100 lines
1.7 KiB
ArmAsm
100 lines
1.7 KiB
ArmAsm
/* noekeon_cbc_enc.S */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2006-2015 Daniel Otte (bg@nerilex.org)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* \author Daniel Otte
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* \email bg@nerilex.org
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* \date 2008-08-06
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* \license GPLv3 or later
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*
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*
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*
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*/
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.macro push_ p1:req p2:vararg
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push \p1
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.ifnb \p2
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push_ \p2
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.endif
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.endm
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.macro pop_ p1:req p2:vararg
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pop \p1
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.ifnb \p2
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pop_ \p2
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.endif
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.endm
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.extern noekeon_enc
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/*
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* void noekeon_cbc_enc(void *buffer, uint8_t block_cnt, const void *key)
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*/
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/* param buffer is passed in r24:r25
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* param block_cnt is passed in r22 (r23 is 0)
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* param key is passed in r20:r21
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*/
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.global noekeon_cbc_enc
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noekeon_cbc_enc:
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push r22
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movw r22, r20
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push_ r22, r23, r24, r25
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rcall noekeon_enc
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1:
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pop_ r27, r26, r23, r22
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pop r16 /* block counter */
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dec r16
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breq 9f
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push r16
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/* xor blocks */
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movw r30, r26
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adiw r30, 16
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ldi r16, 16
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2:
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ld r17, X+
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ld r18, Z
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eor r18, r17
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st Z+, r18
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dec r16
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brne 2b
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/* call encryption function; X points to our new block */
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push_ r22, r23, r26, r27
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movw r24, r26
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rcall noekeon_enc
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rjmp 1b
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9:
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ret
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