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Code Issues Releases Activity

added checksums

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This commit is contained in:
Abhinav Adduri 2017-07-10 11:25:03 -07:00
parent be470c6b6e
commit dc4682eaf5
2 changed files with 35 additions and 11 deletions
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27
frontend/src/fileReceiver.js
View File

@ -68,17 +68,38 @@ class FileReceiver extends EventEmitter {
{
name: 'AES-GCM',
iv: hexToArray(fdata.iv),
additionalData: hexToArray(fdata.aad),
tagLength: 128
additionalData: hexToArray(fdata.aad)
},
key,
fdata.data
),
new Promise((resolve, reject) => {
resolve(fdata.filename);
}),
new Promise((resolve, reject) => {
resolve(hexToArray(fdata.aad));
})
]);
});
}).then(([decrypted, fname, proposedHash]) => {
return window.crypto.subtle.digest('SHA-256', decrypted).then(calculatedHash => {
const integrity = new Uint8Array(calculatedHash).toString() === proposedHash.toString();
if (!integrity) {
return new Promise((resolve, reject) => {
console.log('This file has been tampered with.')
reject();
})
}
return Promise.all([
new Promise((resolve, reject) => {
resolve(decrypted);
}),
new Promise((resolve, reject) => {
resolve(fname);
})
]);
})
})
}
}

19
frontend/src/fileSender.js
View File

@ -8,7 +8,6 @@ class FileSender extends EventEmitter {
super();
this.file = file;
this.iv = window.crypto.getRandomValues(new Uint8Array(12));
this.aad = window.crypto.getRandomValues(new Uint8Array(6));
}
static delete(fileId, token) {
@ -54,28 +53,32 @@ class FileSender extends EventEmitter {
const reader = new FileReader();
reader.readAsArrayBuffer(this.file);
reader.onload = function(event) {
resolve(new Uint8Array(this.result));
const plaintext = new Uint8Array(this.result);
window.crypto.subtle.digest('SHA-256', plaintext).then(hash => {
resolve({plaintext: plaintext, hash: new Uint8Array(hash)});
})
};
})
])
.then(([secretKey, plaintext]) => {
.then(([secretKey, file]) => {
return Promise.all([
window.crypto.subtle
.encrypt(
{
name: 'AES-GCM',
iv: this.iv,
additionalData: this.aad,
additionalData: file.hash,
tagLength: 128
},
secretKey,
plaintext
file.plaintext
)
.catch(err => console.log('Error with encrypting.')),
window.crypto.subtle.exportKey('jwk', secretKey)
window.crypto.subtle.exportKey('jwk', secretKey),
new Promise((resolve, reject) => { resolve(file.hash) })
]);
})
.then(([encrypted, keydata]) => {
.then(([encrypted, keydata, hash]) => {
return new Promise((resolve, reject) => {
const file = this.file;
const fileId = arrayToHex(this.iv);
@ -110,7 +113,7 @@ class FileSender extends EventEmitter {
xhr.setRequestHeader(
'X-File-Metadata',
JSON.stringify({
aad: arrayToHex(this.aad),
aad: arrayToHex(hash),
iv: fileId,
filename: file.name
})