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
|
// Copyright 2008 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Namespace with crypto related helper functions.
*/
goog.provide('goog.crypt');
goog.require('goog.array');
/**
* Turns a string into an array of bytes; a "byte" being a JS number in the
* range 0-255.
* @param {string} str String value to arrify.
* @return {Array.<number>} Array of numbers corresponding to the
* UCS character codes of each character in str.
*/
goog.crypt.stringToByteArray = function(str) {
var output = [], p = 0;
for (var i = 0; i < str.length; i++) {
var c = str.charCodeAt(i);
while (c > 0xff) {
output[p++] = c & 0xff;
c >>= 8;
}
output[p++] = c;
}
return output;
};
/**
* Turns an array of numbers into the string given by the concatenation of the
* characters to which the numbers correspond.
* @param {Array} array Array of numbers representing characters.
* @return {string} Stringification of the array.
*/
goog.crypt.byteArrayToString = function(array) {
return String.fromCharCode.apply(null, array);
};
/**
* Turns an array of numbers into the hex string given by the concatenation of
* the hex values to which the numbers correspond.
* @param {Array} array Array of numbers representing characters.
* @return {string} Hex string.
*/
goog.crypt.byteArrayToHex = function(array) {
return goog.array.map(array, function(numByte) {
var hexByte = numByte.toString(16);
return hexByte.length > 1 ? hexByte : '0' + hexByte;
}).join('');
};
/**
* Converts a hex string into an integer array.
* @param {string} hexString Hex string of 16-bit integers (two characters
* per integer).
* @return {!Array.<number>} Array of {0,255} integers for the given string.
*/
goog.crypt.hexToByteArray = function(hexString) {
goog.asserts.assert(hexString.length % 2 == 0,
'Key string length must be multiple of 2');
var arr = [];
for (var i = 0; i < hexString.length; i += 2) {
arr.push(parseInt(hexString.substring(i, i + 2), 16));
}
return arr;
};
/**
* Converts a JS string to a UTF-8 "byte" array.
* @param {string} str 16-bit unicode string.
* @return {Array.<number>} UTF-8 byte array.
*/
goog.crypt.stringToUtf8ByteArray = function(str) {
// TODO(user): Use native implementations if/when available
str = str.replace(/\r\n/g, '\n');
var out = [], p = 0;
for (var i = 0; i < str.length; i++) {
var c = str.charCodeAt(i);
if (c < 128) {
out[p++] = c;
} else if (c < 2048) {
out[p++] = (c >> 6) | 192;
out[p++] = (c & 63) | 128;
} else {
out[p++] = (c >> 12) | 224;
out[p++] = ((c >> 6) & 63) | 128;
out[p++] = (c & 63) | 128;
}
}
return out;
};
/**
* Converts a UTF-8 byte array to JavaScript's 16-bit Unicode.
* @param {Array.<number>} bytes UTF-8 byte array.
* @return {string} 16-bit Unicode string.
*/
goog.crypt.utf8ByteArrayToString = function(bytes) {
// TODO(user): Use native implementations if/when available
var out = [], pos = 0, c = 0;
while (pos < bytes.length) {
var c1 = bytes[pos++];
if (c1 < 128) {
out[c++] = String.fromCharCode(c1);
} else if (c1 > 191 && c1 < 224) {
var c2 = bytes[pos++];
out[c++] = String.fromCharCode((c1 & 31) << 6 | c2 & 63);
} else {
var c2 = bytes[pos++];
var c3 = bytes[pos++];
out[c++] = String.fromCharCode(
(c1 & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
}
}
return out.join('');
};
|
