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fix: Wrap internal Android encryption exception #343

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merged 3 commits into from
Sep 27, 2023
Merged

fix: Wrap internal Android encryption exception #343

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a788d74
fix: Wrap internal Android encryption exception
sdsantos Sep 26, 2023
1cd6b3b
Make EncryptionInitializationException public. Fix test coverage.
sdsantos Sep 27, 2023
11a7a52
Merge branch 'main' into wrap-encryption-exception
kodiakhq[bot] Sep 27, 2023
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24 changes: 18 additions & 6 deletions lib/src/main/java/tech/relaycorp/awaladroid/AndroidPrivateKeyStore.kt
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Original file line number Diff line number Diff line change
Expand Up @@ -6,29 +6,41 @@ import androidx.security.crypto.MasterKey
import tech.relaycorp.awala.keystores.file.FileKeystoreRoot
import tech.relaycorp.awala.keystores.file.FilePrivateKeyStore
import java.io.File
import javax.crypto.AEADBadTagException

internal class AndroidPrivateKeyStore(
root: FileKeystoreRoot,
private val context: Context,
) : FilePrivateKeyStore(root) {

@Throws(EncryptionInitializationException::class)
override fun makeEncryptedInputStream(file: File) = buildEncryptedFile(file).openFileInput()

@Throws(EncryptionInitializationException::class)
override fun makeEncryptedOutputStream(file: File) = buildEncryptedFile(file).openFileOutput()

@Throws(EncryptionInitializationException::class)
private fun buildEncryptedFile(file: File) =
EncryptedFile.Builder(
context,
file,
masterKey,
EncryptedFile.FileEncryptionScheme.AES256_GCM_HKDF_4KB,
).build()
try {
EncryptedFile.Builder(
context,
file,
masterKey,
EncryptedFile.FileEncryptionScheme.AES256_GCM_HKDF_4KB,
).build()
} catch (e: AEADBadTagException) {
// Known issue: https://issuetracker.google.com/issues/164901843
throw EncryptionInitializationException(e)
}

private val masterKey by lazy {
MasterKey.Builder(context, MASTER_KEY_ALIAS)
.setKeyScheme(MasterKey.KeyScheme.AES256_GCM)
.build()
}

class EncryptionInitializationException(cause: Throwable) : Exception(cause)
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companion object {
private const val MASTER_KEY_ALIAS = "_awaladroid_master_key_"
}
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