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C Used as temporaries by the AES macros
define(<TMP1>, <%g1>)
define(<TMP2>, <%g2>)
define(<TMP3>, <%g3>)
C Loop invariants used by AES_ROUND
define(<T0>, <%o0>)
define(<T1>, <%o1>)
define(<T2>, <%o2>)
define(<T3>, <%o3>)
C AES_LOAD(i, src, key, res)
define(<AES_LOAD>, <
ldub [$2 + 4*$1], $4
ldub [$2 + 4*$1 + 1], TMP1
ldub [$2 + 4*$1 + 2], TMP2
sll TMP1, 8, TMP1
or $4, TMP1, $4
ldub [$2 + 4*$1+3], TMP1
sll TMP2, 16, TMP2
or $4, TMP2, $4
sll TMP1, 24, TMP1
C Get subkey
ld [$3 + 4*$1], TMP2
or $4, TMP1, $4
xor $4, TMP2, $4>)dnl
C AES_ROUND(i, a, b, c, d, key, res)
C Computes one word of the AES round
C FIXME: Could use registers pointing directly to the four tables
C FIXME: Needs better instruction scheduling, and perhaps more temporaries
C Alternatively, we can use a single table and some rotations
define(<AES_ROUND>, <
and $2, 0xff, TMP1 C 0
srl $3, 6, TMP2 C 1
sll TMP1, 2, TMP1 C 0
and TMP2, 0x3fc, TMP2 C 1
ld [T0 + TMP1], $7 C 0 E0
srl $4, 14, TMP1 C 2
ld [T1 + TMP2], TMP2 C 1
and TMP1, 0x3fc, TMP1 C 2
xor $7, TMP2, $7 C 1 E1
srl $5, 22, TMP2 C 3
ld [T2 + TMP1], TMP1 C 2
and TMP2, 0x3fc, TMP2 C 3
xor $7, TMP1, $7 C 2 E2
ld [$6 + 4*$1], TMP1 C 4
ld [T3 + TMP2], TMP2 C 3
xor $7, TMP1, $7 C 4 E4
xor $7, TMP2, $7 C 3 E3
>)dnl
C AES_FINAL_ROUND(i, T, a, b, c, d, key, dst)
C Compute one word in the final round function. Output is converted to
C octets and stored at dst. Relies on AES_SBOX being zero.
define(<AES_FINAL_ROUND>, <
C Load subkey
ld [$7 + 4*$1], TMP3
and $3, 0xff, TMP1 C 0
srl $4, 8, TMP2 C 1
ldub [T + TMP1], TMP1 C 0
and TMP2, 0xff, TMP2 C 1
xor TMP3, TMP1, TMP1 C 0
ldub [T + TMP2], TMP2 C 1
stb TMP1, [$8 + 4*$1] C 0 E0
srl $5, 16, TMP1 C 2
srl TMP3, 8, TMP3 C 1
and TMP1, 0xff, TMP1 C 2
xor TMP3, TMP2, TMP2 C 1
ldub [T + TMP1], TMP1 C 2
stb TMP2, [$8 + 4*$1 + 1] C 1 E1
srl $6, 24, TMP2 C 3
srl TMP3, 8, TMP3 C 2
ldub [T + TMP2], TMP2 C 3
xor TMP3, TMP1, TMP1 C 2
srl TMP3, 8, TMP3 C 3
stb TMP1, [$8 + 4*$1 + 2] C 2 E2
xor TMP3, TMP2, TMP2 C 3
stb TMP2, [$8 + 4*$1 + 3] C 3 E3
>)
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