Merge pull request #470 from mozilla/remove-hash

removed the file sha256 hash

frontend/src/download.js

@@ -41,10 +41,6 @@ function download() {
     document.l10n.formatValue('decryptingFile').then(progress.setText);
   });
 
-  fileReceiver.on('hashing', () => {
-    document.l10n.formatValue('verifyingFile').then(progress.setText);
-  });
-
   fileReceiver
     .download()
     .catch(err => {

frontend/src/fileReceiver.js

@@ -45,7 +45,6 @@ class FileReceiver extends EventEmitter {
               resolve([
                 {
                   data: this.result,
-                  aad: meta.aad,
                   filename: meta.filename,
                   iv: meta.id
                 },
@@ -69,7 +68,6 @@ class FileReceiver extends EventEmitter {
               {
                 name: 'AES-GCM',
                 iv: hexToArray(fdata.iv),
-                additionalData: hexToArray(fdata.aad),
                 tagLength: 128
               },
               key,
@@ -78,26 +76,8 @@ class FileReceiver extends EventEmitter {
             .then(decrypted => {
               return Promise.resolve(decrypted);
             }),
-          fdata.filename,
-          hexToArray(fdata.aad)
+          decodeURIComponent(fdata.filename)
         ]);
-      })
-      .then(([decrypted, fname, proposedHash]) => {
-        this.emit('hashing');
-        return window.crypto.subtle
-          .digest('SHA-256', decrypted)
-          .then(calculatedHash => {
-            const integrity =
-              new Uint8Array(calculatedHash).toString() ===
-              proposedHash.toString();
-            if (!integrity) {
-              this.emit('unsafe', true);
-              return Promise.reject();
-            } else {
-              this.emit('safe', true);
-              return Promise.all([decrypted, decodeURIComponent(fname)]);
-            }
-          });
       });
   }
 }

frontend/src/fileSender.js

@@ -48,37 +48,30 @@ class FileSender extends EventEmitter {
         const reader = new FileReader();
         reader.readAsArrayBuffer(this.file);
         reader.onload = function(event) {
-          self.emit('hashing');
           const plaintext = new Uint8Array(this.result);
-          window.crypto.subtle.digest('SHA-256', plaintext).then(hash => {
-            self.emit('encrypting');
-            resolve({ plaintext: plaintext, hash: new Uint8Array(hash) });
-          });
+          resolve(plaintext);
         };
         reader.onerror = function(err) {
           reject(err);
         };
       })
     ])
-      .then(([secretKey, file]) => {
+      .then(([secretKey, plaintext]) => {
+        self.emit('encrypting');
         return Promise.all([
           window.crypto.subtle.encrypt(
             {
               name: 'AES-GCM',
               iv: this.iv,
-              additionalData: file.hash,
               tagLength: 128
             },
             secretKey,
-            file.plaintext
+            plaintext
           ),
-          window.crypto.subtle.exportKey('jwk', secretKey),
-          new Promise((resolve, reject) => {
-            resolve(file.hash);
-          })
+          window.crypto.subtle.exportKey('jwk', secretKey)
         ]);
       })
-      .then(([encrypted, keydata, hash]) => {
+      .then(([encrypted, keydata]) => {
         return new Promise((resolve, reject) => {
           const file = this.file;
           const fileId = arrayToHex(this.iv);
@@ -114,7 +107,6 @@ class FileSender extends EventEmitter {
           xhr.setRequestHeader(
             'X-File-Metadata',
             JSON.stringify({
-              aad: arrayToHex(hash),
               id: fileId,
               filename: encodeURIComponent(file.name)
             })

frontend/src/upload.js

@@ -169,10 +169,6 @@ $(() => {
           });
         });
 
-        fileSender.on('hashing', () => {
-          document.l10n.formatValue('verifyingFile').then(progress.setText);
-        });
-
         fileSender.on('encrypting', () => {
           document.l10n.formatValue('encryptingFile').then(progress.setText);
         });

server/server.js

@@ -225,7 +225,6 @@ app.post('/upload', (req, res, next) => {
   }
 
   if (
-    !meta.hasOwnProperty('aad') ||
     !meta.hasOwnProperty('id') ||
     !meta.hasOwnProperty('filename') ||
     !validateIV(meta.id)