z8QLCntE

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
66    function encrypt(text) {
67        let encrypted = CryptoJS.AES.encrypt(text, CryptoJS.enc.Utf8.parse(key), {
68            iv: CryptoJS.enc.Utf8.parse(iv),
69            mode: CryptoJS.mode.CBC,
70            padding: CryptoJS.pad.Pkcs7
71        });
72
73        return encrypted.ciphertext.toString(CryptoJS.enc.Base64);
74    }
75
76    function decrypt(encrypted) {
77        let decrypted = CryptoJS.AES.decrypt(encrypted, CryptoJS.enc.Utf8.parse(key), {
78            iv: CryptoJS.enc.Utf8.parse(iv),
79            mode: CryptoJS.mode.CBC,
80            padding: CryptoJS.pad.Pkcs7
81        });
82
83        // Should be Latin1 for files?
84        return decrypted.toString(CryptoJS.enc.Utf8);
85    }
86
87    let input = document.getElementById("file-input");
88    let output = document.getElementById("output");
89    let example = document.getElementById("example");
90
91    function handleFile(element) {
92        if (element.files && element.files[0]) {
93            let file = element.files[0];
94        if (useDecryption) {
95            decryptFile(file);
96        } else {
97            encryptFile(file);
98        }
99        }
100    }
101
102    function encryptFile(file) {
103        let reader = new FileReader();
104
105        reader.onload = function (e) {
106            let encrypted = CryptoJS.AES.encrypt(e.target.result, CryptoJS.enc.Utf8.parse(key), {
107                iv: CryptoJS.enc.Utf8.parse(iv),
108                mode: CryptoJS.mode.CBC,
109                padding: CryptoJS.pad.Pkcs7
110            });
111
112        output.textContent = encrypted;
113
114            let a = document.createElement("a");
115            a.setAttribute('href', 'data:application/octet-stream,' + encrypted);
116            a.setAttribute('download', file.name + '.encrypted');
117            a.click();
118        };
119
120        reader.readAsDataURL(file);
121    }
122
123    function decryptFile(file) {
124        let reader = new FileReader();
125        reader.onload = function (e) {
126            let decrypted = CryptoJS.AES.decrypt(e.target.result, CryptoJS.enc.Utf8.parse(key), {
127                iv: CryptoJS.enc.Utf8.parse(iv),
128                mode: CryptoJS.mode.CBC,
129                padding: CryptoJS.pad.Pkcs7
130            }).toString(CryptoJS.enc.Latin1);
131
132        output.textContent = decrypted;
133
134            if (!/^data:/.test(decrypted)) {
135                alert("Failed to decrypt file");
136                return false;
137            }
138
139            let a = document.createElement("a");
140            a.setAttribute('href', decrypted);
141            a.setAttribute('download', file.name.replace('.encrypted', ''));
142            a.click();
143        };
144
145        reader.readAsText(file);
146    }
147
148    function useEncryptionForFile() {
149        document.getElementById("encrypt-file").style.backgroundColor = "#757575";
150        document.getElementById("decrypt-file").style.backgroundColor = "#FFFFFF";
151        useEncryption = true;
152      useDecryption = false;
153    }
154
155    function useDecryptionForFile() {
156        document.getElementById("encrypt-file").style.backgroundColor = "#FFFFFF";
157        document.getElementById("decrypt-file").style.backgroundColor = "#757575";
158        useDecryption = true;
159      useEncryption = false;
160    }
161</script>