1 files changed, 60 insertions, 0 deletions
diff --git a/js/dojo/dojox/math/random/prng4.js b/js/dojo/dojox/math/random/prng4.js
new file mode 100644
index 0000000..1d08b4d
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+++ b/js/dojo/dojox/math/random/prng4.js
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+//>>built
+// AMD-ID "dojox/math/random/prng4"
+define("dojox/math/random/prng4", ["dojo", "dojox"], function(dojo, dojox) {
+	
+	dojo.getObject("math.random.prng4", true, dojox);
+
+// Copyright (c) 2005  Tom Wu
+// All Rights Reserved.
+// See "LICENSE-BigInteger" for details.
+
+	// prng4.js - uses Arcfour as a PRNG
+
+	function Arcfour() {
+		this.i = 0;
+		this.j = 0;
+		this.S = new Array(256);
+	}
+
+	dojo.extend(Arcfour, {
+		init: function(key){
+			// summary:
+			//	Initialize arcfour context
+			// key: Array:
+			//	an array of ints, each from [0..255]
+			var i, j, t, S = this.S, len = key.length;
+			for(i = 0; i < 256; ++i){
+				S[i] = i;
+			}
+			j = 0;
+			for(i = 0; i < 256; ++i){
+				j = (j + S[i] + key[i % len]) & 255;
+				t = S[i];
+				S[i] = S[j];
+				S[j] = t;
+			}
+			this.i = 0;
+			this.j = 0;
+		},
+
+		next: function(){
+			var t, i, j, S = this.S;
+			this.i = i = (this.i + 1) & 255;
+			this.j = j = (this.j + S[i]) & 255;
+			t = S[i];
+			S[i] = S[j];
+			S[j] = t;
+			return S[(t + S[i]) & 255];
+		}
+	});
+
+	dojox.math.random.prng4 = function(){
+		return new Arcfour();
+	};
+
+	// Pool size must be a multiple of 4 and greater than 32.
+	// An array of bytes the size of the pool will be passed to init()
+	dojox.math.random.prng4.size = 256;
+	
+	return dojox.math.random.prng4;
+});