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C Loads one word, and adds it to the subkey. Uses T0
C AES_LOAD(SRC, KEY, REG)
define(<AES_LOAD>, <
ldrb $3, [$1], #+1
ldrb T0, [$1], #+1
orr $3, T0, lsl #8
ldrb T0, [$1], #+1
orr $3, T0, lsl #16
ldrb T0, [$1], #+1
orr $3, T0, lsl #24
ldr T0, [$2], #+4
eor $3, T0
>)
C Stores one word. Destroys input.
C AES_STORE(DST, X)
define(<AES_STORE>, <
strb $2, [$1], #+1
ror $2, $2, #8
strb $2, [$1], #+1
ror $2, $2, #8
strb $2, [$1], #+1
ror $2, $2, #8
strb $2, [$1], #+1
>)
C 53 instr.
C It's tempting to use eor with rotation, but that's slower.
C AES_ENCRYPT_ROUND(x0,x1,x2,x3,w0,w1,w2,w3,key)
define(<AES_ENCRYPT_ROUND>, <
uxtb T0, $1
ldr $5, [TABLE, T0, lsl #2]
uxtb T0, $2
ldr $6, [TABLE, T0, lsl #2]
uxtb T0, $3
ldr $7, [TABLE, T0, lsl #2]
uxtb T0, $4
ldr $8, [TABLE, T0, lsl #2]
uxtb T0, $2, ror #8
add TABLE, TABLE, #1024
ldr T0, [TABLE, T0, lsl #2]
eor $5, $5, T0
uxtb T0, $3, ror #8
ldr T0, [TABLE, T0, lsl #2]
eor $6, $6, T0
uxtb T0, $4, ror #8
ldr T0, [TABLE, T0, lsl #2]
eor $7, $7, T0
uxtb T0, $1, ror #8
ldr T0, [TABLE, T0, lsl #2]
eor $8, $8, T0
uxtb T0, $3, ror #16
add TABLE, TABLE, #1024
ldr T0, [TABLE, T0, lsl #2]
eor $5, $5, T0
uxtb T0, $4, ror #16
ldr T0, [TABLE, T0, lsl #2]
eor $6, $6, T0
uxtb T0, $1, ror #16
ldr T0, [TABLE, T0, lsl #2]
eor $7, $7, T0
uxtb T0, $2, ror #16
ldr T0, [TABLE, T0, lsl #2]
eor $8, $8, T0
uxtb T0, $4, ror #24
add TABLE, TABLE, #1024
ldr T0, [TABLE, T0, lsl #2]
eor $5, $5, T0
uxtb T0, $1, ror #24
ldr T0, [TABLE, T0, lsl #2]
eor $6, $6, T0
uxtb T0, $2, ror #24
ldr T0, [TABLE, T0, lsl #2]
eor $7, $7, T0
uxtb T0, $3, ror #24
ldr T0, [TABLE, T0, lsl #2]
ldm $9!, {$1,$2,$3,$4}
eor $8, $8, T0
sub TABLE, TABLE, #3072
eor $5, $5, $1
eor $6, $6, $2
eor $7, $7, $3
eor $8, $8, $4
>)
define(<AES_DECRYPT_ROUND>, <
uxtb T0, $1
ldr $5, [TABLE, T0, lsl #2]
uxtb T0, $2
ldr $6, [TABLE, T0, lsl #2]
uxtb T0, $3
ldr $7, [TABLE, T0, lsl #2]
uxtb T0, $4
ldr $8, [TABLE, T0, lsl #2]
uxtb T0, $4, ror #8
add TABLE, TABLE, #1024
ldr T0, [TABLE, T0, lsl #2]
eor $5, $5, T0
uxtb T0, $1, ror #8
ldr T0, [TABLE, T0, lsl #2]
eor $6, $6, T0
uxtb T0, $2, ror #8
ldr T0, [TABLE, T0, lsl #2]
eor $7, $7, T0
uxtb T0, $3, ror #8
ldr T0, [TABLE, T0, lsl #2]
eor $8, $8, T0
uxtb T0, $3, ror #16
add TABLE, TABLE, #1024
ldr T0, [TABLE, T0, lsl #2]
eor $5, $5, T0
uxtb T0, $4, ror #16
ldr T0, [TABLE, T0, lsl #2]
eor $6, $6, T0
uxtb T0, $1, ror #16
ldr T0, [TABLE, T0, lsl #2]
eor $7, $7, T0
uxtb T0, $2, ror #16
ldr T0, [TABLE, T0, lsl #2]
eor $8, $8, T0
uxtb T0, $2, ror #24
add TABLE, TABLE, #1024
ldr T0, [TABLE, T0, lsl #2]
eor $5, $5, T0
uxtb T0, $3, ror #24
ldr T0, [TABLE, T0, lsl #2]
eor $6, $6, T0
uxtb T0, $4, ror #24
ldr T0, [TABLE, T0, lsl #2]
eor $7, $7, T0
uxtb T0, $1, ror #24
ldr T0, [TABLE, T0, lsl #2]
ldm $9!, {$1,$2,$3,$4}
eor $8, $8, T0
sub TABLE, TABLE, #3072
eor $5, $5, $1
eor $6, $6, $2
eor $7, $7, $3
eor $8, $8, $4
>)
C AES_FINAL_ROUND(a,b,c,d,key,res)
define(<AES_FINAL_ROUND>, <
uxtb T0, $1
ldrb $6, [TABLE, T0]
uxtb T0, $2, ror #8
ldrb T0, [TABLE, T0]
eor $6, $6, T0, lsl #8
uxtb T0, $3, ror #16
ldrb T0, [TABLE, T0]
eor $6, $6, T0, lsl #16
uxtb T0, $4, ror #24
ldrb T0, [TABLE, T0]
eor $6, $6, T0, lsl #24
ldr T0, [$5], #+4
eor $6, T0
>)
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