path: root/stm32_driver/ecdsa256_driver_sample.c

		//
		// simple driver to test "ecdsa384" core in hardware
		//
		
		//
		// note, that the test program needs a custom bitstream where
		// the core is located at offset 0 (without the core selector)
		//

		// stm32 headers
#include "stm-init.h"
#include "stm-led.h"
#include "stm-fmc.h"

		// locations of core registers
#define CORE_ADDR_NAME0					(0x00 << 2)
#define CORE_ADDR_NAME1					(0x01 << 2)
#define CORE_ADDR_VERSION				(0x02 << 2)
#define CORE_ADDR_CONTROL				(0x08 << 2)
#define CORE_ADDR_STATUS				(0x09 << 2)

		// locations of data buffers
#define CORE_ADDR_BUF_K					(0x20 << 2)
#define CORE_ADDR_BUF_X					(0x28 << 2)
#define CORE_ADDR_BUF_Y					(0x30 << 2)

		// bit maps
#define CORE_CONTROL_BIT_NEXT		0x00000002
#define CORE_STATUS_BIT_READY		0x00000002

		// curve selection
#define USE_CURVE								1

#include "ecdsa_model.h"

#define BUF_NUM_WORDS		(OPERAND_WIDTH / (sizeof(uint32_t) << 3))	// 8

		//
		// test vectors
		//
static const uint32_t p256_d[BUF_NUM_WORDS]  = ECDSA_D;
static const uint32_t p256_qx[BUF_NUM_WORDS] = ECDSA_Q_X;
static const uint32_t p256_qy[BUF_NUM_WORDS] = ECDSA_Q_Y;

static const uint32_t p256_k[BUF_NUM_WORDS]  = ECDSA_K;
static const uint32_t p256_rx[BUF_NUM_WORDS] = ECDSA_R_X;
static const uint32_t p256_ry[BUF_NUM_WORDS] = ECDSA_R_Y;

static const uint32_t p256_i[BUF_NUM_WORDS]  = ECDSA_ONE;
static const uint32_t p256_gx[BUF_NUM_WORDS] = ECDSA_G_X;
static const uint32_t p256_gy[BUF_NUM_WORDS] = ECDSA_G_Y;

static const uint32_t p256_z[BUF_NUM_WORDS]  = ECDSA_ZERO;
static const uint32_t p256_n[BUF_NUM_WORDS]  = ECDSA_N;

		//
		// prototypes
		//
void toggle_yellow_led(void);
int test_p256_multiplier(const uint32_t *k, const uint32_t *px, const uint32_t *py);

		//
		// test routine
		//
int main()
{
		int ok;
	
    stm_init();
    fmc_init();
	
    led_on(LED_GREEN);
    led_off(LED_RED);
	
    led_off(LED_YELLOW);
    led_off(LED_BLUE);
		
		uint32_t core_name0;
		uint32_t core_name1;
	
		fmc_read_32(CORE_ADDR_NAME0, &core_name0);
		fmc_read_32(CORE_ADDR_NAME1, &core_name1);

			// "ecds", "a256"
		if ((core_name0 != 0x65636473) || (core_name1 != 0x61323536))
		{
				led_off(LED_GREEN);
				led_on(LED_RED);
				while (1);
		}

			// repeat forever
		while (1)
		{		
				ok = 1;
				ok = ok && test_p256_multiplier(p256_d, p256_qx, p256_qy);
				ok = ok && test_p256_multiplier(p256_k, p256_rx, p256_ry);
				ok = ok && test_p256_multiplier(p256_z, p256_z,  p256_z);
				ok = ok && test_p256_multiplier(p256_i, p256_gx, p256_gy);
				ok = ok && test_p256_multiplier(p256_n, p256_z,  p256_z);
	
				if (!ok)
				{		led_off(LED_GREEN);
						led_on(LED_RED);
				}
				
				toggle_yellow_led();
		}
}

	
		//
		// this routine uses the hardware multiplier to obtain Q(qx,qy), which is the
		// scalar multiple of the base point, qx and qy are then compared to the values
		// px and py (correct result known in advance)
		//
int test_p256_multiplier(const uint32_t *k, const uint32_t *px, const uint32_t *py)
{
		int i, num_cyc;
		uint32_t reg_control, reg_status;
		uint32_t k_word, qx_word, qy_word;
	
				// fill k
		for (i=0; i<BUF_NUM_WORDS; i++)
		{		k_word = k[i];
				fmc_write_32(CORE_ADDR_BUF_K + ((BUF_NUM_WORDS - (i + 1)) * sizeof(uint32_t)), &k_word);
		}

				// clear 'next' control bit, then set 'next' control bit again to trigger new operation
		reg_control = 0;
		fmc_write_32(CORE_ADDR_CONTROL, &reg_control);
		reg_control = CORE_CONTROL_BIT_NEXT;
		fmc_write_32(CORE_ADDR_CONTROL, &reg_control);
	
				// wait for 'ready' status bit to be set
		num_cyc = 0;
		do
		{		num_cyc++;
				fmc_read_32(CORE_ADDR_STATUS, &reg_status);
		}
		while (!(reg_status & CORE_STATUS_BIT_READY));
	
				// read back x and y word-by-word, then compare to the reference values
		for (i=0; i<BUF_NUM_WORDS; i++)
		{		
				fmc_read_32(CORE_ADDR_BUF_X + (i * sizeof(uint32_t)), &qx_word);
				fmc_read_32(CORE_ADDR_BUF_Y + (i * sizeof(uint32_t)), &qy_word);
			
				if ((qx_word != px[BUF_NUM_WORDS - (i + 1)])) return 0;
				if ((qy_word != py[BUF_NUM_WORDS - (i + 1)])) return 0;
		}
	
				// everything went just fine
		return 1;
}

		//
		// toggle the yellow led to indicate that we're not stuck somewhere
		//
void toggle_yellow_led(void)
{
		static int led_state = 0;
	
		led_state = !led_state;
	
		if (led_state) led_on(LED_YELLOW);
		else           led_off(LED_YELLOW);
}


		//
		// end of file
		//