--- /dev/null
+/* threefish_invmix.S */
+/*
+ This file is part of the AVR-Crypto-Lib.
+ Copyright (C) 2009 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/>.
+*/
+/*
+ * \author Daniel Otte
+ * \email daniel.otte@rub.de
+ * \date 2009-03-21
+ * \license GPLv3 or later
+ */
+
+#include "avr-asm-macros.S"
+
+/*
+#define X0 (((uint64_t*)data)[0])
+#define X1 (((uint64_t*)data)[1])
+void threefish_invmix(void* data, uint8_t rot){
+ uint64_t x;
+ x = X1;
+ x ^= X0;
+ X1 = ((x>>rot)|(x<<(64-rot)));
+ X0 -= X1;
+}
+*/
+A0 = 10
+A1 = 11
+A2 = 12
+A3 = 13
+A4 = 14
+A5 = 15
+A6 = 16
+A7 = 17
+
+B0 = 18
+B1 = 19
+B2 = 20
+B3 = 21
+B4 = 22
+B5 = 23
+B6 = 24
+B7 = 25
+vROT = 27
+/*
+ * param data: r24:r25
+ * param rot: r22
+ */
+
+.global threefish_invmix
+threefish_invmix:
+ push_range 10, 17
+ push r28
+ push r29
+ movw r28, r24
+ mov vROT,r22
+ ldd A0, Y+ 0
+ ldd A1, Y+ 1
+ ldd A2, Y+ 2
+ ldd A3, Y+ 3
+ ldd A4, Y+ 4
+ ldd A5, Y+ 5
+ ldd A6, Y+ 6
+ ldd A7, Y+ 7
+ ldd B0, Y+ 8
+ ldd B1, Y+ 9
+ ldd B2, Y+10
+ ldd B3, Y+11
+ ldd B4, Y+12
+ ldd B5, Y+13
+ ldd B6, Y+14
+ ldd B7, Y+15
+ eor B0, A0
+ eor B1, A1
+ eor B2, A2
+ eor B3, A3
+ eor B4, A4
+ eor B5, A5
+ eor B6, A6
+ eor B7, A7
+
+ mov r26, vROT
+ swap r26
+ andi r26, 0x07
+ ldi r30, pm_lo8(byte_rot_jmptable)
+ ldi r31, pm_hi8(byte_rot_jmptable)
+ add r30, r26
+ adc r31, r1
+ ijmp
+post_byterot:
+ bst vROT, 3
+ andi vROT, 0x07
+ brts 1f
+ rjmp bit_rotr
+1: rjmp bit_rotl
+post_bitrot:
+ sub A0, B0
+ sbc A1, B1
+ sbc A2, B2
+ sbc A3, B3
+ sbc A4, B4
+ sbc A5, B5
+ sbc A6, B6
+ sbc A7, B7
+
+ std Y+ 0, A0
+ std Y+ 1, A1
+ std Y+ 2, A2
+ std Y+ 3, A3
+ std Y+ 4, A4
+ std Y+ 5, A5
+ std Y+ 6, A6
+ std Y+ 7, A7
+ std Y+ 8, B0
+ std Y+ 9, B1
+ std Y+10, B2
+ std Y+11, B3
+ std Y+12, B4
+ std Y+13, B5
+ std Y+14, B6
+ std Y+15, B7
+exit:
+ pop r29
+ pop r28
+ pop_range 10, 17
+ ret
+
+byte_rot_jmptable:
+ rjmp post_byterot;ret; rjmp byte_rotr_0
+ rjmp byte_rotr_1
+ rjmp byte_rotr_2
+ rjmp byte_rotr_3
+ rjmp byte_rotr_4
+ rjmp byte_rotr_5
+ rjmp byte_rotr_6
+ rjmp byte_rotr_7
+ rjmp post_byterot;ret; rjmp byte_rotr_0
+
+
+
+; 0 1 2 3 4 5 6 7
+; 1 2 3 4 5 6 7 0
+;.global byte_rotr_1
+;.global byte_rotr_0
+byte_rotr_1: /* 10 words */
+ mov r0, B0
+ mov B0, B1
+ mov B1, B2
+ mov B2, B3
+ mov B3, B4
+ mov B4, B5
+ mov B5, B6
+ mov B6, B7
+ mov B7, r0
+byte_rotr_0:
+ rjmp post_byterot
+
+; 0 1 2 3 4 5 6 7
+; 2 3 4 5 6 7 0 1
+;.global byte_rotr_2
+byte_rotr_2: /* 11 words */
+ mov r0, B0
+ mov B0, B2
+ mov B2, B4
+ mov B4, B6
+ mov B6, r0
+ mov r0, B1
+ mov B1, B3
+ mov B3, B5
+ mov B5, B7
+ mov B7, r0
+ rjmp post_byterot
+
+; 0 1 2 3 4 5 6 7
+; 3 4 5 6 7 0 1 2
+;.global byte_rotr_3
+byte_rotr_3: /* 10 words */
+ mov r0, B0
+ mov B0, B3
+ mov B3, B6
+ mov B6, B1
+ mov B1, B4
+ mov B4, B7
+ mov B7, B2
+ mov B2, B5
+ mov B5, r0
+ rjmp post_byterot
+
+; 0 1 2 3 4 5 6 7
+; 4 5 6 7 0 1 2 3
+;.global byte_rotr_4
+byte_rotr_4: /* 13 words */
+ mov r0, B0
+ mov B0, B4
+ mov B4, r0
+
+ mov r0, B1
+ mov B1, B5
+ mov B5, r0
+
+ mov r0, B2
+ mov B2, B6
+ mov B6, r0
+
+ mov r0, B3
+ mov B3, B7
+ mov B7, r0
+ rjmp post_byterot
+
+; 0 1 2 3 4 5 6 7
+; 5 6 7 0 1 2 3 4
+;.global byte_rotr_5
+byte_rotr_5: /* 10 words */
+ mov r0, B0
+ mov B0, B5
+ mov B5, B2
+ mov B2, B7
+ mov B7, B4
+ mov B4, B1
+ mov B1, B6
+ mov B6, B3
+ mov B3, r0
+ rjmp post_byterot
+
+; 0 1 2 3 4 5 6 7
+; 6 7 0 1 2 3 4 5
+;.global byte_rotr_6
+byte_rotr_6: /* 11 words */
+ mov r0, B0
+ mov B0, B6
+ mov B6, B4
+ mov B4, B2
+ mov B2, r0
+
+ mov r0, B1
+ mov B1, B7
+ mov B7, B5
+ mov B5, B3
+ mov B3, r0
+ rjmp post_byterot
+
+; 0 1 2 3 4 5 6 7
+; 7 0 1 2 3 4 5 6
+;.global byte_rotr_7
+byte_rotr_7: /* 10 words */
+ mov r0, B7
+ mov B7, B6
+ mov B6, B5
+ mov B5, B4
+ mov B4, B3
+ mov B3, B2
+ mov B2, B1
+ mov B1, B0
+ mov B0, r0
+ rjmp post_byterot
+
+;.global bit_rotl
+bit_rotl:
+ tst vROT
+ brne 1f
+ rjmp post_bitrot
+1: mov r0, B7
+ rol r0
+ rol B0
+ rol B1
+ rol B2
+ rol B3
+ rol B4
+ rol B5
+ rol B6
+ rol B7
+ dec vROT
+ rjmp bit_rotl
+
+;.global bit_rotr
+bit_rotr:
+ tst vROT
+ brne 1f
+ rjmp post_bitrot
+1: mov r0, B0
+ ror r0
+ ror B7
+ ror B6
+ ror B5
+ ror B4
+ ror B3
+ ror B2
+ ror B1
+ ror B0
+ dec vROT
+ rjmp bit_rotr
+
+
projects / avr-crypto-lib.git / blobdiff