz, no turbo, aes-ni disabled):

Old (AMD64 asm):
AES | nanosecs/byte mebibytes/sec cycles/byte

ECB enc |      8.06 ns/B     118.3 MiB/s     20.15 c/B
ECB dec |      8.21 ns/B     116.1 MiB/s     20.53 c/B
CBC enc |      7.88 ns/B     121.1 MiB/s     19.69 c/B
CBC dec |      7.57 ns/B     126.0 MiB/s     18.92 c/B
CFB enc |      7.87 ns/B     121.2 MiB/s     19.67 c/B
CFB dec |      7.56 ns/B     126.2 MiB/s     18.89 c/B
OFB enc |      8.27 ns/B     115.3 MiB/s     20.67 c/B
OFB dec |      8.28 ns/B     115.1 MiB/s     20.71 c/B
CTR enc |      8.02 ns/B     119.0 MiB/s     20.04 c/B
CTR dec |      8.02 ns/B     118.9 MiB/s     20.05 c/B

New (ssse3):
AES | nanosecs/byte mebibytes/sec cycles/byte

ECB enc |      4.03 ns/B     236.6 MiB/s     10.07 c/B
ECB dec |      5.28 ns/B     180.8 MiB/s     13.19 c/B
CBC enc |      3.77 ns/B     252.7 MiB/s      9.43 c/B
CBC dec |      4.69 ns/B     203.3 MiB/s     11.73 c/B
CFB enc |      3.75 ns/B     254.3 MiB/s      9.37 c/B
CFB dec |      3.69 ns/B     258.6 MiB/s      9.22 c/B
OFB enc |      4.17 ns/B     228.7 MiB/s     10.43 c/B
OFB dec |      4.17 ns/B     228.7 MiB/s     10.42 c/B
CTR enc |      3.72 ns/B     256.5 MiB/s      9.30 c/B
CTR dec |      3.72 ns/B     256.1 MiB/s      9.31 c/B