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-rw-r--r--helpers/peertubeCrypto.js152
1 files changed, 152 insertions, 0 deletions
diff --git a/helpers/peertubeCrypto.js b/helpers/peertubeCrypto.js
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1;(function () {
2 'use strict'
3
4 var config = require('config')
5 var crypto = require('crypto')
6 var fs = require('fs')
7 var openssl = require('openssl-wrapper')
8 var ursa = require('ursa')
9
10 var logger = require('./logger')
11
12 var certDir = __dirname + '/../' + config.get('storage.certs')
13 var algorithm = 'aes-256-ctr'
14
15 var peertubeCrypto = {
16 checkSignature: checkSignature,
17 createCertsIfNotExist: createCertsIfNotExist,
18 decrypt: decrypt,
19 encrypt: encrypt,
20 getCertDir: getCertDir,
21 sign: sign
22 }
23
24 function checkSignature (public_key, raw_data, hex_signature) {
25 var crt = ursa.createPublicKey(public_key)
26 var is_valid = crt.hashAndVerify('sha256', new Buffer(raw_data).toString('hex'), hex_signature, 'hex')
27 return is_valid
28 }
29
30 function createCertsIfNotExist (callback) {
31 certsExist(function (exist) {
32 if (exist === true) {
33 return callback(null)
34 }
35
36 createCerts(function (err) {
37 return callback(err)
38 })
39 })
40 }
41
42 function decrypt (key, data, callback) {
43 fs.readFile(getCertDir() + 'peertube.key.pem', function (err, file) {
44 if (err) return callback(err)
45
46 var my_private_key = ursa.createPrivateKey(file)
47 var decrypted_key = my_private_key.decrypt(key, 'hex', 'utf8')
48 var decrypted_data = symetricDecrypt(data, decrypted_key)
49
50 return callback(null, decrypted_data)
51 })
52 }
53
54 function encrypt (public_key, data, callback) {
55 var crt = ursa.createPublicKey(public_key)
56
57 symetricEncrypt(data, function (err, dataEncrypted) {
58 if (err) return callback(err)
59
60 var key = crt.encrypt(dataEncrypted.password, 'utf8', 'hex')
61 var encrypted = {
62 data: dataEncrypted.crypted,
63 key: key
64 }
65
66 callback(null, encrypted)
67 })
68 }
69
70 function getCertDir () {
71 return certDir
72 }
73
74 function sign (data) {
75 var myKey = ursa.createPrivateKey(fs.readFileSync(certDir + 'peertube.key.pem'))
76 var signature = myKey.hashAndSign('sha256', data, 'utf8', 'hex')
77
78 return signature
79 }
80
81 // ---------------------------------------------------------------------------
82
83 module.exports = peertubeCrypto
84
85 // ---------------------------------------------------------------------------
86
87 function certsExist (callback) {
88 fs.exists(certDir + 'peertube.key.pem', function (exists) {
89 return callback(exists)
90 })
91 }
92
93 function createCerts (callback) {
94 certsExist(function (exist) {
95 if (exist === true) {
96 var string = 'Certs already exist.'
97 logger.warning(string)
98 return callback(new Error(string))
99 }
100
101 logger.info('Generating a RSA key...')
102 openssl.exec('genrsa', { 'out': certDir + 'peertube.key.pem', '2048': false }, function (err) {
103 if (err) {
104 logger.error('Cannot create private key on this pod.', { error: err })
105 return callback(err)
106 }
107 logger.info('RSA key generated.')
108
109 logger.info('Manage public key...')
110 openssl.exec('rsa', { 'in': certDir + 'peertube.key.pem', 'pubout': true, 'out': certDir + 'peertube.pub' }, function (err) {
111 if (err) {
112 logger.error('Cannot create public key on this pod .', { error: err })
113 return callback(err)
114 }
115
116 logger.info('Public key managed.')
117 return callback(null)
118 })
119 })
120 })
121 }
122
123 function generatePassword (callback) {
124 crypto.randomBytes(32, function (err, buf) {
125 if (err) {
126 return callback(err)
127 }
128
129 callback(null, buf.toString('utf8'))
130 })
131 }
132
133 function symetricDecrypt (text, password) {
134 var decipher = crypto.createDecipher(algorithm, password)
135 var dec = decipher.update(text, 'hex', 'utf8')
136 dec += decipher.final('utf8')
137 return dec
138 }
139
140 function symetricEncrypt (text, callback) {
141 generatePassword(function (err, password) {
142 if (err) {
143 return callback(err)
144 }
145
146 var cipher = crypto.createCipher(algorithm, password)
147 var crypted = cipher.update(text, 'utf8', 'hex')
148 crypted += cipher.final('hex')
149 callback(null, { crypted: crypted, password: password })
150 })
151 }
152})()