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/**********************************************************************
* Copyright (C) 2018 Maxim Integrated Products, Inc., All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* Except as contained in this notice, the name of Maxim Integrated
* Products, Inc. shall not be used except as stated in the Maxim Integrated
* Products, Inc. Branding Policy.
*
* The mere transfer of this software does not imply any licenses
* of trade secrets, proprietary technology, copyrights, patents,
* trademarks, maskwork rights, or any other form of intellectual
* property whatsoever. Maxim Integrated Products, Inc. retains all
* ownership rights.
**********************************************************************/


#include "mbed.h"
//#include "max32630fthr.h"
#include "max32630hsp.h"
#include "MAX8614X.h"
#include "USBSerial.h"
void executeSha256(uint8_t *challenge, unsigned int challengeLen);
void executeSha(uint32_t *challenge, unsigned int challengeLen);


MAX32630HSP icarus(MAX32630HSP::VIO_1V8);
//    MAX32630FTHR mbed_board(MAX32630FTHR::VIO_1V8);
SPI spi(P5_1, P5_2, P5_0); /* mosi, miso, sclk */
//DigitalOut cs(P3_0);
DigitalOut cs(P5_3);
//PinName interrupt_pin = P3_3;
//PinnName interrupt_pin = P5_7;
//PinName interrupt_pin = P5_5;
//PinName interrupt_pin = P3_6;
//PinName interrupt_pin = P3_7;
//PinName interrupt_pin = P3_2;
PinName interrupt_pin = P5_4;
// Virtual serial port over USB
USBSerial microUSB; 

DigitalOut rLED(LED1);
DigitalOut gLED(LED2);
DigitalOut bLED(LED3);
int main()
{
    #define CHALLENGE_SZ_NO_SECRET 20
    uint32_t challenge_1[5] = {  // 160 bit = 5*32 bits
      0x5e813524,
      0x5663d609,
      0x998d7b0d,
      0x52128465,
      0xcd0de301
    };


    #define MAC_SZ 32


//    daplink.printf("daplink serial port\r\n");
//    microUSB.printf("micro USB serial port\r\n");
    rLED = LED_ON;
    gLED = LED_ON;
    bLED = LED_OFF;

    rLED = LED_OFF;
    printf("\r\n\rmax86140 authenication software\r\n");
//    MAX8614X m(spi,cs,interrupt_pin);
//    m.readRegister(MAX8614X::MAX8614X_PART_ID_REG, data, 1);
//    printf("device id should be 0x24, reg %02X = %02X\r\n", MAX8614X::MAX8614X_PART_ID_REG, data[0]);

//    executeSha256(challenge_1, CHALLENGE_SZ_NO_SECRET);
    executeSha(challenge_1, 5);
   //● Compare MAC from MAX86140 wth Host's precalculated MAC.
    //● Check PASS or FAIL.
    //● Disable SHA_EN bit ( Write 0 to SHA_EN bit).     
    while(1) {
        gLED = !gLED;
        wait(1.0);
    }
}

void transformData(uint8_t *inData, uint8_t *outData, unsigned int challengeLen)
{
    int i, j, k;
    k = 0;
    for (i = 0; i < (challengeLen/4); i++) {
        for (j = 3; j >= 0; j--) {
            outData[j+(i*4)] = inData[k];
            k++;
        }
    }
}



//******************************************************************
void executeSha(uint32_t *challenge, unsigned int challengeLen)
{
    int i, j, k, ctr;;
    uint8_t macData[256];
    uint8_t xData[256];
    uint32_t tmpData;
    uint8_t data[5];
    uint8_t romID;
    MAX8614X m(spi,cs,interrupt_pin);
    //● Enable SHA_DONE Interrupt
    m.writeRegister(MAX8614X::MAX8614X_INT_ENABLE2_REG, MAX8614X::MAX8614X_IE_SHA_DONE_EN);

    m.writeRegister(MAX8614X::MAX8614X_INT_ENABLE1_REG, 0);  // Disable all other interrupts

    //● Enable SHA_EN bit.
    m.writeRegister(MAX8614X::MAX8614X_SHA_CFG_REG,MAX8614X::MAX8614X_SHACFG_SHA_EN);

    //● Write 160-bit random challenge value to RAM using registers MEM_IDX and MEM_DATA.
    // Enable Memory Write, Select Bank 0, address 0x00 to 0xFF
    m.writeRegister(MAX8614X::MAX8614X_MEMORY_CONTROL_REG, MAX8614X::MAX8614X_MEMCNTRL_WR_EN_MASK | MAX8614X::MAX8614X_MEMCNTRL_BANK0_MASK);

    printf("\r\n Raw Input Data\r\n\r\n");
    for (i = 0; i < challengeLen; i++) {
        printf("% 08x\r\n", challenge[i]);
    }
    printf("\r\n");
    k = 0;
    for (i = 0; i < (challengeLen); i++) {
        tmpData = challenge[i];
        for (j = 3; j >= 0; j--) {
            xData[k] = tmpData & 0xFF;
            tmpData = tmpData >> 8;
            k++;
        }
    }

    printf("\r\n Transformed Input Data\r\n\r\n");
    for (i = 0; i < challengeLen*4; i++) {
        if (!(i % 4))
            printf("\r\n ");
            
        printf("%02x", xData[i]);
    }
        printf("\r\n ");
        printf("\r\n ");
        
    for (i = 0; i < (challengeLen*4); i++) {
        m.writeRegister(MAX8614X::MAX8614X_MEMORY_INDEX_REG, i);
        m.writeRegister(MAX8614X::MAX8614X_MEMORY_DATA_REG, xData[i]);
    }
    printf("%\r\n");

    // The message block consists of a 160-bit secret, a 160-bit challenge and 192 bits of constant data. Optionally, the 64-bit
    // ROM ID replaces 64 of the 192 bits of constant data used in the hash operation. 16 bits out of the 160-bit secret and 16
    // bits of ROM ID are programmable–8 bits each in metal and 8 bits each in OTP bits
    //● Write command, with ROM ID (0x35) or without ROM ID (0x36), to SHA_CMD register
    m.writeRegister(MAX8614X::MAX8614X_SHA_CMD_REG,MAX8614X::MAX8614X_SHACMD_MAC_ROM_ID);
//    m.writeRegister(MAX8614X::MAX8614X_SHA_CMD_REG,MAX8614X::MAX8614X_SHACMD_MAC_NO_ROM_ID);


    m.readRegister(MAX8614X::MAX8614X_INT_STATUS2_REG, data, 1);  // clear the status register
    //● Write 1 to SHA_START and 1 to SHA_EN bit.
    m.writeRegister(MAX8614X::MAX8614X_SHA_CFG_REG,MAX8614X::MAX8614X_SHACFG_SHA_EN | MAX8614X::MAX8614X_SHACFG_SHA_START);
    
    //● Pole the SHA_DONE interrupt.
    data[0] = 0;
    ctr = 0;
    while(!data[0] && ctr++ < 1000 ) {
        m.readRegister(MAX8614X::MAX8614X_INT_STATUS2_REG, data, 1);
    }
    // ● Read 256 MAC value from RAM using registers MEM_IDX and MEM_DATA.
    printf("Response Data ");
    if (romID == MAX8614X::MAX8614X_SHACMD_MAC_ROM_ID)
        printf("with ROM ID\r\n");
    else if (romID == MAX8614X::MAX8614X_SHACMD_MAC_NO_ROM_ID)
        printf("with no ROM ID\r\n");
    else
        printf(" The SHA CMD register is incorrect!\r\n");
    for (i = 64; i < 64+32; i++) {
        if (!(i % 4))
            printf("\r\n ");
        m.writeRegister(MAX8614X::MAX8614X_MEMORY_INDEX_REG, i);
        m.readRegister(MAX8614X::MAX8614X_MEMORY_DATA_REG, data, 1);
        macData[i] = data[0];
        printf("%02x", data[0]);
    } 
     printf("%\r\n");
}