MIKROE-2761

    Secure 3 click PID: MIKROE-2761       Secure 3 click carries the ATSHA204A, a cryptographic coprocessor with secure hardwarebased key storage from Microchip. The click is designed to run on either 3.3V or 5V power supply. Secure 3 click communicates with the target microcontroller over an I2C interface. It is ideal to use for:     Secure download and boot ‐ authentication and protect code in‐transit  Ecosystem control ‐ ensure only OEM/licensed nodes and accessories work  Anti‐cloning ‐ prevent building with identical BOM or stolen code  Message security ‐ authentication, message integrity, and confidentiality of network nodes (IoT)  NOTE: The click comes with stacking headers which allow you to combine it with other clicks more easily  by using just one mikroBUS™ socket.  ATSHA204A features The ATSHA204A is a member of the Microchip CryptoAuthentication™ family of high-security hardware authentication devices, which uses Secure Hash Algorithm (SHA-256) with 256-bit key length, message authentication code (MAC) and hash-based message authentication code (HMAC) options. It has a flexible command set that allows use in many applications. The ATSHA204A device includes an Electrically Erasable Programmable Read-Only Memory (EEPROM) array that can be used for key storage, miscellaneous read/write data, read-only, secret data, consumption logging, and security configuration. Access to the various sections of memory can be restricted in a variety of ways, and the configuration can then be locked to prevent changes. Specifications Type  EEPROM  On‐board  modules  ATSHA204A ‐ a cryptographic coprocessor with secure hardware‐based key storage  superior SHA‐256 hash algorithm with 256‐bit key length, message authentication code  Key Features  (MAC) and hash‐based message authentication code (HMAC) options, storage for up to  sixteen keys   Key Benefits  cost‐effective symmetric authentication solution  Interface  I2C  Input  Voltage  3.3V or 5V  Click board  size  M (42.9 x 25.4 mm)  Pinout diagram This table shows how the pinout on Secure 3 click corresponds to the pinout on the mikroBUS™ socket (the latter shown in the two middle columns). Notes  Pin  Pin  Notes    NC  1  AN  PWM  16  NC      NC  2  RST  INT  15  NC      NC  3  CS  TX  14  NC      NC  4  SCK  RX  13  NC      NC  5  MISO  SCL  12  SCL  I2C clock  NC  6  MOSI  SDA  11  SDA  I2C data  Power supply  +3.3V  7  3.3V  5V  10  +5V  Power supply  Ground  GND  GND  9  GND  Ground      GND  8  Jumpers and settings Designator  Name  JP1  VIO  SEL.  Default  Position  Left  Default  Option  3V3  Description  Power Supply Voltage Selection 3V3/5V, left position  3V3, right position 5V      Programming Code examples for Secure 3 click, written for MikroElektronika hardware and compilers are available on Libstock. Code snippet The following code snippet creates a MAC for a given input and then checks if it is valid using verify function. 01 static void MACTest () 02 { 03 //Generates nonce for use in MAC generation 04 memset (bufferIn, 0x45, 128); 05 if (atcab_nonce(bufferIn) == ATCA_SUCCESS) 06 { 07 LOG( "rnrn Nonce generated." ); 08 } 09 else LOG( "rnrn Nonce generation failed..." ); 10 delay_ms (1500); 11 12 //Generates MAC for given input 13 memset (bufferOut, 0x00, 128); 14 memset (bufferIn, 0x14, 128); 15 if (atcab_mac( 0, 0, bufferIn, bufferOut ) == ATCA_SUCCESS) 16 { 17 LOG( "rnrn MAC generated: " ); 18 outputHex (bufferOut, 32); 19 } 20 else LOG( "rnrn Mac generation failed..." ); 21 delay_ms (1500); 22 23 //Checks if the generated MAC is valid 24 memset (bufferIn, 0x14, 128); 25 if (atcab_checkmac( 0, 0, bufferIn, bufferOut, otherData) == ATCA_SUCCESS) 26 { 27 LOG( "rnrn Check MAC successful. " ); 28 } 29 else LOG( "rnrn Check MAC failed..." ); 30 }                                                                https://shop.mikroe.com/secure‐3‐click 9‐29‐17