demo.c

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include "p256.h"

static void test(void)
{
    char *msg = "hi\n";
    unsigned char sig[64] = {
        /* r */
        0x6c,0x98,0xb6,0x80,0x9f,0x6e,0x2c,0x73,
        0x95,0xc6,0xc9,0xf1,0x8a,0x30,0x28,0x21,
        0xc5,0xf6,0x03,0x69,0xd3,0xab,0xd1,0x92,
        0xe9,0xe5,0xc4,0xf6,0x07,0xd5,0x18,0xd3,

        /* s */
        0x4a,0x9d,0x74,0xa0,0xf4,0x4c,0x61,0x03,
        0x13,0x30,0xa7,0xe3,0xf2,0x79,0x08,0xf5,
        0xc5,0x89,0xfe,0x64,0x27,0xdb,0x7c,0x3f,
        0x3f,0x74,0x09,0x55,0x9e,0x50,0x0c,0x3c
    };
    const unsigned char pk[] = {
        /* constant */ 0x04,

        /* x-coord */
        0x56,0x16,0xab,0x0d,0xf8,0x5a,0xc8,0x9c,
        0xc8,0x53,0xb8,0x4e,0x53,0xca,0xb5,0x35,
        0x22,0x4a,0x7d,0xbc,0x39,0x27,0x02,0x76,
        0xdd,0xa8,0x00,0x85,0x3e,0xe8,0xae,0x9b, 

        /* y-coord */
        0x68,0xb9,0x53,0x59,0x70,0x4f,0x87,0xe0,
        0x23,0x42,0x4d,0x5d,0x84,0x2f,0x08,0x21,
        0xd8,0x8c,0xe0,0x1f,0xb6,0xa8,0x1a,0x6a,
        0x1c,0x87,0x8a,0x81,0x13,0x0c,0x61,0x68
    };

    if (p256_verify((uint8_t *)msg, strlen(msg), sig, pk) != P256_SUCCESS) {
        printf("error\n");
    } else {
        printf("OK\n");
    }
    return;
}

int main(int argc, char **argv)
{
    (void)argc;
    (void)argv;
    test();
}