1 files changed, 75 insertions, 0 deletions
diff --git a/js/dojo/dojox/encoding/crypto/RSAKey.js b/js/dojo/dojox/encoding/crypto/RSAKey.js
new file mode 100644
index 0000000..be1707c
--- /dev/null
+++ b/js/dojo/dojox/encoding/crypto/RSAKey.js
@@ -0,0 +1,75 @@
+//>>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;
+		}
+	});
+});