SSB_HighSpeed_Modem/hsmodem/scrambler.cpp

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2020-11-05 13:11:57 -05:00
/*
* High Speed modem to transfer data in a 2,7kHz SSB channel
* =========================================================
* Author: DJ0ABR
*
* (c) DJ0ABR
* www.dj0abr.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 2 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, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include "hsmodem.h"
uint8_t scr[400] = {
130 , 239 , 223 , 19 , 146 , 254 , 12 , 86 , 106 , 68 ,
77 , 213 , 243 , 216 , 102 , 227 , 108 , 113 , 229 , 89 ,
26 , 64 , 138 , 216 , 225 , 121 , 194 , 137 , 152 , 64 ,
51 , 175 , 68 , 200 , 37 , 104 , 247 , 68 , 193 , 50 ,
19 , 14 , 196 , 81 , 4 , 236 , 191 , 249 , 83 , 25 ,
161 , 171 , 167 , 29 , 33 , 139 , 7 , 152 , 230 , 144 ,
125 , 206 , 34 , 236 , 112 , 78 , 219 , 34 , 181 , 161 ,
7 , 45 , 198 , 235 , 62 , 115 , 194 , 100 , 209 , 95 ,
186 , 161 , 53 , 10 , 110 , 246 , 122 , 246 , 207 , 194 ,
178 , 63 , 232 , 93 , 158 , 234 , 231 , 73 , 214 , 64,
130 , 239 , 223 , 19 , 146 , 254 , 12 , 86 , 106 , 68 ,
77 , 213 , 243 , 216 , 102 , 227 , 108 , 113 , 229 , 89 ,
26 , 64 , 138 , 216 , 225 , 121 , 194 , 137 , 152 , 64 ,
51 , 175 , 68 , 200 , 37 , 104 , 247 , 68 , 193 , 50 ,
19 , 14 , 196 , 81 , 4 , 236 , 191 , 249 , 83 , 25 ,
161 , 171 , 167 , 29 , 33 , 139 , 7 , 152 , 230 , 144 ,
125 , 206 , 34 , 236 , 112 , 78 , 219 , 34 , 181 , 161 ,
7 , 45 , 198 , 235 , 62 , 115 , 194 , 100 , 209 , 95 ,
186 , 161 , 53 , 10 , 110 , 246 , 122 , 246 , 207 , 194 ,
178 , 63 , 232 , 93 , 158 , 234 , 231 , 73 , 214 , 64,
130 , 239 , 223 , 19 , 146 , 254 , 12 , 86 , 106 , 68 ,
77 , 213 , 243 , 216 , 102 , 227 , 108 , 113 , 229 , 89 ,
26 , 64 , 138 , 216 , 225 , 121 , 194 , 137 , 152 , 64 ,
51 , 175 , 68 , 200 , 37 , 104 , 247 , 68 , 193 , 50 ,
19 , 14 , 196 , 81 , 4 , 236 , 191 , 249 , 83 , 25 ,
161 , 171 , 167 , 29 , 33 , 139 , 7 , 152 , 230 , 144 ,
125 , 206 , 34 , 236 , 112 , 78 , 219 , 34 , 181 , 161 ,
7 , 45 , 198 , 235 , 62 , 115 , 194 , 100 , 209 , 95 ,
186 , 161 , 53 , 10 , 110 , 246 , 122 , 246 , 207 , 194 ,
178 , 63 , 232 , 93 , 158 , 234 , 231 , 73 , 214 , 64,
130 , 239 , 223 , 19 , 146 , 254 , 12 , 86 , 106 , 68 ,
77 , 213 , 243 , 216 , 102 , 227 , 108 , 113 , 229 , 89 ,
26 , 64 , 138 , 216 , 225 , 121 , 194 , 137 , 152 , 64 ,
51 , 175 , 68 , 200 , 37 , 104 , 247 , 68 , 193 , 50 ,
19 , 14 , 196 , 81 , 4 , 236 , 191 , 249 , 83 , 25 ,
161 , 171 , 167 , 29 , 33 , 139 , 7 , 152 , 230 , 144 ,
125 , 206 , 34 , 236 , 112 , 78 , 219 , 34 , 181 , 161 ,
7 , 45 , 198 , 235 , 62 , 115 , 194 , 100 , 209 , 95 ,
186 , 161 , 53 , 10 , 110 , 246 , 122 , 246 , 207 , 194 ,
178 , 63 , 232 , 93 , 158 , 234 , 231 , 73 , 214 , 64
};
uint8_t rx_scrbuf[400];
void TX_Scramble(uint8_t *data, int len)
{
if (len > 400) return;
for(int i=0; i<len; i++)
data[i] ^= scr[i];
}
uint8_t *RX_Scramble(uint8_t *data, int len)
{
if (len > 400) return data;
memcpy(rx_scrbuf,data,len);
for(int i=0; i<len; i++)
rx_scrbuf[i] ^= scr[i];
return rx_scrbuf;
}