Decrypt a file

Utils.kt

@Throws(Exception::class)
fun decrypt(yourKey: SecretKey, fileData: ByteArray): ByteArray {
     val decrypted: ByteArray
     val cipher = Cipher.getInstance("AES", "BC")
     cipher.init(Cipher.DECRYPT_MODE, yourKey, IvParameterSpec(ByteArray(cipher.blockSize)))
     decrypted = cipher.doFinal(fileData)
     return decrypted
}