Stephen Ralph / Mbed 2 deprecated CryptoPenDecrypt

Pt. 4 | Encryption encrypt program

Dependencies:   mbed 4DGL-uLCD-SE SDFileSystem PinDetect

main.cpp@0:72aeef60e1fc, 2019-01-03 (annotated)

Committer:
sralph3
Date:
Thu Jan 03 22:40:26 2019 +0000
Revision:
0:72aeef60e1fc
Pt. 4 | Encryption encrypt program

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sralph3 0:72aeef60e1fc 1 #include "mbed.h"
sralph3 0:72aeef60e1fc 2 #include "PinDetect.h"
sralph3 0:72aeef60e1fc 3 #include "uLCD_4DGL.h"
sralph3 0:72aeef60e1fc 4 #include "SDFileSystem.h"
sralph3 0:72aeef60e1fc 5 #include "Letter.h"
sralph3 0:72aeef60e1fc 6 uLCD_4DGL uLCD(p28, p27, p29); // serial tx, serial rx, reset pin;
sralph3 0:72aeef60e1fc 7 SDFileSystem sd(p5, p6, p7, p8, "sd");
sralph3 0:72aeef60e1fc 8
sralph3 0:72aeef60e1fc 9 //declare objects for pins used with pushbuttons
sralph3 0:72aeef60e1fc 10 PinDetect pb1(p18);
sralph3 0:72aeef60e1fc 11 PinDetect pb2(p17);
sralph3 0:72aeef60e1fc 12 PinDetect pb3(p16);
sralph3 0:72aeef60e1fc 13
sralph3 0:72aeef60e1fc 14 //Populate arrayCipher from cipher on SD
sralph3 0:72aeef60e1fc 15 char arrayCipher [1001];
sralph3 0:72aeef60e1fc 16
sralph3 0:72aeef60e1fc 17 enum InputType {FWD,BACK,ENC,NON};
sralph3 0:72aeef60e1fc 18 enum StateType {Q0, Q1, Q2, Q3};
sralph3 0:72aeef60e1fc 19 Letter currLetter;
sralph3 0:72aeef60e1fc 20 int position=0;
sralph3 0:72aeef60e1fc 21 FILE *fp2;
sralph3 0:72aeef60e1fc 22
sralph3 0:72aeef60e1fc 23 InputType input = NON;
sralph3 0:72aeef60e1fc 24 StateType state = Q0;
sralph3 0:72aeef60e1fc 25
sralph3 0:72aeef60e1fc 26 //Encrypt
sralph3 0:72aeef60e1fc 27 char decrypt (char inp, char arrayCipher[], int startPt)
sralph3 0:72aeef60e1fc 28 {
sralph3 0:72aeef60e1fc 29 int sum = (inp-65)-(arrayCipher[startPt]-65) + 26;
sralph3 0:72aeef60e1fc 30 sum = sum % 26;
sralph3 0:72aeef60e1fc 31 char sumC = sum;
sralph3 0:72aeef60e1fc 32 return sumC+65;
sralph3 0:72aeef60e1fc 33 }
sralph3 0:72aeef60e1fc 34
sralph3 0:72aeef60e1fc 35 // Callback routine is interrupt activated by a debounced pb3 hit
sralph3 0:72aeef60e1fc 36 void pb3_hit_callback (void)
sralph3 0:72aeef60e1fc 37 {
sralph3 0:72aeef60e1fc 38 if (state==Q0){
sralph3 0:72aeef60e1fc 39 uLCD.cls();
sralph3 0:72aeef60e1fc 40 uLCD.printf("DECRYPTING");
sralph3 0:72aeef60e1fc 41 wait(1.0);
sralph3 0:72aeef60e1fc 42 char inC = currLetter.getChar();
sralph3 0:72aeef60e1fc 43 char outC=decrypt(inC, arrayCipher, position);
sralph3 0:72aeef60e1fc 44 uLCD.cls();
sralph3 0:72aeef60e1fc 45 uLCD.text_width(5);
sralph3 0:72aeef60e1fc 46 uLCD.text_height(5);
sralph3 0:72aeef60e1fc 47 uLCD.printf("%c", outC);
sralph3 0:72aeef60e1fc 48 position++;
sralph3 0:72aeef60e1fc 49
sralph3 0:72aeef60e1fc 50 //update position in txt doc
sralph3 0:72aeef60e1fc 51 fp2 = fopen("/sd/mydir/positionCipherReceiver.txt", "w");
sralph3 0:72aeef60e1fc 52 if(fp2 == NULL) {
sralph3 0:72aeef60e1fc 53 uLCD.printf("Error Open \n");
sralph3 0:72aeef60e1fc 54 }
sralph3 0:72aeef60e1fc 55 else{
sralph3 0:72aeef60e1fc 56 fprintf(fp2, "%i",position);
sralph3 0:72aeef60e1fc 57 fclose(fp2);
sralph3 0:72aeef60e1fc 58 }
sralph3 0:72aeef60e1fc 59
sralph3 0:72aeef60e1fc 60 wait(1.0);
sralph3 0:72aeef60e1fc 61 input = ENC;
sralph3 0:72aeef60e1fc 62 }
sralph3 0:72aeef60e1fc 63 else{
sralph3 0:72aeef60e1fc 64 input=ENC;
sralph3 0:72aeef60e1fc 65 }
sralph3 0:72aeef60e1fc 66
sralph3 0:72aeef60e1fc 67 }
sralph3 0:72aeef60e1fc 68 // Callback routine is interrupt activated by a debounced pb1 hit
sralph3 0:72aeef60e1fc 69 void pb1_hit_callback (void)
sralph3 0:72aeef60e1fc 70 {
sralph3 0:72aeef60e1fc 71 // ADD CODE HERE THAT YOU WHAT TO RUN WHEN INTERUPT IS GENERATED
sralph3 0:72aeef60e1fc 72 currLetter.inc();
sralph3 0:72aeef60e1fc 73 }
sralph3 0:72aeef60e1fc 74
sralph3 0:72aeef60e1fc 75 // Callback routine is interrupt activated by a debounced pb2 hit
sralph3 0:72aeef60e1fc 76 void pb2_hit_callback (void)
sralph3 0:72aeef60e1fc 77 {
sralph3 0:72aeef60e1fc 78 currLetter.dec();
sralph3 0:72aeef60e1fc 79 }
sralph3 0:72aeef60e1fc 80
sralph3 0:72aeef60e1fc 81
sralph3 0:72aeef60e1fc 82 int main() {
sralph3 0:72aeef60e1fc 83
sralph3 0:72aeef60e1fc 84 FILE *fp = fopen("/sd/mydir/OTP.txt", "r");
sralph3 0:72aeef60e1fc 85 if(fp == NULL){
sralph3 0:72aeef60e1fc 86 uLCD.printf("Open Error!!!\n");
sralph3 0:72aeef60e1fc 87 }
sralph3 0:72aeef60e1fc 88 else{
sralph3 0:72aeef60e1fc 89 fscanf(fp, "%s", arrayCipher);
sralph3 0:72aeef60e1fc 90 fclose(fp);
sralph3 0:72aeef60e1fc 91 }
sralph3 0:72aeef60e1fc 92
sralph3 0:72aeef60e1fc 93 FILE *fp2 = fopen("/sd/mydir/positionCipherReceiver.txt", "r");
sralph3 0:72aeef60e1fc 94 if(fp2 == NULL) {
sralph3 0:72aeef60e1fc 95 uLCD.printf("Open Error!!!\n");
sralph3 0:72aeef60e1fc 96 }
sralph3 0:72aeef60e1fc 97 else{
sralph3 0:72aeef60e1fc 98 fscanf(fp2, "%i",&position);
sralph3 0:72aeef60e1fc 99 fclose(fp2);
sralph3 0:72aeef60e1fc 100 }
sralph3 0:72aeef60e1fc 101
sralph3 0:72aeef60e1fc 102 // int sizeIn = sizeof(inChars)/sizeof(*inChars);
sralph3 0:72aeef60e1fc 103
sralph3 0:72aeef60e1fc 104
sralph3 0:72aeef60e1fc 105 pb1.mode(PullUp);
sralph3 0:72aeef60e1fc 106 pb2.mode(PullUp);
sralph3 0:72aeef60e1fc 107 pb3.mode(PullUp);
sralph3 0:72aeef60e1fc 108
sralph3 0:72aeef60e1fc 109 // Delay for initial pullup to take effect
sralph3 0:72aeef60e1fc 110 wait(.01);
sralph3 0:72aeef60e1fc 111
sralph3 0:72aeef60e1fc 112 // Setup Interrupt callback functions for a pb hit
sralph3 0:72aeef60e1fc 113 pb1.attach_deasserted(&pb1_hit_callback);
sralph3 0:72aeef60e1fc 114 pb2.attach_deasserted(&pb2_hit_callback);
sralph3 0:72aeef60e1fc 115 pb3.attach_deasserted(&pb3_hit_callback);
sralph3 0:72aeef60e1fc 116
sralph3 0:72aeef60e1fc 117 // Start sampling pb inputs using interrupts
sralph3 0:72aeef60e1fc 118 pb1.setSampleFrequency(); //default is 20KHz sampling
sralph3 0:72aeef60e1fc 119 pb2.setSampleFrequency();
sralph3 0:72aeef60e1fc 120 pb3.setSampleFrequency();
sralph3 0:72aeef60e1fc 121 // pushbuttons now setup and running
sralph3 0:72aeef60e1fc 122
sralph3 0:72aeef60e1fc 123 while(1) {
sralph3 0:72aeef60e1fc 124 switch(state){
sralph3 0:72aeef60e1fc 125 case(Q0):
sralph3 0:72aeef60e1fc 126 //Produce output for this state
sralph3 0:72aeef60e1fc 127 uLCD.locate(0,0);
sralph3 0:72aeef60e1fc 128 uLCD.text_width(5);
sralph3 0:72aeef60e1fc 129 uLCD.text_height(5);
sralph3 0:72aeef60e1fc 130 uLCD.printf("%c",currLetter.getChar());
sralph3 0:72aeef60e1fc 131 wait(.5);
sralph3 0:72aeef60e1fc 132 //calculate next state
sralph3 0:72aeef60e1fc 133 if (input == ENC){
sralph3 0:72aeef60e1fc 134 state = Q1;
sralph3 0:72aeef60e1fc 135 input=NON;
sralph3 0:72aeef60e1fc 136 uLCD.cls();
sralph3 0:72aeef60e1fc 137 }
sralph3 0:72aeef60e1fc 138 else{ //input should be stay
sralph3 0:72aeef60e1fc 139 state = Q0;
sralph3 0:72aeef60e1fc 140 }
sralph3 0:72aeef60e1fc 141 break;
sralph3 0:72aeef60e1fc 142
sralph3 0:72aeef60e1fc 143 case (Q1):
sralph3 0:72aeef60e1fc 144 //Produce output for this state
sralph3 0:72aeef60e1fc 145
sralph3 0:72aeef60e1fc 146 uLCD.locate(0,0);
sralph3 0:72aeef60e1fc 147 uLCD.text_width(1);
sralph3 0:72aeef60e1fc 148 uLCD.text_height(1);
sralph3 0:72aeef60e1fc 149 uLCD.printf("Press Again To Decrypt More");
sralph3 0:72aeef60e1fc 150 //calculate next state
sralph3 0:72aeef60e1fc 151 if (input == ENC){
sralph3 0:72aeef60e1fc 152 state = Q0;
sralph3 0:72aeef60e1fc 153 input = NON;
sralph3 0:72aeef60e1fc 154 uLCD.cls();
sralph3 0:72aeef60e1fc 155 }
sralph3 0:72aeef60e1fc 156 else //input should be stay
sralph3 0:72aeef60e1fc 157 state = Q1;
sralph3 0:72aeef60e1fc 158 break;
sralph3 0:72aeef60e1fc 159
sralph3 0:72aeef60e1fc 160 }
sralph3 0:72aeef60e1fc 161 //end switch
sralph3 0:72aeef60e1fc 162 wait (0.1);
sralph3 0:72aeef60e1fc 163 }
sralph3 0:72aeef60e1fc 164 }