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1 | 'use strict' | |
2 | ||
3 | var config = require('config') | |
4 | var crypto = require('crypto') | |
5 | var fs = require('fs') | |
6 | var openssl = require('openssl-wrapper') | |
7 | var path = require('path') | |
8 | var ursa = require('ursa') | |
9 | ||
10 | var logger = require('./logger') | |
11 | ||
12 | var certDir = path.join(__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.') | |
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.') | |
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) return callback(err) | |
126 | ||
127 | callback(null, buf.toString('utf8')) | |
128 | }) | |
129 | } | |
130 | ||
131 | function symetricDecrypt (text, password) { | |
132 | var decipher = crypto.createDecipher(algorithm, password) | |
133 | var dec = decipher.update(text, 'hex', 'utf8') | |
134 | dec += decipher.final('utf8') | |
135 | return dec | |
136 | } | |
137 | ||
138 | function symetricEncrypt (text, callback) { | |
139 | generatePassword(function (err, password) { | |
140 | if (err) return callback(err) | |
141 | ||
142 | var cipher = crypto.createCipher(algorithm, password) | |
143 | var crypted = cipher.update(text, 'utf8', 'hex') | |
144 | crypted += cipher.final('hex') | |
145 | callback(null, { crypted: crypted, password: password }) | |
146 | }) | |
147 | } |