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tests/sys/devrandom/uint128_test.c

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/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 2019 Conrad Meyer <cem@FreeBSD.org>
* 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.
*
* 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.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/random.h>
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdbool.h>
#include <crypto/chacha20/chacha.h>
#include <crypto/rijndael/rijndael-api-fst.h>
#include <crypto/sha2/sha256.h>
#include <dev/random/hash.h>
#include <dev/random/uint128.h>
#include <atf-c.h>
static void
vec_u32_tole128(uint8_t dst[static 16], const uint32_t src[static 4])
{
le32enc(dst, src[0]);
le32enc(&dst[4], src[1]);
le32enc(&dst[8], src[2]);
le32enc(&dst[12], src[3]);
}
static void
le128_to_vec_u32(uint32_t dst[static 4], const uint8_t src[static 16])
{
dst[0] = le32dec(src);
dst[1] = le32dec(&src[4]);
dst[2] = le32dec(&src[8]);
dst[3] = le32dec(&src[12]);
}
static void
formatu128(char buf[static 52], uint128_t x)
{
uint8_t le128x[16];
uint32_t vx[4];
size_t sz, i;
int rc;
le128enc(le128x, x);
le128_to_vec_u32(vx, le128x);
sz = 52;
for (i = 0; i < 4; i++) {
rc = snprintf(buf, sz, "0x%x ", vx[i]);
ATF_REQUIRE(rc > 0 && (size_t)rc < sz);
buf += rc;
sz -= rc;
}
/* Delete last trailing space */
buf[-1] = '\0';
}
static void
u128_check_equality(uint128_t a, uint128_t b, const char *descr)
{
char fmtbufa[52], fmtbufb[52];
formatu128(fmtbufa, a);
formatu128(fmtbufb, b);
ATF_CHECK_MSG(uint128_equals(a, b),
"Expected: [%s] != Actual: [%s]: %s", fmtbufa, fmtbufb, descr);
}
ATF_TC_WITHOUT_HEAD(uint128_inc);
ATF_TC_BODY(uint128_inc, tc)
{
static const struct u128_inc_tc {
uint32_t input[4];
uint32_t expected[4];
const char *descr;
} tests[] = {
{
.input = { 0, 0, 0, 0 },
.expected = { 1, 0, 0, 0 },
.descr = "0 -> 1",
},
{
.input = { 1, 0, 0, 0 },
.expected = { 2, 0, 0, 0 },
.descr = "0 -> 2",
},
{
.input = { 0xff, 0, 0, 0 },
.expected = { 0x100, 0, 0, 0 },
.descr = "0xff -> 0x100 (byte carry)",
},
{
.input = { UINT32_MAX, 0, 0, 0 },
.expected = { 0, 1, 0, 0 },
.descr = "2^32 - 1 -> 2^32 (word carry)",
},
{
.input = { UINT32_MAX, UINT32_MAX, 0, 0 },
.expected = { 0, 0, 1, 0 },
.descr = "2^64 - 1 -> 2^64 (u128t_word0 carry)",
},
{
.input = { UINT32_MAX, UINT32_MAX, UINT32_MAX, 0 },
.expected = { 0, 0, 0, 1 },
.descr = "2^96 - 1 -> 2^96 (word carry)",
},
};
uint8_t inputle[16], expectedle[16];
uint128_t a;
size_t i;
for (i = 0; i < nitems(tests); i++) {
vec_u32_tole128(inputle, tests[i].input);
vec_u32_tole128(expectedle, tests[i].expected);
a = le128dec(inputle);
uint128_increment(&a);
u128_check_equality(le128dec(expectedle), a, tests[i].descr);
}
}
ATF_TC_WITHOUT_HEAD(uint128_add64);
ATF_TC_BODY(uint128_add64, tc)
{
static const struct u128_add64_tc {
uint32_t input[4];
uint64_t addend;
uint32_t expected[4];
const char *descr;
} tests[] = {
{
.input = { 0, 0, 0, 0 },
.addend = 1,
.expected = { 1, 0, 0, 0 },
.descr = "0 + 1 -> 1",
},
{
.input = { 1, 0, 0, 0 },
.addend = UINT32_MAX,
.expected = { 0, 1, 0, 0 },
.descr = "1 + (2^32 - 1) -> 2^32 (word carry)",
},
{
.input = { 1, 0, 0, 0 },
.addend = UINT64_MAX,
.expected = { 0, 0, 1, 0 },
.descr = "1 + (2^64 - 1) -> 2^64 (u128t_word0 carry)",
},
{
.input = { 0x11111111, 0x11111111, 0, 0 },
.addend = 0xf0123456789abcdeULL,
.expected = { 0x89abcdef, 0x01234567, 1, 0 },
.descr = "0x1111_1111_1111_1111 +"
"0xf012_3456_789a_bcde ->"
"0x1_0123_4567_89ab_cdef",
},
{
.input = { 1, 0, UINT32_MAX, 0 },
.addend = UINT64_MAX,
.expected = { 0, 0, 0, 1 },
.descr = "Carry ~2^96",
},
};
uint8_t inputle[16], expectedle[16];
uint128_t a;
size_t i;
for (i = 0; i < nitems(tests); i++) {
vec_u32_tole128(inputle, tests[i].input);
vec_u32_tole128(expectedle, tests[i].expected);
a = le128dec(inputle);
uint128_add(&a, tests[i].addend);
u128_check_equality(le128dec(expectedle), a, tests[i].descr);
}
}
/*
* Test assumptions about Chacha incrementing counter in the same way as
* uint128.h
*/
ATF_TC_WITHOUT_HEAD(uint128_chacha_ctr);
ATF_TC_BODY(uint128_chacha_ctr, tc)
{
static const struct u128_add64_tc {
uint32_t input[4];
uint32_t expected[4];
const char *descr;
} tests[] = {
{
.input = { 0, 0, 0, 0 },
.expected = { 1, 0, 0, 0 },
.descr = "Single block",
},
{
.input = { 1, 0, 0, 0 },
.expected = { 2, 0, 0, 0 },
.descr = "0 -> 2",
},
{
.input = { 0xff, 0, 0, 0 },
.expected = { 0x100, 0, 0, 0 },
.descr = "0xff -> 0x100 (byte carry)",
},
{
.input = { UINT32_MAX, 0, 0, 0 },
.expected = { 0, 1, 0, 0 },
.descr = "2^32 - 1 -> 2^32 (word carry)",
},
{
.input = { UINT32_MAX, UINT32_MAX, 0, 0 },
.expected = { 0, 0, 1, 0 },
.descr = "2^64 - 1 -> 2^64 (u128t_word0 carry)",
},
{
.input = { UINT32_MAX, UINT32_MAX, UINT32_MAX, 0 },
.expected = { 0, 0, 0, 1 },
.descr = "2^96 - 1 -> 2^96 (word carry)",
},
};
union randomdev_key context;
uint8_t inputle[16], expectedle[16], trash[CHACHA_BLOCKLEN];
uint8_t notrandomkey[RANDOM_KEYSIZE] = { 0 };
uint128_t a;
size_t i;
random_chachamode = true;
randomdev_encrypt_init(&context, notrandomkey);
for (i = 0; i < nitems(tests); i++) {
vec_u32_tole128(inputle, tests[i].input);
vec_u32_tole128(expectedle, tests[i].expected);
a = le128dec(inputle);
randomdev_keystream(&context, &a, trash, sizeof(trash));
u128_check_equality(le128dec(expectedle), a, tests[i].descr);
}
}
ATF_TP_ADD_TCS(tp)
{
ATF_TP_ADD_TC(tp, uint128_inc);
ATF_TP_ADD_TC(tp, uint128_add64);
ATF_TP_ADD_TC(tp, uint128_chacha_ctr);
return (atf_no_error());
}