/*********************************************************************
 *
 *               Secure Random Number Generator Headers
 *
 *********************************************************************
 * FileName:        Random.h
 * Dependencies:    None
 * Processor:       PIC18, PIC24F, PIC24H, dsPIC30F, dsPIC33F
 * Compiler:        Microchip C18 v3.02 or higher
 *					Microchip C30 v2.01 or higher
 * Company:         Microchip Technology, Inc.
 *
 * Software License Agreement
 *
 * Copyright (C) 2002-2008 Microchip Technology Inc.  All rights 
 * reserved.
 *
 * Microchip licenses to you the right to use, modify, copy, and 
 * distribute: 
 * (i)  the Software when embedded on a Microchip microcontroller or 
 *      digital signal controller product ("Device") which is 
 *      integrated into Licensee's product; or
 * (ii) ONLY the Software driver source files ENC28J60.c and 
 *      ENC28J60.h ported to a non-Microchip device used in 
 *      conjunction with a Microchip ethernet controller for the 
 *      sole purpose of interfacing with the ethernet controller. 
 *
 * You should refer to the license agreement accompanying this 
 * Software for additional information regarding your rights and 
 * obligations.
 *
 * THE SOFTWARE AND DOCUMENTATION ARE PROVIDED "AS IS" WITHOUT 
 * WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED, INCLUDING WITHOUT 
 * LIMITATION, ANY WARRANTY OF MERCHANTABILITY, FITNESS FOR A 
 * PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT SHALL 
 * MICROCHIP BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR 
 * CONSEQUENTIAL DAMAGES, LOST PROFITS OR LOST DATA, COST OF 
 * PROCUREMENT OF SUBSTITUTE GOODS, TECHNOLOGY OR SERVICES, ANY CLAIMS 
 * BY THIRD PARTIES (INCLUDING BUT NOT LIMITED TO ANY DEFENSE 
 * THEREOF), ANY CLAIMS FOR INDEMNITY OR CONTRIBUTION, OR OTHER 
 * SIMILAR COSTS, WHETHER ASSERTED ON THE BASIS OF CONTRACT, TORT 
 * (INCLUDING NEGLIGENCE), BREACH OF WARRANTY, OR OTHERWISE.
 *
 *
 * Author               Date    Comment
 *~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 * Elliott Wood	     	5/09/07     Original        (Rev 1.0)
 ********************************************************************/

#ifndef __RANDOM_H
#define __RANDOM_H

#if defined(STACK_USE_RANDOM)

#define STACK_USE_SHA1

//Entropy is generated as follows:
//	1. 	For every packet received, the last byte of the remote 
//		MAC address and the four bytes of TickGet() are added
//		to a SHA-1 Hash (the seed)
//	2.	Every time a random byte is requested, the hash is
//		calculated and the hash sum is hashed into the seed.
//	3.	Up to 20 bytes are returned from this hash sum before
//		a new hash is calculated.
//	4.	Every time new entropy is added, the remaining random
//		output is discarded and new random bytes will be 
//		generated upon future calls to RandomGet().

void RandomInit(void);
BYTE RandomGet(void);
void RandomAdd(BYTE data);

#endif

#endif
