How to encrypt and decrypt images in android?

Question

I am new to android and now i\'m building an android app to encrypt and hide the data,as part of my mini project.Could you please tell me the code to encrypt and decrypt tha ima

Answer 1

You can use the java cryptography library. Here is an example of what you can do:

byte[] keyBytes = new byte[] { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09,
    0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17 }; //Choose a key wisely

SecretKeySpec key = new SecretKeySpec(keyBytes, "AES");

Cipher cipher = Cipher.getInstance("AES/ECB/PKCS7Padding", "BC");

fis = new FileInputStream("some_img.png");
cis = new CipherInputStream(fis, cipher);
fos = new FileOutputStream("encrypted_img.enc");
byte[] b = new byte[8];
int i = cis.read(b);
while (i != -1) {
    fos.write(b, 0, i);
    i = cis.read(b);
}
fos.close();

See more at http://docs.oracle.com/javase/7/docs/technotes/guides/security/crypto/