// SPDX-License-Identifier: MIT
/*
* Test libfsverity_compute_digest().
*
* Copyright 2020 Google LLC
*
* Use of this source code is governed by an MIT-style
* license that can be found in the LICENSE file or at
* https://opensource.org/licenses/MIT.
*/
#include "utils.h"
#include <ctype.h>
#include <inttypes.h>
struct mem_file {
u8 *data;
size_t size;
size_t offset;
};
static int read_fn(void *fd, void *buf, size_t count)
{
struct mem_file *f = fd;
ASSERT(count <= f->size - f->offset);
memcpy(buf, &f->data[f->offset], count);
f->offset += count;
return 0;
}
static int error_read_fn(void *fd __attribute__((unused)),
void *buf __attribute__((unused)),
size_t count __attribute__((unused)))
{
return -EIO;
}
static const struct test_case {
u32 hash_algorithm;
u32 block_size;
const char *salt;
u64 file_size;
const char *digest;
} test_cases[] = {
{ /* large file */
.hash_algorithm = FS_VERITY_HASH_ALG_SHA256,
.file_size = 1000000,
.block_size = 4096,
.digest = "\x48\xdf\x0c\x46\x23\x29\xcd\x87"
"\x96\x61\xbd\x05\xb3\x9a\xa8\x1b"
"\x05\xcc\x16\xaf\xd2\x7a\x71\x96"
"\xa5\x59\xda\x83\x53\x1d\x39\xd9",
}, { /* small file */
.hash_algorithm = FS_VERITY_HASH_ALG_SHA256,
.file_size = 100000,
.block_size = 4096,
.digest = "\xf2\x09\x6a\x36\xc5\xcd\xca\x4f"
"\xa3\x3e\xe8\x85\x28\x33\x15\x0b"
"\xb3\x24\x99\x2e\x54\x17\xa9\xd5"
"\x71\xf1\xbf\xff\xf7\x3b\x9e\xfc",
}, { /* single-block file */
.hash_algorithm = FS_VERITY_HASH_ALG_SHA256,
.file_size = 4096,
.block_size = 4096,
.digest = "\x6a\xc3\x99\x79\x01\x6e\x3d\xdf"
"\x3d\x39\xff\xf6\xcb\x98\x4f\x7c"
"\x11\x8a\xcd\xf1\x85\x29\x19\xf5"
"\xc1\x00\xc4\xb1\x42\xc1\x81\x8e",
}, { /* tiny file */
.hash_algorithm = FS_VERITY_HASH_ALG_SHA256,
.file_size = 1,
.block_size = 4096,
.digest = "\xb8\x03\x42\x95\x03\xd9\x59\x15"
"\x82\x9b\x29\xfd\xbc\x8b\xba\xd1"
"\x42\xf3\xab\xfd\x11\xb1\xca\xdf"
"\x55\x26\x58\x2e\x68\x5c\x05\x51",
}, { /* empty file */
.hash_algorithm = FS_VERITY_HASH_ALG_SHA256,
.file_size = 0,
.block_size = 4096,
.digest = "\x3d\x24\x8c\xa5\x42\xa2\x4f\xc6"
"\x2d\x1c\x43\xb9\x16\xea\xe5\x01"
"\x68\x78\xe2\x53\x3c\x88\x23\x84"
"\x80\xb2\x61\x28\xa1\xf1\xaf\x95",
}, { /* salt */
.hash_algorithm = FS_VERITY_HASH_ALG_SHA256,
.file_size = 1000000,
.block_size = 4096,
.salt = "abcd",
.digest = "\x91\x79\x00\xb0\xd2\x99\x45\x4a"
"\xa3\x04\xd5\xde\xbc\x6f\x39\xe4"
"\xaf\x7b\x5a\xbe\x33\xbd\xbc\x56"
"\x8d\x5d\x8f\x1e\x5c\x4d\x86\x52",
}, { /* max length salt (32 bytes) */
.hash_algorithm = FS_VERITY_HASH_ALG_SHA256,
.file_size = 1000000,
.block_size = 4096,
.salt = "0123456789:;<=>?@ABCDEFGHIJKLMNO",
.digest = "\xbc\x2d\x70\x32\x4c\x04\x8c\x22"
"\x0a\x2c\xb1\x90\x83\x21\x40\x86"
"\x3e\xb2\x68\xe6\x80\x42\x79\x39"
"\xe5\xd4\x67\xbe\xa5\xec\x5a\xd9",
}, { /* 1K block size */
.hash_algorithm = FS_VERITY_HASH_ALG_SHA256,
.file_size = 1000000,
.block_size = 1024,
.digest = "\xe9\xdf\x92\x7c\x14\xfc\xb9\x61"
"\xd5\xf5\x1c\x66\x6d\x8a\xe4\xc1"
"\x4f\xe4\xff\x98\xa3\x74\xc7\x33"
"\xe8\x98\xd0\x0c\x9e\x74\xa8\xe3",
}, { /* 512-byte block size */
.hash_algorithm = FS_VERITY_HASH_ALG_SHA256,
.file_size = 1000000,
.block_size = 512,
.digest = "\x03\x93\xee\x3d\xfd\x4a\x28\x96"
"\x6e\x2a\xf4\xe0\x7c\xfa\x5b\x03"
"\x2c\x30\xda\x5b\xb8\xe8\xef\x63"
"\xb9\xa5\x5b\xf9\x63\x26\x23\x34",
}, { /* 64K block size */
.hash_algorithm = FS_VERITY_HASH_ALG_SHA256,
.file_size = 1000000,
.block_size = 65536,
.digest = "\xf3\xb6\x41\x8f\x26\xd4\xd0\xe7"
"\x47\x28\x19\x3b\xae\x76\xf1\x5c"
"\xb4\xbb\x2c\xe9\x77\x74\x48\xd7"
"\x6b\xd8\x13\x8b\x69\xec\x61\xc2",
}, { /* SHA-512 */
.hash_algorithm = FS_VERITY_HASH_ALG_SHA512,
.file_size = 1000000,
.block_size = 4096,
.salt = "abcd",
.digest = "\x84\x25\xc6\xd0\xc9\x4f\x84\xed"
"\x90\x4c\x12\x93\x68\x45\xfb\xb7"
"\xaf\x99\x53\x75\x37\x89\x71\x2d"
"\xcc\x3b\xe1\x42\xdb\x3d\x4b\x6b"
"\x47\xa3\x99\xad\x52\xaa\x60\x92"
"\x56\xce\x29\xa9\x60\xbf\x4b\xb0"
"\xe5\x95\xec\x38\x6c\xa5\x8c\x06"
"\x51\x9d\x54\x6d\xc5\xb1\x97\xbb",
}, { /* default hash algorithm (SHA-256) and block size (4096) */
.file_size = 100000,
.digest = "\xf2\x09\x6a\x36\xc5\xcd\xca\x4f"
"\xa3\x3e\xe8\x85\x28\x33\x15\x0b"
"\xb3\x24\x99\x2e\x54\x17\xa9\xd5"
"\x71\xf1\xbf\xff\xf7\x3b\x9e\xfc",
},
};
static void fix_digest_and_print(const struct test_case *t,
const struct libfsverity_digest *d)
{
char alg_name[32] = {};
size_t i;
strncpy(alg_name, libfsverity_get_hash_name(t->hash_algorithm),
sizeof(alg_name) - 1);
for (i = 0; i < sizeof(alg_name) - 1; i++)
alg_name[i] = toupper((u8)alg_name[i]);
printf("\t}, {\n"
"\t\t.hash_algorithm = FS_VERITY_HASH_ALG_%s,\n"
"\t\t.file_size = %" PRIu64 ",\n"
"\t\t.block_size = %u,\n",
alg_name, t->file_size, t->block_size);
if (t->salt != NULL)
printf("\t\t.salt = \"%s\",\n", t->salt);
for (i = 0; i < d->digest_size; i++) {
if (i == 0)
printf("\t\t.digest = \"");
else if (i % 8 == 0)
printf("\t\t\t \"");
printf("\\x%02x", d->digest[i]);
if (i + 1 == d->digest_size)
printf("\",\n");
else if (i % 8 == 7)
printf("\"\n");
}
}
static void test_invalid_params(void)
{
struct mem_file f = { .data = (u8 *)"abcd", .size = 4 };
struct libfsverity_merkle_tree_params good_params = {
.version = 1,
.hash_algorithm = FS_VERITY_HASH_ALG_SHA256,
.file_size = 4,
.block_size = 4096,
};
struct libfsverity_merkle_tree_params params;
struct libfsverity_digest *d = NULL;
libfsverity_set_error_callback(NULL);
ASSERT(libfsverity_compute_digest(&f, read_fn, &good_params, &d) == 0);
f.offset = 0;
free(d);
d = NULL;
/* missing required arguments */
ASSERT(libfsverity_compute_digest(&f, NULL, &good_params, &d) == -EINVAL);
ASSERT(libfsverity_compute_digest(&f, read_fn, NULL, &d) == -EINVAL);
ASSERT(libfsverity_compute_digest(&f, read_fn, &good_params, NULL) == -EINVAL);
/* bad version */
params = good_params;
params.version = 0;
ASSERT(libfsverity_compute_digest(&f, read_fn, ¶ms, &d) == -EINVAL);
params.version = 1000;
ASSERT(libfsverity_compute_digest(&f, read_fn, ¶ms, &d) == -EINVAL);
/* bad hash_algorithm */
params = good_params;
params.hash_algorithm = 1000;
ASSERT(libfsverity_compute_digest(&f, read_fn, ¶ms, &d) == -EINVAL);
/* bad block_size */
params = good_params;
params.block_size = 1;
ASSERT(libfsverity_compute_digest(&f, read_fn, ¶ms, &d) == -EINVAL);
params.block_size = 4097;
ASSERT(libfsverity_compute_digest(&f, read_fn, ¶ms, &d) == -EINVAL);
/* bad salt_size */
params = good_params;
params.salt_size = 1000;
ASSERT(libfsverity_compute_digest(&f, read_fn, ¶ms, &d) == -EINVAL);
params.salt = (u8 *)"";
ASSERT(libfsverity_compute_digest(&f, read_fn, ¶ms, &d) == -EINVAL);
/* bad reserved fields */
params = good_params;
params.reserved1[0] = 1;
ASSERT(libfsverity_compute_digest(&f, read_fn, ¶ms, &d) == -EINVAL);
params = good_params;
params.reserved1[ARRAY_SIZE(params.reserved1) - 1] = 1;
ASSERT(libfsverity_compute_digest(&f, read_fn, ¶ms, &d) == -EINVAL);
params = good_params;
params.reserved2[0] = 1;
ASSERT(libfsverity_compute_digest(&f, read_fn, ¶ms, &d) == -EINVAL);
params = good_params;
params.reserved2[ARRAY_SIZE(params.reserved2) - 1] = 1;
ASSERT(libfsverity_compute_digest(&f, read_fn, ¶ms, &d) == -EINVAL);
/* error reading file */
ASSERT(libfsverity_compute_digest(&f, error_read_fn, &good_params, &d) == -EIO);
ASSERT(d == NULL);
}
int main(int argc, char *argv[])
{
const bool update = (argc == 2 && !strcmp(argv[1], "--update"));
size_t i;
struct mem_file f = {};
struct libfsverity_merkle_tree_params params;
struct libfsverity_digest *d;
int err;
install_libfsverity_error_handler();
for (i = 0; i < ARRAY_SIZE(test_cases); i++)
f.size = max(f.size, test_cases[i].file_size);
f.data = xmalloc(f.size);
for (i = 0; i < f.size; i++)
f.data[i] = (i % 11) + (i % 439) + (i % 1103);
for (i = 0; i < ARRAY_SIZE(test_cases); i++) {
u32 expected_alg = test_cases[i].hash_algorithm ?:
FS_VERITY_HASH_ALG_SHA256;
memset(¶ms, 0, sizeof(params));
params.version = 1;
params.hash_algorithm = test_cases[i].hash_algorithm;
params.file_size = test_cases[i].file_size;
params.block_size = test_cases[i].block_size;
if (test_cases[i].salt) {
params.salt = (const u8 *)test_cases[i].salt;
params.salt_size = strlen(test_cases[i].salt);
}
f.size = test_cases[i].file_size;
f.offset = 0;
err = libfsverity_compute_digest(&f, read_fn, ¶ms, &d);
ASSERT(err == 0);
ASSERT(d->digest_algorithm == expected_alg);
ASSERT(d->digest_size ==
libfsverity_get_digest_size(expected_alg));
if (update)
fix_digest_and_print(&test_cases[i], d);
else
ASSERT(!memcmp(d->digest, test_cases[i].digest,
d->digest_size));
free(d);
d = NULL;
}
free(f.data);
if (update) {
printf("\t}\n");
return 1;
}
test_invalid_params();
printf("test_compute_digest passed\n");
return 0;
}