3 This file is part of the Crypto-avr-lib/microcrypt-lib.
4 Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
21 * \email daniel.otte@rub.de
23 * \license GPLv3 or later
32 .macro push_ p1:req, p2:vararg
39 .macro pop_ p1:req, p2:vararg
46 .macro push_range from:req, to:req
49 push_range "(\from+1)",\to
53 .macro pop_range from:req, to:req
56 pop_range \from,"(\to-1)"
60 .macro stack_alloc size:req, reg1=r30, reg2=r31
61 in \reg1, _SFR_IO_ADDR(SPL)
62 in \reg2, _SFR_IO_ADDR(SPH)
64 out _SFR_IO_ADDR(SPH), \reg2
65 out _SFR_IO_ADDR(SPL), \reg1
68 .macro stack_free size:req, reg1=r30, reg2=r31
69 in \reg1, _SFR_IO_ADDR(SPL)
70 in \reg2, _SFR_IO_ADDR(SPH)
72 out _SFR_IO_ADDR(SPH), \reg2
73 out _SFR_IO_ADDR(SPL), \reg1
91 * void noekeon_omac(void* dest, const void* msg, uint16_t msglength_b,
92 * const void* key, uint8_t t)
95 /* param dest is passed in r24:r25
96 * param msg is passed in r22:r23
97 * param msglength_b is passed in r20:r21
98 * param key is passed in r18:r19
99 * param t is passed in r16
118 rcall push_r18_r27_func
120 rcall pop_r18_r27_func
128 /* copy block to stack buffer */
137 rcall push_r18_r27_func
139 rcall pop_r18_r27_func
146 rcall push_r18_r27_func
148 rcall pop_r18_r27_func
150 bst r20, 6 /* set t bit if msglength_b%128==0*/
154 movw r30, r24 /* z points to encrypted null vector (L) */
164 2: /* B/P has been calculated */
174 /* B/P has been xored into stack buffer */
175 /* now we have to xor-in the remaining message */
189 /* now we have only to insert the 1 at the end of message if msglength_b%128 != 0 */