Irayya Mathad / CRC

prototype

Dependents:   Mbed_Prototype_copy_4_INNO_day_15_6_2017

crc.cpp@3:1250751bf7b0, 2017-06-20 (annotated)

Committer:
irayya
Date:
Tue Jun 20 05:34:42 2017 +0000
Revision:
3:1250751bf7b0
Parent:
2:c0d73ae91788 
Modified

Who changed what in which revision?

UserRevisionLine numberNew contents of line
irayya 0:b3b7346e07fe 1 #include "mbed.h"
irayya 0:b3b7346e07fe 2 #include "crc.h"
irayya 0:b3b7346e07fe 3 Serial output(USBTX,USBRX);
irayya 0:b3b7346e07fe 4 char result1[18];
irayya 0:b3b7346e07fe 5 int binary1[256];
irayya 0:b3b7346e07fe 6 char binary2[256];
irayya 0:b3b7346e07fe 7 int generator[]= {1,0,0,0,0,1,0,0,0,0,0,0,1,0,0,0};
irayya 0:b3b7346e07fe 8 int v,v1;
irayya 0:b3b7346e07fe 9
irayya 0:b3b7346e07fe 10
irayya 0:b3b7346e07fe 11
irayya 2:c0d73ae91788 12 char* crcCheck_transmit(char* targetChar) //for transmission the data from gateway to slave device with crc
irayya 0:b3b7346e07fe 13 {
irayya 0:b3b7346e07fe 14 int i1,j1,k1,l1,h1;
irayya 2:c0d73ae91788 15
irayya 0:b3b7346e07fe 16
irayya 0:b3b7346e07fe 17
irayya 0:b3b7346e07fe 18 v=0,v1=0;
irayya 2:c0d73ae91788 19 for(h1=0; h1<16; h1++) { //loop for binary printing
irayya 0:b3b7346e07fe 20 printBinary(targetChar[h1]);
irayya 2:c0d73ae91788 21 output.printf(" - ");
irayya 0:b3b7346e07fe 22 }
irayya 0:b3b7346e07fe 23 //output.printf("%d",sizeof(f));
irayya 3:1250751bf7b0 24 // output.printf("\n The data to be analyzed is : ");
irayya 0:b3b7346e07fe 25 int frame[v+16];
irayya 2:c0d73ae91788 26 for(h1=0; h1<v; h1++) { //storing the binary data in frame array
irayya 3:1250751bf7b0 27 // output.printf("%d",binary1[h1]);
irayya 0:b3b7346e07fe 28 frame[h1]=binary1[h1];
irayya 0:b3b7346e07fe 29 }
irayya 2:c0d73ae91788 30 //frame[2]=0;
irayya 3:1250751bf7b0 31 /* output.printf("\n The value of v is : %d ",v); //Printing the value of V i.e total binary no.
irayya 0:b3b7346e07fe 32
irayya 0:b3b7346e07fe 33 output.printf("\n Sender Side:");
irayya 3:1250751bf7b0 34 output.printf("\n Frame: ");*/
irayya 3:1250751bf7b0 35 /* for(i1=0; i1<v; i1++) { // total binary stream printing
irayya 0:b3b7346e07fe 36 output.printf("%d",frame[i1]);
irayya 0:b3b7346e07fe 37 }
irayya 3:1250751bf7b0 38 output.printf("\n Generator : "); */ // generator for CRC checking
irayya 3:1250751bf7b0 39 /* for(i1=0; i1<16; i1++) {
irayya 0:b3b7346e07fe 40 output.printf("%d",generator[i1]);
irayya 3:1250751bf7b0 41 }*/
irayya 0:b3b7346e07fe 42
irayya 0:b3b7346e07fe 43 //Append 0's
irayya 0:b3b7346e07fe 44 int rs1=16-1;
irayya 2:c0d73ae91788 45 for (i1=v; i1<v+rs1; i1++) { //appending the zeros to the data for calculating the crc
irayya 0:b3b7346e07fe 46 frame[i1]=0;
irayya 0:b3b7346e07fe 47 }
irayya 0:b3b7346e07fe 48
irayya 0:b3b7346e07fe 49 int temp2[v+16];
irayya 2:c0d73ae91788 50 for(i1=0; i1<v+16; i1++) { // copying the data from one array to another array
irayya 0:b3b7346e07fe 51 temp2[i1]=frame[i1];
irayya 0:b3b7346e07fe 52 }
irayya 0:b3b7346e07fe 53
irayya 3:1250751bf7b0 54 /* output.printf("\n Message after appending 0's :");
irayya 2:c0d73ae91788 55 for(i1=0; i1<v+rs1; i1++) { //printing the data after appending zeros
irayya 0:b3b7346e07fe 56 output.printf("%d",temp2[i1]);
irayya 3:1250751bf7b0 57 }*/
irayya 0:b3b7346e07fe 58
irayya 0:b3b7346e07fe 59 //Division
irayya 2:c0d73ae91788 60 for(i1=0; i1<v; i1++) { //CRC generating through division operation
irayya 0:b3b7346e07fe 61 j1=0;
irayya 0:b3b7346e07fe 62 k1=i1;
irayya 0:b3b7346e07fe 63 //check whether it is divisible or not
irayya 0:b3b7346e07fe 64 if (temp2[k1]>=generator[j1]) {
irayya 0:b3b7346e07fe 65 for(j1=0,k1=i1; j1<16; j1++,k1++) {
irayya 0:b3b7346e07fe 66 if((temp2[k1]==1 && generator[j1]==1) || (temp2[k1]==0 && generator[j1]==0)) {
irayya 0:b3b7346e07fe 67 temp2[k1]=0;
irayya 0:b3b7346e07fe 68 } else {
irayya 0:b3b7346e07fe 69 temp2[k1]=1;
irayya 0:b3b7346e07fe 70 }
irayya 0:b3b7346e07fe 71 }
irayya 0:b3b7346e07fe 72 }
irayya 0:b3b7346e07fe 73 }
irayya 0:b3b7346e07fe 74
irayya 0:b3b7346e07fe 75 //CRC
irayya 0:b3b7346e07fe 76 int crc[16];
irayya 2:c0d73ae91788 77 for(i1=0,j1=v; i1<rs1; i1++,j1++) { // storing CRC bits in CRC array
irayya 0:b3b7346e07fe 78 crc[i1]=temp2[j1];
irayya 0:b3b7346e07fe 79 }
irayya 0:b3b7346e07fe 80
irayya 3:1250751bf7b0 81 /*output.printf("\n CRC bits: ");
irayya 2:c0d73ae91788 82 for(i1=0; i1<rs1; i1++) { //printing CRC bits
irayya 0:b3b7346e07fe 83 output.printf("%d",crc[i1]);
irayya 3:1250751bf7b0 84 }*/
irayya 0:b3b7346e07fe 85
irayya 3:1250751bf7b0 86 //output.printf("\n Transmitted Frame: ");
irayya 2:c0d73ae91788 87 int tf2[v+16];
irayya 2:c0d73ae91788 88 char tf3[v+16];
irayya 2:c0d73ae91788 89 for(i1=0; i1<v; i1++) { // copying the data from one to another
irayya 2:c0d73ae91788 90 tf2[i1]=frame[i1];
irayya 2:c0d73ae91788 91 }
irayya 2:c0d73ae91788 92 for(i1=v,j1=0; i1<v+rs1; i1++,j1++) { // Adding CRC bits to the data
irayya 2:c0d73ae91788 93 tf2[i1]=crc[j1];
irayya 2:c0d73ae91788 94 }
irayya 3:1250751bf7b0 95 /* for(i1=0; i1<v+rs1; i1++) { // printing the data after adding the CRC bits to the data
irayya 2:c0d73ae91788 96 output.printf("%d",tf2[i1]);
irayya 3:1250751bf7b0 97 }*/
irayya 1:fc4b4d69aa7a 98
irayya 2:c0d73ae91788 99 tf2[v+rs1]=0;
irayya 1:fc4b4d69aa7a 100
irayya 3:1250751bf7b0 101 /* output.printf("\n The final data to be sent is : "); // printing the Final data
irayya 3:1250751bf7b0 102 for(i1=0; i1<=v+rs1; i1++) {
irayya 3:1250751bf7b0 103 output.printf("%d",tf2[i1]);
irayya 3:1250751bf7b0 104 }*/
irayya 3:1250751bf7b0 105
irayya 3:1250751bf7b0 106 /* for(i1=0;i1<7;i1++)
irayya 3:1250751bf7b0 107 {
irayya 3:1250751bf7b0 108 tf2[i1]=1;
irayya 3:1250751bf7b0 109 }
irayya 3:1250751bf7b0 110 for(i1=136;i1<144;i1++)
irayya 3:1250751bf7b0 111 {
irayya 3:1250751bf7b0 112 tf2[i1]=1;
irayya 3:1250751bf7b0 113 }
irayya 2:c0d73ae91788 114 output.printf("\n The final data to be sent is : "); // printing the Final data
irayya 2:c0d73ae91788 115 for(i1=0; i1<=v+rs1; i1++) {
irayya 2:c0d73ae91788 116 output.printf("%d",tf2[i1]);
irayya 3:1250751bf7b0 117 }*/
irayya 2:c0d73ae91788 118 for(i1=0; i1<=v+rs1; i1++) {
irayya 2:c0d73ae91788 119 charBinary(tf2[i1]);
irayya 0:b3b7346e07fe 120 }
irayya 3:1250751bf7b0 121 /* output.printf("\n The final data to be sent is : ");
irayya 2:c0d73ae91788 122 for(i1=0; i1<=v+rs1; i1++) {
irayya 0:b3b7346e07fe 123 output.printf("%c",binary2[i1]);
irayya 3:1250751bf7b0 124 }*/
irayya 0:b3b7346e07fe 125 printChar(binary2);
irayya 2:c0d73ae91788 126
irayya 0:b3b7346e07fe 127 char* str=result1;
irayya 2:c0d73ae91788 128 //result1[18]='!';
irayya 2:c0d73ae91788 129 output.printf("\n check %s ", str);
irayya 0:b3b7346e07fe 130 v=0,v1=0;
irayya 2:c0d73ae91788 131 return result1;
irayya 0:b3b7346e07fe 132 }
irayya 2:c0d73ae91788 133
irayya 2:c0d73ae91788 134
irayya 2:c0d73ae91788 135
irayya 2:c0d73ae91788 136 int crcCheck_receive(char a1[]) //receiving the CRC with AES encryption data from slave and checking
irayya 0:b3b7346e07fe 137 {
irayya 0:b3b7346e07fe 138 int i,j,k,l;
irayya 0:b3b7346e07fe 139 int rs=15;
irayya 0:b3b7346e07fe 140 v=0;
irayya 3:1250751bf7b0 141 /* output.printf("\n Receiver side : ");
irayya 3:1250751bf7b0 142 output.printf("\n Received Frame: ");*/
irayya 0:b3b7346e07fe 143
irayya 2:c0d73ae91788 144 for(int m=0; m<18; m++) {
irayya 1:fc4b4d69aa7a 145 printBinary(a1[m]);
irayya 1:fc4b4d69aa7a 146 output.printf("-");
irayya 1:fc4b4d69aa7a 147 }
irayya 3:1250751bf7b0 148 /*for(i=0; i<v; i++) {
irayya 0:b3b7346e07fe 149 output.printf("%d",binary1[i]);
irayya 3:1250751bf7b0 150 }*/
irayya 0:b3b7346e07fe 151 v=v-16;
irayya 0:b3b7346e07fe 152 int tf[v+16];
irayya 0:b3b7346e07fe 153 for(i=0; i<v+rs; i++) {
irayya 0:b3b7346e07fe 154 tf[i]=binary1[i];
irayya 0:b3b7346e07fe 155 }
irayya 3:1250751bf7b0 156 /*output.printf("\n");
irayya 3:1250751bf7b0 157 output.printf("The data to be Analyzed on the receiving side : ");*/
irayya 3:1250751bf7b0 158 /* for(i=0; i<v+rs; i++) {
irayya 0:b3b7346e07fe 159 output.printf("%d",tf[i]);
irayya 3:1250751bf7b0 160 }*/
irayya 0:b3b7346e07fe 161 int temp[v+16];
irayya 2:c0d73ae91788 162 int temp3[v+16];
irayya 0:b3b7346e07fe 163 for(i=0; i<v+rs; i++) {
irayya 0:b3b7346e07fe 164 temp[i]=tf[i];
irayya 3:1250751bf7b0 165 //temp3[i]=tf[i];
irayya 0:b3b7346e07fe 166 }
irayya 0:b3b7346e07fe 167
irayya 3:1250751bf7b0 168
irayya 3:1250751bf7b0 169 //Division
irayya 3:1250751bf7b0 170 for(i=0; i<v; i++) {
irayya 2:c0d73ae91788 171 j=0;
irayya 2:c0d73ae91788 172 k=i;
irayya 2:c0d73ae91788 173 if (temp[k]>=generator[j]) {
irayya 2:c0d73ae91788 174 for(j=0,k=i; j<16; j++,k++) {
irayya 3:1250751bf7b0 175 if(temp[k] == generator[j]) {
irayya 0:b3b7346e07fe 176 temp[k]=0;
irayya 0:b3b7346e07fe 177 } else {
irayya 0:b3b7346e07fe 178 temp[k]=1;
irayya 0:b3b7346e07fe 179 }
irayya 0:b3b7346e07fe 180 }
irayya 0:b3b7346e07fe 181 }
irayya 0:b3b7346e07fe 182 }
irayya 0:b3b7346e07fe 183
irayya 3:1250751bf7b0 184 output.printf("\n Reaminder: ");
irayya 0:b3b7346e07fe 185 int rrem[16];
irayya 0:b3b7346e07fe 186 for (i=v,j=0; i<v+rs; i++,j++) {
irayya 0:b3b7346e07fe 187 rrem[j]= temp[i];
irayya 0:b3b7346e07fe 188 }
irayya 0:b3b7346e07fe 189 for(i=0; i<rs; i++) {
irayya 0:b3b7346e07fe 190 output.printf("%d",rrem[i]);
irayya 0:b3b7346e07fe 191 }
irayya 0:b3b7346e07fe 192
irayya 0:b3b7346e07fe 193 int flag=0;
irayya 0:b3b7346e07fe 194 for(i=0; i<rs; i++) {
irayya 0:b3b7346e07fe 195 if(rrem[i]!=0) {
irayya 0:b3b7346e07fe 196 flag=1;
irayya 3:1250751bf7b0 197 break;
irayya 0:b3b7346e07fe 198 }
irayya 0:b3b7346e07fe 199 }
irayya 0:b3b7346e07fe 200
irayya 0:b3b7346e07fe 201 if(flag==0) {
irayya 0:b3b7346e07fe 202 //output.printf("\n Since Remainder Is 0 Hence Message Transmitted From Sender To Receriver Is Correct");
irayya 0:b3b7346e07fe 203 return 0;
irayya 1:fc4b4d69aa7a 204
irayya 0:b3b7346e07fe 205
irayya 0:b3b7346e07fe 206 } else {
irayya 1:fc4b4d69aa7a 207 // output.printf(" \n Since Remainder Is Not 0 Hence Message Transmitted From Sender To Receriver Contains Error");
irayya 1:fc4b4d69aa7a 208 return 1;
irayya 0:b3b7346e07fe 209 }
irayya 0:b3b7346e07fe 210 v=0;
irayya 0:b3b7346e07fe 211 }
irayya 0:b3b7346e07fe 212
irayya 0:b3b7346e07fe 213 void printBinary(char c)
irayya 0:b3b7346e07fe 214 {
irayya 0:b3b7346e07fe 215
irayya 2:c0d73ae91788 216 for (int i = 7; i >= 0; --i) { //binary data to be printing 8 bits for each cahracter
irayya 0:b3b7346e07fe 217 int x = ((c & (1 << i))? 1 : 0);
irayya 0:b3b7346e07fe 218 output.printf("%d",x);
irayya 0:b3b7346e07fe 219 binary1[v]=x;
irayya 0:b3b7346e07fe 220 v++;
irayya 0:b3b7346e07fe 221 }
irayya 2:c0d73ae91788 222 //printf("the value of v is given as %d",v);
irayya 0:b3b7346e07fe 223 }
irayya 0:b3b7346e07fe 224
irayya 0:b3b7346e07fe 225 void charBinary(int c1)
irayya 0:b3b7346e07fe 226 {
irayya 0:b3b7346e07fe 227 char x1 = ((c1 & 1)? '1' : '0');
irayya 0:b3b7346e07fe 228 // output.printf("%c",x1);
irayya 0:b3b7346e07fe 229 binary2[v1]=x1;
irayya 0:b3b7346e07fe 230 v1++;
irayya 0:b3b7346e07fe 231 }
irayya 0:b3b7346e07fe 232
irayya 0:b3b7346e07fe 233
irayya 0:b3b7346e07fe 234 /* ####### printChar function ########## */
irayya 0:b3b7346e07fe 235
irayya 0:b3b7346e07fe 236 void printChar(char x2[])
irayya 0:b3b7346e07fe 237 {
irayya 0:b3b7346e07fe 238
irayya 0:b3b7346e07fe 239 //memcpy(a, b, sizeof(a));
irayya 0:b3b7346e07fe 240 char *ON = x2 ;
irayya 0:b3b7346e07fe 241 output.printf("\n");
irayya 0:b3b7346e07fe 242 output.printf("%c",x2);
irayya 0:b3b7346e07fe 243 char subbuff[9];
irayya 2:c0d73ae91788 244 /*for(int j=0; j<sizeof(result1); j++) {
irayya 0:b3b7346e07fe 245 result1[j]='\0';
irayya 2:c0d73ae91788 246 }*/
irayya 0:b3b7346e07fe 247 unsigned char c3;
irayya 0:b3b7346e07fe 248 int k1;
irayya 0:b3b7346e07fe 249 int index = 0;
irayya 0:b3b7346e07fe 250 int fichero_len = (int)strlen(ON);
irayya 0:b3b7346e07fe 251
irayya 0:b3b7346e07fe 252 for(k1 = 0; k1 < fichero_len; k1 += 8) {
irayya 0:b3b7346e07fe 253 memcpy(subbuff, &ON[k1], 8); // <--- copy 8 butes only
irayya 0:b3b7346e07fe 254 subbuff[8] = '\0';
irayya 0:b3b7346e07fe 255 c3 = (unsigned char)strtol(subbuff, 0, 2);
irayya 0:b3b7346e07fe 256 //printf("\%s = %c = %d = 0x%.2X\n", subbuff, c3, c3, c3);
irayya 2:c0d73ae91788 257 result1[index] = c3;
irayya 2:c0d73ae91788 258 //result1[index] = '\0';
irayya 2:c0d73ae91788 259 index++;
irayya 0:b3b7346e07fe 260 }
irayya 0:b3b7346e07fe 261 printf("\nResult = %s\n", result1);
irayya 0:b3b7346e07fe 262
irayya 0:b3b7346e07fe 263 }