76 lines
1.9 KiB
JavaScript
76 lines
1.9 KiB
JavaScript
|
//>>built
|
||
|
|
define("dojox/encoding/crypto/RSAKey", [
|
||
|
|
"dojo/_base/kernel",
|
||
|
|
"dojo/_base/declare",
|
||
|
|
"../../math/BigInteger",
|
||
|
|
"../../math/random/Simple"
|
||
|
|
], function(kernel, declare, BigInteger, Simple) {
|
||
|
|
|
||
|
|
kernel.experimental("dojox.encoding.crypto.RSAKey");
|
||
|
|
|
||
|
|
// Copyright (c) 2005 Tom Wu
|
||
|
|
// All Rights Reserved.
|
||
|
|
// See "LICENSE-BigInteger" in dojox.math for details.
|
||
|
|
|
||
|
|
var defaultRngf = function(){ return new Simple(); };
|
||
|
|
|
||
|
|
// PKCS#1 (type 2, random) pad input string s to n bytes, and return a bigint
|
||
|
|
function pkcs1pad2(s, n, rngf) {
|
||
|
|
if(n < s.length + 11) {
|
||
|
|
throw new Error("Message too long for RSA");
|
||
|
|
}
|
||
|
|
var ba = new Array(n);
|
||
|
|
var i = s.length;
|
||
|
|
while(i && n) ba[--n] = s.charCodeAt(--i);
|
||
|
|
ba[--n] = 0;
|
||
|
|
var rng = rngf();
|
||
|
|
var x = [0];
|
||
|
|
while(n > 2) { // random non-zero pad
|
||
|
|
x[0] = 0;
|
||
|
|
while(x[0] == 0) rng.nextBytes(x);
|
||
|
|
ba[--n] = x[0];
|
||
|
|
}
|
||
|
|
ba[--n] = 2;
|
||
|
|
ba[--n] = 0;
|
||
|
|
rng.destroy();
|
||
|
|
return new BigInteger(ba);
|
||
|
|
}
|
||
|
|
|
||
|
|
return declare("dojox.encoding.crypto.RSAKey", null, {
|
||
|
|
constructor: function(rngf){
|
||
|
|
// summary:
|
||
|
|
// "empty" RSA key constructor
|
||
|
|
// rndf: Function?:
|
||
|
|
// function that returns an instance of a random number generator
|
||
|
|
// (see dojox.math.random for details)
|
||
|
|
this.rngf = rngf || defaultRngf;
|
||
|
|
this.e = 0;
|
||
|
|
this.n = this.d = this.p = this.q = this.dmp1 = this.dmq1 = this.coeff = null;
|
||
|
|
},
|
||
|
|
|
||
|
|
setPublic: function(N, E){
|
||
|
|
// summary:
|
||
|
|
// Set the public key fields N and e from hex strings
|
||
|
|
if(N && E && N.length && E.length) {
|
||
|
|
this.n = new BigInteger(N, 16);
|
||
|
|
this.e = parseInt(E, 16);
|
||
|
|
}else{
|
||
|
|
throw new Error("Invalid RSA public key");
|
||
|
|
}
|
||
|
|
},
|
||
|
|
|
||
|
|
encrypt: function(text){
|
||
|
|
var m = pkcs1pad2(text, (this.n.bitLength() + 7) >> 3, this.rngf);
|
||
|
|
if(!m){
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
var c = m.modPowInt(this.e, this.n);
|
||
|
|
if(!c){
|
||
|
|
return null;
|
||
|
|
}
|
||
|
|
var h = c.toString(16);
|
||
|
|
return h.length % 2 ? "0" + h : h;
|
||
|
|
}
|
||
|
|
});
|
||
|
|
});
|