cryb-to/t/t_mpi.h
2017-04-06 19:51:47 +02:00

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/*
* Copyright (c) 2014-2017 Dag-Erling Smørgrav
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef T_MPI_H_INCLUDED
#define T_MPI_H_INCLUDED
/***************************************************************************
* Useful constants
*/
static const cryb_mpi z;
#define SMALL_V_SIZE (size_t)64
#define SMALL_E_SIZE (size_t)16
static uint8_t small_v[SMALL_V_SIZE];
static uint32_t small_e[SMALL_E_SIZE];
#define LARGE_V_SIZE (size_t)256
#define LARGE_E_SIZE (size_t)64
static uint8_t large_v[LARGE_V_SIZE];
static uint32_t large_e[LARGE_E_SIZE];
/***************************************************************************
* Utilities
*/
static void t_printv_mpi(const cryb_mpi *) CRYB_UNUSED;
/*
* Print an MPI in semi-human-readable form
*/
static void
t_printv_mpi(const cryb_mpi *x)
{
t_printv("%c", x->neg ? '-' : '+');
t_printv("%08x", x->msb == 0 ? 0 : x->words[0]);
for (unsigned int i = 1; i < (x->msb + 31) / 32; ++i)
t_printv(" %08x", x->words[i]);
}
/***************************************************************************
* Commonly used predicates
*/
static int t_mpi_not_grown(const cryb_mpi *) CRYB_UNUSED;
static int t_mpi_grown(const cryb_mpi *) CRYB_UNUSED;
static int t_mpi_is_zero(const cryb_mpi *) CRYB_UNUSED;
static int t_compare_mpi(const cryb_mpi *, const cryb_mpi *) CRYB_UNUSED;
/*
* Verify that an MPI has never grown.
*/
static int
t_mpi_not_grown(const cryb_mpi *x)
{
int ret = 1;
ret &= t_compare_ptr(x->swords, x->words);
ret &= t_compare_sz(CRYB_MPI_SWORDS, x->size);
return (ret);
}
/*
* Verify that an MPI has grown.
*/
static int
t_mpi_grown(const cryb_mpi *x)
{
int ret = 1;
/* XXX we need inequality predicates */
if (x->words == x->swords) {
t_printv("value was expected to change");
ret &= 0;
}
if (x->size == CRYB_MPI_SWORDS) {
t_printv("value was expected to change");
ret &= 0;
}
return (ret);
}
/*
* Verify that an MPI is zero.
*/
static int
t_mpi_is_zero(const cryb_mpi *x)
{
int ret = 1;
ret &= t_mpi_not_grown(x);
ret &= t_compare_mem(t_zero, x->words, CRYB_MPI_SWORDS);
ret &= t_compare_u(0, x->msb);
ret &= t_compare_i(0, x->neg);
return (ret);
}
/*
* Verify that an MPI has the expected value
*/
static int
t_compare_mpi(const cryb_mpi *e, const cryb_mpi *x)
{
int ret = 1;
if (e == x)
return (1);
if (e == NULL || x == NULL)
return (0);
if (x->words == NULL) {
t_printv("uninitialized MPI\n");
return (0);
}
if (e->neg != x->neg || e->msb != x->msb ||
memcmp(e->words, x->words, (e->msb + 7) / 8) != 0) {
t_printv("expected ");
t_printv_mpi(e);
t_printv("\n");
t_printv("received ");
t_printv_mpi(x);
t_printv("\n");
ret = 0;
}
return (ret);
}
/***************************************************************************
* Boilerplate
*/
static void t_mpi_prepare(void);
static void t_mpi_cleanup(void);
/*
* Initialize constants used in multiple test cases
*/
static void
t_mpi_prepare(void)
{
unsigned int i;
t_assert(sizeof small_e == sizeof small_v);
t_assert(sizeof small_e == sizeof z.swords);
for (i = 0; i < SMALL_V_SIZE; ++i)
small_v[i] = ~i;
for (i = 0; i < SMALL_E_SIZE; ++i)
small_e[SMALL_E_SIZE - 1 - i] = be32dec(small_v + i * 4);
t_assert(sizeof large_e == sizeof large_v);
t_assert(sizeof large_e > sizeof z.swords);
for (i = 0; i < LARGE_V_SIZE; ++i)
large_v[i] = ~i;
for (i = 0; i < LARGE_E_SIZE; ++i)
large_e[LARGE_E_SIZE - 1 - i] = be32dec(large_v + i * 4);
}
/*
* Cleanup and sanity checks
*/
static void
t_mpi_cleanup(void)
{
t_assert(memcmp(&z, t_zero, sizeof z) == 0);
}
#endif