Code for the article: "Protecting secrets in an Android project"

EncryptionEngine.kt

fun decrypt(encryptedData: ByteArray): String? {
  val encryptionKey = generateKey()
  val cell = SecureCell(encryptionKey, SecureCell.MODE_SEAL)
  return try {
    val cellData = SecureCellData(encryptedData, null)
    val decodedData = cell.unprotect(encryptionContext, cellData)
    String(decodedData)
  } catch (error: SecureCellException) {
    Log.e("EncryptionEngine", "Failed to decrypt message, error)
    null
  }
}