New git repository for release - version 0.2.0 tagged

node/Salsa20.hpp

@@ -0,0 +1,73 @@
+/*
+ * Based on public domain code available at: http://cr.yp.to/snuffle.html
+ *
+ * This therefore is public domain.
+ */
+
+#ifndef _ZT_SALSA20_HPP
+#define _ZT_SALSA20_HPP
+
+#include <stdint.h>
+#include "Constants.hpp"
+
+namespace ZeroTier {
+
+/**
+ * Salsa20/20 stream cipher
+ */
+class Salsa20
+{
+public:
+	Salsa20() throw() {}
+
+	/**
+	 * @param key Key bits
+	 * @param kbits Number of key bits: 128 or 256 (recommended)
+	 * @param iv 64-bit initialization vector
+	 */
+	Salsa20(const void *key,unsigned int kbits,const void *iv)
+		throw()
+	{
+		init(key,kbits,iv);
+	}
+
+	/**
+	 * Initialize cipher
+	 *
+	 * @param key Key bits
+	 * @param kbits Number of key bits: 128 or 256 (recommended)
+	 * @param iv 64-bit initialization vector
+	 */
+	void init(const void *key,unsigned int kbits,const void *iv)
+		throw();
+
+	/**
+	 * Encrypt data
+	 *
+	 * @param in Input data
+	 * @param out Output buffer
+	 * @param bytes Length of data
+	 */
+	void encrypt(const void *in,void *out,unsigned int bytes)
+		throw();
+
+	/**
+	 * Decrypt data
+	 *
+	 * @param in Input data
+	 * @param out Output buffer
+	 * @param bytes Length of data
+	 */
+	inline void decrypt(const void *in,void *out,unsigned int bytes)
+		throw()
+	{
+		encrypt(in,out,bytes);
+	}
+
+private:
+	uint32_t _state[16];
+};
+
+} // namespace ZeroTier
+
+#endif