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Remove unused backup outputstream class.

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This commit is contained in:
Greyson Parrelli
2024-04-19 13:41:15 -04:00
committed by Cody Henthorne
parent 690a68f0d0
commit 04fb459acd
1 changed files with 0 additions and 75 deletions
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75
app/src/main/java/org/thoughtcrime/securesms/backup/v2/stream/BackupEncryptedOutputStream.kt
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@@ -1,75 +0,0 @@
/*
* Copyright 2023 Signal Messenger, LLC
* SPDX-License-Identifier: AGPL-3.0-only
*/
package org.thoughtcrime.securesms.backup.v2.stream
import org.signal.libsignal.protocol.kdf.HKDF
import java.io.FilterOutputStream
import java.io.OutputStream
import javax.crypto.Cipher
import javax.crypto.Mac
import javax.crypto.spec.IvParameterSpec
import javax.crypto.spec.SecretKeySpec
class BackupEncryptedOutputStream(key: ByteArray, backupId: ByteArray, wrapped: OutputStream) : FilterOutputStream(wrapped) {
val cipher: Cipher = Cipher.getInstance("AES/CBC/PKCS5Padding")
val mac: Mac = Mac.getInstance("HmacSHA256")
var finalMac: ByteArray? = null
init {
if (key.size != 32) {
throw IllegalArgumentException("Key must be 32 bytes!")
}
if (backupId.size != 16) {
throw IllegalArgumentException("BackupId must be 32 bytes!")
}
val extendedKey = HKDF.deriveSecrets(key, backupId, "20231003_Signal_Backups_EncryptMessageBackup".toByteArray(), 80)
val macKey = extendedKey.copyOfRange(0, 32)
val cipherKey = extendedKey.copyOfRange(32, 64)
val iv = extendedKey.copyOfRange(64, 80)
cipher.init(Cipher.ENCRYPT_MODE, SecretKeySpec(cipherKey, "AES"), IvParameterSpec(iv))
mac.init(SecretKeySpec(macKey, "HmacSHA256"))
}
override fun write(b: Int) {
throw UnsupportedOperationException()
}
override fun write(data: ByteArray) {
write(data, 0, data.size)
}
override fun write(data: ByteArray, off: Int, len: Int) {
cipher.update(data, off, len)?.let { ciphertext ->
mac.update(ciphertext)
super.write(ciphertext)
}
}
override fun flush() {
cipher.doFinal()?.let { ciphertext ->
mac.update(ciphertext)
super.write(ciphertext)
}
finalMac = mac.doFinal()
super.flush()
}
override fun close() {
flush()
super.close()
}
fun getMac(): ByteArray {
return finalMac ?: throw IllegalStateException("Mac not yet available! You must call flush() before asking for the mac.")
}
}