* serpent.c (ROUNDS): Deleted macro.

(serpent_block_t): Deleted array typedef.
(KEYXOR): New macro, replacing BLOCK_XOR.
(BLOCK_COPY, SBOX, SBOX_INVERSE): Deleted macros.
(LINEAR_TRANSFORMATION): Use four separate arguments.
(LINEAR_TRANSFORMATION_INVERSE): Likewise.
(ROUND): Take separate arguments for all input and output words.
(ROUND_INVERSE): Likewise.
(ROUND_LAST, ROUND_FIRST_INVERSE): Deleted macros.
(serpent_set_key): Moved loop termination test.
(serpent_encrypt): Rewrote with unrolling of just eight rounds,
and without serpent_block_t.
(serpent_decrypt): Likewise.

Rev: nettle/ChangeLog:1.174
Rev: nettle/serpent.c:1.7