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Encrypt, decrypt, and display an image.
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| <html> | |
| <head> | |
| <style> | |
| dd { | |
| font-family: "Lucida Console", "Courier New", monospace; | |
| } | |
| </style> | |
| <script> | |
| function readFile(file, callback) { | |
| var reader = new FileReader(); | |
| reader.addEventListener("load", function() { | |
| callback(this.result); | |
| }); | |
| reader.readAsArrayBuffer(file); | |
| } | |
| function encrypt(data) { | |
| var key, exportedKey, iv; | |
| return window.crypto.subtle.generateKey( | |
| {name: "AES-GCM", length: 256}, true, ["encrypt", "decrypt"] | |
| ).then(function(result) { | |
| key = result; | |
| return window.crypto.subtle.exportKey("jwk", key); | |
| }).then(function(result) { | |
| exportedKey = result | |
| iv = window.crypto.getRandomValues(new Uint8Array(16)) | |
| return window.crypto.subtle.encrypt( | |
| {name: "AES-GCM", iv: iv}, key, data | |
| ); | |
| }).then(function(result) { | |
| return { | |
| key: exportedKey, | |
| data: result, | |
| iv: iv, | |
| }; | |
| }); | |
| } | |
| function decrypt(exportedkey, data, iv) { | |
| return window.crypto.subtle.importKey( | |
| "jwk", exportedkey, {"name": "AES-GCM"}, false, ["encrypt", "decrypt"] | |
| ).then(function(key) { | |
| return window.crypto.subtle.decrypt( | |
| {name:"AES-GCM", iv: iv}, key, data | |
| ); | |
| }); | |
| } | |
| function displayImage(image, data) { | |
| var blob = new Blob([data]); | |
| image.src = window.URL.createObjectURL(blob); | |
| image.onload = function() { | |
| window.URL.revokeObjectURL(this.src); | |
| }; | |
| } | |
| function copyText(pos, data) { | |
| var text = new Uint8Array(data); | |
| for(var x = 0; x<24; x++) { | |
| pos.textContent += '0x'; | |
| if(text[x]<16) pos.textContent += '0'; | |
| pos.textContent += text[x].toString(16) + " "; | |
| } | |
| } | |
| document.addEventListener("DOMContentLoaded", function (event) { | |
| var file_chooser = document.getElementById("file_chooser"); | |
| var file_count = document.getElementById("file_count"); | |
| var file_name = document.getElementById("file_name"); | |
| var file_size = document.getElementById("file_size"); | |
| var file_type = document.getElementById("file_type"); | |
| var file_img = document.getElementById("file_img"); | |
| var file_enc = document.getElementById("file_enc"); | |
| var file_dec = document.getElementById("file_dec"); | |
| var image = document.getElementById("image"); | |
| file_chooser.addEventListener("change", function() { | |
| var fileList = this.files; | |
| file_count.textContent = "" + fileList.length; | |
| if (fileList.length) { | |
| file_name.textContent = fileList[0].name; | |
| file_size.textContent = fileList[0].size; | |
| file_type.textContent = fileList[0].type; | |
| readFile(fileList[0], function(data) { | |
| copyText(file_img, data); | |
| encrypt(data).then(function(result) { | |
| copyText(file_enc, result.data); | |
| return decrypt(result.key, result.data, result.iv); | |
| }).then(function(data) { | |
| copyText(file_dec, data); | |
| displayImage(image, data); | |
| }); | |
| }); | |
| } | |
| }); | |
| }); | |
| </script> | |
| </head> | |
| <body> | |
| <input id="file_chooser" type="file"></input> | |
| <dl> | |
| <dt>Count</dt><dd id="file_count"></dd> | |
| <dt>Name</dt><dd id="file_name"></dd> | |
| <dt>Size</dt><dd id="file_size"></dd> | |
| <dt>Type</dt><dd id="file_type"></dd> | |
| <dt>Image</dt><dd id="file_img"></dd> | |
| <dt>Encrypted</dt><dd id="file_enc"></dd> | |
| <dt>Decrypted</dt><dd id="file_dec"></dd> | |
| </dl> | |
| <hr></hr> | |
| <img id="image" style="height: 240px";></img> | |
| </body> | |
| </html> |
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