--- /dev/null
+/* twister-asm.S */
+/*
+ This file is part of the AVR-Crypto-Lib.
+ Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * \file twister-asm.S
+ * \email daniel.otte@rub.de
+ * \author Daniel Otte
+ * \date 2008-12-22
+ * \license GPLv3 or later
+ *
+ */
+
+#include "avr-asm-macros.S"
+
+twister_sbox:
+.byte 0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5
+.byte 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76
+.byte 0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0
+.byte 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0
+.byte 0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc
+.byte 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15
+.byte 0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a
+.byte 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75
+.byte 0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0
+.byte 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84
+.byte 0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b
+.byte 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf
+.byte 0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85
+.byte 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8
+.byte 0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5
+.byte 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2
+.byte 0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17
+.byte 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73
+.byte 0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88
+.byte 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb
+.byte 0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c
+.byte 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79
+.byte 0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9
+.byte 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08
+.byte 0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6
+.byte 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a
+.byte 0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e
+.byte 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e
+.byte 0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94
+.byte 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf
+.byte 0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68
+.byte 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16
+
+
+/*
+ * param ctx: r24:r25
+ *
+ */
+X_SAVE0 = 4
+X_SAVE1 = 5
+Y_SAVE0 = 6
+Y_SAVE1 = 7
+MDS0 = 8
+MDS1 = 9
+MDS2 = 10
+MDS3 = 11
+MDS4 = 12
+MDS5 = 13
+MDS6 = 14
+MDS7 = 15
+IDX1 = 18
+IDX2 = 19
+TMP = 21
+.global twister_blank_round
+twister_blank_round:
+ push_range 4, 17
+ push r28
+ push r29
+ stack_alloc_large 64, r28, r29
+
+ movw r30, r24
+ adiw r30, 63
+ adiw r30, 1+8 /* Z points behind counter */
+ movw r26, r24
+ adiw r26, 1
+ ldi r22, 8
+1: /* "add" counter */
+ ld r16, -Z
+ ld r21, X
+ eor r21, r16
+ st X, r21
+ adiw r26, 8
+ dec r22
+ brne 1b
+
+ /* decrement counter */
+ subi r16, 1
+ st Z+, r16
+ ldi r17, 7
+1:
+ ld r16, Z
+ sbci r16, 0
+ st Z+, r16
+ dec r17
+ brne 1b
+
+ movw r26, r24
+ adiw r28, 1 /* Y points to stack memory */
+ movw Y_SAVE0, r28
+ ldi r20, lo8(twister_sbox)
+ ldi r21, hi8(twister_sbox)
+ ldi r19, 64
+
+1: /* sbox substitution */
+ ld r0, X+
+ movw r30, r20
+ add r30, r0
+ adc r31, r1
+ lpm r0, Z
+ st Y+, r0
+ dec r19
+ brne 1b
+
+ /* load MDS-Table to MDS0:MDS7 */
+/*
+ ldi r18, 1
+ mov MDS1, r18
+ mov MDS6, r18
+ mov MDS7, r18
+ ldi r18, 2
+ mov MDS0, r18
+ ldi r18, 5
+ mov MDS5, r18
+ ldi r18, 6
+ mov MDS2, r18
+ ldi r18, 7
+ mov MDS4, r18
+ ldi r18, 8
+ mov MDS3, r18
+*/
+ ldi r18, 1
+ mov MDS1, r18
+ mov MDS2, r18
+ mov MDS7, r18
+ ldi r18, 2
+ mov MDS0, r18
+ ldi r18, 5
+ mov MDS3, r18
+ ldi r18, 6
+ mov MDS6, r18
+ ldi r18, 7
+ mov MDS4, r18
+ ldi r18, 8
+ mov MDS5, r18
+; sbiw r28, 63
+; sbiw r28, 1 /* Y points again at tmp buffer */
+; movw Y_SAVE0, r28
+; sbiw r26, 63
+; sbiw r26, 1 /* X points again at state buffer */
+ movw X_SAVE0, r24
+
+ ldi r20, 0x4D /* reducer for gf256mul*/
+ ldi r16, 0
+
+; rjmp 9f
+1:
+ mov IDX1, r16
+ movw r26, X_SAVE0
+ add r26, r16
+ adc r27, r1
+ ldi r17, 0
+2:
+ mov IDX2, r17
+
+ mov r24, MDS0
+ movw r28, Y_SAVE0
+ add r28, IDX1
+ adc r29, r1
+ ld r22, Y
+ rcall gf256mul
+ mov r0, r24
+
+ mov r24, MDS1
+ movw r28, Y_SAVE0
+ adiw r28, 8
+ inc IDX1
+ andi IDX1, 0x07
+ add r28, IDX1
+ adc r29, r1
+ ld r22, Y
+ rcall gf256mul
+ eor r0, r24
+
+ mov r24, MDS2
+ movw r28, Y_SAVE0
+ adiw r28, 8*2
+ inc IDX1
+ andi IDX1, 0x07
+ add r28, IDX1
+ adc r29, r1
+ ld r22, Y
+ rcall gf256mul
+ eor r0, r24
+
+ mov r24, MDS3
+ movw r28, Y_SAVE0
+ adiw r28, 8*3
+ inc IDX1
+ andi IDX1, 0x07
+ add r28, IDX1
+ adc r29, r1
+ ld r22, Y
+ rcall gf256mul
+ eor r0, r24
+
+ mov r24, MDS4
+ movw r28, Y_SAVE0
+ adiw r28, 8*4
+ inc IDX1
+ andi IDX1, 0x07
+ add r28, IDX1
+ adc r29, r1
+ ld r22, Y
+ rcall gf256mul
+ eor r0, r24
+
+ mov r24, MDS5
+ movw r28, Y_SAVE0
+ adiw r28, 8*5
+ inc IDX1
+ andi IDX1, 0x07
+ add r28, IDX1
+ adc r29, r1
+ ld r22, Y
+ rcall gf256mul
+ eor r0, r24
+
+ mov r24, MDS6
+ movw r28, Y_SAVE0
+ adiw r28, 8*6
+ inc IDX1
+ andi IDX1, 0x07
+ add r28, IDX1
+ adc r29, r1
+ ld r22, Y
+ rcall gf256mul
+ eor r0, r24
+
+ mov r24, MDS7
+ movw r28, Y_SAVE0
+ adiw r28, 8*7
+ inc IDX1
+ andi IDX1, 0x07
+ add r28, IDX1
+ adc r29, r1
+ ld r22, Y
+ rcall gf256mul
+ eor r0, r24
+
+ st X, r0
+ adiw r26, 8
+/*
+ mov r0, MDS0
+ mov MDS0, MDS1
+ mov MDS1, MDS2
+ mov MDS2, MDS3
+ mov MDS3, MDS4
+ mov MDS4, MDS5
+ mov MDS5, MDS6
+ mov MDS6, MDS7
+ mov MDS7, r0
+*/
+ mov r0, MDS7
+ mov MDS7, MDS6
+ mov MDS6, MDS5
+ mov MDS5, MDS4
+ mov MDS4, MDS3
+ mov MDS3, MDS2
+ mov MDS2, MDS1
+ mov MDS1, MDS0
+ mov MDS0, r0
+
+ cpi r17, 7
+ breq 8f
+ inc r17
+ rjmp 2b
+8:
+
+ mov r0, MDS7
+ mov MDS7, MDS6
+ mov MDS6, MDS5
+ mov MDS5, MDS4
+ mov MDS4, MDS3
+ mov MDS3, MDS2
+ mov MDS2, MDS1
+ mov MDS1, MDS0
+ mov MDS0, r0
+
+ cpi r16, 7
+ breq 9f
+ inc r16
+ rjmp 1b
+9:
+ stack_free_large 64
+ pop r29
+ pop r28
+ pop_range 4, 17
+ ret
+
+
+A = 23
+B = 22
+P = 24
+
+gf256mul:
+ mov A, r24
+ clr P
+1:
+ lsr A
+ breq 4f
+ brcc 2f
+ eor P, B
+2:
+ lsl B
+ brcc 3f
+ eor B, r20
+3:
+ rjmp 1b
+4:
+ brcc 2f
+ eor P, B
+2:
+ ret
+
+
+
+
+
+
+
+
projects / avr-crypto-lib.git / blobdiff