sha256.h

/*
* The MySensors Arduino library handles the wireless radio link and protocol
* between your home built sensors/actuators and HA controller of choice.
* The sensors forms a self healing radio network with optional repeaters. Each
* repeater and gateway builds a routing tables in EEPROM which keeps track of the
* network topology allowing messages to be routed to nodes.
*
* Created by Henrik Ekblad <[email protected]>
* Copyright (C) 2013-2019 Sensnology AB
* Full contributor list: https://github.com/mysensors/MySensors/graphs/contributors
*
* Documentation: http://www.mysensors.org
* Support Forum: http://forum.mysensors.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* ======================================================================
*
* SHA256 implementation for AVR:
*
* This file is part of the AVR-Crypto-Lib.
* Copyright (C) 2006-2015 Daniel Otte ([email protected])
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>.
*
* Author:   Daniel Otte
*
* License: GPLv3 or later
*
* ======================================================================
*/
 
#ifndef _SHA256_H_
#define _SHA256_H_
 
#define MY_CRYPTO_SHA256_ASM    
 
#define IPAD 0x36 
#define OPAD 0x5C 
 
#define SHA256_HASH_BITS  256   
#define SHA256_HASH_BYTES (SHA256_HASH_BITS/8) 
#define SHA256_BLOCK_BITS 512 
#define SHA256_BLOCK_BYTES (SHA256_BLOCK_BITS/8) 
 
 
typedef struct {
    uint32_t h[8];  
    uint64_t length;    
} sha256_ctx_t;
 
typedef uint8_t sha256_hash_t[SHA256_HASH_BYTES];
 
extern "C" {    // ASM implementation, see MyASM.S
    void sha256_init(sha256_ctx_t *state);
 
    void sha256_nextBlock(sha256_ctx_t *state, const void *block);
 
    void sha256_lastBlock(sha256_ctx_t *state, const void *block, uint16_t length_b);
 
    void sha256_ctx2hash(sha256_hash_t *dest, const sha256_ctx_t *state);
 
    void sha256(sha256_hash_t *dest, const void *msg, uint32_t length_b);
}
 
#endif