| /* |
| * Copyright (C) 2022 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.nearby; |
| |
| import android.annotation.NonNull; |
| import android.annotation.Nullable; |
| import android.annotation.SystemApi; |
| import android.os.Parcel; |
| import android.os.Parcelable; |
| |
| import com.android.internal.util.Preconditions; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import java.util.Objects; |
| |
| /** |
| * Represents a public credential. |
| * |
| * @hide |
| */ |
| @SystemApi |
| public final class PublicCredential extends PresenceCredential implements Parcelable { |
| @NonNull |
| public static final Creator<PublicCredential> CREATOR = |
| new Creator<PublicCredential>() { |
| @Override |
| public PublicCredential createFromParcel(Parcel in) { |
| in.readInt(); // Skip the type as it's used by parent class only. |
| return createFromParcelBody(in); |
| } |
| |
| @Override |
| public PublicCredential[] newArray(int size) { |
| return new PublicCredential[size]; |
| } |
| }; |
| |
| private final byte[] mPublicKey; |
| private final byte[] mEncryptedMetadata; |
| private final byte[] mEncryptedMetadataKeyTag; |
| |
| private PublicCredential( |
| int identityType, |
| byte[] secretId, |
| byte[] authenticityKey, |
| List<CredentialElement> credentialElements, |
| byte[] publicKey, |
| byte[] encryptedMetadata, |
| byte[] metadataEncryptionKeyTag) { |
| super(CREDENTIAL_TYPE_PUBLIC, identityType, secretId, authenticityKey, credentialElements); |
| mPublicKey = publicKey; |
| mEncryptedMetadata = encryptedMetadata; |
| mEncryptedMetadataKeyTag = metadataEncryptionKeyTag; |
| } |
| |
| private PublicCredential(Parcel in) { |
| super(CREDENTIAL_TYPE_PUBLIC, in); |
| mPublicKey = new byte[in.readInt()]; |
| in.readByteArray(mPublicKey); |
| mEncryptedMetadata = new byte[in.readInt()]; |
| in.readByteArray(mEncryptedMetadata); |
| mEncryptedMetadataKeyTag = new byte[in.readInt()]; |
| in.readByteArray(mEncryptedMetadataKeyTag); |
| } |
| |
| static PublicCredential createFromParcelBody(Parcel in) { |
| return new PublicCredential(in); |
| } |
| |
| /** Returns the public key associated with this credential. */ |
| @NonNull |
| public byte[] getPublicKey() { |
| return mPublicKey; |
| } |
| |
| /** Returns the encrypted metadata associated with this credential. */ |
| @NonNull |
| public byte[] getEncryptedMetadata() { |
| return mEncryptedMetadata; |
| } |
| |
| /** Returns the metadata encryption key tag associated with this credential. */ |
| @NonNull |
| public byte[] getEncryptedMetadataKeyTag() { |
| return mEncryptedMetadataKeyTag; |
| } |
| |
| @Override |
| public int describeContents() { |
| return 0; |
| } |
| |
| @Override |
| public boolean equals(@Nullable Object obj) { |
| if (obj instanceof PublicCredential) { |
| PublicCredential that = (PublicCredential) obj; |
| return super.equals(obj) |
| && Arrays.equals(mPublicKey, that.mPublicKey) |
| && Arrays.equals(mEncryptedMetadata, that.mEncryptedMetadata) |
| && Arrays.equals(mEncryptedMetadataKeyTag, that.mEncryptedMetadataKeyTag); |
| } |
| return false; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash( |
| super.hashCode(), |
| Arrays.hashCode(mPublicKey), |
| Arrays.hashCode(mEncryptedMetadata), |
| Arrays.hashCode(mEncryptedMetadataKeyTag)); |
| } |
| |
| @Override |
| public void writeToParcel(@NonNull Parcel dest, int flags) { |
| super.writeToParcel(dest, flags); |
| dest.writeInt(mPublicKey.length); |
| dest.writeByteArray(mPublicKey); |
| dest.writeInt(mEncryptedMetadata.length); |
| dest.writeByteArray(mEncryptedMetadata); |
| dest.writeInt(mEncryptedMetadataKeyTag.length); |
| dest.writeByteArray(mEncryptedMetadataKeyTag); |
| } |
| |
| /** Builder class for {@link PresenceCredential}. */ |
| public static final class Builder { |
| private final List<CredentialElement> mCredentialElements; |
| |
| private @IdentityType int mIdentityType; |
| private final byte[] mSecretId; |
| private final byte[] mAuthenticityKey; |
| private final byte[] mPublicKey; |
| private final byte[] mEncryptedMetadata; |
| private final byte[] mEncryptedMetadataKeyTag; |
| |
| public Builder( |
| @NonNull byte[] secretId, |
| @NonNull byte[] authenticityKey, |
| @NonNull byte[] publicKey, |
| @NonNull byte[] encryptedMetadata, |
| @NonNull byte[] encryptedMetadataKeyTag) { |
| Preconditions.checkState( |
| secretId != null && secretId.length > 0, "secret id cannot be empty"); |
| Preconditions.checkState( |
| authenticityKey != null && authenticityKey.length > 0, |
| "authenticity key cannot be empty"); |
| Preconditions.checkState( |
| publicKey != null && publicKey.length > 0, "publicKey cannot be empty"); |
| Preconditions.checkState( |
| encryptedMetadata != null && encryptedMetadata.length > 0, |
| "encryptedMetadata cannot be empty"); |
| Preconditions.checkState( |
| encryptedMetadataKeyTag != null && encryptedMetadataKeyTag.length > 0, |
| "encryptedMetadataKeyTag cannot be empty"); |
| |
| mSecretId = secretId; |
| mAuthenticityKey = authenticityKey; |
| mPublicKey = publicKey; |
| mEncryptedMetadata = encryptedMetadata; |
| mEncryptedMetadataKeyTag = encryptedMetadataKeyTag; |
| mCredentialElements = new ArrayList<>(); |
| } |
| |
| /** Sets the identity type for the presence credential. */ |
| @NonNull |
| public Builder setIdentityType(@IdentityType int identityType) { |
| mIdentityType = identityType; |
| return this; |
| } |
| |
| /** Adds an element to the credential. */ |
| @NonNull |
| public Builder addCredentialElement(@NonNull CredentialElement credentialElement) { |
| Objects.requireNonNull(credentialElement); |
| mCredentialElements.add(credentialElement); |
| return this; |
| } |
| |
| /** Builds the {@link PresenceCredential}. */ |
| @NonNull |
| public PublicCredential build() { |
| return new PublicCredential( |
| mIdentityType, |
| mSecretId, |
| mAuthenticityKey, |
| mCredentialElements, |
| mPublicKey, |
| mEncryptedMetadata, |
| mEncryptedMetadataKeyTag); |
| } |
| } |
| } |