--- /dev/null
+/* twister-small-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-small-asm.S
+ * \email daniel.otte@rub.de
+ * \author Daniel Otte
+ * \date 2008-12-26
+ * \license GPLv3 or later
+ *
+ */
+
+#include "avr-asm-macros.S"
+
+/* void twister_small_init(twister_state_t* ctx, uint16_t hashsize_b)*/
+/*
+ * param ctx: r24:r25
+ * param hashsize_b: r22:r23
+ */
+.global twister224_init
+twister224_init:
+ ldi r22, lo8(224)
+ ldi r23, hi8(224)
+ rjmp 1f
+
+.global twister256_init
+twister256_init:
+ ldi r22, lo8(256)
+ ldi r23, hi8(256)
+
+.global twister_small_init
+twister_small_init:
+ movw r30, r24
+ ldi r24, 64
+1:
+ st Z+, r1
+ dec r24
+ brne 1b
+
+ dec r1
+ ldi r24, 8
+1:
+ st Z+, r1
+ dec r24
+ brne 1b
+
+ inc r1
+ ldi r24, 8
+1:
+ st Z+, r1
+ dec r24
+ brne 1b
+
+ sbiw r30, 1+8+8
+ sbiw r30, 8*7
+ st Z, r23
+ std Z+8, r22
+ ret
+#if 1
+/*********************************************************************/
+/* void twister_small_lastBlock(twister_state_t* ctx, void* msg, uint16_t length_b) */
+/*
+ * param ctx: r24:r25
+ * param msg: r22:r23
+ * param length_b: r20:r21
+ */
+TMP_SAVE0 = 12
+TMP_SAVE1 = 13
+CTX_SAVE0 = 14
+CTX_SAVE1 = 15
+LEN_SAVE0 = 16
+LEN_SAVE1 = 17
+MSG_SAVE0 = 28
+MSG_SAVE1 = 29
+.global twister_small_lastBlock
+.global twister224_lastBlock
+.global twister256_lastBlock
+
+twister224_lastBlock:
+twister256_lastBlock:
+twister_small_lastBlock:
+ push_range 12, 17
+ push r28
+ push r29
+ stack_alloc_large 64
+ adiw r30, 1
+ movw TMP_SAVE0, r30
+ movw CTX_SAVE0, r24
+ movw MSG_SAVE0, r22
+ movw LEN_SAVE0, r20
+1:
+ cpi LEN_SAVE1, 2
+ brmi 2f
+ movw r24, CTX_SAVE0
+ movw r22, MSG_SAVE0
+ rcall twister_small_nextBlock
+ adiw MSG_SAVE0, 8
+ subi LEN_SAVE1, 2
+ rjmp 1b
+2:
+ movw r18, LEN_SAVE0
+ lsr r19
+ ror r18
+ lsr r18
+ lsr r18
+ ldi r19, 63
+ movw r26, MSG_SAVE0
+ movw r30, TMP_SAVE0
+ ldi r20, 0x80
+ sub r19, r18 /* r18: bytes to copy, r19: bytes to clear */
+
+ ld r0, X+
+3: tst r18
+ breq 4f
+31:
+ st Z+, r0
+ ld r0, X+
+ dec r18
+ brne 31b
+4:
+ mov r18, LEN_SAVE0
+ andi r18, 0x07
+ ldi r20, 0x80
+ breq 5f
+4:
+ lsr r20
+ dec r18
+ brne 4b
+ or r20, r0
+ rjmp 5f
+
+5:
+ st Z+, r20
+
+ tst r19
+ breq 7f
+6:
+ st Z+, r1
+ dec r19
+ brne 6b
+7:
+ movw r24, CTX_SAVE0
+ movw r22, TMP_SAVE0
+ rcall twister_small_nextBlock
+
+ ldi r19, 2
+ clr r18
+
+ sub r18, LEN_SAVE0
+ sbc r19, LEN_SAVE1
+ movw r26, CTX_SAVE0
+ adiw r26, 63
+ adiw r26, 1+8
+
+ ld r0, X
+ sub r0, r18
+ st X+, r0
+ ld r0, X
+ sbc r0, r19
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+ ld r0, X
+ sbc r0, r1
+ st X+, r0
+
+ sbiw r26, 8
+ movw r24, CTX_SAVE0
+ movw r22, r26
+ rcall twister_mini_round
+
+ movw r24, CTX_SAVE0
+ rcall twister_blank_round
+
+ stack_free_large 64
+ pop r29
+ pop r28
+ pop_range 12, 17
+ ret
+
+#endif
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