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Rev: nettle/ChangeLog:1.132

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 2011-02-06  Niels Möller  <nisse@lysator.liu.se>
 
+       * Makefile.in (TARGETS): Added gcmdata.
+       (gcmdata): New rule.
+
+       Introduced 4-bit tables. Gives gmac performance of 45 cycles per
+       byte (still on intel x86_64).
+       * gcm.c (gcm_gf_shift): Renamed. Tweaked little-endian masks.
+       (gcm_rightshift): ... old name.
+       (gcm_gf_mul): New argument for the output. Added length argument
+       for one of the inputs (implicitly padding with zeros).
+       (shift_table): New table (in 4-bit and 8-bit versions), generated
+       by gcmdata.
+       (gcm_gf_shift_chunk): New function shifting 4 bits at
+       a time.
+       (gcm_gf_mul_chunk): New function processing 4 bits at a time.
+       (gcm_set_key): Generation of 4-bit key table.
+       (gcm_hash): Use tables, when available.
+
+       * gcmdata.c (main): New file.
+
        * gcm.c (gcm_rightshift): Moved the reduction of the shifted out
        bit here.
        (gcm_gf_mul): Updated for gcm_rightshift change. Improves gmac