Android Question Read a big file an encrypt this using RandomAccessFile(RAF)

Hi Guys
i want to make a file encrypter ...
normally for larg files i get OutOfMemory error ...

how i can use RAF for this work ?

My test Read file and Encryptions functions:
Sub ReadFile(Dir As String, flname As String) As Byte()
    Dim out As OutputStream
    out.InitializeToBytesArray(100) 'size not really important
    File.Copy2(File.OpenInput(Dir, flname), out)
    Return out.ToBytesArray
End Sub

Sub AES_Encrypt(input() As Byte, IV As String, pass As String)
    Dim passB() As Byte = pass.GetBytes("UTF8")
    Dim IVb() As Byte = IV.GetBytes("UTF8")
    Dim  su As StringUtils
    Dim kg As KeyGenerator
    Dim C As Cipher
    C.InitialisationVector = IVb
    Dim datas() As Byte = C.Encrypt(input, kg.Key, True) ' OutPut Is a Encrypted Aes Byte...

    File.WriteBytes(File.DirRootExternal,"encrypted.jpg",datas)' Save Encrypted File
End Sub

Sub GenerateIV As String
    Dim PWC As String = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890"
    Dim IV As String
    For i=0 To 15
        IV=IV & PWC.CharAt(Rnd(0,PWC.Length))
    Return IV
End Sub

'I Use This :
Dim Pass As String = "12345678901234567890123456789012" ' 32
Dim iv As String = GenerateIV

how i can use this codes by "RAF" for solve my 'OutOfMemory' Problem ?!

Thank All


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