Split Images Into Uneven Image

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Hi, anyone knows how to split an image into pieces, using javascript? I need to encrypt and decrypt that picture into pieces so that hacker will have a problem getting the information

Posted 11-Mar-12 22:31pm

Joel Tan Wei Shan

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Ganesan Senthilvel · Accepted Answer · 2012-03-12T16:16:00

Happy to share VB .NET code to encrypt/decrypt the image. Use some tool to split an image into pieces. Image encryption code:

VB

Public Function EncryptStream(ByVal input As Byte()) As Byte()
    Dim rijn As New RijndaelManaged()
    Dim encrypted As Byte()
    Dim key As Byte() = New Byte() {&H22, &HC0, &H6D, &HCB, &H23, &HA6, _
     &H3, &H1B, &H5A, &H1D, &HD3, &H9F, _
     &H85, &HD, &HC1, &H72, &HED, &HF4, _
     &H54, &HE6, &HBA, &H65, &HC, &H22, _
     &H62, &HBE, &HF3, &HEC, &H14, &H81, _
     &HA8, &HA}
    '32
    Dim IV As Byte() = New Byte() {&H43, &HB1, &H93, &HB, &H1A, &H87, _
     &H52, &H62, &HFB, &H8, &HD, &HC0, _
     &HCA, &H40, &HC2, &HDB}
    '16
    'Get an encryptor.
    Dim encryptor As ICryptoTransform = rijn.CreateEncryptor(key, IV)

    'Encrypt the data.
    Dim msEncrypt As New MemoryStream()
    Dim csEncrypt As New CryptoStream(msEncrypt, encryptor, CryptoStreamMode.Write)


    'Write all data to the crypto stream and flush it.
    csEncrypt.Write(input, 0, input.Length)
    csEncrypt.FlushFinalBlock()

    'Get encrypted array of bytes.
    encrypted = msEncrypt.ToArray()

    Return encrypted

End Function

Decryption code:

VB

Public Function DecryptStream(ByVal input As Byte()) As Byte()
    Dim rijn As New RijndaelManaged()
    Dim decrypted As Byte()
    Dim key As Byte() = New Byte() {&H22, &HC0, &H6D, &HCB, &H23, &HA6, _
     &H3, &H1B, &H5A, &H1D, &HD3, &H9F, _
     &H85, &HD, &HC1, &H72, &HED, &HF4, _
     &H54, &HE6, &HBA, &H65, &HC, &H22, _
     &H62, &HBE, &HF3, &HEC, &H14, &H81, _
     &HA8, &HA}
    '32
    Dim IV As Byte() = New Byte() {&H43, &HB1, &H93, &HB, &H1A, &H87, _
     &H52, &H62, &HFB, &H8, &HD, &HC0, _
     &HCA, &H40, &HC2, &HDB}
    '16


    'Get a decryptor that uses the same key and IV as the encryptor.
    Dim decryptor As ICryptoTransform = rijn.CreateDecryptor(key, IV)

    'Now decrypt the previously encrypted message using the decryptor
    ' obtained in the above step.
    Dim msDecrypt As New MemoryStream(input)
    Dim csDecrypt As New CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read)

    decrypted = New Byte(input.Length - 1) {}

    'Read the data out of the crypto stream.
    csDecrypt.Read(decrypted, 0, decrypted.Length)

    Return decrypted
End Function