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1let decrypted = CryptoJS.AES.decrypt(e.target.result, CryptoJS.enc.Utf8.parse(key), {
2    iv: CryptoJS.enc.Utf8.parse(iv),
3    mode: CryptoJS.mode.CBC,
4    padding: CryptoJS.pad.Pkcs7
5});
6	
7import javax.crypto.Cipher;
8import javax.crypto.SecretKey;
9import javax.crypto.spec.IvParameterSpec;
10import javax.crypto.spec.SecretKeySpec;
11import java.io.File;
12import java.io.FileInputStream;
13import java.io.FileOutputStream;
14
15public class Test {
16    private SecretKey secretKey;
17    private IvParameterSpec ivParameterSpec;
18
19    private String key = "ThisIsMyGreatKey";
20    private byte[] ivKey = "ABCDEFGHabcdefgh".getBytes();
21
22    public static void main(String[] args) {
23        try {
24            new Test().run();
25        } catch (Exception e) {
26            e.printStackTrace();
27        }
28    }
29
30    private void run() {
31        ivParameterSpec = new IvParameterSpec(ivKey);
32        secretKey = new SecretKeySpec(key.getBytes(), "AES");
33        encryptOrDecryptFile(Cipher.ENCRYPT_MODE,
34            new File("src/cactus.jpg"), new File("src/cactus-encrypted.jpg"));
35    }
36
37    private void encryptOrDecryptFile(int mode, File inputFile, File outputFile) {
38        try {
39            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
40            cipher.init(mode, secretKey, ivParameterSpec);
41
42            // Read input
43            byte[] input = new byte[(int) inputFile.length()];
44            FileInputStream inputStream = new FileInputStream(inputFile);
45            inputStream.read(input);
46
47            // Encrypt and write to output
48            byte[] output = cipher.doFinal(input);
49            FileOutputStream outputStream = new FileOutputStream(outputFile);
50            outputStream.write(output);
51
52            inputStream.close();
53            outputStream.close();
54        } catch (Exception e) {
55            e.printStackTrace();
56        }
57    }
58}
59	
60<input type="file" id="file-input" onchange="handleFile(this)">
61<button onclick="useEncryptionForFile()" id="encrypt-file">Encrypt File</button>
62<button onclick="useDecryptionForFile()" id="decrypt-file">Decrypt File</button>
63<textarea id="output"></textarea>
64<img id="example">
65
66<script>
67    let key = "ThisIsMyGreatKey";
68    let iv = "ABCDEFGHabcdefgh";
69    let useEncryption, useDecryption;
70
71    let input = document.getElementById("file-input");
72    let output = document.getElementById("output");
73    let example = document.getElementById("example");
74
75    function handleFile(element) {
76        if (element.files && element.files[0]) {
77            let file = element.files[0];
78            if (useDecryption) {
79                decryptFile(file);
80            } else {
81                encryptFile(file);
82            }
83        }
84    }
85
86    function encryptFile(file) {
87        let reader = new FileReader();
88
89        reader.onload = function (e) {
90            let encrypted = CryptoJS.AES.encrypt(e.target.result, CryptoJS.enc.Utf8.parse(key), {
91                iv: CryptoJS.enc.Utf8.parse(iv),
92                mode: CryptoJS.mode.CBC,
93                padding: CryptoJS.pad.Pkcs7
94            });
95
96            output.textContent = encrypted;
97
98            let a = document.createElement("a");
99            a.setAttribute('href', 'data:application/octet-stream,' + encrypted);
100            a.setAttribute('download', file.name + '.encrypted');
101            a.click();
102        };
103
104        reader.readAsDataURL(file);
105    }
106
107    function decryptFile(file) {
108        let reader = new FileReader();
109        reader.onload = function (e) {
110            let decrypted = CryptoJS.AES.decrypt(e.target.result, CryptoJS.enc.Utf8.parse(key), {
111                iv: CryptoJS.enc.Utf8.parse(iv),
112                mode: CryptoJS.mode.CBC,
113                padding: CryptoJS.pad.Pkcs7
114            });
115
116             // Decrypted is emtpy    
117            output.textContent = decrypted;
118
119            // Desperate try to get something working
120            example.src = "data:image/png;base64," + btoa(decrypted);
121
122            let a = document.createElement("a");
123            a.setAttribute('href', decrypted);
124            a.setAttribute('download', file.name.replace('encrypted', 'decrypted'));
125            a.click();
126        };
127
128        reader.readAsText(file);
129    }
130
131    function useEncryptionForFile() {
132        document.getElementById("encrypt-file").style.backgroundColor = "#757575";
133        document.getElementById("decrypt-file").style.backgroundColor = "#FFFFFF";
134        useEncryption = true;
135      useDecryption = false;
136    }
137
138    function useDecryptionForFile() {
139        document.getElementById("encrypt-file").style.backgroundColor = "#FFFFFF";
140        document.getElementById("decrypt-file").style.backgroundColor = "#757575";
141        useDecryption = true;
142      useEncryption = false;
143    }
144</script>
145	
146private static String encodeFileToBase64Binary(String fileName) throws IOException {
147    File file = new File(fileName);
148    byte[] encoded = Base64.encodeBase64(FileUtils.readFileToByteArray(file));
149    return new String(encoded, StandardCharsets.US_ASCII);
150}
151	
152function base64toFile(encodedstring,filename,mimeType){
153   return new File([encodedstring.arrayBuffer()],filename, {type:mimeType});
154
155}   
156
157//Usage example:
158base64toFile('aGVsbG8gd29ybGQ=', 'hello.txt', 'text/plain');