71 lines
1.7 KiB
ArmAsm
71 lines
1.7 KiB
ArmAsm
/* noekeon_ctr.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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.extern noekeon_enc
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/*
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* void noekeon_ctr_next(void *buffer, const noekeon_ctr_ctx_t *ctx);
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*/
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.global noekeon_ctr_next
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/*
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* param buffer passed in r24:r25
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* param ctx passed in r22:r23
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*/
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noekeon_ctr_next:
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/* copy counter to buffer */
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movw r26, r24 /* copy buffer pointer to X */
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movw r30, r22 /* copy counter pointer to Z */
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ldi r16, 16
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1:
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ld r0, Z+
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st X+, r0
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dec r16
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brne 1b
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/* increment counter */
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movw r30, r22 /* copy counter pointer to Z */
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ldi r17, 1
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ldi r16, 15
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ld r0, Z
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add r0, r17
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st Z+, r0
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1:
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ld r0, Z
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adc r0, r1
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st Z+, r0
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dec r16
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brne 1b
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/* call encryption routine */
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/* we can leave the first param as is, but have to adjust the second to point to the key */
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//adiw r22, 16
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ldi r16, 16
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add r22, r16
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adc r23, r0
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// rcall noekeon_enc
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// ret
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rjmp noekeon_enc /* noekeon_enc will return for us */
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