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Copy pathAES_Decrypt_R.S
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AES_Decrypt_R.S
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#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#
# #
# AVR-AES-Faster Library #
# (c) 2020 Rados³aw Gancarz <[email protected]> #
# #
# This Source Code Form is subject to the terms of the Mozilla Public #
# License, v. 2.0. If a copy of the MPL was not distributed with this #
# file, You can obtain one at http://mozilla.org/MPL/2.0/. #
# #
#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#@#
#include "AVR-AES-Faster-devel.h"
#ifdef AES_BENCHMARK
#include <avr/io.h>
#endif
#============================================================================
#
# AES_Decrypt_int_R
#
# AES Decryption - S-box in RAM
#
# Input : STxx (ciphertext), ROUNDS, XKEYPTR(expanded_key+16*(nr+1))
# Output : STxx (plaintext)
# Modified: Z, TMPx, ROUNDS, C_1B, XKEYPTR
#
# Data order: S00 S10 S20 S30 S01 S11 ...
# Note: S00:S10, S01:S11, S02:S12 S03:S13, TMP0:TMP1 must be pairs (movw)
#
#define ST00 r0
#define ST10 r1
#define ST20 r2
#define ST30 r3
#define ST01 r4
#define ST11 r5
#define ST21 r6
#define ST31 r7
#define ST02 r8
#define ST12 r9
#define ST22 r10
#define ST32 r11
#define ST03 r12
#define ST13 r13
#define ST23 r14
#define ST33 r15
#define TMP4 r16
#define ROUNDS r18
#define C_1B r19
#define TMP0 r20
#define TMP1 r21
#define OUTADDR_L r22
#define OUTADDR_H r23
#define TMP2 r24
#define TMP3 r25
#define XKEYPTR_L r26
#define XKEYPTR_H r27
#define XKEYPTR X
.section .text.AES_Decrypt_R,"ax",@progbits
.global AES_Decrypt_R
AES_Decrypt_R:
#ifdef AES_BENCHMARK
lds r30,_SFR_MEM_ADDR(TCNT1L)
sts benchmark_data+0,r30
lds r30,_SFR_MEM_ADDR(TCNT1H)
sts benchmark_data+1,r30
#endif
#Move to one byte beyond end of key
mov r0,ROUNDS
inc r0
lsl r0
lsl r0
lsl r0
lsl r0
add r20,r0
adc r21,r1
rjmp AES_Decrypt_int_R
.section .text.AES_Decrypt256_R,"ax",@progbits
.global AES_Decrypt256_R
AES_Decrypt256_R:
#ifdef AES_BENCHMARK
lds r30,_SFR_MEM_ADDR(TCNT1L)
sts benchmark_data+0,r30
lds r30,_SFR_MEM_ADDR(TCNT1H)
sts benchmark_data+1,r30
#endif
ldi ROUNDS,14
subi r20,-240
sbci r21,-1
rjmp AES_Decrypt_int_R
.section .text.AES_Decrypt192_R,"ax",@progbits
.global AES_Decrypt192_R
AES_Decrypt192_R:
#ifdef AES_BENCHMARK
lds r30,_SFR_MEM_ADDR(TCNT1L)
sts benchmark_data+0,r30
lds r30,_SFR_MEM_ADDR(TCNT1H)
sts benchmark_data+1,r30
#endif
ldi ROUNDS,12
subi r20,-208
sbci r21,-1
rjmp AES_Decrypt_int_R
.section .text.AES_Decrypt128_R,"ax",@progbits
.global AES_Decrypt128_R
AES_Decrypt128_R:
#ifdef AES_BENCHMARK
lds r30,_SFR_MEM_ADDR(TCNT1L)
sts benchmark_data+0,r30
lds r30,_SFR_MEM_ADDR(TCNT1H)
sts benchmark_data+1,r30
#endif
ldi ROUNDS,10
subi r20,-176
sbci r21,-1
.global AES_Decrypt_int_R
AES_Decrypt_int_R:
push ST20
push ST30
push ST01
push ST11
push ST21
push ST31
push ST02
push ST12
push ST22
push ST32
push ST03
push ST13
push ST23
push ST33
push TMP4
movw XKEYPTR_L,r24
##Load16_Data
ld ST00,XKEYPTR+
ld ST10,XKEYPTR+
ld ST20,XKEYPTR+
ld ST30,XKEYPTR+
ld ST01,XKEYPTR+
ld ST11,XKEYPTR+
ld ST21,XKEYPTR+
ld ST31,XKEYPTR+
ld ST02,XKEYPTR+
ld ST12,XKEYPTR+
ld ST22,XKEYPTR+
ld ST32,XKEYPTR+
ld ST03,XKEYPTR+
ld ST13,XKEYPTR+
ld ST23,XKEYPTR+
ld ST33,XKEYPTR+
movw XKEYPTR_L,r20
#ifdef AES_BENCHMARK
lds r30,_SFR_MEM_ADDR(TCNT1L)
sts benchmark_data+2,r30
lds r30,_SFR_MEM_ADDR(TCNT1H)
sts benchmark_data+3,r30
AES_Decrypt_int_R_start1:
.global AES_Decrypt_int_R_start1
#endif
#------------- Real function starts here -------------
ldi zh,hi8(AES_InvSBox_R)
ldi C_1B,0x1b
#InvAddRoundKey
ld TMP0,-XKEYPTR
eor ST33,TMP0
ld TMP0,-XKEYPTR
eor ST23,TMP0
ld TMP0,-XKEYPTR
eor ST13,TMP0
ld TMP0,-XKEYPTR
eor ST03,TMP0
ld TMP0,-XKEYPTR
eor ST32,TMP0
ld TMP0,-XKEYPTR
eor ST22,TMP0
ld TMP0,-XKEYPTR
eor ST12,TMP0
ld TMP0,-XKEYPTR
eor ST02,TMP0
ld TMP0,-XKEYPTR
eor ST31,TMP0
ld TMP0,-XKEYPTR
eor ST21,TMP0
ld TMP0,-XKEYPTR
eor ST11,TMP0
ld TMP0,-XKEYPTR
eor ST01,TMP0
ld TMP0,-XKEYPTR
eor ST30,TMP0
ld TMP0,-XKEYPTR
eor ST20,TMP0
ld TMP0,-XKEYPTR
eor ST10,TMP0
ld TMP0,-XKEYPTR
eor ST00,TMP0
rjmp 101f
100:
#InvAddRoundKey
ld ST33,-XKEYPTR
eor ST33,TMP3
ld ST23,-XKEYPTR
eor ST23,TMP2
ld TMP4,-XKEYPTR
eor ST13,TMP4
ld TMP4,-XKEYPTR
eor ST03,TMP4
ld TMP4,-XKEYPTR
eor ST32,TMP4
ld ST22,-XKEYPTR
eor ST22,TMP1
ld TMP4,-XKEYPTR
eor ST12,TMP4
ld TMP4,-XKEYPTR
eor ST02,TMP4
ld TMP4,-XKEYPTR
eor ST31,TMP4
ld TMP4,-XKEYPTR
eor ST21,TMP4
ld TMP4,-XKEYPTR
eor ST11,TMP4
ld TMP4,-XKEYPTR
eor ST01,TMP4
ld TMP4,-XKEYPTR
eor ST30,TMP4
ld TMP4,-XKEYPTR
eor ST20,TMP4
ld ST10,-XKEYPTR
eor ST10,TMP0
ld TMP4,-XKEYPTR
eor ST00,TMP4
#InvMixColumns
# InvMixColumn(0)
movw TMP0,ST00
mov TMP2,ST20
eor TMP0,ST10
eor TMP1,ST20
eor TMP2,ST30
mov TMP3,TMP0
eor TMP3,TMP2
mov TMP2,TMP3
# xtime2
lsl TMP0
brcc 1f
eor TMP0,C_1B
1:
# xtime2
lsl TMP1
brcc 1f
eor TMP1,C_1B
1:
# xtime2
lsl TMP2
brcc 1f
eor TMP2,C_1B
1:
eor ST00,TMP0
eor ST10,TMP1
eor ST20,TMP0
eor ST30,TMP1
eor ST20,TMP2
eor ST30,TMP2
eor TMP0,TMP1
# xtime2
lsl TMP0
brcc 1f
eor TMP0,C_1B
1:
# xtime2
lsl TMP2
brcc 1f
eor TMP2,C_1B
1:
mov TMP1,TMP2
# xtime2
lsl TMP1
brcc 1f
eor TMP1,C_1B
1:
eor TMP1,TMP3
eor TMP0,TMP1
eor ST00,TMP0
eor ST20,TMP0
eor TMP0,TMP2
eor ST10,TMP0
eor ST30,TMP0
# InvMixColumn(1)
movw TMP0,ST01
mov TMP2,ST21
eor TMP0,ST11
eor TMP1,ST21
eor TMP2,ST31
mov TMP3,TMP0
eor TMP3,TMP2
mov TMP2,TMP3
# xtime2
lsl TMP0
brcc 1f
eor TMP0,C_1B
1:
# xtime2
lsl TMP1
brcc 1f
eor TMP1,C_1B
1:
# xtime2
lsl TMP2
brcc 1f
eor TMP2,C_1B
1:
eor ST01,TMP0
eor ST11,TMP1
eor ST21,TMP0
eor ST31,TMP1
eor ST21,TMP2
eor ST31,TMP2
eor TMP0,TMP1
# xtime2
lsl TMP0
brcc 1f
eor TMP0,C_1B
1:
# xtime2
lsl TMP2
brcc 1f
eor TMP2,C_1B
1:
mov TMP1,TMP2
# xtime2
lsl TMP1
brcc 1f
eor TMP1,C_1B
1:
eor TMP1,TMP3
eor TMP0,TMP1
eor ST01,TMP0
eor ST21,TMP0
eor TMP0,TMP2
eor ST11,TMP0
eor ST31,TMP0
# InvMixColumn(2)
movw TMP0,ST02
mov TMP2,ST22
eor TMP0,ST12
eor TMP1,ST22
eor TMP2,ST32
mov TMP3,TMP0
eor TMP3,TMP2
mov TMP2,TMP3
# xtime2
lsl TMP0
brcc 1f
eor TMP0,C_1B
1:
# xtime2
lsl TMP1
brcc 1f
eor TMP1,C_1B
1:
# xtime2
lsl TMP2
brcc 1f
eor TMP2,C_1B
1:
eor ST02,TMP0
eor ST12,TMP1
eor ST22,TMP0
eor ST32,TMP1
eor ST22,TMP2
eor ST32,TMP2
eor TMP0,TMP1
# xtime2
lsl TMP0
brcc 1f
eor TMP0,C_1B
1:
# xtime2
lsl TMP2
brcc 1f
eor TMP2,C_1B
1:
mov TMP1,TMP2
# xtime2
lsl TMP1
brcc 1f
eor TMP1,C_1B
1:
eor TMP1,TMP3
eor TMP0,TMP1
eor ST02,TMP0
eor ST22,TMP0
eor TMP0,TMP2
eor ST12,TMP0
eor ST32,TMP0
# InvMixColumn(3)
movw TMP0,ST03
mov TMP2,ST23
eor TMP0,ST13
eor TMP1,ST23
eor TMP2,ST33
mov TMP3,TMP0
eor TMP3,TMP2
mov TMP2,TMP3
# xtime2
lsl TMP0
brcc 1f
eor TMP0,C_1B
1:
# xtime2
lsl TMP1
brcc 1f
eor TMP1,C_1B
1:
# xtime2
lsl TMP2
brcc 1f
eor TMP2,C_1B
1:
eor ST03,TMP0
eor ST13,TMP1
eor ST23,TMP0
eor ST33,TMP1
eor ST23,TMP2
eor ST33,TMP2
eor TMP0,TMP1
# xtime2
lsl TMP0
brcc 1f
eor TMP0,C_1B
1:
# xtime2
lsl TMP2
brcc 1f
eor TMP2,C_1B
1:
mov TMP1,TMP2
# xtime2
lsl TMP1
brcc 1f
eor TMP1,C_1B
1:
eor TMP1,TMP3
eor TMP0,TMP1
eor ST03,TMP0
eor ST23,TMP0
eor TMP0,TMP2
eor ST13,TMP0
eor ST33,TMP0
101:
#InvSubBytesShiftRows
# row 0
mov zl,ST00
ld ST00,Z
mov zl,ST01
ld ST01,Z
mov zl,ST02
ld ST02,Z
mov zl,ST03
ld ST03,Z
# row 1
mov zl,ST13
ld TMP0,Z
mov zl,ST12
ld ST13,Z
mov zl,ST11
ld ST12,Z
mov zl,ST10
ld ST11,Z
# row 2
mov zl,ST20
ld TMP1,Z
mov zl,ST21
ld TMP2,Z
mov zl,ST22
ld ST20,Z
mov zl,ST23
ld ST21,Z
# row 3
mov zl,ST30
ld TMP3,Z
mov zl,ST31
ld ST30,Z
mov zl,ST32
ld ST31,Z
mov zl,ST33
ld ST32,Z
dec ROUNDS
breq 1f ; exit
rjmp 100b
1:
#InvAddRoundKey
ld ST33,-XKEYPTR
eor ST33,TMP3
ld ST23,-XKEYPTR
eor ST23,TMP2
ld TMP4,-XKEYPTR
eor ST13,TMP4
ld TMP4,-XKEYPTR
eor ST03,TMP4
ld TMP4,-XKEYPTR
eor ST32,TMP4
ld ST22,-XKEYPTR
eor ST22,TMP1
ld TMP4,-XKEYPTR
eor ST12,TMP4
ld TMP4,-XKEYPTR
eor ST02,TMP4
ld TMP4,-XKEYPTR
eor ST31,TMP4
ld TMP4,-XKEYPTR
eor ST21,TMP4
ld TMP4,-XKEYPTR
eor ST11,TMP4
ld TMP4,-XKEYPTR
eor ST01,TMP4
ld TMP4,-XKEYPTR
eor ST30,TMP4
ld TMP4,-XKEYPTR
eor ST20,TMP4
ld ST10,-XKEYPTR
eor ST10,TMP0
ld TMP4,-XKEYPTR
eor ST00,TMP4
#-------------- Real function ends here --------------
#ifdef AES_BENCHMARK
AES_Decrypt_int_R_end1:
.global AES_Decrypt_int_R_end1
lds r24,_SFR_MEM_ADDR(TCNT1L)
sts benchmark_data+4,r24
lds r24,_SFR_MEM_ADDR(TCNT1H)
sts benchmark_data+5,r24
#endif
movw XKEYPTR_L,OUTADDR_L
#Store16_Data
st XKEYPTR+,ST00
st XKEYPTR+,ST10
st XKEYPTR+,ST20
st XKEYPTR+,ST30
st XKEYPTR+,ST01
st XKEYPTR+,ST11
st XKEYPTR+,ST21
st XKEYPTR+,ST31
st XKEYPTR+,ST02
st XKEYPTR+,ST12
st XKEYPTR+,ST22
st XKEYPTR+,ST32
st XKEYPTR+,ST03
st XKEYPTR+,ST13
st XKEYPTR+,ST23
st XKEYPTR+,ST33
pop TMP4
pop ST33
pop ST23
pop ST13
pop ST03
pop ST32
pop ST22
pop ST12
pop ST02
pop ST31
pop ST21
pop ST11
pop ST01
pop ST30
pop ST20
eor r1, r1
#ifdef AES_BENCHMARK
lds r30,_SFR_MEM_ADDR(TCNT1L)
sts benchmark_data+6,r30
lds r30,_SFR_MEM_ADDR(TCNT1H)
sts benchmark_data+7,r30
#endif
ret
#ifdef AES_BENCHMARK
AES_Decrypt_int_R_end:
.global AES_Decrypt_int_R_end
#endif
.size AES_Decrypt_int_R,.-AES_Decrypt_int_R
#undef ST00
#undef ST10
#undef ST20
#undef ST30
#undef ST01
#undef ST11
#undef ST21
#undef ST31
#undef ST02
#undef ST12
#undef ST22
#undef ST32
#undef ST03
#undef ST13
#undef ST23
#undef ST33
#undef TMP4
#undef ROUNDS
#undef C_1B
#undef TMP0
#undef TMP1
#undef OUTADDR_L
#undef OUTADDR_H
#undef TMP2
#undef TMP3
#undef XKEYPTR_L
#undef XKEYPTR_H
#undef XKEYPTR