test/test_compress.c

/* Copyright 2014, Kenneth MacKay. Licensed under the BSD 2-clause license. */

#include "uECC.h"

#include <stdio.h>
#include <string.h>

#ifndef uECC_TEST_NUMBER_OF_ITERATIONS
#define uECC_TEST_NUMBER_OF_ITERATIONS   256
#endif

void vli_print(char *str, uint8_t *vli, unsigned int size) {
    printf("%s ", str);
    for(unsigned i=0; i<size; ++i) {
        printf("%02X ", (unsigned)vli[i]);
    }
    printf("\n");
}

int main() {
    uint8_t public[64];
    uint8_t private[32];
    uint8_t compressed_point[33];
    uint8_t decompressed_point[64];

    int i;
    int c;
    
    const struct uECC_Curve_t * curves[5];
    curves[0] = uECC_secp160r1();
    curves[1] = uECC_secp192r1();
    curves[2] = uECC_secp224r1();
    curves[3] = uECC_secp256r1();
    curves[4] = uECC_secp256k1();
    
    printf("Testing compression and decompression of %d random EC points\n",
           uECC_TEST_NUMBER_OF_ITERATIONS);

    for (c = 0; c < 5; ++c) {
        for (i = 0; i < uECC_TEST_NUMBER_OF_ITERATIONS; ++i) {
            printf(".");
            fflush(stdout);
            
            memset(public, 0, sizeof(public));
            memset(decompressed_point, 0, sizeof(decompressed_point));

            /* Generate arbitrary EC point (public) on Curve */
            if (!uECC_make_key(public, private, curves[c])) {
                printf("uECC_make_key() failed\n");
                continue;
            }

            /* compress and decompress point */
            uECC_compress(public, compressed_point, curves[c]);
            uECC_decompress(compressed_point, decompressed_point, curves[c]);

            if (memcmp(public, decompressed_point, sizeof(public)) != 0) {
                printf("Original and decompressed points are not identical!\n");
                vli_print("Original point =     ", public, sizeof(public));
                vli_print("Compressed point =   ", compressed_point, sizeof(compressed_point));
                vli_print("Decompressed point = ", decompressed_point, sizeof(decompressed_point));
            }
        }
        printf("\n");
    }

    return 0;
}