static int s_fill_in_public_key_info()

in source/unix/opensslcrypto_ecc.c [84:122]

• 29 lines of code
• 4 McCabe index (conditional complexity)

static int s_fill_in_public_key_info(
    struct libcrypto_ecc_key *libcrypto_key_pair,
    const EC_GROUP *group,
    const EC_POINT *pub_key_point) {
    BIGNUM *big_num_x = BN_new();
    BIGNUM *big_num_y = BN_new();

    int ret_val = AWS_OP_ERR;

    if (EC_POINT_get_affine_coordinates_GFp(group, pub_key_point, big_num_x, big_num_y, NULL) != 1) {
        aws_raise_error(AWS_ERROR_INVALID_STATE);
        goto clean_up;
    }

    size_t x_coor_size = BN_num_bytes(big_num_x);
    size_t y_coor_size = BN_num_bytes(big_num_y);

    if (aws_byte_buf_init(&libcrypto_key_pair->key_pair.pub_x, libcrypto_key_pair->key_pair.allocator, x_coor_size)) {
        goto clean_up;
    }

    if (aws_byte_buf_init(&libcrypto_key_pair->key_pair.pub_y, libcrypto_key_pair->key_pair.allocator, y_coor_size)) {
        goto clean_up;
    }

    BN_bn2bin(big_num_x, libcrypto_key_pair->key_pair.pub_x.buffer);
    BN_bn2bin(big_num_y, libcrypto_key_pair->key_pair.pub_y.buffer);

    libcrypto_key_pair->key_pair.pub_x.len = x_coor_size;
    libcrypto_key_pair->key_pair.pub_y.len = y_coor_size;

    ret_val = AWS_OP_SUCCESS;

clean_up:
    BN_free(big_num_x);
    BN_free(big_num_y);

    return ret_val;
}