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f1600_avr.S
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f1600_avr.S
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// f1600_avr.S
// 2018-06-28 Markku-Juhani O. Saarinen <[email protected]>
// (c) 2018 Copyright Teserakt AG
__zero_reg__ = 1
.text
// The C call convention with AVR is that:
// R2 - R17, R28, R29 are call-saved
// R18 - R27, R30, R31 are call-globbered
// Prototype:
// void keccak_f1600(uint8_t st[240], uint8_t r)
.global keccak_f1600
.type keccak_f1600, @function
keccak_f1600:
push r6
push r7
push r8
push r9
push r10
push r11
push r12
push r13
push r14
push r15
push r16
push r17
ldi xl, lo8(rconst) // round constant
ldi xh, hi8(rconst)
.iter:
movw z, r24 // input pointer r25:r24
// ---- Theta transform ----
clr zl // xor everything at (z+200..z+239)
.xorz1:
ld r6, z
ldd r0, z + 40
eor r6, r0
ldd r7, z + 1
ldd r0, z + 41
eor r7, r0
ldd r8, z + 2
ldd r0, z + 42
eor r8, r0
ldd r9, z + 3
ldd r0, z + 43
eor r9, r0
subi zl, -80
ld r0, z
eor r6, r0
ldd r0, z + 40
eor r6, r0
ldd r0, z + 1
eor r7, r0
ldd r0, z + 41
eor r7, r0
ldd r0, z + 2
eor r8, r0
ldd r0, z + 42
eor r8, r0
ldd r0, z + 3
eor r9, r0
ldd r0, z + 43
eor r9, r0
subi zl, -80
ld r0, z
eor r6, r0
std z + 40, r6
ldd r0, z + 1
eor r7, r0
std z + 41, r7
ldd r0, z + 2
eor r8, r0
std z + 42, r8
ldd r0, z + 3
eor r9, r0
std z + 43, r9
subi zl, 156
cpi zl, 40
brne .xorz1
ldi zl, 200 + 4 * 8
rcall .zget64a
ldi zl, 200 + 1 * 8
rcall .zget64b
rcall .rotbxa
ldi zl, 0 * 8
rcall .xorz2
rcall .movab
ldi zl, 200 + 2 * 8
rcall .zget64a
rcall .rotbxa
ldi zl, 3 * 8
rcall .xorz2
rcall .movab
ldi zl, 200 + 0 * 8
rcall .zget64a
rcall .rotbxa
ldi zl, 1 * 8
rcall .xorz2
rcall .movab
ldi zl, 200 + 3 * 8
rcall .zget64a
rcall .rotbxa
ldi zl, 4 * 8
rcall .xorz2
rcall .movab
ldi zl, 200 + 1 * 8
rcall .zget64a
rcall .rotbxa
ldi zl, 2 * 8
rcall .xorz2
// ---- Rho and Pi transforms ----
ldi zl, 1 * 8
rcall .zget64b
rcall .rotl1 // <<< 1
ldi zl, 10 * 8
rcall .zswp64b
rcall .rotl3 // <<< 3
ldi zl, 7 * 8
rcall .zswp64b
rcall .rotr2 // <<< 6
rcall .rotl8
ldi zl, 11 * 8
rcall .zswp64
rcall .rotl2 // <<< 10
rcall .rotl8
ldi zl, 17 * 8
rcall .zswp64
rcall .rotr1 // <<< 15
rcall .rotl16
ldi zl, 18 * 8
rcall .zswp64
rcall .rotr3 // <<< 21
rcall .rotl24
ldi zl, 3 * 8
rcall .zswp64
rcall .rotl2 // <<< 28
rcall .rotl2
rcall .rotl24
ldi zl, 5 * 8
rcall .zswp64
rcall .rotl2 // <<< 36
rcall .rotl2
rcall .rotl32
ldi zl, 16 * 8
rcall .zswp64
rcall .rotr3 // <<< 45
rcall .rotr16
ldi zl, 8 * 8
rcall .zswp64
rcall .rotr1 // <<< 55
rcall .rotr8
ldi zl, 21 * 8
rcall .zswp64
rcall .rotl2 // <<< 2
ldi zl, 24 * 8
rcall .zswp64b
rcall .rotr2 // <<< 14
rcall .rotl16
ldi zl, 4 * 8
rcall .zswp64
rcall .rotl3 // <<< 27
rcall .rotl24
ldi zl, 15 * 8
rcall .zswp64
rcall .rotl1 // <<< 41
rcall .rotr24
ldi zl, 23 * 8
rcall .zswp64
rcall .rotr8 // <<< 56
ldi zl, 19 * 8
rcall .zswp64
rcall .rotl8 // <<< 8
ldi zl, 13 * 8
rcall .zswp64
rcall .rotl1 // <<< 25
rcall .rotl24
ldi zl, 12 * 8
rcall .zswp64
rcall .rotl3 // <<< 43
rcall .rotr24
ldi zl, 2 * 8
rcall .zswp64
rcall .rotr2 // <<< 62
ldi zl, 20 * 8
rcall .zswp64b
rcall .rotl2 // <<< 18
rcall .rotl16
ldi zl, 14 * 8
rcall .zswp64
rcall .rotr1 // <<< 39
rcall .rotr24
ldi zl, 22 * 8
rcall .zswp64
rcall .rotr3 // <<< 61
ldi zl, 9 * 8
rcall .zswp64b
rcall .rotl2 // <<< 20
rcall .rotl2
rcall .rotl16
ldi zl, 6 * 8
rcall .zswp64
rcall .rotl2 // <<< 44
rcall .rotl2
rcall .rotr24
ldi zl, 1 * 8
rcall .zput64a
// ---- Chi transform ----
clr zl
.nonl2:
ldi r21, 8
.nonl1:
ld r11, z
ldd r12, z + 8
ldd r13, z + 16
ldd r14, z + 24
ldd r15, z + 32
ldi r16, 0xFF
eor r16, r12
and r16, r13
eor r16, r11
ldi r17, 0xFF
eor r17, r13
and r17, r14
eor r17, r12
ldi r18, 0xFF
eor r18, r14
and r18, r15
eor r18, r13
ldi r19, 0xFF
eor r19, r15
and r19, r11
eor r19, r14
ldi r20, 0xFF
eor r20, r11
and r20, r12
eor r20, r15
std z + 8, r17
std z + 16, r18
std z + 24, r19
std z + 32, r20
st z+, r16
dec r21
brne .nonl1
subi zl, -32
cpi zl, 200
brlo .nonl2
// ---- Iota ----
movw z, r24
ld r21, x+ // "compressed" round constant
ldi r20, 0x8F
and r20, r21
ld r19, z
eor r19, r20
st z, r19
ldi r20, 0x10
and r20, r21
breq .bit4z
ldd r19, z + 1
subi r19, 0x80
std z + 1, r19
.bit4z: ldi r20, 0x20
and r20, r21
breq .bit5z
ldd r19, z + 3
subi r19, 0x80
std z + 3, r19
.bit5z: ldi r20, 0x40
and r20, r21
breq .bit6z
ldd r19, z + 7
subi r19, 0x80
std z + 7, r19
.bit6z:
dec r22 // r22 = "r", round count
breq .done // iterate
jmp .iter
.done:
pop r17
pop r16
pop r15
pop r14
pop r13
pop r12
pop r11
pop r10
pop r9
pop r8
pop r7
pop r6
ret
// Get a 64-bit word from (z..z+7) to (r6..r13)
.zget64a:
ld r6, z+
ld r7, z+
ld r8, z+
ld r9, z+
ld r10, z+
ld r11, z+
ld r12, z+
ld r13, z
ret
// Get a 64-bit word from (z..z+7) to (r14..r21)
.zget64b:
ld r14, z+
ld r15, z+
ld r16, z+
ld r17, z+
ld r18, z+
ld r19, z+
ld r20, z+
ld r21, z
ret
// Move (r6..r13) to (r14..r21)
.movab:
mov r14, r6
mov r15, r7
mov r16, r8
mov r17, r9
mov r18, r10
mov r19, r11
mov r20, r12
mov r21, r13
ret
// Put a 64-bit word (r6..r13) to (z..z+7)
.zput64a:
st z+, r6
st z+, r7
st z+, r8
st z+, r9
st z+, r10
st z+, r11
st z+, r12
st z, r13
ret
// get (z..z+7) to (r14..r21), replace with (r6..r14)
.zswp64:
ld r14, z
st z+, r6
ld r15, z
st z+, r7
ld r16, z
st z+, r8
ld r17, z
st z+, r9
ld r18, z
st z+, r10
ld r19, z
st z+, r11
ld r20, z
st z+, r12
ld r21, z
st z, r13
ret
// swap (z..z+7) with (r14..r21) without messing up (r6..r13)
.zswp64b:
mov r0, r14
ld r14, z
st z+, r0
mov r0, r15
ld r15, z
st z+, r0
mov r0, r16
ld r16, z
st z+, r0
mov r0, r17
ld r17, z
st z+, r0
mov r0, r18
ld r18, z
st z+, r0
mov r0, r19
ld r19, z
st z+, r0
mov r0, r20
ld r20, z
st z+, r0
mov r0, r21
ld r21, z
st z+, r0
ret
.rotl8:
mov r6, r21
mov r7, r14
mov r8, r15
mov r9, r16
mov r10, r17
mov r11, r18
mov r12, r19
mov r13, r20
ret
.rotl16:
mov r6, r20
mov r7, r21
mov r8, r14
mov r9, r15
mov r10, r16
mov r11, r17
mov r12, r18
mov r13, r19
ret
.rotl24:
mov r6, r19
mov r7, r20
mov r8, r21
mov r9, r14
mov r10, r15
mov r11, r16
mov r12, r17
mov r13, r18
ret
.rotl32:
mov r6, r18
mov r7, r19
mov r8, r20
mov r9, r21
mov r10, r14
mov r11, r15
mov r12, r16
mov r13, r17
ret
.rotr8:
mov r6, r15
mov r7, r16
mov r8, r17
mov r9, r18
mov r10, r19
mov r11, r20
mov r12, r21
mov r13, r14
ret
.rotr16:
mov r6, r16
mov r7, r17
mov r8, r18
mov r9, r19
mov r10, r20
mov r11, r21
mov r12, r14
mov r13, r15
ret
.rotr24:
mov r6, r17
mov r7, r18
mov r8, r19
mov r9, r20
mov r10, r21
mov r11, r14
mov r12, r15
mov r13, r16
ret
// individual bit-shifts
.rotl3: // rotate (r14--r21) left by 3 bits
lsl r14
rol r15
rol r16
rol r17
rol r18
rol r19
rol r20
rol r21
adc r14, __zero_reg__
.rotl2:
lsl r14
rol r15
rol r16
rol r17
rol r18
rol r19
rol r20
rol r21
adc r14, __zero_reg__
.rotl1:
lsl r14
rol r15
rol r16
rol r17
rol r18
rol r19
rol r20
rol r21
adc r14, __zero_reg__ // wrap-around bit
ret
.rotr3: // rotate (r14--r21) right by 3 bits
lsr r21
ror r20
ror r19
ror r18
ror r17
ror r16
ror r15
ror r14
brcc .rotr2 // 2 cycles w/o carry, 1 cycle with
ori r21, 0x80 // 1 cycle -- constant time
.rotr2:
lsr r21
ror r20
ror r19
ror r18
ror r17
ror r16
ror r15
ror r14
brcc .rotr1 // 2 cycles w/o carry, 1 cycle with
ori r21, 0x80 // 1 cycle -- constant time
.rotr1:
lsr r21
ror r20
ror r19
ror r18
ror r17
ror r16
ror r15
ror r14
brcc .rotr0 // 2 cycles w/o carry, 1 cycle with
ori r21, 0x80 // 1 cycle -- constant time
.rotr0:
ret
.xorz2:
ld r0, z
eor r0, r14
st z+, r0
ld r0, z
eor r0, r15
st z+, r0
ld r0, z
eor r0, r16
st z+, r0
ld r0, z
eor r0, r17
st z+, r0
ld r0, z
eor r0, r18
st z+, r0
ld r0, z
eor r0, r19
st z+, r0
ld r0, z
eor r0, r20
st z+, r0
ld r0, z
eor r0, r21
st z, r0
subi zl, -33
cpi zl, 200
brlo .xorz2
ret
.rotbxa: // B = (B <<< 1) ^ A
lsl r14
rol r15
rol r16
rol r17
rol r18
rol r19
rol r20
rol r21
adc r14, __zero_reg__ // wrap-around bit
eor r14, r6
eor r15, r7
eor r16, r8
eor r17, r9
eor r18, r10
eor r19, r11
eor r20, r12
eor r21, r13
ret
// round constants
.section .rodata
.type rconst, @object
.size rconst, 24
rconst: .byte 0x01, 0x92, 0xDA, 0x70, 0x9B, 0x21, 0xF1, 0x59
.byte 0x8A, 0x88, 0x39, 0x2A, 0xBB, 0xCB, 0xD9, 0x53
.byte 0x52, 0xC0, 0x1A, 0x6A, 0xF1, 0xD0, 0x21, 0x78
.global __do_copy_data
.global __do_clear_bss