speck_cpa_cw/cw_firmware/simple-speck.c

#include "hal.h"
#include <stdint.h>
#include <stdlib.h>

#include "simpleserial.h"
#include "speck.h"

u8 gkey[32] = {0x00};


uint8_t get_key(uint8_t* k, uint8_t len) {
	// Load key here
	simpleserial_put('o', 32, gkey);
	return 0x00;
}

uint8_t set_key(uint8_t* key, uint8_t len) {

    // copy keybytes
    memcpy(gkey, key, 32);
    simpleserial_put('o', 32, gkey);
    return 0x00;
}

uint8_t get_pt(uint8_t* pt, uint8_t len) {
	/**********************************
	* Start user-specific code here. */
	trigger_high();

	//16 hex bytes held in 'pt' were sent
	//from the computer. Store your response
	//back into 'pt', which will send 16 bytes
	//back to computer. Can ignore of course if
	//not needed

        volatile uint8_t ppp[] = {0x42, 0x41, 0x41, 0x41,0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 };


	trigger_low();
	/* End user-specific code here. *
	********************************/
	simpleserial_put('r', 16, ppp);

	return 0x00;
}


uint8_t encrypt_block(uint8_t* pt, uint8_t len) {

    trigger_high(); // TRIGGER START


    //u8 pt[16] = {0x70, 0x6f, 0x6f, 0x6e, 0x65, 0x72, 0x2e, 0x20, 0x49, 0x6e, 0x20, 0x74, 0x68, 0x6f, 0x73, 0x65};
    u8 key[32] = {0x00};
    memcpy(key, gkey, 32); // copy the globally set encryption key
    u8 ct[16] = {0x00};
    EncryptBlock(pt, key, ct);

    trigger_low(); // TRIGGER STOP

    simpleserial_put('c', 16, ct);
    return 0x00;
}


uint8_t reset(uint8_t* x, uint8_t len) {
	simpleserial_put('r', 0, NULL);
	// Reset key here if needed
	return 0x00;
}


int main(void) {
    platform_init();
	init_uart();
	trigger_setup();

 	/* Uncomment this to get a HELLO message for debug */
	putch('h');
	putch('e');
	putch('l');
	putch('l');
	putch('o');
	putch('\n');

	simpleserial_init();
	simpleserial_addcmd('p', 16, get_pt);
	simpleserial_addcmd('l', 0, get_pt);
	simpleserial_addcmd('e', 16, encrypt_block);
	simpleserial_addcmd('k', 16, get_key);
	simpleserial_addcmd('s', 32, set_key);
	simpleserial_addcmd('x', 0, reset);

	while(1)
		simpleserial_get();
}