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Nettle
nettle
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dbe7d8be
Commit
dbe7d8be
authored
Feb 06, 2011
by
Niels Möller
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Rev: nettle/ChangeLog:1.131
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dbe7d8be
2011-02-06 Niels Mller <nisse@lysator.liu.se>
* gcm.c (gcm_rightshift): Moved the reduction of the shifted out
bit here.
(gcm_gf_mul): Updated for gcm_rightshift change. Improves gmac
performance to 181 cycles/byte.
* gcm.c (gcm_gf_mul): Rewrote. Still uses the bitwise algorithm from the
specification, but with separate byte and bit loops. Improves gmac
performance a bit further, to 227 cycles/byte.
* gcm.c (gcm_rightshift): Complete rewrite, to use word rather
than byte operations. Improves gmac performance from 830 cycles /
byte to (still poor) 268 cycles per byte on intel x86_64.
(gcm_gf_mul): Rewrote. Still uses the bitwise algorithm from the
specification, but with separate byte and bit loops. Improves gmac
performance a bit further, to 227 cycles/byte.
2011-02-05 Niels Mller <nisse@lysator.liu.se>
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