gcm encryption

frontend/src/fileReceiver.js

@@ -54,23 +54,23 @@ class FileReceiver extends EventEmitter {
         {
           kty: 'oct',
           k: location.hash.slice(1),
-          alg: 'A128CBC',
+          alg: 'A256GCM',
           ext: true
         },
         {
-          name: 'AES-CBC'
+          name: 'AES-GCM'
         },
         true,
         ['encrypt', 'decrypt']
       )
-    ])
-      .then(([fdata, key]) => {
+    ]).then(([fdata, key]) => {
       const salt = this.salt;
       return Promise.all([
         window.crypto.subtle.decrypt(
           {
-              name: 'AES-CBC',
-              iv: salt
+            name: 'AES-GCM',
+            iv: salt,
+            tagLength: 128
           },
           key,
           fdata.data
@@ -79,10 +79,6 @@ class FileReceiver extends EventEmitter {
           resolve(fdata.fname);
         })
       ]);
-      })
-      .catch(err => {
-        Raven.captureException(err);
-        return Promise.reject(err);
     });
   }
 }

frontend/src/fileSender.js

@@ -7,7 +7,7 @@ class FileSender extends EventEmitter {
   constructor(file) {
     super();
     this.file = file;
-    this.iv = window.crypto.getRandomValues(new Uint8Array(16));
+    this.iv = window.crypto.getRandomValues(new Uint8Array(12));
   }
 
   static delete(fileId, token) {
@@ -39,12 +39,13 @@ class FileSender extends EventEmitter {
     return Promise.all([
       window.crypto.subtle.generateKey(
         {
-          name: 'AES-CBC',
-          length: 128
+          name: 'AES-GCM',
+          length: 256,
+          tagLength: 128
         },
         true,
         ['encrypt', 'decrypt']
-      ),
+      ).catch(err => console.log('There was an error generating a crypto key')),
       new Promise((resolve, reject) => {
         const reader = new FileReader();
         reader.readAsArrayBuffer(this.file);
@@ -57,12 +58,13 @@ class FileSender extends EventEmitter {
         return Promise.all([
           window.crypto.subtle.encrypt(
             {
-              name: 'AES-CBC',
-              iv: this.iv
+              name: 'AES-GCM',
+              iv: this.iv,
+              tagLength: 128
             },
             secretKey,
             plaintext
-          ),
+          ).catch(err => console.log('Error with encrypting.')),
           window.crypto.subtle.exportKey('jwk', secretKey)
         ]);
       })

frontend/src/utils.js

@@ -12,7 +12,7 @@ function ivToStr(iv) {
 }
 
 function strToIv(str) {
-  const iv = new Uint8Array(16);
+  const iv = new Uint8Array(12);
   for (let i = 0; i < str.length; i += 2) {
     iv[i / 2] = parseInt(str.charAt(i) + str.charAt(i + 1), 16);
   }

server/portal_server.js

@@ -171,5 +171,5 @@ app.listen(conf.listen_port, () => {
 });
 
 const validateID = route_id => {
-  return route_id.match(/^[0-9a-fA-F]{32}$/) !== null;
+  return route_id.match(/^[0-9a-fA-F]{24}$/) !== null;
 };