// GPG4Browsers - An OpenPGP implementation in javascript
// Copyright (C) 2011 Recurity Labs GmbH
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
var Util = function() {
this.hexdump = function(str) {
var r="";
var e=str.length;
var c=0;
var h;
var i = 0;
while(c<e){
h=str.charCodeAt(c++).toString(16);
while(h.length<2) h="0"+h;
r+=" "+h;
i++;
if (i % 32 == 0)
r+="\n ";
}
return r;
};
/**
* create hexstring from a binary
* @param str [String] string to convert
* @return [String] string containing the hexadecimal values
*/
this.hexstrdump = function(str) {
if (str == null)
return "";
var r="";
var e=str.length;
var c=0;
var h;
while(c<e){
h=str[c++].charCodeAt().toString(16);
while(h.length<2) h="0"+h;
r+=""+h;
}
return r;
};
/**
* creating a hex string from an binary array of integers (0..255)
* @param [Array[integer 0..255]] array to convert
* @return [String] hexadecimal representation of the array
*/
this.hexidump = function(str) {
var r="";
var e=str.length;
var c=0;
var h;
while(c<e){
h=str[c++].toString(16);
while(h.length<2) h="0"+h;
r+=""+h;
}
return r;
};
/**
* convert a string to an array of integers(0.255)
* @param [String] string to convert
* @return [Array [Integer 0..255]] array of (binary) integers
*/
this.str2bin = function(str) {
var result = new Array();
for (var i = 0; i < str.length; i++) {
result[i] = str.charCodeAt(i);
}
return result;
};
/**
* convert an array of integers(0.255) to a string
* @param [Array [Integer 0..255]] array of (binary) integers to convert
* @return [String] string representation of the array
*/
this.bin2str = function(bin) {
var result = "";
for (var i = 0; i < bin.length; i++) {
result += String.fromCharCode(bin[i]);
}
return result;
};
/**
* calculates a 16bit sum of a string by adding each character codes modulus 65535
* @param text [String] string to create a sum of
* @return [Integer] an integer containing the sum of all character codes % 65535
*/
this.calc_checksum = function(text) {
var checksum = { s: 0, add: function (sadd) { this.s = (this.s + sadd) % 65536; }};
for (var i = 0; i < text.length; i++) {
checksum.add(text.charCodeAt(i));
}
return checksum.s;
};
/**
* Helper function to print a debug message. Debug
* messages are only printed if
* openpgp.config.debug is set to true. The calling
* Javascript context MUST define
* a "showMessages(text)" function. Line feeds ('\n')
* are automatically converted to HTML line feeds '<br/>'
* @param str [String] string of the debug message
* @return [String] an HTML tt entity containing a paragraph with a style attribute where the debug message is HTMLencoded in.
*/
this.print_debug = function(str) {
if (openpgp.config.debug) {
str = openpgp_encoding_html_encode(str);
showMessages("<tt><p style=\"background-color: #ffffff; width: 652px; word-break: break-word; padding: 5px; border-bottom: 1px solid black;\">"+str.replace(/\n/g,"<br>")+"</p></tt>");
}
};
/**
* Helper function to print an error message.
* The calling Javascript context MUST define
* a "showMessages(text)" function. Line feeds ('\n')
* are automatically converted to HTML line feeds '<br/>'
* @param str [String] string of the error message
* @return [String] a HTML paragraph entity with a style attribute containing the HTML encoded error message
*/
this.print_error = function(str) {
str = openpgp_encoding_html_encode(str);
showMessages("<p style=\"font-size: 80%; background-color: #FF8888; margin:0; width: 652px; word-break: break-word; padding: 5px; border-bottom: 1px solid black;\"><span style=\"color: #888;\"><b>ERROR:</b></span> "+str.replace(/\n/g,"<br>")+"</p>");
};
/**
* Helper function to print an info message.
* The calling Javascript context MUST define
* a "showMessages(text)" function. Line feeds ('\n')
* are automatically converted to HTML line feeds '<br/>'.
* @param str [String] string of the info message
* @return [String] a HTML paragraph entity with a style attribute containing the HTML encoded info message
*/
this.print_info = function(str) {
str = openpgp_encoding_html_encode(str);
showMessages("<p style=\"font-size: 80%; background-color: #88FF88; margin:0; width: 652px; word-break: break-word; padding: 5px; border-bottom: 1px solid black;\"><span style=\"color: #888;\"><b>INFO:</b></span> "+str.replace(/\n/g,"<br>")+"</p>");
};
this.print_warning = function(str) {
str = openpgp_encoding_html_encode(str);
showMessages("<p style=\"font-size: 80%; background-color: #FFAA88; margin:0; width: 652px; word-break: break-word; padding: 5px; border-bottom: 1px solid black;\"><span style=\"color: #888;\"><b>WARNING:</b></span> "+str.replace(/\n/g,"<br>")+"</p>");
};
this.getLeftNBits = function (string, bitcount) {
var rest = bitcount % 8;
if (rest == 0)
return string.substring(0, bitcount / 8);
var bytes = (bitcount - rest) / 8 +1;
var result = string.substring(0, bytes);
return this.shiftRight(result, 8-rest); // +String.fromCharCode(string.charCodeAt(bytes -1) << (8-rest) & 0xFF);
};
/**
* Shifting a string to n bits right
* @param value [String] the string to shift
* @param bitcount [Integer] amount of bits to shift (MUST be smaller than 9)
* @return [String] resulting string.
*/
this.shiftRight = function(value, bitcount) {
var temp = util.str2bin(value);
if (bitcount % 8 != 0) {
for (var i = temp.length-1; i >= 0; i--) {
temp[i] >>= bitcount % 8;
if (i > 0)
temp[i] |= (temp[i - 1] << (8 - (bitcount % 8))) & 0xFF;
}
} else {
return value;
}
return util.bin2str(temp);
};
/**
* Return the algorithm type as string
* @return [String] String representing the message type
*/
this.get_hashAlgorithmString = function(algo) {
switch(algo) {
case 1:
return "MD5";
case 2:
return "SHA1";
case 3:
return "RIPEMD160";
case 8:
return "SHA256";
case 9:
return "SHA384";
case 10:
return "SHA512";
case 11:
return "SHA224";
}
return "unknown";
};
};
/**
* an instance that should be used.
*/
var util = new Util();