Sample Bootloader SUIT validation

suit.cpp

/*
 * Copyright (C) 2018 Freie Universitat Berlin
 * Copyright (C) 2018 Inria
 *
 * This file is subject to the terms and conditions of the GNU Lesser
 * General Public License v2.1. See the file LICENSE in the top level
 * directory for more details.
 */

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "cose/crypto.h"
#include "cose.h"
#include "cose_defines.h"
#include "mbed.h"

#include "cose/test.h"

static uint8_t buf[2048];

#define CU_ASSERT(A) A
#define CU_ASSERT_EQUAL(A,B) CU_ASSERT(A)
#define CU_ASSERT_EQUAL_FATAL(A,B) CU_ASSERT(A)

static const unsigned char cose_suite[] = {
  0xd8, 0x62, 0x84, 0x44, 0xa1, 0x03, 0x18, 0x2a, 0xa0, 0x58, 0xcd, 0x8a,
  0x02, 0xa4, 0x01, 0x6e, 0x54, 0x68, 0x69, 0x73, 0x20, 0x69, 0x73, 0x20,
  0x61, 0x20, 0x74, 0x65, 0x73, 0x74, 0x02, 0x6e, 0x41, 0x20, 0x74, 0x65,
  0x73, 0x74, 0x20, 0x70, 0x61, 0x79, 0x6c, 0x6f, 0x61, 0x64, 0x03, 0x6f,
  0x41, 0x20, 0x73, 0x61, 0x6d, 0x70, 0x6c, 0x65, 0x20, 0x76, 0x65, 0x6e,
  0x64, 0x6f, 0x72, 0x04, 0x75, 0x41, 0x6e, 0x20, 0x65, 0x78, 0x70, 0x65,
  0x72, 0x69, 0x6d, 0x65, 0x6e, 0x74, 0x61, 0x6c, 0x20, 0x6d, 0x6f, 0x64,
  0x65, 0x6c, 0x50, 0xb5, 0x93, 0x36, 0xf0, 0x59, 0xf4, 0xdc, 0x45, 0x77,
  0x3d, 0x2a, 0x51, 0xff, 0xa5, 0x62, 0xbc, 0x1a, 0x5b, 0x16, 0x6d, 0x2e,
  0x82, 0x82, 0x01, 0x50, 0xfa, 0x6b, 0x4a, 0x53, 0xd5, 0xad, 0x5f, 0xdf,
  0xbe, 0x9d, 0xe6, 0x63, 0xe4, 0xd4, 0x1f, 0xfe, 0x82, 0x02, 0x50, 0x14,
  0x92, 0xaf, 0x14, 0x25, 0x69, 0x5e, 0x48, 0xbf, 0x42, 0x9b, 0x2d, 0x51,
  0xf2, 0xab, 0x45, 0xf6, 0xf6, 0xf6, 0xf6, 0x87, 0x81, 0x01, 0x10, 0x43,
  0x66, 0x6f, 0x6f, 0x81, 0x82, 0x6e, 0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f,
  0x2f, 0x66, 0x6f, 0x6f, 0x2e, 0x63, 0x6f, 0x6d, 0x01, 0x81, 0x01, 0xa1,
  0x01, 0x58, 0x20, 0xc3, 0x12, 0x11, 0xd1, 0xff, 0x88, 0xf7, 0x7a, 0x5a,
  0xaf, 0x65, 0x36, 0x77, 0x89, 0x5b, 0xfc, 0xa7, 0x69, 0xf0, 0x6d, 0xa1,
  0x98, 0xa8, 0xfa, 0x71, 0x15, 0x6a, 0xa6, 0x4a, 0xcd, 0x69, 0x5d, 0xf6,
  0x81, 0x83, 0x58, 0x26, 0xa2, 0x01, 0x26, 0x04, 0x58, 0x20, 0x3a, 0x65,
  0x52, 0x7d, 0x1a, 0xc9, 0x2c, 0x47, 0x22, 0xc9, 0x19, 0xb3, 0x87, 0xad,
  0xc9, 0xbc, 0x95, 0x57, 0x98, 0x27, 0x03, 0xa1, 0x69, 0xa0, 0xa4, 0x3f,
  0xb4, 0x72, 0xa3, 0xa4, 0xcf, 0xc1, 0xa0, 0x58, 0x47, 0x30, 0x45, 0x02,
  0x21, 0x00, 0xde, 0xbb, 0xd0, 0x12, 0xfb, 0xb9, 0x2f, 0xca, 0x04, 0xc3,
  0x52, 0xc4, 0xe5, 0x93, 0xbd, 0x77, 0x86, 0xd4, 0x18, 0x3b, 0x22, 0xce,
  0xd1, 0xf8, 0xe4, 0x5e, 0x33, 0xba, 0x93, 0x55, 0x5f, 0x05, 0x02, 0x20,
  0x1f, 0x0a, 0x4a, 0x8c, 0xa9, 0x1f, 0x19, 0x13, 0x26, 0x07, 0xb6, 0xa3,
  0xce, 0x54, 0x43, 0xb4, 0x4d, 0x55, 0x8f, 0xa5, 0xc8, 0xbc, 0xf4, 0xc4,
  0x76, 0x38, 0x89, 0x67, 0xc7, 0x88, 0x79, 0x7f
};

static unsigned char pk_x[MBEDTLS_ECP_MAX_BYTES] = {
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x5b, 0x69, 0xb5, 0x30, 0x6d, 0xf5, 0x5c, 0xf8, 0x0a, 0xd0, 0xa9, 0x8c,
    0xa5, 0x76, 0x1c, 0xdc, 0x10, 0x48, 0x3f, 0x29, 0x86, 0xaf, 0xec, 0x56,
    0x7c, 0xf9, 0xbf, 0xb1, 0xa8, 0x5e, 0x66, 0x92,
};
static unsigned char pk_y[MBEDTLS_ECP_MAX_BYTES] = {
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
    0x2e, 0xbf, 0xef, 0xa9, 0xd3, 0x57, 0x75, 0x72, 0xb4, 0x90, 0x25, 0xcc,
    0x44, 0x76, 0xee, 0xc9, 0xdd, 0xc5, 0x16, 0xb0, 0x49, 0x5f, 0xdd, 0x4e,
    0x7c, 0xa0, 0x65, 0x21, 0x26, 0x71, 0xba, 0x5e
};

static void print_bytestr(const uint8_t *bytes, size_t len)
{
    for(unsigned int idx=0; idx < len; idx++)
    {
        printf("%02X", bytes[idx]);
    }
}
    DigitalOut green(PA5);

int main(void)
{
    green = 1;
    wait(1);

    cose_sign_t verify;
    cose_key_t signer;
    cose_signature_t signature;
    const uint8_t *kid = NULL;
    /* Initialize struct */
    cose_sign_init(&verify, 0);

    /* First signer */
    cose_key_init(&signer);
    cose_key_set_keys(&signer, COSE_EC_CURVE_P256, COSE_ALGO_ES256, pk_x, pk_y, NULL);

    printf("COSE bytestream: \n");
    print_bytestr(cose_suite, sizeof(cose_suite));
    printf("\n");
    /* Decode again */
    int decode_success = cose_sign_decode(&verify, cose_suite, sizeof(cose_suite));
    printf("Decoding: %d\n", decode_success);
    /* Verify with signature slot 0 */
    CU_ASSERT_EQUAL_FATAL(decode_success, 0);

    cose_sign_iter_t iter;
    cose_sign_iter_init(&verify, &iter);
    CU_ASSERT(cose_sign_iter(&iter, &signature));

    int verification = cose_sign_verify(&verify, &signature, &signer, buf, sizeof(buf));
    printf("Verification: %d\n", verification);
    CU_ASSERT_EQUAL(verification, 0);
    cose_hdr_t hdr;
    CU_ASSERT(cose_sign_get_protected(&verify, &hdr, COSE_HDR_CONTENT_TYPE));
    CU_ASSERT_EQUAL(hdr.v.value, 42);
    ssize_t res = cose_signature_get_kid(&signature, &kid);
    CU_ASSERT(res);
    //CU_ASSERT_EQUAL(memcmp(kid, keyid, sizeof(keyid) - 1), 0);
    printf("Verify Result: %d\n", res);
}