--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/NaCl/crypto_stream/xsalsa20.cs	Mon Apr 15 00:43:48 2013 +0200
@@ -0,0 +1,32 @@
+using System;
+
+namespace UCIS.NaCl.crypto_stream {
+	static unsafe class xsalsa20 {
+		public const int KEYBYTES = 32;
+		public const int NONCEBYTES = 24;
+
+		//Never written to
+		static Byte[] sigma = new Byte[16] {(Byte)'e', (Byte)'x', (Byte)'p', (Byte)'a', //[16] = "expand 32-byte k";
+											(Byte)'n', (Byte)'d', (Byte)' ', (Byte)'3',
+											(Byte)'2', (Byte)'-', (Byte)'b', (Byte)'y',
+											(Byte)'t', (Byte)'e', (Byte)' ', (Byte)'k', };
+
+		public static void crypto_stream(Byte* c, int clen, Byte* n, Byte* k) {
+			Byte* subkey = stackalloc Byte[32];
+			crypto_core.hsalsa20.crypto_core(subkey, n, k, sigma);
+			salsa20.crypto_stream(c, clen, n + 16, subkey);
+		}
+
+		public static void crypto_stream_xor(Byte* c, Byte* m, UInt64 mlen, Byte* n, Byte* k) {
+			Byte* subkey = stackalloc Byte[32];
+			crypto_core.hsalsa20.crypto_core(subkey, n, k, sigma);
+			salsa20.crypto_stream_xor(c, m, (int)mlen, n + 16, subkey);
+		}
+
+		internal static void crypto_stream_xor_split(Byte* mcpad, int padbytes, Byte* c, Byte* m, UInt64 mlen, Byte* n, Byte* k) {
+			Byte* subkey = stackalloc Byte[32];
+			crypto_core.hsalsa20.crypto_core(subkey, n, k, sigma);
+			salsa20.crypto_stream_xor_split(mcpad, padbytes, c, m, (int)mlen, n + 16, subkey);
+		}
+	}
+}
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