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/*
* Copyright (C) 2025 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*
* You can also choose to distribute this program under the terms of
* the Unmodified Binary Distribution Licence (as given in the file
* COPYING.UBDL), provided that you have satisfied its requirements.
*/
FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
/** @file
*
* Elliptic curve self-tests
*
*/
/* Forcibly enable assertions */
#undef NDEBUG
#include <stdint.h>
#include <string.h>
#include <assert.h>
#include <ipxe/bigint.h>
#include <ipxe/crypto.h>
#include <ipxe/test.h>
#include "elliptic_test.h"
/**
* Report elliptic curve sanity test result
*
* @v curve Elliptic curve
* @v file Test code file
* @v line Test code line
*/
void elliptic_curve_okx ( struct elliptic_curve *curve, const char *file,
unsigned int line ) {
static const uint8_t one[] = { 1 };
size_t pointsize = curve->pointsize;
size_t keysize = curve->keysize;
uint8_t point[pointsize];
uint8_t scalar[keysize];
struct {
bigint_t ( bigint_required_size ( keysize ) ) scalar;
bigint_t ( bigint_required_size ( keysize ) ) one;
} temp;
/* Check that curve has the required properties */
okx ( curve->base != NULL, file, line );
okx ( curve->order != NULL, file, line );
okx ( ( ! elliptic_is_infinity ( curve, curve->base ) ), file, line );
/* Test multiplying base point by group order. Result should
* be the point at infinity.
*/
okx ( elliptic_multiply ( curve, curve->base, curve->order,
point ) == 0, file, line );
okx ( elliptic_is_infinity ( curve, point ), file, line );
/* Test multiplying base point by group order plus one, to get
* back to the base point.
*/
bigint_init ( &temp.scalar, curve->order, keysize );
bigint_init ( &temp.one, one, sizeof ( one ) );
bigint_add ( &temp.one, &temp.scalar );
bigint_done ( &temp.scalar, scalar, sizeof ( scalar ) );
okx ( elliptic_multiply ( curve, curve->base, scalar, point ) == 0,
file, line );
okx ( memcmp ( point, curve->base, pointsize ) == 0, file, line );
}
/**
* Report elliptic curve point multiplication test result
*
* @v test Elliptic curve point multiplication test
* @v file Test code file
* @v line Test code line
*/
void elliptic_multiply_okx ( struct elliptic_multiply_test *test,
const char *file, unsigned int line ) {
struct elliptic_curve *curve = test->curve;
size_t pointsize = curve->pointsize;
size_t keysize = curve->keysize;
uint8_t actual[pointsize];
const void *base;
int rc;
/* Sanity checks */
okx ( ( test->base_len == pointsize ) || ( ! test->base_len ),
file, line );
okx ( test->scalar_len == keysize, file, line );
okx ( ( test->expected_len == pointsize ) || ( ! test->expected_len ),
file, line );
/* Perform point multiplication */
base = ( test->base_len ? test->base : curve->base );
rc = elliptic_multiply ( curve, base, test->scalar, actual );
if ( test->expected_len ) {
okx ( rc == 0, file, line );
} else {
okx ( rc != 0, file, line );
}
/* Check expected result */
okx ( memcmp ( actual, test->expected, test->expected_len ) == 0,
file, line );
}
/**
* Report elliptic curve point addition test result
*
* @v test Elliptic curve point addition test
* @v file Test code file
* @v line Test code line
*/
void elliptic_add_okx ( struct elliptic_add_test *test,
const char *file, unsigned int line ) {
struct elliptic_curve *curve = test->curve;
size_t pointsize = curve->pointsize;
uint8_t actual[pointsize];
int rc;
/* Sanity checks */
okx ( test->addend_len == pointsize, file, line );
okx ( test->augend_len == pointsize, file, line );
okx ( ( test->expected_len == pointsize ) || ( ! test->expected_len ),
file, line );
/* Perform point addition */
rc = elliptic_add ( curve, test->addend, test->augend, actual );
if ( test->expected_len ) {
okx ( rc == 0, file, line );
} else {
okx ( rc != 0, file, line );
}
/* Check expected result */
okx ( memcmp ( actual, test->expected, test->expected_len ) == 0,
file, line );
}
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