-
Notifications
You must be signed in to change notification settings - Fork 0
Expand file tree
/
Copy pathEncryptionHelper.js
More file actions
executable file
·227 lines (183 loc) · 5.57 KB
/
Copy pathEncryptionHelper.js
File metadata and controls
executable file
·227 lines (183 loc) · 5.57 KB
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
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
/**
* Module dependencies.
*/
var crypto = require('crypto'),
fs = require('fs');
/**
* `EncryptionHelper` Library.
* Basic library to do md5/aes256 encryption/decryption for strings or files
*
* @api public
*/
var EncryptionHelper = {
// A helper function to create a one-way md5 hash of a string
hash: function(data, encryption, outputEncoding, inputEncoding) {
encryption = encryption || 'md5';
if (!outputEncoding && outputEncoding !== null) {
outputEncoding = 'hex';
}
if (!inputEncoding && inputEncoding !== null) {
inputEncoding = 'utf8';
}
var md5 = crypto.createHash(encryption);
md5.update(data, inputEncoding);
return md5.digest(outputEncoding);
},
// A helper function to create a one-way md5 hash of a file
hashFile: function(file, algo, outputEncoding, inputEncoding, callback) {
if (inputEncoding && !callback) {
callback = inputEncoding;
inputEncoding = undefined;
}
if (outputEncoding && !callback) {
callback = outputEncoding;
outputEncoding = undefined;
}
if (algo && !callback) {
callback = algo;
algo = null;
}
algo = algo || 'md5';
if (!outputEncoding && outputEncoding !== null) {
outputEncoding = 'hex';
}
if (!inputEncoding && inputEncoding !== null) {
inputEncoding = 'utf8';
}
var hash = crypto.createHash(algo);
var fileStream = fs.createReadStream(file, {
'flags': 'r',
'encoding': inputEncoding,
'mode': 0666,
'bufferSize': 4 * 1024,
});
fileStream.on('end', function() {
var result = hash.digest(outputEncoding);
return callback(null, result);
});
fileStream.on('error', function(ex) {
return callback(ex, null);
});
fileStream.on('data', function(data) {
hash.update(data, inputEncoding);
});
return fileStream;
},
// A helper function to create a cipher from a given string.
// The cipher can be reversed and deciphered to give the orginal string.
// Default returns a hex encoded string from a utf8 and
// uses the aes256 algorithm to create the cipher.
cipher: function(key, text, algo, outputEncoding, inputEncoding) {
algo = algo || 'aes256';
if (!outputEncoding && outputEncoding !== null) {
outputEncoding = 'hex';
}
if (!inputEncoding && inputEncoding !== null) {
inputEncoding = 'utf8';
}
var cipher = crypto.createCipher(algo, key);
return cipher.update(text, inputEncoding, outputEncoding) + cipher.final(outputEncoding);
},
// A helper function to dichper a given string.
// Default returns a utf8 encoded string from a hex string and
// uses the aes256 algorithm to dechiper the given cipher.
decipher: function(key, encrypted, algo, outputEncoding, inputEncoding) {
algo = algo || 'aes256';
if (!outputEncoding && outputEncoding !== null) {
outputEncoding = 'utf8';
}
if (!inputEncoding && inputEncoding !== null) {
inputEncoding = 'hex';
}
var decipher = crypto.createDecipher(algo, key);
return decipher.update(encrypted, inputEncoding, outputEncoding) + decipher.final(outputEncoding);
},
cipherFile: function(key, file, algo, outputEncoding, inputEncoding, cb) {
if (inputEncoding && !callback) {
callback = inputEncoding;
inputEncoding = undefined;
}
if (outputEncoding && !callback) {
callback = outputEncoding;
outputEncoding = undefined;
}
if (algo && !callback) {
callback = algo;
algo = null;
}
if (!algo) {
algo = 'aes256';
}
if (!outputEncoding && outputEncoding !== null) {
outputEncoding = 'hex';
}
if (!inputEncoding && inputEncoding !== null) {
inputEncoding = 'utf8';
}
var cipher = crypto.createCipher(algo, key);
var result = '';
var fileStream = fs.createReadStream(file, {
'flags': 'r',
'encoding': inputEncoding,
'mode': 0666,
'bufferSize': 4 * 1024,
});
fileStream.on('end', function() {
result += cipher.final(outputEncoding);
return callback(null, result);
});
fileStream.on('error', function(ex) {
return callback(ex, null);
});
fileStream.on('data', function(data) {
result += cipher.update(data, inputEncoding, outputEncoding);
});
return fileStream;
},
decipherFile: function(key, file, algo, outputEncoding, inputEncoding, cb) {
if (inputEncoding && !callback) {
callback = inputEncoding;
inputEncoding = undefined;
}
if (outputEncoding && !callback) {
callback = outputEncoding;
outputEncoding = undefined;
}
if (algo && !callback) {
callback = algo;
algo = null;
}
if (!algo) {
algo = 'aes256';
}
if (!outputEncoding && outputEncoding !== null) {
outputEncoding = 'hex';
}
if (!inputEncoding && inputEncoding !== null) {
inputEncoding = 'utf8';
}
var decipher = crypto.createDecipher(algo, key);
var result = '';
var fileStream = fs.createReadStream(file, {
'flags': 'r',
'encoding': inputEncoding,
'mode': 0666,
'bufferSize': 4 * 1024,
});
fileStream.on('end', function() {
result += decipher.final(outputEncoding);
return callback(null, result);
});
fileStream.on('error', function(ex) {
return callback(ex, null);
});
fileStream.on('data', function(data) {
result += decipher.update(data, inputEncoding, outputEncoding);
});
return fileStream;
}
};
/**
* Expose `EncryptionHelper` Library.
*/
module.exports = EncryptionHelper;