rcfour optimized++; memxor optimized++
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@ -90,7 +90,7 @@
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* given in r20:r21
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*/
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arcfour_init:
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push_ r2, r28, r29
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push_ r28, r29
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movw r26, r20 /* X points to ctx */
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movw r30, r24 /* Z points to key */
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st X+, r1
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@ -103,29 +103,27 @@ arcfour_init:
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brne 1b
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movw r26, r20
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clr r18 /* r18 is keyindex counter */
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add r22, r30 /* r18 is keyindex counter */
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clr r0
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clr r19
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2:
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ld r23, X
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ld r2, Z+
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add r19, r2
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ld r18, Z+
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add r19, r18
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add r19, r23
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movw r28, r20 /* load pointer to S in Y */
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add r28, r19
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adc r29, r1
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ld r2, Y
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ld r18, Y
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st Y, r23
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st X+, r2
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inc r18
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cp r18, r22
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st X+, r18
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cp r30, r22
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brne 3f
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movw r30, r24
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clr r18
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3:
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inc r0
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brne 2b
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pop_ r29, r28, r2
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pop_ r29, r28
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ret
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/*
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@ -54,6 +54,7 @@ uint8_t arcfour_gen(arcfour_ctx_t *ctx){
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uint8_t t;
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ctx->i++;
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ctx->j += ctx->s[ctx->i];
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/* ctx->s[i] <--> ctx->s[j] */
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t = ctx->s[ctx->j];
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ctx->s[ctx->j] = ctx->s[ctx->i];
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ctx->s[ctx->i] = t;
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@ -0,0 +1,115 @@
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/* memxor.S */
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/*
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This file is part of the Crypto-avr-lib/microcrypt-lib.
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Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
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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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* File: memxor.S
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* Author: Daniel Otte
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* Date: 2006-07-06
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* License: GPLv3 or later
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* Description: Implementation of the ARCFOUR (RC4 compatible) stream cipher algorithm.
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*
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*/
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#include <avr/io.h>
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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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.macro push_range from:req, to:req
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push \from
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.if \to-\from
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push_range "(\from+1)",\to
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.endif
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.endm
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.macro pop_range from:req, to:req
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pop \to
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.if \to-\from
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pop_range \from,"(\to-1)"
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.endif
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.endm
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.macro stack_alloc size:req, reg1=r30, reg2=r31
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in \reg1, _SFR_IO_ADDR(SPL)
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in \reg2, _SFR_IO_ADDR(SPH)
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sbiw r30, \size
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out _SFR_IO_ADDR(SPH), \reg2
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out _SFR_IO_ADDR(SPL), \reg1
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.endm
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.macro stack_free size:req, reg1=r30, reg2=r31
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in \reg1, _SFR_IO_ADDR(SPL)
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in \reg2, _SFR_IO_ADDR(SPH)
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adiw r30, \size
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out _SFR_IO_ADDR(SPH), \reg2
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out _SFR_IO_ADDR(SPL), \reg1
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.endm
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/*
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* void memxor(void* dest, const void* src, uint16_t n);
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*/
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/*
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* param dest is passed in r24:r25
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* param src is passed in r22:r23
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* param n is passed in r20:r21
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*/
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.global memxor
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memxor:
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movw r30, r24
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movw r26, r22
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movw r24, r20
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tst r24
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brne 1f
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tst r25
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breq 2f
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1:
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ld r20, X+
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ld r21, Z
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eor r20, r21
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st Z+, r20
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sbiw r24, 1
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brne 1b
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2:
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ret
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@ -6,7 +6,8 @@ STREAM_CIPHERS += $(ALGO_NAME)
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$(ALGO_NAME)_OBJ := arcfour-asm.o
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$(ALGO_NAME)_TEST_BIN := main-arcfour-test.o debug.o uart.o serial-tools.o \
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nessie_stream_test.o nessie_common.o
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nessie_stream_test.o nessie_common.o cli.o \
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performance_test.o
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$(ALGO_NAME)_NESSIE_TEST := "nessie"
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$(ALGO_NAME)_PEROFRMANCE_TEST := "performance"
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@ -6,7 +6,8 @@ STREAM_CIPHERS += $(ALGO_NAME)
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$(ALGO_NAME)_OBJ := arcfour.o
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$(ALGO_NAME)_TEST_BIN := main-arcfour-test.o debug.o uart.o serial-tools.o \
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nessie_stream_test.o nessie_common.o
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nessie_stream_test.o nessie_common.o cli.o \
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performance_test.o
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$(ALGO_NAME)_NESSIE_TEST := "nessie"
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$(ALGO_NAME)_PEROFRMANCE_TEST := "performance"
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@ -28,7 +28,10 @@
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#include "arcfour.h"
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#include "nessie_stream_test.h"
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#include "cli.h"
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#include "performance_test.h"
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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@ -56,15 +59,31 @@ void testrun_nessie_arcfour(void){
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}
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void testrun_performance_arcfour(void){
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nessie_stream_ctx.outsize_b = 8; /* actually unused */
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nessie_stream_ctx.keysize_b = 128; /* this is theone we have refrence vectors for */
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nessie_stream_ctx.ivsize_b = (uint16_t)-1;
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nessie_stream_ctx.name = cipher_name;
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nessie_stream_ctx.ctx_size_B = sizeof(arcfour_ctx_t);
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nessie_stream_ctx.cipher_genctx = (nessie_stream_genctx_fpt)arcfour_genctx_dummy;
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nessie_stream_ctx.cipher_enc = (nessie_stream_genenc_fpt)arcfour_gen;
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uint64_t t;
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char str[16];
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uint8_t key[16];
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arcfour_ctx_t ctx;
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nessie_stream_run();
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calibrateTimer();
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print_overhead();
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memset(key, 0, 16);
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startTimer(1);
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arcfour_init(key, 16, &ctx);
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t = stopTimer();
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uart_putstr_P(PSTR("\r\n\tctx-gen time: "));
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ultoa((unsigned long)t, str, 10);
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uart_putstr(str);
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startTimer(1);
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arcfour_gen(&ctx);
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t = stopTimer();
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uart_putstr_P(PSTR("\r\n\tencrypt time: "));
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ultoa((unsigned long)t, str, 10);
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uart_putstr(str);
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uart_putstr_P(PSTR("\r\n"));
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}
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int main (void){
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char str[20];
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DEBUG_INIT();
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uart_putstr("\r\n");
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uart_putstr_P(PSTR("\r\n\r\nCrypto-VS ("));
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uart_putstr(cipher_name);
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uart_putstr_P(PSTR(")\r\nloaded and running\r\n"));
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restart:
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PGM_P u = PSTR("nessie\0test\0performance\0");
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void_fpt v[] = {testrun_nessie_arcfour,
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testrun_nessie_arcfour,
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testrun_performance_arcfour};
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while(1){
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if (!getnextwordn(str,20)){DEBUG_S("DBG: W1\r\n"); goto error;}
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if (strcmp(str, "nessie")) {DEBUG_S("DBG: 1b\r\n"); goto error;}
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testrun_nessie_arcfour();
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goto restart;
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if(execcommand_d0_P(str, u, v)<0){
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uart_putstr_P(PSTR("\r\nunknown command\r\n"));
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}
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continue;
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error:
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uart_putstr("ERROR\r\n");
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