nQL9igA1

1import javax.crypto.Cipher;
2import javax.crypto.SecretKey;
3import javax.crypto.spec.IvParameterSpec;
4import javax.crypto.spec.SecretKeySpec;
5import java.io.File;
6import java.io.FileInputStream;
7import java.io.FileOutputStream;
8
9public class Test {
10    private SecretKey secretKey;
11    private IvParameterSpec ivParameterSpec;
12
13    private String key = "ThisIsMyGreatKey";
14    private byte[] ivKey = "ABCDEFGHabcdefgh".getBytes();
15
16    public static void main(String[] args) {
17        try {
18            new Test().run();
19        } catch (Exception e) {
20            e.printStackTrace();
21        }
22    }
23
24    private void run() {
25        ivParameterSpec = new IvParameterSpec(ivKey);
26        secretKey = new SecretKeySpec(key.getBytes(), "AES");
27        encryptOrDecryptFile(Cipher.ENCRYPT_MODE,
28            new File("src/cactus.jpg"), new File("src/cactus-encrypted.jpg"));
29    }
30
31    private void encryptOrDecryptFile(int mode, File inputFile, File outputFile) {
32        try {
33            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
34            cipher.init(mode, secretKey, ivParameterSpec);
35
36            // Read input
37            byte[] input = new byte[(int) inputFile.length()];
38            FileInputStream inputStream = new FileInputStream(inputFile);
39            inputStream.read(input);
40
41            // Encrypt and write to output
42            byte[] output = cipher.doFinal(input);
43            FileOutputStream outputStream = new FileOutputStream(outputFile);
44            outputStream.write(output);
45
46            inputStream.close();
47            outputStream.close();
48        } catch (Exception e) {
49            e.printStackTrace();
50        }
51    }
52}
53	
54<input type="file" id="file-input" onchange="handleFile(this)">
55<button onclick="useEncryptionForFile()" id="encrypt-file">Encrypt File</button>
56<button onclick="useDecryptionForFile()" id="decrypt-file">Decrypt File</button>
57<textarea id="output"></textarea>
58<img id="example">
59
60<script>
61    let key = "ThisIsMyGreatKey";
62    let iv = "ABCDEFGHabcdefgh";
63    let useEncryption, useDecryption;
64
65    let input = document.getElementById("file-input");
66    let output = document.getElementById("output");
67    let example = document.getElementById("example");
68
69    function handleFile(element) {
70        if (element.files && element.files[0]) {
71            let file = element.files[0];
72            if (useDecryption) {
73                decryptFile(file);
74            } else {
75                encryptFile(file);
76            }
77        }
78    }
79
80    function encryptFile(file) {
81        let reader = new FileReader();
82
83        reader.onload = function (e) {
84            let encrypted = CryptoJS.AES.encrypt(e.target.result, CryptoJS.enc.Utf8.parse(key), {
85                iv: CryptoJS.enc.Utf8.parse(iv),
86                mode: CryptoJS.mode.CBC,
87                padding: CryptoJS.pad.Pkcs7
88            });
89
90            output.textContent = encrypted;
91
92            let a = document.createElement("a");
93            a.setAttribute('href', 'data:application/octet-stream,' + encrypted);
94            a.setAttribute('download', file.name + '.encrypted');
95            a.click();
96        };
97
98        reader.readAsDataURL(file);
99    }
100
101    function decryptFile(file) {
102        let reader = new FileReader();
103        reader.onload = function (e) {
104            let decrypted = CryptoJS.AES.decrypt(e.target.result, CryptoJS.enc.Utf8.parse(key), {
105                iv: CryptoJS.enc.Utf8.parse(iv),
106                mode: CryptoJS.mode.CBC,
107                padding: CryptoJS.pad.Pkcs7
108            });
109
110             // Decrypted is emtpy    
111            output.textContent = decrypted;
112
113            // Desperate try to get something working
114            example.src = "data:image/png;base64," + btoa(decrypted);
115
116            let a = document.createElement("a");
117            a.setAttribute('href', decrypted);
118            a.setAttribute('download', file.name.replace('encrypted', 'decrypted'));
119            a.click();
120        };
121
122        reader.readAsText(file);
123    }
124
125    function useEncryptionForFile() {
126        document.getElementById("encrypt-file").style.backgroundColor = "#757575";
127        document.getElementById("decrypt-file").style.backgroundColor = "#FFFFFF";
128        useEncryption = true;
129      useDecryption = false;
130    }
131
132    function useDecryptionForFile() {
133        document.getElementById("encrypt-file").style.backgroundColor = "#FFFFFF";
134        document.getElementById("decrypt-file").style.backgroundColor = "#757575";
135        useDecryption = true;
136      useEncryption = false;
137    }
138</script>
139	
140let decrypted = CryptoJS.AES.decrypt(e.target.result, CryptoJS.enc.Utf8.parse(key), {
141    iv: CryptoJS.enc.Utf8.parse(iv),
142    mode: CryptoJS.mode.CBC,
143    padding: CryptoJS.pad.Pkcs7
144});