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Arduino library for the ATSHA204 authentication chip
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/* | |
* Arduino library for the ATSHA204 authentication chip. | |
* | |
* The ATSHA204 is a tiny and low-power authentication chip. This library | |
* implements a simple interface to access most of the chip functionality from | |
* an Arduino. | |
* | |
* Note that only the Single-Wire Interface (SWI) is currently supported. | |
* | |
* FEATURES: | |
* + Raw memory read | |
* + Config and Data memory lock | |
* + Random number generator | |
* + Nonce generation | |
* + Key derivation | |
* | |
* GETTING STARTED: | |
* | |
* #include <ATSHA204.h> | |
* | |
* #define ATSHA204_PIN 9 | |
* | |
* ATSHA204 sha204(ATSHA204_PIN); | |
* | |
* int rc; | |
* | |
* void setup() { | |
* Serial.begin(9600); | |
* | |
* if (sha204.wake()) | |
* while (1); // error | |
* | |
* //sha204.lock(0); | |
* } | |
* | |
* void loop() { | |
* int i; | |
* uint8_t buf[32]; | |
* | |
* rc = sha204.wake(); | |
* if (rc) Serial.println("wake(): error"); | |
* | |
* // check if config memory is locked | |
* rc = sha204.read(0, 0x15, buf, 4); | |
* if (rc) Serial.println("read(): error"); | |
* | |
* if (buf[3] == 0x55) | |
* Serial.println("Config is not locked"); | |
* | |
* // generate and print random numbers | |
* Serial.print("Random numbers: "); | |
* | |
* rc = sha204.rand(1, buf); | |
* if (rc) Serial.println("rand(): error"); | |
* | |
* for (i = 0; i < 32; i++) | |
* Serial.print(buf[i], HEX); | |
* | |
* Serial.println(""); | |
* | |
* delay(5000); | |
* } | |
* | |
* TODO | |
* + Raw memory write | |
* + HMAC generation | |
* + Digest generation | |
* + ... | |
* | |
* Copyright (c) 2013, Alessandro Ghedini | |
* All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions are | |
* met: | |
* | |
* * Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* | |
* * Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR | |
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
*/ | |
#include <Arduino.h> | |
#include "ATSHA204.h" | |
#include <avr/cpufunc.h> | |
#include <string.h> | |
enum ATSHA204_FLAGS { | |
FLAG_COMMAND = 0x77, | |
FLAG_TRANSMIT = 0x88, | |
FLAG_IDLE = 0xbb, | |
FLAG_SLEEP = 0xcc | |
}; | |
enum ATSHA204_ZONES { | |
CONFIG, | |
DATA, | |
OTP | |
}; | |
enum ATSHA204_OPCODES { | |
OP_DERIVE_KEY = 0x1C, | |
OP_DEV_REV = 0x30, | |
OP_GEN_DIG = 0x15, | |
OP_HMAC = 0x11, | |
OP_CHECK_MAC = 0x28, | |
OP_LOCK = 0x17, | |
OP_MAC = 0x18, | |
OP_NONCE = 0x16, | |
OP_PAUSE = 0x01, | |
OP_RANDOM = 0x1B, | |
OP_READ = 0x02, | |
OP_WRITE = 0x12 | |
}; | |
enum ATSHA204_ERRNO { | |
ERR_SUCCESS = 0x00, | |
ERR_MISCOMPARE = 0x01, | |
ERR_PARSE = 0x03, | |
ERR_EXECUTION = 0x0f, | |
ERR_WAKE = 0x11, | |
ERR_CRC = 0xff | |
}; | |
#define DELAY_WLO (60 + 20) /* min 60 us */ | |
#define DELAY_WHI (2.5 + 0.5) /* min 2.5 ms */ | |
#define DELAY_BIT (4) /* ~230.4 kbps */ | |
#define DELAY_RTX (15) | |
#define DELAY_SYN (85) | |
void crc16(uint8_t *buf, uint8_t len, uint8_t *crc) { | |
uint8_t i; | |
uint16_t crc16 = 0; | |
for (i = 0; i < len; i++) { | |
uint8_t shift; | |
for (shift = 0x01; shift > 0x00; shift <<= 1) { | |
uint8_t data_bit = (buf[i] & shift) ? 1 : 0; | |
uint8_t crc_bit = crc16 >> 15; | |
crc16 <<= 1; | |
if ((data_bit ^ crc_bit) != 0) | |
crc16 ^= 0x8005; | |
} | |
} | |
crc[0] = (uint8_t) (crc16 & 0x00FF); | |
crc[1] = (uint8_t) (crc16 >> 8); | |
} | |
ATSHA204::ATSHA204(int pin) { | |
pin_bit = digitalPinToBitMask(pin); | |
uint8_t port = digitalPinToPort(pin); | |
port_ddr = portModeRegister(port); | |
port_out = portOutputRegister(port); | |
port_in = portInputRegister(port); | |
} | |
void ATSHA204::setPin(uint8_t is_high) { | |
*port_ddr |= pin_bit; | |
if (is_high) | |
*port_out |= pin_bit; | |
else | |
*port_out &= ~pin_bit; | |
} | |
int ATSHA204::send(uint8_t *buf, uint8_t len) { | |
uint8_t i, bit_mask; | |
noInterrupts(); | |
*port_out |= pin_bit; | |
*port_ddr |= pin_bit; | |
delayMicroseconds(DELAY_RTX); | |
for (i = 0; i < len; i++) { | |
for (bit_mask = 1; bit_mask > 0; bit_mask <<= 1) { | |
if (bit_mask & buf[i]) { | |
/* One token */ | |
*port_out &= ~pin_bit; | |
delayMicroseconds(DELAY_BIT); | |
*port_out |= pin_bit; | |
delayMicroseconds(DELAY_BIT * 7); | |
} else { | |
/* Zero token */ | |
*port_out &= ~pin_bit; | |
delayMicroseconds(DELAY_BIT); | |
*port_out |= pin_bit; | |
delayMicroseconds(DELAY_BIT); | |
*port_out &= ~pin_bit; | |
delayMicroseconds(DELAY_BIT); | |
*port_out |= pin_bit; | |
delayMicroseconds(DELAY_BIT * 5); | |
} | |
} | |
} | |
interrupts(); | |
return 0; | |
} | |
int ATSHA204::recv(uint8_t *buf, uint8_t len) { | |
uint8_t status = 0; | |
uint8_t i; | |
uint8_t recv_flag = FLAG_TRANSMIT; | |
send(&recv_flag, 1); | |
noInterrupts(); | |
*port_ddr &= ~pin_bit; | |
for (i = 0; i < len; i++) { | |
uint8_t bit_mask; | |
for (bit_mask = 1; bit_mask > 0; bit_mask <<= 1) { | |
uint8_t pulse_count = 0; | |
uint8_t timeout_count = 255; | |
/* Start pulse */ | |
while (--timeout_count > 0) { | |
if ((*port_in & pin_bit) == 0) /* falling */ | |
break; | |
} | |
if (timeout_count == 0) { | |
status = -1; | |
break; | |
} | |
do { | |
if ((*port_in & pin_bit) != 0) { /* rising */ | |
pulse_count = 1; | |
break; | |
} | |
} while (--timeout_count > 0); | |
if (pulse_count == 0) { | |
status = -1; | |
break; | |
} | |
timeout_count = 26; | |
do { | |
if ((*port_in & pin_bit) == 0) { | |
pulse_count = 2; | |
break; | |
} | |
} while (--timeout_count > 0); | |
if (pulse_count == 2) { | |
do { | |
if ((*port_in & pin_bit) != 0) | |
break; | |
} while (timeout_count-- > 0); | |
} else | |
buf[i] |= bit_mask; /* one token */ | |
} | |
if (status != 0) | |
break; | |
} | |
interrupts(); | |
return status; | |
} | |
int ATSHA204::wake() { | |
uint8_t wake_resp[4]; | |
wake_resp[0] = 0; | |
wake_resp[1] = 0; | |
wake_resp[2] = 0; | |
wake_resp[3] = 0; | |
setPin(0); | |
delayMicroseconds(DELAY_WLO); | |
setPin(1); | |
delay(DELAY_WHI); | |
recv(wake_resp, 4); | |
if ((wake_resp[0] == 4) && (wake_resp[1] == ERR_WAKE)) | |
return 0; | |
else | |
return -1; | |
} | |
int ATSHA204::sleep() { | |
uint8_t flag = FLAG_SLEEP; | |
return send(&flag, 1); | |
} | |
int ATSHA204::sync(uint8_t *buf, uint8_t len) { | |
int rc; | |
uint8_t sleep = FLAG_SLEEP; | |
delay(DELAY_SYN); | |
rc = recv(buf, len); | |
if (!rc) return rc; | |
this -> sleep(); | |
return wake(); | |
} | |
int ATSHA204::exec(uint8_t *tx, uint8_t tx_len, | |
uint8_t *rx, uint8_t rx_len, | |
uint8_t exec_delay, uint8_t max_delay) { | |
uint8_t rx_crc[2]; | |
uint8_t cmd_flag = FLAG_COMMAND; | |
crc16(tx, tx_len - 2, tx + (tx_len - 2)); | |
send(&cmd_flag, 1); | |
send(tx, tx_len); | |
delay(exec_delay); | |
/* FIXME: use max_delay */ | |
do { | |
recv(rx, rx_len); | |
} while (rx[0] == 0); | |
if (rx[0] != rx_len) | |
return -1; | |
crc16(rx, (rx_len - 2), rx_crc); | |
if ((rx_crc[0] == rx[rx_len - 2]) && (rx_crc[1] == rx[rx_len - 1])) | |
return 0; | |
/* crc check failed */ | |
return -1; | |
} | |
int ATSHA204::serial(uint8_t *buf) { | |
int rc, i = 0; | |
uint8_t tmp[4]; | |
/* memory barrier to avoid buf writes re-ordering */ | |
__asm__ __volatile__("":::"memory"); | |
rc = read(0, 0, buf, 4); | |
if (rc) return rc; | |
i += 4; | |
rc = read(0, 0x02, buf + i, 4); | |
if (rc) return rc; | |
i += 4; | |
rc = read(0, 0x03, tmp, 4); | |
if (rc) return rc; | |
buf[i] = tmp[0]; | |
return 0; | |
} | |
int ATSHA204::devRev(uint8_t *buf) { | |
int rc; | |
uint8_t cmd[7]; | |
uint8_t resp[7]; | |
memset(resp, 0x00, 7); | |
cmd[0] = 7; | |
cmd[1] = OP_DEV_REV; | |
cmd[2] = 0; | |
cmd[3] = 0; | |
cmd[4] = 0; | |
rc = exec(cmd, cmd[0], resp, 7, 1, 2); | |
memcpy(buf, resp + 1, 4); | |
return rc; | |
} | |
int ATSHA204::read(uint8_t zone, uint16_t addr, uint8_t *buf, uint8_t len) { | |
int rc; | |
uint8_t cmd[7]; | |
uint8_t resp[len + 3]; | |
memset(resp, 0x00, len + 3); | |
if (len == 32) | |
zone |= (1 << 8); | |
cmd[0] = 7; | |
cmd[1] = OP_READ; | |
cmd[2] = zone; | |
cmd[3] = addr; | |
cmd[4] = 0; | |
rc = exec(cmd, cmd[0], resp, len + 3, 1, 4); | |
memcpy(buf, resp + 1, len); | |
return rc; | |
} | |
int ATSHA204::write(uint8_t zone, uint8_t addr, | |
uint8_t *buf, uint8_t len, uint8_t *mac) { | |
int rc; | |
uint8_t cmd[72]; | |
uint8_t resp[4]; | |
memset(resp, 0x00, 4); | |
uint8_t data_size = len; | |
if ((len != 4) || (len != 32)) | |
return -1; | |
if (len == 32) | |
zone |= (1 << 8); | |
if (mac) | |
data_size += 32; | |
cmd[0] = 7 + data_size; | |
cmd[1] = OP_READ; | |
cmd[2] = zone; | |
cmd[3] = addr; | |
cmd[4] = 0; | |
memcpy(cmd + 5, buf, len); | |
if (mac) | |
memcpy(cmd + 5 + len, mac, 32); | |
rc = exec(cmd, cmd[0], resp, 4, 4, 42); | |
if (cmd[1] != ERR_SUCCES) | |
return cmd[1]; | |
return rc; | |
} | |
int ATSHA204::lock(uint8_t zone) { | |
uint8_t cmd[7]; | |
uint8_t resp[7]; | |
memset(resp, 0x00, 7); | |
/* FIXME: check CRC */ | |
zone |= (1 << 8); | |
cmd[0] = 7; | |
cmd[1] = OP_LOCK; | |
cmd[2] = zone; | |
cmd[3] = 0; | |
cmd[4] = 0; | |
return exec(cmd, cmd[0], resp, 7, 5, 24); | |
} | |
int ATSHA204::rand(uint8_t update, uint8_t *buf) { | |
int rc; | |
uint8_t cmd[7]; | |
uint8_t resp[35]; | |
memset(resp, 0x00, 35); | |
cmd[0] = 7; | |
cmd[1] = OP_RANDOM; | |
cmd[2] = !update; | |
cmd[3] = 0; | |
cmd[4] = 0; | |
rc = exec(cmd, cmd[0], resp, 35, 11, 50); | |
memcpy(buf, resp + 1, 32); | |
return rc; | |
} | |
int ATSHA204::nonce(uint8_t mode, uint8_t *in, uint8_t *out) { | |
int rc; | |
uint8_t cmd[39]; | |
uint8_t resp[35]; | |
uint8_t data_size = 0; | |
uint8_t resp_size = 0; | |
switch (mode) { | |
case 0: | |
case 1: | |
data_size = 20; | |
resp_size = 35; | |
break; | |
case 3: | |
data_size = 32; | |
resp_size = 4; | |
break; | |
default: | |
return -1; | |
} | |
memset(resp, 0x00, resp_size); | |
cmd[0] = 7 + data_size; | |
cmd[1] = OP_NONCE; | |
cmd[2] = mode; | |
cmd[3] = 0; | |
cmd[4] = 0; | |
memcpy(cmd + 5, in, data_size); | |
rc = exec(cmd, cmd[0], resp, resp_size, 11, 50); | |
memcpy(out, resp + 1, resp_size - 3); | |
return rc; | |
} | |
int ATSHA204::deriveKey(uint8_t random, uint8_t target, uint8_t *mac) { | |
int rc; | |
uint8_t cmd[39]; | |
uint8_t data_size = 0; | |
uint8_t resp[4]; | |
memset(resp, 0x00, 4); | |
cmd[0] = 7 + data_size; | |
cmd[1] = OP_DERIVE_KEY; | |
cmd[2] = random; | |
cmd[3] = 0; | |
cmd[4] = 0; | |
rc = exec(cmd, cmd[0], resp, 4, 14, 62); | |
if (resp[1]) | |
return resp[1]; | |
return rc; | |
} |
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/* | |
* Arduino library for the ATSHA204 authentication chip. | |
* | |
* Copyright (c) 2013, Alessandro Ghedini | |
* All rights reserved. | |
* | |
* Redistribution and use in source and binary forms, with or without | |
* modification, are permitted provided that the following conditions are | |
* met: | |
* | |
* * Redistributions of source code must retain the above copyright | |
* notice, this list of conditions and the following disclaimer. | |
* | |
* * Redistributions in binary form must reproduce the above copyright | |
* notice, this list of conditions and the following disclaimer in the | |
* documentation and/or other materials provided with the distribution. | |
* | |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS | |
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, | |
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR | |
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR | |
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR | |
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
*/ | |
#ifndef ATSHA204_H | |
#define ATSHA204_H | |
class ATSHA204 { | |
public: | |
ATSHA204(int pin); | |
int sleep(); | |
int wake(); | |
int sync(uint8_t *buf, uint8_t len); | |
int serial(uint8_t *buf); | |
int devRev(uint8_t *buf); | |
int read(uint8_t zone, uint16_t addr, | |
uint8_t *buf, uint8_t len); | |
int write(uint8_t zone, uint8_t addr, | |
uint8_t *buf, uint8_t len, uint8_t *mac); | |
int lock(uint8_t zone); | |
int rand(uint8_t update, uint8_t *buf); | |
int nonce(uint8_t mode, uint8_t *in, uint8_t *out); | |
int deriveKey(uint8_t random, uint8_t target, uint8_t *macW); | |
private: | |
int pin; | |
uint8_t pin_bit; | |
volatile uint8_t *port_ddr, *port_out, *port_in; | |
void setPin(uint8_t is_high); | |
int send(uint8_t *buf, uint8_t len); | |
int recv(uint8_t *buf, uint8_t len); | |
int exec(uint8_t *tx, uint8_t tx_len, | |
uint8_t *rx, uint8_t rx_len, | |
uint8_t exec_delay, uint8_t max_delay); | |
}; | |
#endif |
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Hi,
Just a question. Can you tell me how I can write in the EEPROM, in particular what is mac??
I m testing the istruction: rc = sha204.write(2,0x41,buf,4,mac);
but i don t have any result of written....
Thanks