Commit 69fbc783 authored by Niels Möller's avatar Niels Möller
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*** empty log message ***

Rev: nettle/ChangeLog:1.132
parent 24df45cb
2011-02-06 Niels Mller <>
* (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
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