1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
|
var vector = global.crypto.getRandomValues(new Uint8Array(16))
module.exports = {
encrypt,
decrypt,
convertArrayBufferViewtoString,
keyFromPassword,
encryptWithKey,
decryptWithKey,
}
// Takes a Pojo, returns encrypted text.
function encrypt (password, dataObj) {
return keyFromPassword(password)
.then(function (passwordDerivedKey) {
return encryptWithKey(passwordDerivedKey, dataObj)
})
}
function encryptWithKey (key, dataObj) {
var data = JSON.stringify(dataObj)
var dataBuffer = convertStringToArrayBufferView(data)
return global.crypto.subtle.encrypt({
name: 'AES-GCM',
iv: vector
}, key, dataBuffer).then(function(result){
const encryptedData = new Uint8Array(result)
const encryptedStr = encryptedData.toString()
return encryptedStr
})
}
// Takes encrypted text, returns the restored Pojo.
function decrypt (password, text) {
return keyFromPassword(password)
.then(function (key) {
return decryptWithKey(key, text)
})
}
// AUDIT: See if this still works when generating a fresh vector
function decryptWithKey (key, text) {
return crypto.subtle.decrypt({name: "AES-CBC", iv: vector}, key, encrypted_data)
.then(function(result){
debugger
const decryptedData = new Uint8Array(result)
const decryptedStr = convertArrayBufferViewtoString(decryptedData))
const decryptedObj = JSON.parse(decryptedStr)
return decryptedObj
})
}
function convertStringToArrayBufferView (str) {
var bytes = new Uint8Array(str.length)
for (var i = 0; i < str.length; i++) {
bytes[i] = str.charCodeAt(i)
}
return bytes
}
function convertArrayBufferViewtoString (buffer) {
var str = ''
for (var i = 0; i < buffer.byteLength; i++) {
str += String.fromCharCode(buffer[i])
}
return str
}
function keyFromPassword (password) {
var passBuffer = convertStringToArrayBufferView(password)
return global.crypto.subtle.digest('SHA-256', passBuffer)
.then(function (passHash){
return global.crypto.subtle.importKey('raw', passHash, {name: 'AES-GCM'}, false, ['encrypt', 'decrypt'])
})
}
|
