/**

* @file Hash.cpp

* @date 20.05.2015

* @author Markus Sattler

*

* Copyright (c) 2015 Markus Sattler. All rights reserved.

* This file is part of the esp8266 core for Arduino environment.

*

* This library is free software; you can redistribute it and/or

* modify it under the terms of the GNU Lesser General Public

* License as published by the Free Software Foundation; either

* version 2.1 of the License, or (at your option) any later version.

*

* This library 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

* Lesser General Public License for more details.

*

* You should have received a copy of the GNU Lesser General Public

* License along with this library; if not, write to the Free Software

* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA

*

*/

#include <Arduino.h>

#include <bearssl/bearssl_hash.h>

#include "Hash.h"

/**

* create a sha1 hash from data

* @param data uint8_t *

* @param size uint32_t

* @param hash uint8_t[20]

*/

void sha1(const uint8_t* data, uint32_t size, uint8_t hash[20]) {

br_sha1_context ctx;

#ifdef DEBUG_SHA1

os_printf("DATA:");

for(uint16_t i = 0; i < size; i++) {

os_printf("%02X", data[i]);

}

os_printf("\n");

os_printf("DATA:");

for(uint16_t i = 0; i < size; i++) {

os_printf("%c", data[i]);

}

os_printf("\n");

#endif

br_sha1_init(&ctx);

br_sha1_update(&ctx, data, size);

br_sha1_out(&ctx, hash);

#ifdef DEBUG_SHA1

os_printf("SHA1:");

for(uint16_t i = 0; i < 20; i++) {

os_printf("%02X", hash[i]);

}

os_printf("\n\n");

#endif

}

void sha1(const char* data, uint32_t size, uint8_t hash[20]) {

sha1((const uint8_t *) data, size, hash);

}

void sha1(const String& data, uint8_t hash[20]) {

sha1(data.c_str(), data.length(), hash);

}

String sha1(const uint8_t* data, uint32_t size) {

uint8_t hash[20];

String hashStr((const char*)nullptr);

hashStr.reserve(20 * 2 + 1);

sha1(&data[0], size, &hash[0]);

for(uint16_t i = 0; i < 20; i++) {

char hex[3];

snprintf(hex, sizeof(hex), "%02x", hash[i]);

hashStr += hex;

}

return hashStr;

}

String sha1(const char* data, uint32_t size) {

return sha1((const uint8_t*) data, size);

}

String sha1(const String& data) {

return sha1(data.c_str(), data.length());

}