Commit Graph

534 Commits

Author SHA1 Message Date
Ian Benz
5c5433a8d8 Update OEMCrypto_LoadLicense corpus for ODK_Packing_ParsedLicense
- Regenerate corpus files.
- Change nonce endianness.

Merged from https://widevine-internal-review.googlesource.com/177010

Change-Id: I5f288a054325097d6ea696cd755fc0557d0eadd1
2024-01-26 16:20:39 -08:00
Vicky Min
28e68a866b Fix crash in wvoec::LicenseRoundTrip::InjectFuzzedResponseData
After the ODK_MAX_NUM_KEYS change, the core response is a pointer to an
array instead of an array. This check should ensure the index of the key
array can always be accessed.

Bug: 286531859
Change-Id: I44604eb977be722ef692de2b61e1f626266a42a7
2024-01-26 16:18:40 -08:00
Ian Benz
ed55c511a3 Add OEMCrypto_GenerateCertificateKeyPair second stage fuzzer
Merged from https://widevine-internal-review.googlesource.com/176771

Change-Id: I8afee6636a44f46a573be5a94f6c12161b57eace
2024-01-26 15:27:29 -08:00
Ian Benz
4aa2bcde49 Fix OEMCrypto_LoadEntitledContentKeys fuzzer
- Pass entitled key session to OEMCrypto_LoadEntitledContentKeys.
- Refresh corpus files.

Merged from https://widevine-internal-review.googlesource.com/176750
Merged from https://widevine-internal-review.googlesource.com/176758

Change-Id: I7edb081933d37897e3b9d83dd00a627b5de64bc9
2024-01-26 15:26:46 -08:00
Ian Benz
3a05989920 Add OEMCrypto_GetDeviceSignedCsrPayload fuzzer
Merged from https://widevine-internal-review.googlesource.com/175050

Change-Id: I28e4b1bc1f82deaf5644d0b2e31d916bf65365d3
2024-01-26 15:23:50 -08:00
Ian Benz
ea43147a08 Add OEMCrypto_GetDeviceInformation fuzzer
Merged from https://widevine-internal-review.googlesource.com/174936

Change-Id: I79bbb8506a13d3142a8b323a7c67d0155973a3f4
2024-01-26 15:22:49 -08:00
Ian Benz
4f29280b3e Remove unused OEMCrypto_GenerateSignature fuzzer
Merged from https://widevine-internal-review.googlesource.com/174772
Merged from https://widevine-internal-review.googlesource.com/176633
Merged from https://widevine-internal-review.googlesource.com/176634
Merged from https://widevine-internal-review.googlesource.com/176670

Change-Id: I36438c102bfe68ff16eab3db301377e858f533c1
2024-01-26 15:21:21 -08:00
Ian Benz
09e6f1c60f Add OEMCrypto_GetKeyHandle fuzzer
Merged from https://widevine-internal-review.googlesource.com/174934

Change-Id: If44423ed51cc2ff10c1b471d39db962a653d8c14
2024-01-26 15:18:06 -08:00
Ian Benz
31a2f09792 Enable OEMCrypto_MoveEntry/ReuseUsageEntry fuzzers
Merged from https://widevine-internal-review.googlesource.com/174893

Change-Id: Ia46e74450bc20302edaf1c5e2bbde957a1d31c95
2024-01-26 15:17:45 -08:00
Ian Benz
8a4160bf8a Add OEMCrypto_GetRandom fuzzer
Merged from https://widevine-internal-review.googlesource.com/174771
Merged from https://widevine-internal-review.googlesource.com/174854

Change-Id: Ia654123bcbe8fa2e7daadaab79c1149ff3cde6b0
2024-01-26 15:17:36 -08:00
Ian Benz
76cf1cd985 Simplify and enable create and remove entitled key session fuzzer
Merged from https://widevine-internal-review.googlesource.com/174851

Change-Id: Iebddae2412c66dbaf5bac042518aea58f9b0c315
2024-01-26 15:17:12 -08:00
Ian Benz
708670c98b Simplify OEMCrypto_InstallOemPrivateKey fuzzer
Merged from https://widevine-internal-review.googlesource.com/174890
Merged from https://widevine-internal-review.googlesource.com/174856

Change-Id: If863e4a8f739ca5645311d7f7b08e6aec4cc7aca
2024-01-26 15:16:55 -08:00
Ian Benz
75d4778531 Fix spelling mistake
Merged from https://widevine-internal-review.googlesource.com/172590
Merged from https://widevine-internal-review.googlesource.com/172610
Merged from https://widevine-internal-review.googlesource.com/172650
Merged from https://widevine-internal-review.googlesource.com/174011

Change-Id: I88cb66704509010fa2e0bee5d0f580173db6fdcd
2024-01-26 15:16:55 -08:00
Ian Benz
a66143bec4 Fix OEMCrypto_GenerateRSASignature fuzzer
Ensure OEMCrypto is in the correct state before invoking
OEMCrypto_GenerateRSASignature.

Merged from https://widevine-internal-review.googlesource.com/168857
Merged from https://widevine-internal-review.googlesource.com/172171
Merged from https://widevine-internal-review.googlesource.com/172410
Merged from https://widevine-internal-review.googlesource.com/173130

Change-Id: I774f59af8044939c5a9618de348f2120a834e043
2024-01-26 15:16:55 -08:00
Ian Benz
57b391c8b9 Fix bugs impacting fuzzing coverage
- Update ConvertDataToValidEnum to not use FuzzedDataProvider since it
  causes unexpected parsing results.
- Add OEMCryptoLicenseAPIFuzz::LoadLicenseWithGenericCryptoKeys so that
  generic crypto fuzz tests can load appropriate keys.
- Remove custom mutator from oemcrypto_generic_verify_fuzz because it
  provides minimal additional coverage.
- Refresh affected corpus files.

Merged from https://widevine-internal-review.googlesource.com/168557
Merged from https://widevine-internal-review.googlesource.com/171191
Merged from https://widevine-internal-review.googlesource.com/172170
Merged from https://widevine-internal-review.googlesource.com/172250

Change-Id: Ie676a36cbf4c12bdda9566fad3590a7b69168d9c
2024-01-26 15:15:36 -08:00
Ian Benz
55ef762c08 Improve fuzzers with FuzzedDataProvider inputs
- Remove redundant input size checks handled by FuzzedDataProvider.
- Allow passing null when buffer size is used as an in/out parameter.

Merged from https://widevine-internal-review.googlesource.com/168637
Merged from https://widevine-internal-review.googlesource.com/171190
Merged from https://widevine-internal-review.googlesource.com/172090
Merged from https://widevine-internal-review.googlesource.com/172251

Change-Id: Ib5779ab969f646f306088b3d75d513e1f07a3886
2024-01-26 13:40:22 -08:00
Ian Benz
53fe55cb72 Clean up fuzz helper classes
- Remove OEMCrypto state changes hidden in constructors and destructors.
- Use composition instead of inheritance to structure classes.
- Avoid calling non-trivial destructors for objects with static
  lifetime.

Merged from https://widevine-internal-review.googlesource.com/168497
Merged from https://widevine-internal-review.googlesource.com/171170
Merged from https://widevine-internal-review.googlesource.com/171171
Merged from https://widevine-internal-review.googlesource.com/171870

Change-Id: I20476a7b1132d11f011b8650ec01e3c2dc3fc0e8
2024-01-26 13:40:22 -08:00
Ian Benz
af070601b0 Add OEMCrypto_SetDecryptHash/GetHashErrorCode fuzzer
Merged from https://widevine-internal-review.googlesource.com/169021
Merged from https://widevine-internal-review.googlesource.com/170030

Change-Id: I209d280b0478620197fc514966af3c93fc2272aa
2024-01-26 13:40:20 -08:00
Ian Benz
7b592f1990 Add OEMCrypto_GenerateCertificateKeyPair fuzzer
Merged from https://widevine-internal-review.googlesource.com/168817
Merged from https://widevine-internal-review.googlesource.com/169915

Change-Id: If4d3f4cd2b028765072a14c74781e9750dc3e38b
2024-01-26 13:39:28 -08:00
Ian Benz
c0c349cd28 Fix OEMCrypto_LoadUsageEntry fuzzer
- Ensure OEMCrypto is in the correct state before invoking
  OEMCrypto_LoadUsageEntry.
- Do not use FuzzedDataProvider to parse usage_entry_number since it
  causes unexpected parsing results.

Merged from https://widevine-internal-review.googlesource.com/168859
Merged from https://widevine-internal-review.googlesource.com/169293
Merged from https://widevine-internal-review.googlesource.com/169970
Merged from https://widevine-internal-review.googlesource.com/170011

Change-Id: I6c3ddfe457facef9c9d0fc524fc3cf76aba90f64
2024-01-26 13:36:26 -08:00
Ian Benz
fb1f3af60f Add OEMCrypto_GetBootCertificateChain fuzzer
Merged from https://widevine-internal-review.googlesource.com/168818
Merged from https://widevine-internal-review.googlesource.com/169890

Change-Id: I2530555a1cf94726c82511504e480b843b244c7b
2024-01-26 13:36:21 -08:00
Ian Benz
8a9b3c5c75 Fix OEMCrypto_LoadEntitledContentKeys fuzzer
- Create an entitled key session for OEMCrypto v17 and later.
- Refresh corpus files.

Merged from https://widevine-internal-review.googlesource.com/168897
Merged from https://widevine-internal-review.googlesource.com/169292

Change-Id: Ied9fce445a837e417077381de71d2834f385f120
2024-01-26 12:19:08 -08:00
Kyle Zhang
6b60fc3a76 Add property to check if user forces L3
[ Merge of go/wvgerrit/186611 ]

Android user can set the property using the developer option.

Bug: 301669353
Change-Id: I730b635f6cc28dfb0471c1d679627c94b9e16af1
2023-11-09 19:59:46 +00:00
Vicky Min
6d494fa76c Filter RSA 3072 tests
Merge from Widevine repo of http://go/wvgerrit/169089

We want to transition to using GTEST_SKIP to skip unit tests instead of
modifying the GTEST_FILTER variable. This does so for tests that require
RSA 3072 support. Note: I think part of this CL got lost in
go/wvgerrit/167740, so this is adding the rest in.

Bug: 251240681
Merged from https://widevine-internal-review.googlesource.com/168237

Change-Id: I3002f705f7e3f4b38d0e5efef355e5c3f3529218
2023-03-28 20:30:22 +00:00
Vicky Min
0972c59fc0 Filter CAS tests
Merge from Widevine repo of http://go/wvgerrit/169080

We want to transition to using GTEST_SKIP to skip unit tests instead of
modifying the GTEST_FILTER variable. This does so for tests that require
CAS support.

Bug: 251240681
Merged from https://widevine-internal-review.googlesource.com/167739

Change-Id: Ifb971bf01e2c21fe672bbe4bfa15c797456256ef
2023-03-28 20:30:22 +00:00
Vicky Min
f83698a164 Refactor missed provisioning and renewal tests
Merge from Widevine repo of http://go/wvgerrit/169079

Bug: 253779846
Merged from https://widevine-internal-review.googlesource.com/167738

Change-Id: If8fc484f02fc1544977f1fb3a5fe1fa42d7367d7
2023-03-28 20:30:22 +00:00
Vicky Min
225a3e50ed Use GTEST_SKIP to skip prov40 tests
Merge from Widevine repo of http://go/wvgerrit/169076

We want to transition to using GTEST_SKIP to skip unit tests instead of
modifying the GTEST_FILTER variable. This does so for provisioning 4.0
tests.

Bug: 251240681
Merged from https://widevine-internal-review.googlesource.com/167497

Change-Id: I65a879fba24b199bd115980bdd556c123fcc1cdc
2023-03-28 20:30:22 +00:00
Fred Gylys-Colwell
2f45350921 Update oemcrypto unit tests version number
Merge from Widevine repo of http://go/wvgerrit/169074

And update a few scripts that check for version number.

Merged from https://widevine-internal-review.googlesource.com/167657

Bug: 275264353
Test: luci tests
Change-Id: Ic3c16323e993075c9bfe206fc73bf82c0e67f65b
2023-03-28 20:30:22 +00:00
Fred Gylys-Colwell
d7ee89bab0 Filter Cast Reciver tests
Merge from Widevine repo of http://go/wvgerrit/169070

This turns on the cast receiver tests for any device that
claims to support this feature. Previously, we had to
explicitly request these tests on the command line.

But since they do not pass for Prov 4.0, we fitler them out
in this case and reference a bug tracking that work.

We also switch to using GTEST_SKIP to skip the tests instead
of modifying the GTEST_FILTER.

Bug: 251240681
Bug: 269310676
Bug: 259455058
Bug: 259454969
Merged from https://widevine-internal-review.googlesource.com/166497

Change-Id: I1bcd749243a474b3f638547aa43c2805e86731af
2023-03-28 20:30:22 +00:00
Vicky Min
64521717d8 Use GTEST_SKIP to skip prov 3.0 tests
Merge from Widevine repo of http://go/wvgerrit/169068

We want to transition to using GTEST_SKIP to skip unit tests instead of
modifying the GTEST_FILTER variable. This does so for provisioning 3.0
tests.

Bug: 251240681
Merged from https://widevine-internal-review.googlesource.com/167498

Change-Id: I997e1051f3bd7925bc69cf1b269a5bbbae8031b7
2023-03-28 20:30:22 +00:00
Vicky Min
54e6b3d45d Small changes to refactored unit tests
Merge from Widevine repo of http://go/wvgerrit/169064

This CL should cleanup some minor issues that existed after the initial
CLs refactoring the unit tests went in. The issues fixed should be:
1) duplicate decrypt tests
2) decrypt tests added to be run
3) removed unecessary header files
4) refactored some provisioning tests that I had previously overlooked

Bug: 253779846
Merged from https://widevine-internal-review.googlesource.com/167537

Change-Id: Ic474fbcf69a08c0482b5e74d0c80be2cd16702d8
2023-03-28 20:30:22 +00:00
Vicky Min
26aa378ca5 Refactor usage table tests
Merge from Widevine repo of http://go/wvgerrit/169061

Bug: 253779846
Merged from https://widevine-internal-review.googlesource.com/167477

Change-Id: I6046e59449700c8be05641f71dcbb2bba6ce493b
2023-03-28 20:30:22 +00:00
Vicky Min
6897bc1a1c Refactor decrypt unit tests
Merge from Widevine repo of http://go/wvgerrit/169052

Refactor the decrypt unit tests into a separate file.

Bug: 253779846
Merged from https://widevine-internal-review.googlesource.com/167180

Change-Id: I10a4a987b0d597f0c6d2953c0723bea4d790fb9c
2023-03-28 20:30:22 +00:00
Matt Feddersen
dbd5bd2a4d Update OPK v18 documentation
Merge from Widevine repo of http://go/wvgerrit/169050

- Update changelog
- Update copy parter files script to include linux port
- Update opk_partner_test script (used to make sure everything works out
  of the box) with third party dependencies, refactored downloads into
  a public setup.sh script
- Remove WTPI_BUILD_INFO from OPK makefiles and gyp files, since it is
  no longer needed
- Remove FILES.md since it is out of date and ree-sources.mk and
  tee-sources.mk satisfy the same purpose
- Add debug flag in comments for OP-TEE and Linux ports. As a hint for
  how to enable debug in OPK
- Remove oemcrypto_build_info.h since it is no longer needed. Move the
  XSTR macro it contained to oemcrypto_api_macros.h
- Add provisioning method macro to OPTEE and Linux build files to hint
  at how to build Prov 2 and Prov 4 using the same build files but
  different build-time values.

Merged from https://widevine-internal-review.googlesource.com/166219

Bug: 275264353
Test: luci tests
Change-Id: I220e3296f631d895a7c4504454635fe396efc0a4
2023-03-28 20:28:57 +00:00
Ian Benz
c579a79462 Fix null passed to memcpy in generic verify fuzz
Merge from Widevine repo of http://go/wvgerrit/169048

Do not generate a new signature during mutation if a key handle cannot
be retrieved by OEMCrypto_GetKeyHandle().

Bug: 275264353
Test: luci tests
Change-Id: I9a804328c4b6d3e50d14c3f9c71043e71a88e3da
2023-03-28 20:28:57 +00:00
Fred Gylys-Colwell
e51bb19296 Refresh corpus for oemcrypto fuzz tests with modified format
Merge from Widevine repo of http://go/wvgerrit/165958
and  http://go/wvgerrit/165862

Bug: 275264353
Test: test only code

Change-Id: I30829ad72d58e2233f4cc9963d17cb07314b7720
2023-03-28 20:28:57 +00:00
Cong Lin
e8add8eed8 Sync oemcrypto files from cdm udc-dev to Android
Changes included in this CL:

166806: Update OEMCrypto_GetDeviceInformation() | https://widevine-internal-review.googlesource.com/c/cdm/+/166806
166808: Update Android L3 after OEMCrypto_GetDeviceInformation() signature changes | https://widevine-internal-review.googlesource.com/c/cdm/+/166808
166809: Decode device info and write it to CSR payload | https://widevine-internal-review.googlesource.com/c/cdm/+/166809
167158: Fix Android include path and copy_files | https://widevine-internal-review.googlesource.com/c/cdm/+/167158
167159: Fix common typos and use inclusive language suggested by Android linter | https://widevine-internal-review.googlesource.com/c/cdm/+/167159

165618: Explicitly state python3 where needed. | https://widevine-internal-review.googlesource.com/c/cdm/+/165618

166757: Update Android.bp for Android | https://widevine-internal-review.googlesource.com/c/cdm/+/166757
164993: Refactor basic oemcrypto unit tests | https://widevine-internal-review.googlesource.com/c/cdm/+/164993
164978: Update OEMCrypto Unit Test Docs | https://widevine-internal-review.googlesource.com/c/cdm/+/164978
166941: Update make files for OEMCrypto | https://widevine-internal-review.googlesource.com/c/cdm/+/166941

165279: Refactor license unit tests | https://widevine-internal-review.googlesource.com/c/cdm/+/165279
165318: Refactor provisioning unit tests | https://widevine-internal-review.googlesource.com/c/cdm/+/165318
164800: Add extra check for renew on license load unit test | https://widevine-internal-review.googlesource.com/c/cdm/+/164800
165860: Remove duplicate definition of MaybeHex() | https://widevine-internal-review.googlesource.com/c/cdm/+/165860

164889: Updated CoreCommonRequestFromMessage and fix test | https://widevine-internal-review.googlesource.com/c/cdm/+/164889
164967: Add OPK pre-hook and post-hook error codes | https://widevine-internal-review.googlesource.com/c/cdm/+/164967
165140: Add hidden device_id_length to v18 provisioning message | https://widevine-internal-review.googlesource.com/c/cdm/+/165140
165204: Fix memory leak in oemcrypto test | https://widevine-internal-review.googlesource.com/c/cdm/+/165204

165958: Fix oemcrypto_generic_verify_fuzz mutator signature offset | https://widevine-internal-review.googlesource.com/c/cdm/+/165958

166037: Support SHA-256 in OEMCrypto Session Util | https://widevine-internal-review.googlesource.com/c/cdm/+/166037

Test: Run GtsMediaTests on Pixel 7
Bug: 270612144

Change-Id: Iff0820a2de7d043a820470a130af65b0dcadb759
2023-02-28 11:21:05 -08:00
Bob Badour
080bfc7414 Merge "Cleanup vendor projects are proprietary." into tm-qpr-dev-plus-aosp am: cbb6177df2
Original change: https://googleplex-android-review.googlesource.com/c/platform/vendor/widevine/+/21276850

Change-Id: I7ba871f7714ba4eb5dcb5b0571b6024533a25217
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
2023-02-05 03:54:39 +00:00
Bob Badour
6f047790e0 Cleanup vendor projects are proprietary.
Test: m droid dist
Change-Id: I0bdec38c4d12710fa97b91665d211ba6c0d4b24d
2023-02-03 14:37:11 -08:00
Cong Lin
7474b41fd0 Temporarily remove json dependency in oemcrypto v18 unit test
Disable one oemcrypto v18 unit test which takes nlohmann-json dependency
for now, until the json dependency is fixed.

Test: build widevine and oemcrypto unit tests
Bug: 263397641
Change-Id: I065b28a81cc481b2b64bda27733640e0fdea0c2c
2022-12-21 13:23:21 -08:00
Kyle Zhang
11255b7426 Pick widevine oemcrypto-v18 change
No-Typo-Check: From a third party header file
Bug: 260918793
Test: unit tests
Test: atp v2/widevine-eng/drm_compliance
Change-Id: I36effd6a10a99bdb2399ab1f4a0fad026d607c70
2022-12-21 00:03:50 +00:00
Edwin Wong
6d3457b9d9 Remove hidl support.
Merged from http://go/wvgerrit/161857

Test: streaming(Netflix, Play Movies & TV)
Test: ./build_and_run_all_unit_tests.sh
Test: adb shell ps | grep drm
Test: metrics_dump
Test: hardware/interfaces/drm/aidl/vts$ atest VtsAidlHalDrmTargetTest

Bug: 259299992
Change-Id: I76bcc82bbfb3fc60987b66265a580946a16c341d
2022-11-22 19:03:30 +00:00
Kyle Zhang
af0168dbed Merge cdm changes to android repo
Bug: 251924225
Test: GtsMediaTestCases
Change-Id: I1b4e64c0abf701fe1f5017f14dc72b72c3ea6770
2022-10-11 00:40:42 +00:00
Alex Dale
e3697c6595 Fix oemcrypto_decrypt_cenc_fuzz null reference
[ Merge of http://go/wvgerrit/153669 ]

The oemcrypto_decrypt_cenc_fuzz fuzz test found a null reference error.
This adds a check to ensure that the input_buffer vector used for the
sample descriptions is not empty before attempting to access it.

Bug: 192310854
Bug: 236317198
Change-Id: If3909b01d3bc19434bbd5b6b77e7cd76182b2bdf
2022-08-19 14:38:33 -07:00
Alex Dale
cc29f745f9 Re-enabled OEMCrypto fuzz tests
[ Merge of http://go/wvgerrit/153121 ]

`run_oemcrypto_fuzz_tests` script was disabled while OPK was
transitioning between v16 and v17.  Now that OPK is v17, the
fuzz tests can be re-enabled.

Some targets could not be built due to a missing header file.
`oemcrypto/ref/src/cppbor.cpp` was updated to include the missing
header.

Bug: 235414753
Bug: 229160033
Bug: 236317198
Test: run_oemcrypto_fuzz_tests
Change-Id: Ieeebae1f6d84c5735a669d44ea45875675fdb5a3
2022-08-01 15:20:05 -07:00
Alex Dale
4455aeceed Fix InstallTestRSAKey() for provision 4 tests
[ Merge of http://go/wvgerrit/153589 ]

Some unit tests call InstallTestRSAKey() a few times. In current
provision 2 with Keybox, the test RSA DRM key is hard coded. But for
provision 4, it will be generated by OEMCrypto.

When a test calls multiple times of InstallTestRSAKey(), we don't want
the key to be generated during each call, and we want to use the same
key in order for the decrytion to work.

The fix to cache the drm key once it is created for prov 4 tests.

Bug: 180530495
Bug: 236317198
Test: oemcrypto_test
Change-Id: I1b2d96a89e0619861492e6d9bc56862e2c440c86
2022-06-23 14:48:19 -07:00
Alex Dale
073f478239 Implement GetDeviceId for prov4
[ Merge of http://go/wvgerrit/150349 ]

The device id for prov4 is hash of the encoded device public key
(COSE_key).

Also replaced a few bug numbers if it is prov3 specific (not related to prov4).

Bug: 225216277
Bug: 236317198
Test: oemcrypto_test
Change-Id: Ica1c8579c0a3ef83c70f331283c9cce629c6bb3f
2022-06-23 14:48:19 -07:00
Alex Dale
d874fffaec Support 32 bytes session key
[ Merge of http://go/wvgerrit/149849 ]

With ECC based DRM cert, the session key is expected to be 32, as
compared to 16 bytes in RSA case. This CL adds supports for 32 bytes
session key.

Bug: 236317198
Test: oemcrypto_test
Change-Id: I657fdd92d17736a23375ddcd457f83efa6ca6d1f
2022-06-23 14:48:19 -07:00
Alex Dale
9b04109b60 Merge "Updated OEMCrypto tests to use DRM key objects." 2022-06-21 20:52:08 +00:00
Cong Lin
f529e0d563 Add unit test for clear KCB in LS SDK 16.4 response am: 8c4c238324 am: 154a1db776
Original change: https://googleplex-android-review.googlesource.com/c/platform/vendor/widevine/+/18973819

Change-Id: I0224f6540925ad4b16988afd8e2bd76a12771c49
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
2022-06-18 08:26:02 +00:00