security/secretkeeper/aidl/vts/dice_sample.rs - android_hardware_interfaces - Gitiles

 /*
  * Copyright (C) 2023 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 //! This module provides a set of sample DICE chains for testing purpose only. Note that this
 //! module duplicates a large chunk of code in libdiced_sample_inputs. We avoid modifying the
 //! latter for testing purposes because it is installed on device.

 use ciborium::{de, ser, value::Value};
 use core::ffi::CStr;
 use coset::{iana, Algorithm, AsCborValue, CoseKey, KeyOperation, KeyType, Label};
 use diced_open_dice::{
     derive_cdi_private_key_seed, keypair_from_seed, retry_bcc_format_config_descriptor,
     retry_bcc_main_flow, retry_dice_main_flow, Config, DiceArtifacts, DiceConfigValues, DiceError,
     DiceMode, InputValues, OwnedDiceArtifacts, CDI_SIZE, HASH_SIZE, HIDDEN_SIZE,
 };
 use log::error;
 use secretkeeper_client::dice::OwnedDiceArtifactsWithExplicitKey;

 /// Sample UDS used to perform the root DICE flow by `make_sample_bcc_and_cdis`.
 const UDS: &[u8; CDI_SIZE] = &[
     0x65, 0x4f, 0xab, 0xa9, 0xa5, 0xad, 0x0f, 0x5e, 0x15, 0xc3, 0x12, 0xf7, 0x77, 0x45, 0xfa, 0x55,
     0x18, 0x6a, 0xa6, 0x34, 0xb6, 0x7c, 0x82, 0x7b, 0x89, 0x4c, 0xc5, 0x52, 0xd3, 0x27, 0x35, 0x8e,
 ];

 const CODE_HASH_ABL: [u8; HASH_SIZE] = [
     0x16, 0x48, 0xf2, 0x55, 0x53, 0x23, 0xdd, 0x15, 0x2e, 0x83, 0x38, 0xc3, 0x64, 0x38, 0x63, 0x26,
     0x0f, 0xcf, 0x5b, 0xd1, 0x3a, 0xd3, 0x40, 0x3e, 0x23, 0xf8, 0x34, 0x4c, 0x6d, 0xa2, 0xbe, 0x25,
     0x1c, 0xb0, 0x29, 0xe8, 0xc3, 0xfb, 0xb8, 0x80, 0xdc, 0xb1, 0xd2, 0xb3, 0x91, 0x4d, 0xd3, 0xfb,
     0x01, 0x0f, 0xe4, 0xe9, 0x46, 0xa2, 0xc0, 0x26, 0x57, 0x5a, 0xba, 0x30, 0xf7, 0x15, 0x98, 0x14,
 ];
 const AUTHORITY_HASH_ABL: [u8; HASH_SIZE] = [
     0xf9, 0x00, 0x9d, 0xc2, 0x59, 0x09, 0xe0, 0xb6, 0x98, 0xbd, 0xe3, 0x97, 0x4a, 0xcb, 0x3c, 0xe7,
     0x6b, 0x24, 0xc3, 0xe4, 0x98, 0xdd, 0xa9, 0x6a, 0x41, 0x59, 0x15, 0xb1, 0x23, 0xe6, 0xc8, 0xdf,
     0xfb, 0x52, 0xb4, 0x52, 0xc1, 0xb9, 0x61, 0xdd, 0xbc, 0x5b, 0x37, 0x0e, 0x12, 0x12, 0xb2, 0xfd,
     0xc1, 0x09, 0xb0, 0xcf, 0x33, 0x81, 0x4c, 0xc6, 0x29, 0x1b, 0x99, 0xea, 0xae, 0xfd, 0xaa, 0x0d,
 ];
 const HIDDEN_ABL: [u8; HIDDEN_SIZE] = [
     0xa2, 0x01, 0xd0, 0xc0, 0xaa, 0x75, 0x3c, 0x06, 0x43, 0x98, 0x6c, 0xc3, 0x5a, 0xb5, 0x5f, 0x1f,
     0x0f, 0x92, 0x44, 0x3b, 0x0e, 0xd4, 0x29, 0x75, 0xe3, 0xdb, 0x36, 0xda, 0xc8, 0x07, 0x97, 0x4d,
     0xff, 0xbc, 0x6a, 0xa4, 0x8a, 0xef, 0xc4, 0x7f, 0xf8, 0x61, 0x7d, 0x51, 0x4d, 0x2f, 0xdf, 0x7e,
     0x8c, 0x3d, 0xa3, 0xfc, 0x63, 0xd4, 0xd4, 0x74, 0x8a, 0xc4, 0x14, 0x45, 0x83, 0x6b, 0x12, 0x7e,
 ];
 const CODE_HASH_AVB: [u8; HASH_SIZE] = [
     0xa4, 0x0c, 0xcb, 0xc1, 0xbf, 0xfa, 0xcc, 0xfd, 0xeb, 0xf4, 0xfc, 0x43, 0x83, 0x7f, 0x46, 0x8d,
     0xd8, 0xd8, 0x14, 0xc1, 0x96, 0x14, 0x1f, 0x6e, 0xb3, 0xa0, 0xd9, 0x56, 0xb3, 0xbf, 0x2f, 0xfa,
     0x88, 0x70, 0x11, 0x07, 0x39, 0xa4, 0xd2, 0xa9, 0x6b, 0x18, 0x28, 0xe8, 0x29, 0x20, 0x49, 0x0f,
     0xbb, 0x8d, 0x08, 0x8c, 0xc6, 0x54, 0xe9, 0x71, 0xd2, 0x7e, 0xa4, 0xfe, 0x58, 0x7f, 0xd3, 0xc7,
 ];
 const AUTHORITY_HASH_AVB: [u8; HASH_SIZE] = [
     0xb2, 0x69, 0x05, 0x48, 0x56, 0xb5, 0xfa, 0x55, 0x6f, 0xac, 0x56, 0xd9, 0x02, 0x35, 0x2b, 0xaa,
     0x4c, 0xba, 0x28, 0xdd, 0x82, 0x3a, 0x86, 0xf5, 0xd4, 0xc2, 0xf1, 0xf9, 0x35, 0x7d, 0xe4, 0x43,
     0x13, 0xbf, 0xfe, 0xd3, 0x36, 0xd8, 0x1c, 0x12, 0x78, 0x5c, 0x9c, 0x3e, 0xf6, 0x66, 0xef, 0xab,
     0x3d, 0x0f, 0x89, 0xa4, 0x6f, 0xc9, 0x72, 0xee, 0x73, 0x43, 0x02, 0x8a, 0xef, 0xbc, 0x05, 0x98,
 ];
 const HIDDEN_AVB: [u8; HIDDEN_SIZE] = [
     0x5b, 0x3f, 0xc9, 0x6b, 0xe3, 0x95, 0x59, 0x40, 0x5e, 0x64, 0xe5, 0x64, 0x3f, 0xfd, 0x21, 0x09,
     0x9d, 0xf3, 0xcd, 0xc7, 0xa4, 0x2a, 0xe2, 0x97, 0xdd, 0xe2, 0x4f, 0xb0, 0x7d, 0x7e, 0xf5, 0x8e,
     0xd6, 0x4d, 0x84, 0x25, 0x54, 0x41, 0x3f, 0x8f, 0x78, 0x64, 0x1a, 0x51, 0x27, 0x9d, 0x55, 0x8a,
     0xe9, 0x90, 0x35, 0xab, 0x39, 0x80, 0x4b, 0x94, 0x40, 0x84, 0xa2, 0xfd, 0x73, 0xeb, 0x35, 0x7a,
 ];
 const AUTHORITY_HASH_ANDROID: [u8; HASH_SIZE] = [
     0x04, 0x25, 0x5d, 0x60, 0x5f, 0x5c, 0x45, 0x0d, 0xf2, 0x9a, 0x6e, 0x99, 0x30, 0x03, 0xb8, 0xd6,
     0xe1, 0x99, 0x71, 0x1b, 0xf8, 0x44, 0xfa, 0xb5, 0x31, 0x79, 0x1c, 0x37, 0x68, 0x4e, 0x1d, 0xc0,
     0x24, 0x74, 0x68, 0xf8, 0x80, 0x20, 0x3e, 0x44, 0xb1, 0x43, 0xd2, 0x9c, 0xfc, 0x12, 0x9e, 0x77,
     0x0a, 0xde, 0x29, 0x24, 0xff, 0x2e, 0xfa, 0xc7, 0x10, 0xd5, 0x73, 0xd4, 0xc6, 0xdf, 0x62, 0x9f,
 ];

 /// Encode the public key to CBOR Value. The input (raw 32 bytes) is wrapped into CoseKey.
 fn ed25519_public_key_to_cbor_value(public_key: &[u8]) -> Value {
     let key = CoseKey {
         kty: KeyType::Assigned(iana::KeyType::OKP),
         alg: Some(Algorithm::Assigned(iana::Algorithm::EdDSA)),
         key_ops: vec![KeyOperation::Assigned(iana::KeyOperation::Verify)].into_iter().collect(),
         params: vec![
             (
                 Label::Int(iana::Ec2KeyParameter::Crv as i64),
                 Value::from(iana::EllipticCurve::Ed25519 as u64),
             ),
             (Label::Int(iana::Ec2KeyParameter::X as i64), Value::Bytes(public_key.to_vec())),
         ],
         ..Default::default()
     };
     key.to_cbor_value().unwrap()
 }

 /// Makes a DICE chain (BCC) from the sample input.
 ///
 /// The DICE chain is of the following format:
 /// public key derived from UDS -> ABL certificate -> AVB certificate -> Android certificate
 /// The `security_version` is included in the Android certificate.
 pub fn make_explicit_owned_dice(security_version: u64) -> OwnedDiceArtifactsWithExplicitKey {
     let dice = make_sample_bcc_and_cdis(security_version);
     OwnedDiceArtifactsWithExplicitKey::from_owned_artifacts(dice).unwrap()
 }

 fn make_sample_bcc_and_cdis(security_version: u64) -> OwnedDiceArtifacts {
     let private_key_seed = derive_cdi_private_key_seed(UDS).unwrap();

     // Gets the root public key in DICE chain (BCC).
     let (public_key, _) = keypair_from_seed(private_key_seed.as_array()).unwrap();
     let ed25519_public_key_value = ed25519_public_key_to_cbor_value(&public_key);

     // Gets the ABL certificate to as the root certificate of DICE chain.
     let config_values = DiceConfigValues {
         component_name: Some(CStr::from_bytes_with_nul(b"ABL\0").unwrap()),
         component_version: Some(1),
         resettable: true,
         ..Default::default()
     };
     let config_descriptor = retry_bcc_format_config_descriptor(&config_values).unwrap();
     let input_values = InputValues::new(
         CODE_HASH_ABL,
         Config::Descriptor(config_descriptor.as_slice()),
         AUTHORITY_HASH_ABL,
         DiceMode::kDiceModeNormal,
         HIDDEN_ABL,
     );
     let (cdi_values, cert) = retry_dice_main_flow(UDS, UDS, &input_values).unwrap();
     let bcc_value =
         Value::Array(vec![ed25519_public_key_value, de::from_reader(&cert[..]).unwrap()]);
     let mut bcc: Vec<u8> = vec![];
     ser::into_writer(&bcc_value, &mut bcc).unwrap();

     // Appends AVB certificate to DICE chain.
     let config_values = DiceConfigValues {
         component_name: Some(CStr::from_bytes_with_nul(b"AVB\0").unwrap()),
         component_version: Some(1),
         resettable: true,
         ..Default::default()
     };
     let config_descriptor = retry_bcc_format_config_descriptor(&config_values).unwrap();
     let input_values = InputValues::new(
         CODE_HASH_AVB,
         Config::Descriptor(config_descriptor.as_slice()),
         AUTHORITY_HASH_AVB,
         DiceMode::kDiceModeNormal,
         HIDDEN_AVB,
     );
     let dice_artifacts =
         retry_bcc_main_flow(&cdi_values.cdi_attest, &cdi_values.cdi_seal, &bcc, &input_values)
             .unwrap();

     // Appends Android certificate to DICE chain.
     let config_values = DiceConfigValues {
         component_name: Some(CStr::from_bytes_with_nul(b"Android\0").unwrap()),
         component_version: Some(12),
         security_version: Some(security_version),
         resettable: true,
         ..Default::default()
     };
     let config_descriptor = retry_bcc_format_config_descriptor(&config_values).unwrap();
     let input_values = InputValues::new(
         [0u8; HASH_SIZE], // code_hash
         Config::Descriptor(config_descriptor.as_slice()),
         AUTHORITY_HASH_ANDROID,
         DiceMode::kDiceModeNormal,
         [0u8; HIDDEN_SIZE], // hidden
     );
     retry_bcc_main_flow(
         dice_artifacts.cdi_attest(),
         dice_artifacts.cdi_seal(),
         dice_artifacts
             .bcc()
             .ok_or_else(|| {
                 error!("bcc is none");
                 DiceError::InvalidInput
             })
             .unwrap(),
         &input_values,
     )
     .unwrap()
 }
	/*
	* Copyright (C) 2023 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	//! This module provides a set of sample DICE chains for testing purpose only. Note that this
	//! module duplicates a large chunk of code in libdiced_sample_inputs. We avoid modifying the
	//! latter for testing purposes because it is installed on device.

	use ciborium::{de, ser, value::Value};
	use core::ffi::CStr;
	use coset::{iana, Algorithm, AsCborValue, CoseKey, KeyOperation, KeyType, Label};
	use diced_open_dice::{
	derive_cdi_private_key_seed, keypair_from_seed, retry_bcc_format_config_descriptor,
	retry_bcc_main_flow, retry_dice_main_flow, Config, DiceArtifacts, DiceConfigValues, DiceError,
	DiceMode, InputValues, OwnedDiceArtifacts, CDI_SIZE, HASH_SIZE, HIDDEN_SIZE,
	};
	use log::error;
	use secretkeeper_client::dice::OwnedDiceArtifactsWithExplicitKey;

	/// Sample UDS used to perform the root DICE flow by `make_sample_bcc_and_cdis`.
	const UDS: &[u8; CDI_SIZE] = &[
	0x65, 0x4f, 0xab, 0xa9, 0xa5, 0xad, 0x0f, 0x5e, 0x15, 0xc3, 0x12, 0xf7, 0x77, 0x45, 0xfa, 0x55,
	0x18, 0x6a, 0xa6, 0x34, 0xb6, 0x7c, 0x82, 0x7b, 0x89, 0x4c, 0xc5, 0x52, 0xd3, 0x27, 0x35, 0x8e,
	];

	const CODE_HASH_ABL: [u8; HASH_SIZE] = [
	0x16, 0x48, 0xf2, 0x55, 0x53, 0x23, 0xdd, 0x15, 0x2e, 0x83, 0x38, 0xc3, 0x64, 0x38, 0x63, 0x26,
	0x0f, 0xcf, 0x5b, 0xd1, 0x3a, 0xd3, 0x40, 0x3e, 0x23, 0xf8, 0x34, 0x4c, 0x6d, 0xa2, 0xbe, 0x25,
	0x1c, 0xb0, 0x29, 0xe8, 0xc3, 0xfb, 0xb8, 0x80, 0xdc, 0xb1, 0xd2, 0xb3, 0x91, 0x4d, 0xd3, 0xfb,
	0x01, 0x0f, 0xe4, 0xe9, 0x46, 0xa2, 0xc0, 0x26, 0x57, 0x5a, 0xba, 0x30, 0xf7, 0x15, 0x98, 0x14,
	];
	const AUTHORITY_HASH_ABL: [u8; HASH_SIZE] = [
	0xf9, 0x00, 0x9d, 0xc2, 0x59, 0x09, 0xe0, 0xb6, 0x98, 0xbd, 0xe3, 0x97, 0x4a, 0xcb, 0x3c, 0xe7,
	0x6b, 0x24, 0xc3, 0xe4, 0x98, 0xdd, 0xa9, 0x6a, 0x41, 0x59, 0x15, 0xb1, 0x23, 0xe6, 0xc8, 0xdf,
	0xfb, 0x52, 0xb4, 0x52, 0xc1, 0xb9, 0x61, 0xdd, 0xbc, 0x5b, 0x37, 0x0e, 0x12, 0x12, 0xb2, 0xfd,
	0xc1, 0x09, 0xb0, 0xcf, 0x33, 0x81, 0x4c, 0xc6, 0x29, 0x1b, 0x99, 0xea, 0xae, 0xfd, 0xaa, 0x0d,
	];
	const HIDDEN_ABL: [u8; HIDDEN_SIZE] = [
	0xa2, 0x01, 0xd0, 0xc0, 0xaa, 0x75, 0x3c, 0x06, 0x43, 0x98, 0x6c, 0xc3, 0x5a, 0xb5, 0x5f, 0x1f,
	0x0f, 0x92, 0x44, 0x3b, 0x0e, 0xd4, 0x29, 0x75, 0xe3, 0xdb, 0x36, 0xda, 0xc8, 0x07, 0x97, 0x4d,
	0xff, 0xbc, 0x6a, 0xa4, 0x8a, 0xef, 0xc4, 0x7f, 0xf8, 0x61, 0x7d, 0x51, 0x4d, 0x2f, 0xdf, 0x7e,
	0x8c, 0x3d, 0xa3, 0xfc, 0x63, 0xd4, 0xd4, 0x74, 0x8a, 0xc4, 0x14, 0x45, 0x83, 0x6b, 0x12, 0x7e,
	];
	const CODE_HASH_AVB: [u8; HASH_SIZE] = [
	0xa4, 0x0c, 0xcb, 0xc1, 0xbf, 0xfa, 0xcc, 0xfd, 0xeb, 0xf4, 0xfc, 0x43, 0x83, 0x7f, 0x46, 0x8d,
	0xd8, 0xd8, 0x14, 0xc1, 0x96, 0x14, 0x1f, 0x6e, 0xb3, 0xa0, 0xd9, 0x56, 0xb3, 0xbf, 0x2f, 0xfa,
	0x88, 0x70, 0x11, 0x07, 0x39, 0xa4, 0xd2, 0xa9, 0x6b, 0x18, 0x28, 0xe8, 0x29, 0x20, 0x49, 0x0f,
	0xbb, 0x8d, 0x08, 0x8c, 0xc6, 0x54, 0xe9, 0x71, 0xd2, 0x7e, 0xa4, 0xfe, 0x58, 0x7f, 0xd3, 0xc7,
	];
	const AUTHORITY_HASH_AVB: [u8; HASH_SIZE] = [
	0xb2, 0x69, 0x05, 0x48, 0x56, 0xb5, 0xfa, 0x55, 0x6f, 0xac, 0x56, 0xd9, 0x02, 0x35, 0x2b, 0xaa,
	0x4c, 0xba, 0x28, 0xdd, 0x82, 0x3a, 0x86, 0xf5, 0xd4, 0xc2, 0xf1, 0xf9, 0x35, 0x7d, 0xe4, 0x43,
	0x13, 0xbf, 0xfe, 0xd3, 0x36, 0xd8, 0x1c, 0x12, 0x78, 0x5c, 0x9c, 0x3e, 0xf6, 0x66, 0xef, 0xab,
	0x3d, 0x0f, 0x89, 0xa4, 0x6f, 0xc9, 0x72, 0xee, 0x73, 0x43, 0x02, 0x8a, 0xef, 0xbc, 0x05, 0x98,
	];
	const HIDDEN_AVB: [u8; HIDDEN_SIZE] = [
	0x5b, 0x3f, 0xc9, 0x6b, 0xe3, 0x95, 0x59, 0x40, 0x5e, 0x64, 0xe5, 0x64, 0x3f, 0xfd, 0x21, 0x09,
	0x9d, 0xf3, 0xcd, 0xc7, 0xa4, 0x2a, 0xe2, 0x97, 0xdd, 0xe2, 0x4f, 0xb0, 0x7d, 0x7e, 0xf5, 0x8e,
	0xd6, 0x4d, 0x84, 0x25, 0x54, 0x41, 0x3f, 0x8f, 0x78, 0x64, 0x1a, 0x51, 0x27, 0x9d, 0x55, 0x8a,
	0xe9, 0x90, 0x35, 0xab, 0x39, 0x80, 0x4b, 0x94, 0x40, 0x84, 0xa2, 0xfd, 0x73, 0xeb, 0x35, 0x7a,
	];
	const AUTHORITY_HASH_ANDROID: [u8; HASH_SIZE] = [
	0x04, 0x25, 0x5d, 0x60, 0x5f, 0x5c, 0x45, 0x0d, 0xf2, 0x9a, 0x6e, 0x99, 0x30, 0x03, 0xb8, 0xd6,
	0xe1, 0x99, 0x71, 0x1b, 0xf8, 0x44, 0xfa, 0xb5, 0x31, 0x79, 0x1c, 0x37, 0x68, 0x4e, 0x1d, 0xc0,
	0x24, 0x74, 0x68, 0xf8, 0x80, 0x20, 0x3e, 0x44, 0xb1, 0x43, 0xd2, 0x9c, 0xfc, 0x12, 0x9e, 0x77,
	0x0a, 0xde, 0x29, 0x24, 0xff, 0x2e, 0xfa, 0xc7, 0x10, 0xd5, 0x73, 0xd4, 0xc6, 0xdf, 0x62, 0x9f,
	];

	/// Encode the public key to CBOR Value. The input (raw 32 bytes) is wrapped into CoseKey.
	fn ed25519_public_key_to_cbor_value(public_key: &[u8]) -> Value {
	let key = CoseKey {
	kty: KeyType::Assigned(iana::KeyType::OKP),
	alg: Some(Algorithm::Assigned(iana::Algorithm::EdDSA)),
	key_ops: vec![KeyOperation::Assigned(iana::KeyOperation::Verify)].into_iter().collect(),
	params: vec![
	(
	Label::Int(iana::Ec2KeyParameter::Crv as i64),
	Value::from(iana::EllipticCurve::Ed25519 as u64),
	),
	(Label::Int(iana::Ec2KeyParameter::X as i64), Value::Bytes(public_key.to_vec())),
	],
	..Default::default()
	};
	key.to_cbor_value().unwrap()
	}

	/// Makes a DICE chain (BCC) from the sample input.
	///
	/// The DICE chain is of the following format:
	/// public key derived from UDS -> ABL certificate -> AVB certificate -> Android certificate
	/// The `security_version` is included in the Android certificate.
	pub fn make_explicit_owned_dice(security_version: u64) -> OwnedDiceArtifactsWithExplicitKey {
	let dice = make_sample_bcc_and_cdis(security_version);
	OwnedDiceArtifactsWithExplicitKey::from_owned_artifacts(dice).unwrap()
	}

	fn make_sample_bcc_and_cdis(security_version: u64) -> OwnedDiceArtifacts {
	let private_key_seed = derive_cdi_private_key_seed(UDS).unwrap();

	// Gets the root public key in DICE chain (BCC).
	let (public_key, _) = keypair_from_seed(private_key_seed.as_array()).unwrap();
	let ed25519_public_key_value = ed25519_public_key_to_cbor_value(&public_key);

	// Gets the ABL certificate to as the root certificate of DICE chain.
	let config_values = DiceConfigValues {
	component_name: Some(CStr::from_bytes_with_nul(b"ABL\0").unwrap()),
	component_version: Some(1),
	resettable: true,
	..Default::default()
	};
	let config_descriptor = retry_bcc_format_config_descriptor(&config_values).unwrap();
	let input_values = InputValues::new(
	CODE_HASH_ABL,
	Config::Descriptor(config_descriptor.as_slice()),
	AUTHORITY_HASH_ABL,
	DiceMode::kDiceModeNormal,
	HIDDEN_ABL,
	);
	let (cdi_values, cert) = retry_dice_main_flow(UDS, UDS, &input_values).unwrap();
	let bcc_value =
	Value::Array(vec![ed25519_public_key_value, de::from_reader(&cert[..]).unwrap()]);
	let mut bcc: Vec<u8> = vec![];
	ser::into_writer(&bcc_value, &mut bcc).unwrap();

	// Appends AVB certificate to DICE chain.
	let config_values = DiceConfigValues {
	component_name: Some(CStr::from_bytes_with_nul(b"AVB\0").unwrap()),
	component_version: Some(1),
	resettable: true,
	..Default::default()
	};
	let config_descriptor = retry_bcc_format_config_descriptor(&config_values).unwrap();
	let input_values = InputValues::new(
	CODE_HASH_AVB,
	Config::Descriptor(config_descriptor.as_slice()),
	AUTHORITY_HASH_AVB,
	DiceMode::kDiceModeNormal,
	HIDDEN_AVB,
	);
	let dice_artifacts =
	retry_bcc_main_flow(&cdi_values.cdi_attest, &cdi_values.cdi_seal, &bcc, &input_values)
	.unwrap();

	// Appends Android certificate to DICE chain.
	let config_values = DiceConfigValues {
	component_name: Some(CStr::from_bytes_with_nul(b"Android\0").unwrap()),
	component_version: Some(12),
	security_version: Some(security_version),
	resettable: true,
	..Default::default()
	};
	let config_descriptor = retry_bcc_format_config_descriptor(&config_values).unwrap();
	let input_values = InputValues::new(
	[0u8; HASH_SIZE], // code_hash
	Config::Descriptor(config_descriptor.as_slice()),
	AUTHORITY_HASH_ANDROID,
	DiceMode::kDiceModeNormal,
	[0u8; HIDDEN_SIZE], // hidden
	);
	retry_bcc_main_flow(
	dice_artifacts.cdi_attest(),
	dice_artifacts.cdi_seal(),
	dice_artifacts
	.bcc()
	.ok_or_else(\|\| {
	error!("bcc is none");
	DiceError::InvalidInput
	})
	.unwrap(),
	&input_values,
	)
	.unwrap()
	}