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Commit df66b729 authored by Yan Yan's avatar Yan Yan Committed by Automerger Merge Worker
Browse files

Merge changes I65dbc509,I1e338d9c,Ib4a0ed69,Iac7077b4,I9c53d425, ... am: 067b3dff 

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1603710

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I53ca8ed01491465bfbfcb9df42ddf6218cc1a326
parents e37cfaa9 067b3dff

core/java/android/net/vcn/persistablebundleutils/CertUtils.java

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/*

 * Copyright (C) 2021 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.

 */



package android.net.vcn.persistablebundleutils;



import java.io.ByteArrayInputStream;

import java.io.InputStream;

import java.security.cert.CertificateException;

import java.security.cert.CertificateFactory;

import java.security.cert.X509Certificate;

import java.util.Objects;



/**

 * CertUtils provides utility methods for constructing Certificate.

 *

 * @hide

 */

public class CertUtils {

    private static final String CERT_TYPE_X509 = "X.509";



    /** Decodes an ASN.1 DER encoded Certificate */

    public static X509Certificate certificateFromByteArray(byte[] derEncoded) {

        Objects.requireNonNull(derEncoded, "derEncoded is null");



        try {

            CertificateFactory certFactory = CertificateFactory.getInstance(CERT_TYPE_X509);

            InputStream in = new ByteArrayInputStream(derEncoded);

            return (X509Certificate) certFactory.generateCertificate(in);

        } catch (CertificateException e) {

            throw new IllegalArgumentException("Fail to decode certificate", e);

        }

    }

}

core/java/android/net/vcn/persistablebundleutils/ChildSaProposalUtils.java

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/*

 * Copyright (C) 2021 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.

 */



package android.net.vcn.persistablebundleutils;



import static com.android.internal.annotations.VisibleForTesting.Visibility;



import android.annotation.NonNull;

import android.net.ipsec.ike.ChildSaProposal;

import android.os.PersistableBundle;



import com.android.internal.annotations.VisibleForTesting;

import com.android.server.vcn.util.PersistableBundleUtils;



import java.util.List;

import java.util.Objects;



/**

 * Provides utility methods to convert ChildSaProposal to/from PersistableBundle.

 *

 * @hide

 */

@VisibleForTesting(visibility = Visibility.PRIVATE)

public final class ChildSaProposalUtils extends SaProposalUtilsBase {

    /** Serializes a ChildSaProposal to a PersistableBundle. */

    @NonNull

    public static PersistableBundle toPersistableBundle(ChildSaProposal proposal) {

        return SaProposalUtilsBase.toPersistableBundle(proposal);

    }



    /** Constructs a ChildSaProposal by deserializing a PersistableBundle. */

    @NonNull

    public static ChildSaProposal fromPersistableBundle(@NonNull PersistableBundle in) {

        Objects.requireNonNull(in, "PersistableBundle was null");



        final ChildSaProposal.Builder builder = new ChildSaProposal.Builder();



        final PersistableBundle encryptionBundle = in.getPersistableBundle(ENCRYPT_ALGO_KEY);

        Objects.requireNonNull(encryptionBundle, "Encryption algo bundle was null");

        final List<EncryptionAlgoKeyLenPair> encryptList =

                PersistableBundleUtils.toList(encryptionBundle, EncryptionAlgoKeyLenPair::new);

        for (EncryptionAlgoKeyLenPair t : encryptList) {

            builder.addEncryptionAlgorithm(t.encryptionAlgo, t.keyLen);

        }



        final int[] integrityAlgoIdArray = in.getIntArray(INTEGRITY_ALGO_KEY);

        Objects.requireNonNull(integrityAlgoIdArray, "Integrity algo array was null");

        for (int algo : integrityAlgoIdArray) {

            builder.addIntegrityAlgorithm(algo);

        }



        final int[] dhGroupArray = in.getIntArray(DH_GROUP_KEY);

        Objects.requireNonNull(dhGroupArray, "DH Group array was null");

        for (int dh : dhGroupArray) {

            builder.addDhGroup(dh);

        }



        return builder.build();

    }

}

core/java/android/net/vcn/persistablebundleutils/EapSessionConfigUtils.java

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/*

 * Copyright (C) 2021 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.

 */



package android.net.vcn.persistablebundleutils;





import static com.android.internal.annotations.VisibleForTesting.Visibility;



import android.annotation.NonNull;

import android.net.eap.EapSessionConfig;

import android.net.eap.EapSessionConfig.EapAkaConfig;

import android.net.eap.EapSessionConfig.EapAkaPrimeConfig;

import android.net.eap.EapSessionConfig.EapMethodConfig;

import android.net.eap.EapSessionConfig.EapMsChapV2Config;

import android.net.eap.EapSessionConfig.EapSimConfig;

import android.net.eap.EapSessionConfig.EapTtlsConfig;

import android.net.eap.EapSessionConfig.EapUiccConfig;

import android.os.PersistableBundle;



import com.android.internal.annotations.VisibleForTesting;

import com.android.server.vcn.util.PersistableBundleUtils;



import java.security.cert.CertificateEncodingException;

import java.security.cert.X509Certificate;

import java.util.Objects;



/**

 * Provides utility methods to convert EapSessionConfig to/from PersistableBundle.

 *

 * @hide

 */

@VisibleForTesting(visibility = Visibility.PRIVATE)

public final class EapSessionConfigUtils {

    private static final String EAP_ID_KEY = "EAP_ID_KEY";

    private static final String EAP_SIM_CONFIG_KEY = "EAP_SIM_CONFIG_KEY";

    private static final String EAP_TTLS_CONFIG_KEY = "EAP_TTLS_CONFIG_KEY";

    private static final String EAP_AKA_CONFIG_KEY = "EAP_AKA_CONFIG_KEY";

    private static final String EAP_MSCHAP_V2_CONFIG_KEY = "EAP_MSCHAP_V2_CONFIG_KEY";

    private static final String EAP_AKA_PRIME_CONFIG_KEY = "EAP_AKA_PRIME_CONFIG_KEY";



    /** Serializes an EapSessionConfig to a PersistableBundle. */

    @NonNull

    public static PersistableBundle toPersistableBundle(@NonNull EapSessionConfig config) {

        final PersistableBundle result = new PersistableBundle();



        result.putPersistableBundle(

                EAP_ID_KEY, PersistableBundleUtils.fromByteArray(config.getEapIdentity()));



        if (config.getEapSimConfig() != null) {

            result.putPersistableBundle(

                    EAP_SIM_CONFIG_KEY,

                    EapSimConfigUtils.toPersistableBundle(config.getEapSimConfig()));

        }



        if (config.getEapTtlsConfig() != null) {

            result.putPersistableBundle(

                    EAP_TTLS_CONFIG_KEY,

                    EapTtlsConfigUtils.toPersistableBundle(config.getEapTtlsConfig()));

        }



        if (config.getEapAkaConfig() != null) {

            result.putPersistableBundle(

                    EAP_AKA_CONFIG_KEY,

                    EapAkaConfigUtils.toPersistableBundle(config.getEapAkaConfig()));

        }



        if (config.getEapMsChapV2Config() != null) {

            result.putPersistableBundle(

                    EAP_MSCHAP_V2_CONFIG_KEY,

                    EapMsChapV2ConfigUtils.toPersistableBundle(config.getEapMsChapV2Config()));

        }



        if (config.getEapAkaPrimeConfig() != null) {

            result.putPersistableBundle(

                    EAP_AKA_PRIME_CONFIG_KEY,

                    EapAkaPrimeConfigUtils.toPersistableBundle(config.getEapAkaPrimeConfig()));

        }



        return result;

    }



    /** Constructs an EapSessionConfig by deserializing a PersistableBundle. */

    @NonNull

    public static EapSessionConfig fromPersistableBundle(@NonNull PersistableBundle in) {

        Objects.requireNonNull(in, "PersistableBundle was null");



        final EapSessionConfig.Builder builder = new EapSessionConfig.Builder();



        final PersistableBundle eapIdBundle = in.getPersistableBundle(EAP_ID_KEY);

        Objects.requireNonNull(eapIdBundle, "EAP ID was null");

        builder.setEapIdentity(PersistableBundleUtils.toByteArray(eapIdBundle));



        final PersistableBundle simBundle = in.getPersistableBundle(EAP_SIM_CONFIG_KEY);

        if (simBundle != null) {

            EapSimConfigUtils.setBuilderByReadingPersistableBundle(simBundle, builder);

        }



        final PersistableBundle ttlsBundle = in.getPersistableBundle(EAP_TTLS_CONFIG_KEY);

        if (ttlsBundle != null) {

            EapTtlsConfigUtils.setBuilderByReadingPersistableBundle(ttlsBundle, builder);

        }



        final PersistableBundle akaBundle = in.getPersistableBundle(EAP_AKA_CONFIG_KEY);

        if (akaBundle != null) {

            EapAkaConfigUtils.setBuilderByReadingPersistableBundle(akaBundle, builder);

        }



        final PersistableBundle msChapV2Bundle = in.getPersistableBundle(EAP_MSCHAP_V2_CONFIG_KEY);

        if (msChapV2Bundle != null) {

            EapMsChapV2ConfigUtils.setBuilderByReadingPersistableBundle(msChapV2Bundle, builder);

        }



        final PersistableBundle akaPrimeBundle = in.getPersistableBundle(EAP_AKA_PRIME_CONFIG_KEY);

        if (akaPrimeBundle != null) {

            EapAkaPrimeConfigUtils.setBuilderByReadingPersistableBundle(akaPrimeBundle, builder);

        }



        return builder.build();

    }



    private static class EapMethodConfigUtils {

        private static final String METHOD_TYPE = "METHOD_TYPE";



        /** Serializes an EapMethodConfig to a PersistableBundle. */

        @NonNull

        public static PersistableBundle toPersistableBundle(@NonNull EapMethodConfig config) {

            final PersistableBundle result = new PersistableBundle();

            result.putInt(METHOD_TYPE, config.getMethodType());

            return result;

        }

    }



    private static class EapUiccConfigUtils extends EapMethodConfigUtils {

        static final String SUB_ID_KEY = "SUB_ID_KEY";

        static final String APP_TYPE_KEY = "APP_TYPE_KEY";



        @NonNull

        protected static PersistableBundle toPersistableBundle(@NonNull EapUiccConfig config) {

            final PersistableBundle result = EapMethodConfigUtils.toPersistableBundle(config);

            result.putInt(SUB_ID_KEY, config.getSubId());

            result.putInt(APP_TYPE_KEY, config.getAppType());



            return result;

        }

    }



    private static final class EapSimConfigUtils extends EapUiccConfigUtils {

        @NonNull

        public static PersistableBundle toPersistableBundle(EapSimConfig config) {

            return EapUiccConfigUtils.toPersistableBundle(config);

        }



        public static void setBuilderByReadingPersistableBundle(

                @NonNull PersistableBundle in, @NonNull EapSessionConfig.Builder builder) {

            Objects.requireNonNull(in, "PersistableBundle was null");

            builder.setEapSimConfig(in.getInt(SUB_ID_KEY), in.getInt(APP_TYPE_KEY));

        }

    }



    private static class EapAkaConfigUtils extends EapUiccConfigUtils {

        @NonNull

        public static PersistableBundle toPersistableBundle(@NonNull EapAkaConfig config) {

            return EapUiccConfigUtils.toPersistableBundle(config);

        }



        public static void setBuilderByReadingPersistableBundle(

                @NonNull PersistableBundle in, @NonNull EapSessionConfig.Builder builder) {

            Objects.requireNonNull(in, "PersistableBundle was null");

            builder.setEapAkaConfig(in.getInt(SUB_ID_KEY), in.getInt(APP_TYPE_KEY));

        }

    }



    private static final class EapAkaPrimeConfigUtils extends EapAkaConfigUtils {

        private static final String NETWORK_NAME_KEY = "NETWORK_NAME_KEY";

        private static final String ALL_MISMATCHED_NETWORK_KEY = "ALL_MISMATCHED_NETWORK_KEY";



        @NonNull

        public static PersistableBundle toPersistableBundle(@NonNull EapAkaPrimeConfig config) {

            final PersistableBundle result = EapUiccConfigUtils.toPersistableBundle(config);

            result.putString(NETWORK_NAME_KEY, config.getNetworkName());

            result.putBoolean(ALL_MISMATCHED_NETWORK_KEY, config.allowsMismatchedNetworkNames());



            return result;

        }



        public static void setBuilderByReadingPersistableBundle(

                @NonNull PersistableBundle in, @NonNull EapSessionConfig.Builder builder) {

            Objects.requireNonNull(in, "PersistableBundle was null");

            builder.setEapAkaPrimeConfig(

                    in.getInt(SUB_ID_KEY),

                    in.getInt(APP_TYPE_KEY),

                    in.getString(NETWORK_NAME_KEY),

                    in.getBoolean(ALL_MISMATCHED_NETWORK_KEY));

        }

    }



    private static final class EapMsChapV2ConfigUtils extends EapMethodConfigUtils {

        private static final String USERNAME_KEY = "USERNAME_KEY";

        private static final String PASSWORD_KEY = "PASSWORD_KEY";



        @NonNull

        public static PersistableBundle toPersistableBundle(@NonNull EapMsChapV2Config config) {

            final PersistableBundle result = EapMethodConfigUtils.toPersistableBundle(config);

            result.putString(USERNAME_KEY, config.getUsername());

            result.putString(PASSWORD_KEY, config.getPassword());



            return result;

        }



        public static void setBuilderByReadingPersistableBundle(

                @NonNull PersistableBundle in, @NonNull EapSessionConfig.Builder builder) {

            Objects.requireNonNull(in, "PersistableBundle was null");

            builder.setEapMsChapV2Config(in.getString(USERNAME_KEY), in.getString(PASSWORD_KEY));

        }

    }



    private static final class EapTtlsConfigUtils extends EapMethodConfigUtils {

        private static final String TRUST_CERT_KEY = "TRUST_CERT_KEY";

        private static final String EAP_SESSION_CONFIG_KEY = "EAP_SESSION_CONFIG_KEY";



        @NonNull

        public static PersistableBundle toPersistableBundle(@NonNull EapTtlsConfig config) {

            final PersistableBundle result = EapMethodConfigUtils.toPersistableBundle(config);

            try {

                if (config.getServerCaCert() != null) {

                    final PersistableBundle caBundle =

                            PersistableBundleUtils.fromByteArray(

                                    config.getServerCaCert().getEncoded());

                    result.putPersistableBundle(TRUST_CERT_KEY, caBundle);

                }

            } catch (CertificateEncodingException e) {

                throw new IllegalStateException("Fail to encode the certificate");

            }



            result.putPersistableBundle(

                    EAP_SESSION_CONFIG_KEY,

                    EapSessionConfigUtils.toPersistableBundle(config.getInnerEapSessionConfig()));



            return result;

        }



        public static void setBuilderByReadingPersistableBundle(

                @NonNull PersistableBundle in, @NonNull EapSessionConfig.Builder builder) {

            Objects.requireNonNull(in, "PersistableBundle was null");



            final PersistableBundle caBundle = in.getPersistableBundle(TRUST_CERT_KEY);

            X509Certificate caCert = null;

            if (caBundle != null) {

                caCert =

                        CertUtils.certificateFromByteArray(

                                PersistableBundleUtils.toByteArray(caBundle));

            }



            final PersistableBundle eapSessionConfigBundle =

                    in.getPersistableBundle(EAP_SESSION_CONFIG_KEY);

            Objects.requireNonNull(eapSessionConfigBundle, "Inner EAP Session Config was null");

            final EapSessionConfig eapSessionConfig =

                    EapSessionConfigUtils.fromPersistableBundle(eapSessionConfigBundle);



            builder.setEapTtlsConfig(caCert, eapSessionConfig);

        }

    }

}

core/java/android/net/vcn/persistablebundleutils/IkeIdentificationUtils.java

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/*

 * Copyright (C) 2021 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.

 */



package android.net.vcn.persistablebundleutils;



import static com.android.internal.annotations.VisibleForTesting.Visibility;



import android.annotation.NonNull;

import android.net.InetAddresses;

import android.net.ipsec.ike.IkeDerAsn1DnIdentification;

import android.net.ipsec.ike.IkeFqdnIdentification;

import android.net.ipsec.ike.IkeIdentification;

import android.net.ipsec.ike.IkeIpv4AddrIdentification;

import android.net.ipsec.ike.IkeIpv6AddrIdentification;

import android.net.ipsec.ike.IkeKeyIdIdentification;

import android.net.ipsec.ike.IkeRfc822AddrIdentification;

import android.os.PersistableBundle;



import com.android.internal.annotations.VisibleForTesting;

import com.android.server.vcn.util.PersistableBundleUtils;



import java.net.Inet4Address;

import java.net.Inet6Address;

import java.util.Objects;



import javax.security.auth.x500.X500Principal;



/**

 * Abstract utility class to convert IkeIdentification to/from PersistableBundle.

 *

 * @hide

 */

@VisibleForTesting(visibility = Visibility.PRIVATE)

public final class IkeIdentificationUtils {

    private static final String ID_TYPE_KEY = "ID_TYPE_KEY";



    private static final String DER_ASN1_DN_KEY = "DER_ASN1_DN_KEY";

    private static final String FQDN_KEY = "FQDN_KEY";

    private static final String KEY_ID_KEY = "KEY_ID_KEY";

    private static final String IP4_ADDRESS_KEY = "IP4_ADDRESS_KEY";

    private static final String IP6_ADDRESS_KEY = "IP6_ADDRESS_KEY";

    private static final String RFC822_ADDRESS_KEY = "RFC822_ADDRESS_KEY";



    private static final int ID_TYPE_DER_ASN1_DN = 1;

    private static final int ID_TYPE_FQDN = 2;

    private static final int ID_TYPE_IPV4_ADDR = 3;

    private static final int ID_TYPE_IPV6_ADDR = 4;

    private static final int ID_TYPE_KEY_ID = 5;

    private static final int ID_TYPE_RFC822_ADDR = 6;



    /** Serializes an IkeIdentification to a PersistableBundle. */

    @NonNull

    public static PersistableBundle toPersistableBundle(@NonNull IkeIdentification ikeId) {

        if (ikeId instanceof IkeDerAsn1DnIdentification) {

            final PersistableBundle result = createPersistableBundle(ID_TYPE_DER_ASN1_DN);

            IkeDerAsn1DnIdentification id = (IkeDerAsn1DnIdentification) ikeId;

            result.putPersistableBundle(

                    DER_ASN1_DN_KEY,

                    PersistableBundleUtils.fromByteArray(id.derAsn1Dn.getEncoded()));

            return result;

        } else if (ikeId instanceof IkeFqdnIdentification) {

            final PersistableBundle result = createPersistableBundle(ID_TYPE_FQDN);

            IkeFqdnIdentification id = (IkeFqdnIdentification) ikeId;

            result.putString(FQDN_KEY, id.fqdn);

            return result;

        } else if (ikeId instanceof IkeIpv4AddrIdentification) {

            final PersistableBundle result = createPersistableBundle(ID_TYPE_IPV4_ADDR);

            IkeIpv4AddrIdentification id = (IkeIpv4AddrIdentification) ikeId;

            result.putString(IP4_ADDRESS_KEY, id.ipv4Address.getHostAddress());

            return result;

        } else if (ikeId instanceof IkeIpv6AddrIdentification) {

            final PersistableBundle result = createPersistableBundle(ID_TYPE_IPV6_ADDR);

            IkeIpv6AddrIdentification id = (IkeIpv6AddrIdentification) ikeId;

            result.putString(IP6_ADDRESS_KEY, id.ipv6Address.getHostAddress());

            return result;

        } else if (ikeId instanceof IkeKeyIdIdentification) {

            final PersistableBundle result = createPersistableBundle(ID_TYPE_KEY_ID);

            IkeKeyIdIdentification id = (IkeKeyIdIdentification) ikeId;

            result.putPersistableBundle(KEY_ID_KEY, PersistableBundleUtils.fromByteArray(id.keyId));

            return result;

        } else if (ikeId instanceof IkeRfc822AddrIdentification) {

            final PersistableBundle result = createPersistableBundle(ID_TYPE_RFC822_ADDR);

            IkeRfc822AddrIdentification id = (IkeRfc822AddrIdentification) ikeId;

            result.putString(RFC822_ADDRESS_KEY, id.rfc822Name);

            return result;

        } else {

            throw new IllegalStateException("Unrecognized IkeIdentification subclass");

        }

    }



    private static PersistableBundle createPersistableBundle(int idType) {

        final PersistableBundle result = new PersistableBundle();

        result.putInt(ID_TYPE_KEY, idType);

        return result;

    }



    /** Constructs an IkeIdentification by deserializing a PersistableBundle. */

    @NonNull

    public static IkeIdentification fromPersistableBundle(@NonNull PersistableBundle in) {

        Objects.requireNonNull(in, "PersistableBundle was null");

        int idType = in.getInt(ID_TYPE_KEY);

        switch (idType) {

            case ID_TYPE_DER_ASN1_DN:

                final PersistableBundle dnBundle = in.getPersistableBundle(DER_ASN1_DN_KEY);

                Objects.requireNonNull(dnBundle, "ASN1 DN was null");

                return new IkeDerAsn1DnIdentification(

                        new X500Principal(PersistableBundleUtils.toByteArray(dnBundle)));

            case ID_TYPE_FQDN:

                return new IkeFqdnIdentification(in.getString(FQDN_KEY));

            case ID_TYPE_IPV4_ADDR:

                final String v4AddressStr = in.getString(IP4_ADDRESS_KEY);

                Objects.requireNonNull(v4AddressStr, "IPv4 address was null");

                return new IkeIpv4AddrIdentification(

                        (Inet4Address) InetAddresses.parseNumericAddress(v4AddressStr));

            case ID_TYPE_IPV6_ADDR:

                final String v6AddressStr = in.getString(IP6_ADDRESS_KEY);

                Objects.requireNonNull(v6AddressStr, "IPv6 address was null");

                return new IkeIpv6AddrIdentification(

                        (Inet6Address) InetAddresses.parseNumericAddress(v6AddressStr));

            case ID_TYPE_KEY_ID:

                final PersistableBundle keyIdBundle = in.getPersistableBundle(KEY_ID_KEY);

                Objects.requireNonNull(in, "Key ID was null");

                return new IkeKeyIdIdentification(PersistableBundleUtils.toByteArray(keyIdBundle));

            case ID_TYPE_RFC822_ADDR:

                return new IkeRfc822AddrIdentification(in.getString(RFC822_ADDRESS_KEY));

            default:

                throw new IllegalStateException("Unrecognized IKE ID type: " + idType);

        }

    }

}

core/java/android/net/vcn/persistablebundleutils/IkeSaProposalUtils.java

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