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steganography_test.go
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steganography_test.go
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package steganography
import (
"bufio"
"bytes"
"image"
"image/color"
"image/jpeg"
"log"
"os"
"testing"
)
var rawInputFilePng = "./examples/stegosaurus.png"
var rawInputFileJpg = "./examples/stegosaurus.jpg"
var encodedInputFilePng = "./examples/encoded_stegosaurus.png"
var encodedInputFileJpg = "./examples/encoded_stegosaurus.jpg"
var bitmessage = []uint8{84, 104, 101, 113, 117, 97, 100, 114, 117, 112, 101, 100, 97, 108, 83, 116, 101, 103, 111, 115, 97, 117, 114, 117, 115, 105, 115, 111, 110, 101, 111, 102, 116, 104, 101, 109, 111, 115, 116, 101, 97, 115, 105, 108, 121, 105, 100, 101, 110, 116, 105, 102, 105, 97, 98, 108, 101, 100, 105, 110, 111, 115, 97, 117, 114, 103, 101, 110, 101, 114, 97, 44, 100, 117, 101, 116, 111, 116, 104, 101, 100, 105, 115, 116, 105, 110, 99, 116, 105, 118, 101, 100, 111, 117, 98, 108, 101, 114, 111, 119, 111, 102, 107, 105, 116, 101, 45, 115, 104, 97, 112, 101, 100, 112, 108, 97, 116, 101, 115, 114, 105, 115, 105, 110, 103, 118, 101, 114, 116, 105, 99, 97, 108, 108, 121, 97, 108, 111, 110, 103, 116, 104, 101, 114, 111, 117, 110, 100, 101, 100, 98, 97, 99, 107, 97, 110, 100, 116, 104, 101, 116, 119, 111, 112, 97, 105, 114, 115, 111, 102, 108, 111, 110, 103, 115, 112, 105, 107, 101, 115, 101, 120, 116, 101, 110, 100, 105, 110, 103, 104, 111, 114, 105, 122, 111, 110, 116, 97, 108, 108, 121, 110, 101, 97, 114, 116, 104, 101, 101, 110, 100, 111, 102, 116, 104, 101, 116, 97, 105, 108, 46, 65, 108, 116, 104, 111, 117, 103, 104, 108, 97, 114, 103, 101, 105, 110, 100, 105, 118, 105, 100, 117, 97, 108, 115, 99, 111, 117, 108, 100, 103, 114, 111, 119, 117, 112, 116, 111, 57, 109, 40, 50, 57, 46, 53, 102, 116, 41, 105, 110, 108, 101, 110, 103, 116, 104, 91, 52, 93, 97, 110, 100, 53, 46, 51, 116, 111, 55, 109, 101, 116, 114, 105, 99, 116, 111, 110, 115, 40, 53, 46, 56, 116, 111, 55, 46, 55, 115, 104, 111, 114, 116, 116, 111, 110, 115, 41, 105, 110, 119, 101, 105, 103, 104, 116, 44, 91, 53, 93, 91, 54, 93, 116, 104, 101, 118, 97, 114, 105, 111, 117, 115, 115, 112, 101, 99, 105, 101, 115, 111, 102, 83, 116, 101, 103, 111, 115, 97, 117, 114, 117, 115, 119, 101, 114, 101, 100, 119, 97, 114, 102, 101, 100, 98, 121, 99, 111, 110, 116, 101, 109, 112, 111, 114, 97, 114, 105, 101, 115, 44, 116, 104, 101, 103, 105, 97, 110, 116, 115, 97, 117, 114, 111, 112, 111, 100, 115, 46, 83, 111, 109, 101, 102, 111, 114, 109, 111, 102, 97, 114, 109, 111, 114, 97, 112, 112, 101, 97, 114, 115, 116, 111, 104, 97, 118, 101, 98, 101, 101, 110, 110, 101, 99, 101, 115, 115, 97, 114, 121, 44, 97, 115, 83, 116, 101, 103, 111, 115, 97, 117, 114, 117, 115, 115, 112, 101, 99, 105, 101, 115, 99, 111, 101, 120, 105, 115, 116, 101, 100, 119, 105, 116, 104, 108, 97, 114, 103, 101, 112, 114, 101, 100, 97, 116, 111, 114, 121, 116, 104, 101, 114, 111, 112, 111, 100, 100, 105, 110, 111, 115, 97, 117, 114, 115, 44, 115, 117, 99, 104, 97, 115, 65, 108, 108, 111, 115, 97, 117, 114, 117, 115, 97, 110, 100, 67, 101, 114, 97, 116, 111, 115, 97, 117, 114, 117, 115, 46}
func TestEncodeFromPngFile(t *testing.T) {
inFile, err := os.Open(rawInputFilePng)
if err != nil {
log.Printf("Error opening file %s: %v", rawInputFilePng, err)
t.FailNow()
}
defer inFile.Close()
reader := bufio.NewReader(inFile)
img, _, err := image.Decode(reader)
if err != nil {
log.Printf("Error decoding. %v", err)
t.FailNow()
}
w := new(bytes.Buffer)
err = Encode(w, img, bitmessage) // Encode the message into the image file
if err != nil {
log.Printf("Error Encoding file %v", err)
t.FailNow()
}
outFile, err := os.Create(encodedInputFilePng)
if err != nil {
log.Printf("Error creating file %s: %v", encodedInputFilePng, err)
t.FailNow()
}
w.WriteTo(outFile)
defer outFile.Close()
}
func TestEncodeFromJpgFile(t *testing.T) {
inFile, err := os.Open(rawInputFileJpg)
if err != nil {
log.Printf("Error opening file %s: %v", rawInputFileJpg, err)
t.FailNow()
}
defer inFile.Close()
reader := bufio.NewReader(inFile)
img, err := jpeg.Decode(reader)
if err != nil {
log.Printf("Error decoding. %v", err)
t.FailNow()
}
w := new(bytes.Buffer)
err = Encode(w, img, bitmessage) // Encode the message into the image file
if err != nil {
log.Printf("Error Encoding file %v", err)
t.FailNow()
}
outFile, err := os.Create(encodedInputFileJpg)
if err != nil {
log.Printf("Error creating file %s: %v", encodedInputFileJpg, err)
t.FailNow()
}
w.WriteTo(outFile)
defer outFile.Close()
}
func TestDecodeFromPngFile(t *testing.T) {
inFile, err := os.Open(encodedInputFilePng)
if err != nil {
log.Printf("Error opening file %s: %v", encodedInputFilePng, err)
t.FailNow()
}
defer inFile.Close()
reader := bufio.NewReader(inFile)
img, _, err := image.Decode(reader)
if err != nil {
log.Print("Error decoding file")
t.FailNow()
}
sizeOfMessage := GetMessageSizeFromImage(img)
msg := Decode(sizeOfMessage, img) // Read the message from the picture file
if !bytes.Equal(msg, bitmessage) {
log.Println(string(msg))
log.Print("messages dont match")
t.FailNow()
}
}
func TestDecodeFromJpgFile(t *testing.T) {
inFile, err := os.Open(encodedInputFileJpg)
if err != nil {
log.Printf("Error opening file %s: %v", encodedInputFileJpg, err)
t.FailNow()
}
defer inFile.Close()
reader := bufio.NewReader(inFile)
img, _, err := image.Decode(reader)
if err != nil {
log.Print("Error decoding file")
t.FailNow()
}
sizeOfMessage := GetMessageSizeFromImage(img)
msg := Decode(sizeOfMessage, img) // Read the message from the picture file
if !bytes.Equal(msg, bitmessage) {
log.Println(string(msg))
log.Print("messages dont match")
t.FailNow()
}
}
func TestEncodeDecodeGeneratedSmallImage(t *testing.T) {
// Creating image
width := 30
height := 1
upLeft := image.Point{0, 0}
lowRight := image.Point{width, height}
newimg := image.NewNRGBA(image.Rectangle{upLeft, lowRight})
// Set color for each pixel.
for x := 0; x < width; x++ {
for y := 0; y < height; y++ {
newimg.Set(x, y, color.White)
}
}
w := new(bytes.Buffer)
err := EncodeNRGBA(w, newimg, []uint8{84, 84, 84}) // Encode the message into the image file
if err != nil {
log.Printf("Error Encoding file %v", err)
t.FailNow()
}
decodeImg, _, err := image.Decode(w)
if err != nil {
log.Println("Failed to Decode Image")
t.FailNow()
}
sizeOfMessage := GetMessageSizeFromImage(decodeImg)
msg := Decode(sizeOfMessage, decodeImg) // Read the message from the picture file
// otherwise, print the message to STDOUT
if !bytes.Equal(msg, []uint8{84, 84, 84}) {
log.Println(string(msg))
log.Print("messages dont match")
t.FailNow()
}
}
func TestSmalImage(t *testing.T) {
miniImage := image.Image(image.NewNRGBA(image.Rectangle{image.Point{0, 0}, image.Point{18, 1}}))
log.Print(MaxEncodeSize(miniImage))
if MaxEncodeSize(miniImage) > 0 {
log.Printf("Uncaught small image size")
t.FailNow()
}
miniImage = image.Image(image.NewNRGBA(image.Rectangle{image.Point{0, 0}, image.Point{23, 1}}))
if MaxEncodeSize(miniImage) != 4 {
log.Printf("Uncaught minimal image size")
t.FailNow()
}
}
func TestMessageTooLarge(t *testing.T) {
miniImage := image.Image(image.NewNRGBA(image.Rectangle{image.Point{0, 0}, image.Point{24, 1}}))
w := new(bytes.Buffer)
err := Encode(w, miniImage, bitmessage) // Encode the message into the image file
if err == nil {
log.Printf("Uncaught error: message too large for image")
t.FailNow()
}
}