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Xoodoo-avr8-u1.s
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Xoodoo-avr8-u1.s
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;
; The eXtended Keccak Code Package (XKCP)
; https://github.com/XKCP/XKCP
;
; The Xoodoo permutation, designed by Joan Daemen, Seth Hoffert, Gilles Van Assche and Ronny Van Keer.
;
; Implementation by Ronny Van Keer, hereby denoted as "the implementer".
;
; For more information, feedback or questions, please refer to the Keccak Team website:
; https://keccak.team/
;
; To the extent possible under law, the implementer has waived all copyright
; and related or neighboring rights to the source code in this file.
; http://creativecommons.org/publicdomain/zero/1.0/
;
; ---
;
; This file implements Xoodoo in a SnP-compatible way.
; Please refer to SnP-documentation.h for more details.
;
; This implementation comes with Xoodoo-SnP.h in the same folder.
; Please refer to LowLevel.build for the exact list of other files it must be combined with.
;
; INFO: Tested on ATmega1280 simulator
; Registers used in all routines
#define zero 1
#define rpState 24
#define rX 26
#define rY 28
#define rZ 30
#define sp 0x3D
;----------------------------------------------------------------------------
;
; void Xoodoo_StaticInitialize( void )
;
.global Xoodoo_StaticInitialize
;----------------------------------------------------------------------------
;
; void Xoodoo_Initialize(Xoodoo_plain8_state *state)
;
; argument state is passed in r24:r25
;
.global Xoodoo_Initialize
Xoodoo_Initialize:
movw rZ, r24
ldi r23, 3*4/2 ; clear state (8 bytes / 2 lanes) per iteration
Xoodoo_Initialize_Loop:
st z+, zero
st z+, zero
st z+, zero
st z+, zero
st z+, zero
st z+, zero
st z+, zero
st z+, zero
dec r23
brne Xoodoo_Initialize_Loop
Xoodoo_StaticInitialize:
ret
;----------------------------------------------------------------------------
;
; void Xoodoo_AddByte(Xoodoo_plain8_state *state, unsigned char data, unsigned int offset)
;
; argument state is passed in r24:r25
; argument data is passed in r22:r23, only LSB (r22) is used
; argument offset is passed in r20:r21, only LSB (r20) is used
;
.global Xoodoo_AddByte
Xoodoo_AddByte:
movw rZ, r24
add rZ, r20
adc rZ+1, zero
ld r0, Z
eor r0, r22
st Z, r0
ret
;----------------------------------------------------------------------------
;
; void Xoodoo_AddBytes(Xoodoo_plain8_state *state, const unsigned char *data, unsigned int offset, unsigned int length)
;
; argument state is passed in r24:r25
; argument data is passed in r22:r23
; argument offset is passed in r20:r21, only LSB (r20) is used
; argument length is passed in r18:r19, only LSB (r18) is used
;
.global Xoodoo_AddBytes
Xoodoo_AddBytes:
movw rZ, r24
add rZ, r20
adc rZ+1, zero
movw rX, r22
subi r18, 8
brcs Xoodoo_AddBytes_Byte
;do 8 bytes per iteration
Xoodoo_AddBytes_Loop8:
ld r21, X+
ld r0, Z
eor r0, r21
st Z+, r0
ld r21, X+
ld r0, Z
eor r0, r21
st Z+, r0
ld r21, X+
ld r0, Z
eor r0, r21
st Z+, r0
ld r21, X+
ld r0, Z
eor r0, r21
st Z+, r0
ld r21, X+
ld r0, Z
eor r0, r21
st Z+, r0
ld r21, X+
ld r0, Z
eor r0, r21
st Z+, r0
ld r21, X+
ld r0, Z
eor r0, r21
st Z+, r0
ld r21, X+
ld r0, Z
eor r0, r21
st Z+, r0
subi r18, 8
brcc Xoodoo_AddBytes_Loop8
Xoodoo_AddBytes_Byte:
ldi r19, 8
add r18, r19
breq Xoodoo_AddBytes_End
Xoodoo_AddBytes_Loop1:
ld r21, X+
ld r0, Z
eor r0, r21
st Z+, r0
dec r18
brne Xoodoo_AddBytes_Loop1
Xoodoo_AddBytes_End:
ret
;----------------------------------------------------------------------------
;
; void Xoodoo_OverwriteBytes(Xoodoo_plain8_state *state, const unsigned char *data, unsigned int offset, unsigned int length)
;
; argument state is passed in r24:r25
; argument data is passed in r22:r23
; argument offset is passed in r20:r21, only LSB (r20) is used
; argument length is passed in r18:r19, only LSB (r18) is used
;
.global Xoodoo_OverwriteBytes
Xoodoo_OverwriteBytes:
movw rZ, r24
add rZ, r20
adc rZ+1, zero
movw rX, r22
subi r18, 8
brcs Xoodoo_OverwriteBytes_Byte
;do 8 bytes per iteration
Xoodoo_OverwriteBytes_Loop8:
ld r0, X+
st Z+, r0
ld r0, X+
st Z+, r0
ld r0, X+
st Z+, r0
ld r0, X+
st Z+, r0
ld r0, X+
st Z+, r0
ld r0, X+
st Z+, r0
ld r0, X+
st Z+, r0
ld r0, X+
st Z+, r0
subi r18, 8
brcc Xoodoo_OverwriteBytes_Loop8
Xoodoo_OverwriteBytes_Byte:
ldi r19, 8
add r18, r19
breq Xoodoo_OverwriteBytes_End
Xoodoo_OverwriteBytes_Loop1:
ld r0, X+
st Z+, r0
dec r18
brne Xoodoo_OverwriteBytes_Loop1
Xoodoo_OverwriteBytes_End:
ret
;----------------------------------------------------------------------------
;
; void Xoodoo_OverwriteWithZeroes(Xoodoo_plain8_state *state, unsigned int byteCount)
;
; argument state is passed in r24:r25
; argument byteCount is passed in r22:r23, only LSB (r22) is used
;
.global Xoodoo_OverwriteWithZeroes
Xoodoo_OverwriteWithZeroes:
movw rZ, r24 ; rZ = state
mov r23, r22
lsr r23
lsr r23
lsr r23
breq Xoodoo_OverwriteWithZeroes_Bytes
Xoodoo_OverwriteWithZeroes_LoopLanes:
st Z+, r1
st Z+, r1
st Z+, r1
st Z+, r1
st Z+, r1
st Z+, r1
st Z+, r1
st Z+, r1
dec r23
brne Xoodoo_OverwriteWithZeroes_LoopLanes
Xoodoo_OverwriteWithZeroes_Bytes:
andi r22, 7
breq Xoodoo_OverwriteWithZeroes_End
Xoodoo_OverwriteWithZeroes_LoopBytes:
st Z+, r1
dec r22
brne Xoodoo_OverwriteWithZeroes_LoopBytes
Xoodoo_OverwriteWithZeroes_End:
ret
;----------------------------------------------------------------------------
;
; void Xoodoo_ExtractBytes(Xoodoo_plain8_state *state, const unsigned char *data, unsigned int offset, unsigned int length)
;
; argument state is passed in r24:r25
; argument data is passed in r22:r23
; argument offset is passed in r20:r21, only LSB (r20) is used
; argument length is passed in r18:r19, only LSB (r18) is used
;
.global Xoodoo_ExtractBytes
Xoodoo_ExtractBytes:
movw rZ, r24
add rZ, r20
adc rZ+1, zero
movw rX, r22
subi r18, 8
brcs Xoodoo_ExtractBytes_Byte
;do 8 bytes per iteration
Xoodoo_ExtractBytes_Loop8:
ld r0, Z+
st X+, r0
ld r0, Z+
st X+, r0
ld r0, Z+
st X+, r0
ld r0, Z+
st X+, r0
ld r0, Z+
st X+, r0
ld r0, Z+
st X+, r0
ld r0, Z+
st X+, r0
ld r0, Z+
st X+, r0
subi r18, 8
brcc Xoodoo_ExtractBytes_Loop8
Xoodoo_ExtractBytes_Byte:
ldi r19, 8
add r18, r19
breq Xoodoo_ExtractBytes_End
Xoodoo_ExtractBytes_Loop1:
ld r0, Z+
st X+, r0
dec r18
brne Xoodoo_ExtractBytes_Loop1
Xoodoo_ExtractBytes_End:
ret
;----------------------------------------------------------------------------
;
; void Xoodoo_ExtractAndAddBytes(Xoodoo_plain8_state *state, const unsigned char *input, unsigned char *output, unsigned int offset, unsigned int length)
;
; argument state is passed in r24:r25
; argument input is passed in r22:r23
; argument output is passed in r20:r21
; argument offset is passed in r18:r19, only LSB (r18) is used
; argument length is passed in r16:r17, only LSB (r16) is used
;
.global Xoodoo_ExtractAndAddBytes
Xoodoo_ExtractAndAddBytes:
tst r16
breq Xoodoo_ExtractAndAddBytes_End
push r16
push r28
push r29
movw rZ, r24
add rZ, r18
adc rZ+1, zero
movw rX, r22
movw rY, r20
subi r16, 8
brcs Xoodoo_ExtractAndAddBytes_Byte
Xoodoo_ExtractAndAddBytes_LoopLane:
ld r21, Z+
ld r0, X+
eor r0, r21
st Y+, r0
ld r21, Z+
ld r0, X+
eor r0, r21
st Y+, r0
ld r21, Z+
ld r0, X+
eor r0, r21
st Y+, r0
ld r21, Z+
ld r0, X+
eor r0, r21
st Y+, r0
ld r21, Z+
ld r0, X+
eor r0, r21
st Y+, r0
ld r21, Z+
ld r0, X+
eor r0, r21
st Y+, r0
ld r21, Z+
ld r0, X+
eor r0, r21
st Y+, r0
ld r21, Z+
ld r0, X+
eor r0, r21
st Y+, r0
subi r16, 8
brcc Xoodoo_ExtractAndAddBytes_LoopLane
Xoodoo_ExtractAndAddBytes_Byte:
ldi r19, 8
add r16, r19
breq Xoodoo_ExtractAndAddBytes_Done
Xoodoo_ExtractAndAddBytes_Loop1:
ld r21, Z+
ld r0, X+
eor r0, r21
st Y+, r0
dec r16
brne Xoodoo_ExtractAndAddBytes_Loop1
Xoodoo_ExtractAndAddBytes_Done:
pop r29
pop r28
pop r16
Xoodoo_ExtractAndAddBytes_End:
ret
Xoodoo_RoundConstants_12:
.BYTE 0x58, 0x00
.BYTE 0x38, 0x00
.BYTE 0xC0, 0x03
.BYTE 0xD0, 0x00
.BYTE 0x20, 0x01
.BYTE 0x14, 0x00
Xoodoo_RoundConstants_6:
.BYTE 0x60, 0x00
.BYTE 0x2C, 0x00
.BYTE 0x80, 0x03
.BYTE 0xF0, 0x00
.BYTE 0xA0, 0x01
.BYTE 0x12, 0x00
Xoodoo_RoundConstants_0:
.BYTE 0xFF, 0 ; terminator
.text
; Register variables used in permutation
#define rC0 2 // 4 regs (2-5)
#define rC1 6 // 4 regs (6-9)
#define rC2 10 // 4 regs (10-13)
#define rC3 14 // 4 regs (14-17)
#define rVv 18 // 4 regs (18-21)
#define rTt 22 // 4 regs (22-25)
// r26-27 free
#define a00 0
#define a01 4
#define a02 8
#define a03 12
#define a10 16
#define a11 20
#define a12 24
#define a13 28
#define a20 32
#define a21 36
#define a22 40
#define a23 44
;----------------------------------------------------------------------------
;
; void Xoodoo_Permute_Nrounds( Xoodoo_plain8_state *state, unsigned int nrounds )
;
; argument state is passed in r24:r25
; argument nrounds is passed in r22:r23 (only LSB (r22) is used)
;
.global Xoodoo_Permute_Nrounds
Xoodoo_Permute_Nrounds:
mov r26, r22
ldi rZ+0, lo8(Xoodoo_RoundConstants_0)
ldi rZ+1, hi8(Xoodoo_RoundConstants_0)
lsl r26
sub rZ, r26
sbc rZ+1, zero
rjmp Xoodoo_Permute
;----------------------------------------------------------------------------
;
; void Xoodoo_Permute_6rounds( Xoodoo_plain8_state *state )
;
; argument state is passed in r24:r25
;
.global Xoodoo_Permute_6rounds
Xoodoo_Permute_6rounds:
ldi rZ+0, lo8(Xoodoo_RoundConstants_6)
ldi rZ+1, hi8(Xoodoo_RoundConstants_6)
rjmp Xoodoo_Permute
;----------------------------------------------------------------------------
;
; void Xoodoo_Permute_12rounds( Xoodoo_plain8_state *state )
;
; argument state is passed in r24:r25
;
.global Xoodoo_Permute_12rounds
Xoodoo_Permute_12rounds:
ldi rZ+0, lo8(Xoodoo_RoundConstants_12)
ldi rZ+1, hi8(Xoodoo_RoundConstants_12)
Xoodoo_Permute:
push r2
push r3
push r4
push r5
push r6
push r7
push r8
push r9
push r10
push r11
push r12
push r13
push r14
push r15
push r16
push r17
push r28
push r29
; Initial Prepare Theta
movw rY, rpState
ld rC0+0, Y+ ; a00
ld rC0+1, Y+
ld rC0+2, Y+
ld rC0+3, Y+
ld rC1+0, Y+ ; a01
ld rC1+1, Y+
ld rC1+2, Y+
ld rC1+3, Y+
ld rC2+0, Y+ ; a02
ld rC2+1, Y+
ld rC2+2, Y+
ld rC2+3, Y+
ld rC3+0, Y+ ; a03
ld rC3+1, Y+
ld rC3+2, Y+
ld rC3+3, Y+
ld r0, Y+ ; a10
eor rC0+0, r0
ld r0, Y+
eor rC0+1, r0
ld r0, Y+
eor rC0+2, r0
ld r0, Y+
eor rC0+3, r0
ld r0, Y+ ; a11
eor rC1+0, r0
ld r0, Y+
eor rC1+1, r0
ld r0, Y+
eor rC1+2, r0
ld r0, Y+
eor rC1+3, r0
ld r0, Y+ ; a12
eor rC2+0, r0
ld r0, Y+
eor rC2+1, r0
ld r0, Y+
eor rC2+2, r0
ld r0, Y+
eor rC2+3, r0
ld r0, Y+ ; a13
eor rC3+0, r0
ld r0, Y+
eor rC3+1, r0
ld r0, Y+
eor rC3+2, r0
ld r0, Y+
eor rC3+3, r0
ld r0, Y+ ; a20
eor rC0+0, r0
ld r0, Y+
eor rC0+1, r0
ld r0, Y+
eor rC0+2, r0
ld r0, Y+
eor rC0+3, r0
ld r0, Y+ ; a21
eor rC1+0, r0
ld r0, Y+
eor rC1+1, r0
ld r0, Y+
eor rC1+2, r0
ld r0, Y+
eor rC1+3, r0
ld r0, Y+ ; a22
eor rC2+0, r0
ld r0, Y+
eor rC2+1, r0
ld r0, Y+
eor rC2+2, r0
ld r0, Y+
eor rC2+3, r0
ld r0, Y+ ; a23
eor rC3+0, r0
ld r0, Y+
eor rC3+1, r0
ld r0, Y+
eor rC3+2, r0
ld r0, Y+
eor rC3+3, r0
sbiw rY, 48
Xoodoo_RoundLoop:
; Theta + Rho west
; c0 = ROTL32(c0 ^ ROTL32(c0, 9), 5);
mov rVv+1, rC0+0 ; rol 9
mov rVv+2, rC0+1
mov rVv+3, rC0+2
mov rVv+0, rC0+3
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
eor rVv+0, rC0+0
eor rVv+1, rC0+1
eor rVv+2, rC0+2
eor rVv+3, rC0+3
bst rVv, 0 ; rol 5 (= ror 3 + rol 8)
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
bst rVv, 0
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
bst rVv, 0
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
mov rC0+0, rVv+3
mov rC0+1, rVv+0
mov rC0+2, rVv+1
mov rC0+3, rVv+2
; c1 = ROTL32(c1 ^ ROTL32(c1, 9), 5);
mov rVv+1, rC1+0 ; rol 9
mov rVv+2, rC1+1
mov rVv+3, rC1+2
mov rVv+0, rC1+3
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
eor rVv+0, rC1+0
eor rVv+1, rC1+1
eor rVv+2, rC1+2
eor rVv+3, rC1+3
bst rVv, 0 ; rol 5 (= ror 3 + rol 8)
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
bst rVv, 0
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
bst rVv, 0
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
mov rC1+0, rVv+3
mov rC1+1, rVv+0
mov rC1+2, rVv+1
mov rC1+3, rVv+2
; c2 = ROTL32(c2 ^ ROTL32(c2, 9), 5);
mov rVv+1, rC2+0 ; rol 9
mov rVv+2, rC2+1
mov rVv+3, rC2+2
mov rVv+0, rC2+3
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
eor rVv+0, rC2+0
eor rVv+1, rC2+1
eor rVv+2, rC2+2
eor rVv+3, rC2+3
bst rVv, 0 ; rol 5 (= ror 3 + rol 8)
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
bst rVv, 0
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
bst rVv, 0
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
mov rC2+0, rVv+3
mov rC2+1, rVv+0
mov rC2+2, rVv+1
mov rC2+3, rVv+2
; c3 = ROTL32(c3 ^ ROTL32(c3, 9), 5);
mov rVv+1, rC3+0 ; rol 9
mov rVv+2, rC3+1
mov rVv+3, rC3+2
mov rVv+0, rC3+3
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
eor rVv+0, rC3+0
eor rVv+1, rC3+1
eor rVv+2, rC3+2
eor rVv+3, rC3+3
bst rVv, 0 ; rol 5 (= ror 3 + rol 8)
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
bst rVv, 0
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
bst rVv, 0
ror rVv+3
ror rVv+2
ror rVv+1
ror rVv
bld rVv+3, 7
mov rC3+0, rVv+3
mov rC3+1, rVv+0
mov rC3+2, rVv+1
mov rC3+3, rVv+2
; v1 = a13;
ldd rVv+0, Y+a13+0
ldd rVv+1, Y+a13+1
ldd rVv+2, Y+a13+2
ldd rVv+3, Y+a13+3
; a13 = a12 ^ c1;
ldd r0, Y+a12+0
eor r0, rC1+0
std Y+a13+0, r0
ldd r0, Y+a12+1
eor r0, rC1+1
std Y+a13+1, r0
ldd r0, Y+a12+2
eor r0, rC1+2
std Y+a13+2, r0
ldd r0, Y+a12+3
eor r0, rC1+3
std Y+a13+3, r0
; a12 = a11 ^ c0;
ldd r0, Y+a11+0
eor r0, rC0+0
std Y+a12+0, r0
ldd r0, Y+a11+1
eor r0, rC0+1
std Y+a12+1, r0
ldd r0, Y+a11+2
eor r0, rC0+2
std Y+a12+2, r0
ldd r0, Y+a11+3
eor r0, rC0+3
std Y+a12+3, r0
; a11 = a10 ^ c3;
ldd r0, Y+a10+0
eor r0, rC3+0
std Y+a11+0, r0
ldd r0, Y+a10+1
eor r0, rC3+1
std Y+a11+1, r0
ldd r0, Y+a10+2
eor r0, rC3+2
std Y+a11+2, r0
ldd r0, Y+a10+3
eor r0, rC3+3
std Y+a11+3, r0
; a10 = v1 ^ c2;
eor rVv+0, rC2+0
std Y+a10+0, rVv+0
eor rVv+1, rC2+1
std Y+a10+1, rVv+1
eor rVv+2, rC2+2
std Y+a10+2, rVv+2
eor rVv+3, rC2+3
std Y+a10+3, rVv+3
; a20 = ROTL32(a20 ^ c3, 11);
ldd rVv+0, Y+a20+3
eor rVv+0, rC3+3
ldd rVv+1, Y+a20+0
eor rVv+1, rC3+0
ldd rVv+2, Y+a20+1
eor rVv+2, rC3+1
ldd rVv+3, Y+a20+2
eor rVv+3, rC3+2
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
std Y+a20+0, rVv+0
std Y+a20+1, rVv+1
std Y+a20+2, rVv+2
std Y+a20+3, rVv+3
; a21 = ROTL32(a21 ^ c0, 11);
ldd rVv+0, Y+a21+3
eor rVv+0, rC0+3
ldd rVv+1, Y+a21+0
eor rVv+1, rC0+0
ldd rVv+2, Y+a21+1
eor rVv+2, rC0+1
ldd rVv+3, Y+a21+2
eor rVv+3, rC0+2
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
std Y+a21+0, rVv+0
std Y+a21+1, rVv+1
std Y+a21+2, rVv+2
std Y+a21+3, rVv+3
; a22 = ROTL32(a22 ^ c1, 11);
ldd rVv+0, Y+a22+3
eor rVv+0, rC1+3
ldd rVv+1, Y+a22+0
eor rVv+1, rC1+0
ldd rVv+2, Y+a22+1
eor rVv+2, rC1+1
ldd rVv+3, Y+a22+2
eor rVv+3, rC1+2
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
std Y+a22+0, rVv+0
std Y+a22+1, rVv+1
std Y+a22+2, rVv+2
std Y+a22+3, rVv+3
; a23 = ROTL32(a23 ^ c2, 11);
ldd rVv+0, Y+a23+3
eor rVv+0, rC2+3
ldd rVv+1, Y+a23+0
eor rVv+1, rC2+0
ldd rVv+2, Y+a23+1
eor rVv+2, rC2+1
ldd rVv+3, Y+a23+2
eor rVv+3, rC2+2
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
lsl rVv+0
rol rVv+1
rol rVv+2
rol rVv+3
adc rVv+0, zero
std Y+a23+0, rVv+0
std Y+a23+1, rVv+1
std Y+a23+2, rVv+2
std Y+a23+3, rVv+3
; v1 = c3;
movw rVv+0, rC3+0
movw rVv+2, rC3+2
; c3 = a03 ^ c2; /* a03 resides in c3 */
ldd rC3+0, Y+a03+0
eor rC3+0, rC2+0
ldd rC3+1, Y+a03+1
eor rC3+1, rC2+1
ldd rC3+2, Y+a03+2
eor rC3+2, rC2+2
ldd rC3+3, Y+a03+3
eor rC3+3, rC2+3
; c2 = a02 ^ c1; /* a02 resides in c2 */
ldd rC2+0, Y+a02+0
eor rC2+0, rC1+0
ldd rC2+1, Y+a02+1
eor rC2+1, rC1+1
ldd rC2+2, Y+a02+2
eor rC2+2, rC1+2
ldd rC2+3, Y+a02+3
eor rC2+3, rC1+3
; c1 = a01 ^ c0; /* a01 resides in c1 */
ldd rC1+0, Y+a01+0
eor rC1+0, rC0+0
ldd rC1+1, Y+a01+1
eor rC1+1, rC0+1
ldd rC1+2, Y+a01+2
eor rC1+2, rC0+2
ldd rC1+3, Y+a01+3
eor rC1+3, rC0+3
; c0 = a00 ^ v1; /* a00 resides in c0 */
ldd rC0+0, Y+a00+0
eor rC0+0, rVv+0
ldd rC0+1, Y+a00+1
eor rC0+1, rVv+1
ldd rC0+2, Y+a00+2
eor rC0+2, rVv+2
ldd rC0+3, Y+a00+3
eor rC0+3, rVv+3
; c0 ^= __rc; /* +Iota */
lpm rVv+0, Z+
lpm rVv+1, Z+
eor rC0+0, rVv+0
eor rC0+1, rVv+1
; Chi + Rho east + Early Theta
; a00 = c0 ^= ~a10 & a20;
ldd r0, Y+a10+0
com r0
ldd rTt+0, Y+a20+0 ; a20 in rTt
and r0, rTt+0
eor rC0+0, r0
std Y+a00+0, rC0+0
ldd r0, Y+a10+1
com r0
ldd rTt+1, Y+a20+1
and r0, rTt+1
eor rC0+1, r0
std Y+a00+1, rC0+1
ldd r0, Y+a10+2
com r0
ldd rTt+2, Y+a20+2
and r0, rTt+2
eor rC0+2, r0
std Y+a00+2, rC0+2
ldd r0, Y+a10+3
com r0
ldd rTt+3, Y+a20+3
and r0, rTt+3
eor rC0+3, r0
std Y+a00+3, rC0+3
; a10 ^= ~a20 & c0;
com rTt+0
and rTt+0, rC0+0
ldd r0, Y+a10+0
eor rTt+0, r0 ; new a10 in rTt
std Y+a10+0, rTt+0
com rTt+1
and rTt+1, rC0+1
ldd r0, Y+a10+1
eor rTt+1, r0
std Y+a10+1, rTt+1
com rTt+2
and rTt+2, rC0+2
ldd r0, Y+a10+2
eor rTt+2, r0
std Y+a10+2, rTt+2
com rTt+3
and rTt+3, rC0+3
ldd r0, Y+a10+3
eor rTt+3, r0
std Y+a10+3, rTt+3
; v1(a20) = ROTL32(a20 ^ ~c0 & a10, 8);
movw rVv+0, rTt+0 ; a10 in rVv
movw rVv+2, rTt+2
mov r0, rC0+0
com r0
and rTt+0, r0
ldd r0, Y+a20+0
eor rTt+0, r0
mov r0, rC0+1
com r0
and rTt+1, r0
ldd r0, Y+a20+1
eor rTt+1, r0
mov r0, rC0+2
com r0
and rTt+2, r0
ldd r0, Y+a20+2
eor rTt+2, r0
mov r0, rC0+3
com r0
and rTt+3, r0
ldd r0, Y+a20+3
eor rTt+3, r0
std Y+a20+0, rTt+3
std Y+a20+1, rTt+0
std Y+a20+2, rTt+1
std Y+a20+3, rTt+2