wxmp-rsa
Version:
兼容小程序环境的rsa加解密库，支持超长文本和中文字符
65 lines (64 loc) • 2.37 kB
JavaScript
// Hex JavaScript decoder
// Copyright (c) 2008-2013 Lapo Luchini <lapo@lapo.it>
// Permission to use, copy, modify, and/or distribute this software for any
// purpose with or without fee is hereby granted, provided that the above
// copyright notice and this permission notice appear in all copies.
//
// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
// ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
// ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
// OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
/*jshint browser: true, strict: true, immed: true, latedef: true, undef: true, regexdash: false */
var decoder;
export var Hex = {
decode: function (a) {
var i;
if (decoder === undefined) {
var hex = "0123456789ABCDEF";
var ignore = " \f\n\r\t\u00A0\u2028\u2029";
decoder = {};
for (i = 0; i < 16; ++i) {
decoder[hex.charAt(i)] = i;
}
hex = hex.toLowerCase();
for (i = 10; i < 16; ++i) {
decoder[hex.charAt(i)] = i;
}
for (i = 0; i < ignore.length; ++i) {
decoder[ignore.charAt(i)] = -1;
}
}
var out = [];
var bits = 0;
var char_count = 0;
for (i = 0; i < a.length; ++i) {
var c = a.charAt(i);
if (c == "=") {
break;
}
c = decoder[c];
if (c == -1) {
continue;
}
if (c === undefined) {
throw new Error("Illegal character at offset " + i);
}
bits |= c;
if (++char_count >= 2) {
out[out.length] = bits;
bits = 0;
char_count = 0;
}
else {
bits <<= 4;
}
}
if (char_count) {
throw new Error("Hex encoding incomplete: 4 bits missing");
}
return out;
}
};