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dnl AES_LOAD(a, b, c, d, src, key)
dnl Loads the next block of data from src, and add the subkey pointed
dnl to by key.
dnl Note that x86 allows unaligned accesses.
dnl Would it be preferable to interleave the loads and stores?
define(<AES_LOAD>, <
movl ($5),$1
movl 4($5),$2
movl 8($5),$3
movl 12($5),$4
xorl ($6),$1
xorl 4($6),$2
xorl 8($6),$3
xorl 12($6),$4>)dnl
dnl AES_STORE(a, b, c, d, key, dst)
dnl Adds the subkey to a, b, c, d,
dnl and stores the result in the area pointed to by dst.
dnl Note that x86 allows unaligned accesses.
dnl Would it be preferable to interleave the loads and stores?
define(<AES_STORE>, <
xorl ($5),$1
xorl 4($5),$2
xorl 8($5),$3
xorl 12($5),$4
movl $1,($6)
movl $2,4($6)
movl $3,8($6)
movl $4,12($6)>)dnl
dnl AES_ROUND(table,a,b,c,d,out,tmp)
dnl Computes one word of the AES round. Leaves result in $6.
define(<AES_ROUND>, <
movl $2, $7
andl <$>0xff, $7
movl AES_TABLE0 ($1, $7,4),$6
movl $3, $7
shrl <$>6,$7
andl <$>0x000003fc,$7 C clear all but offset bytes
xorl AES_TABLE1 ($1, $7),$6
movl $4,$7 C third one
shrl <$>14,$7
andl <$>0x000003fc,$7
xorl AES_TABLE2 ($1, $7),$6
movl $5,$7 C fourth one
shrl <$>22,$7
andl <$>0x000003fc,$7
xorl AES_TABLE3 ($1, $7),$6>)dnl
dnl AES_FINAL_ROUND(a, b, c, d, out, tmp)
dnl Computes one word of the final round. Leaves result in %edi.
dnl Note that we have to quote $ in constants.
define(<AES_FINAL_ROUND>, <
C FIXME: Perform substitution on least significant byte here,
C to save work later.
movl $1,$5
andl <$>0x000000ff,$5
movl $2,$6
andl <$>0x0000ff00,$6
orl $6, $5
movl $3,$6
andl <$>0x00ff0000,$6
orl $6, $5
movl $4,$6
andl <$>0xff000000,$6
orl $6, $5>)dnl
dnl AES_SUBST_BYTE(table, tmp)
dnl Substitutes the least significant byte of
dnl each of eax, ebx, ecx and edx, and also rotates
dnl the words one byte to the left.
dnl FIXME: AES_SBOX is zero. Any win by deleting the offset?
define(<AES_SUBST_BYTE>, <
movl %eax,$2
andl <$>0x000000ff,$2
movb AES_SBOX ($1, $2),%al
roll <$>8,%eax
movl %ebx,$2
andl <$>0x000000ff,$2
movb AES_SBOX ($1, $2),%bl
roll <$>8,%ebx
movl %ecx,$2
andl <$>0x000000ff,$2
movb AES_SBOX ($1, $2),%cl
roll <$>8,%ecx
movl %edx,$2
andl <$>0x000000ff,$2
movb AES_SBOX ($1, $2),%dl
roll <$>8,%edx>)dnl
C OFFSET(i)
C Expands to 4*i, or to the empty string if i is zero
define(<OFFSET>, <ifelse($1,0,,eval(4*$1))>)
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