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Encrypt your Media in a secure folder only accessible by your credentials The vaults and media and their info are completely encrypted and stored in the app's private folder. The encryption is a standard AES256_GCM scheme, but customisable options are on their way (with option to backup/restore the vault) Fixes Ability to hide photos/videos in a hidden folder within the app #232 Fixes Hidden folders[Enhancement] #402 Signed-off-by: IacobIonut01 <[email protected]>
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97
app/src/main/kotlin/com/dot/gallery/feature_node/data/data_source/KeychainHolder.kt
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,97 @@ | ||
| package com.dot.gallery.feature_node.data.data_source | ||
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| import android.content.Context | ||
| import android.net.Uri | ||
| import android.security.keystore.UserNotAuthenticatedException | ||
| import androidx.security.crypto.EncryptedFile | ||
| import androidx.security.crypto.EncryptedFile.FileEncryptionScheme.AES256_GCM_HKDF_4KB | ||
| import androidx.security.crypto.MasterKey | ||
| import com.dot.gallery.feature_node.domain.model.Vault | ||
| import com.dot.gallery.feature_node.domain.model.fromByteArray | ||
| import com.dot.gallery.feature_node.domain.model.toByteArray | ||
| import dagger.hilt.android.qualifiers.ApplicationContext | ||
| import java.io.ByteArrayOutputStream | ||
| import java.io.File | ||
| import java.io.FileNotFoundException | ||
| import java.io.IOException | ||
| import java.io.Serializable | ||
| import java.security.GeneralSecurityException | ||
| import javax.inject.Inject | ||
|
|
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| class KeychainHolder @Inject constructor( | ||
| @ApplicationContext private val context: Context | ||
| ) { | ||
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| val filesDir: File = context.filesDir | ||
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| fun vaultFolder(vault: Vault) = File(filesDir, vault.uuid.toString()) | ||
| fun vaultInfoFile(vault: Vault) = File(vaultFolder(vault), VAULT_INFO_FILE_NAME) | ||
| fun Vault.mediaFile(mediaId: Long) = File(vaultFolder(this), "$mediaId.enc") | ||
|
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| private val masterKey: MasterKey = MasterKey.Builder(context) | ||
| .setKeyScheme(MasterKey.KeyScheme.AES256_GCM) | ||
| .build() | ||
|
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| fun writeVaultInfo(vault: Vault, onSuccess: () -> Unit = {}) { | ||
| val vaultFolder = File(filesDir, vault.uuid.toString()) | ||
| if (!vaultFolder.exists()) { | ||
| vaultFolder.mkdir() | ||
| } | ||
|
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| File(vaultFolder, VAULT_INFO_FILE_NAME).apply { | ||
| if (exists()) delete() | ||
| encrypt(vault) | ||
| } | ||
| onSuccess() | ||
| } | ||
|
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| fun checkVaultFolder(vault: Vault) { | ||
| val mainFolder = File(filesDir, vault.uuid.toString()) | ||
| if (!mainFolder.exists()) { | ||
| mainFolder.mkdir() | ||
| writeVaultInfo(vault) | ||
| } | ||
| } | ||
|
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| @Throws(GeneralSecurityException::class, IOException::class, FileNotFoundException::class, UserNotAuthenticatedException::class) | ||
| fun <T : Serializable> File.decrypt(): T = EncryptedFile.Builder( | ||
| context, | ||
| this, | ||
| masterKey, | ||
| AES256_GCM_HKDF_4KB | ||
| ).build().openFileInput().use { | ||
| fromByteArray(it.readBytes()) | ||
| } | ||
|
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| @Throws(GeneralSecurityException::class, IOException::class, FileNotFoundException::class, UserNotAuthenticatedException::class) | ||
| fun <T : Serializable> File.encrypt(data: T) { | ||
| EncryptedFile.Builder( | ||
| context, | ||
| this, | ||
| masterKey, | ||
| AES256_GCM_HKDF_4KB | ||
| ).build().openFileOutput().use { | ||
| it.write(data.toByteArray()) | ||
| } | ||
| } | ||
|
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| @Throws(IOException::class) | ||
| fun getBytes(uri: Uri): ByteArray? = | ||
| context.contentResolver.openInputStream(uri)?.use { inputStream -> | ||
| val byteBuffer = ByteArrayOutputStream() | ||
| val bufferSize = 1024 | ||
| val buffer = ByteArray(bufferSize) | ||
|
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| var len: Int | ||
| while (inputStream.read(buffer).also { len = it } != -1) { | ||
| byteBuffer.write(buffer, 0, len) | ||
| } | ||
| byteBuffer.toByteArray() | ||
| } | ||
|
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| companion object { | ||
| const val VAULT_INFO_FILE_NAME = "info.vault" | ||
| const val VAULT_INFO_FILE = "/$VAULT_INFO_FILE_NAME" | ||
| } | ||
| } |
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