89 lines
3.5 KiB
Markdown
89 lines
3.5 KiB
Markdown
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# MSP430 Example
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This example was designed to be used with the MSP430F5359/MSP430F5659 but can be ported to any similar MSP platform. It will take ~50KB of ROM space and a 8KB of statically allocated RAM (nearly half for constants).
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The example runs at 8MHz and executes a benchmark of ECC key generations, shared secrets and 1KB ChaCha20/Poly1305 encryption.
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At 8MHz the ECC steps will take 13-15 seconds each and 1000 iterations of ChaCha20/Poly1305 will take about 45 seconds.
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## Hardware Setup
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A basic development board / ISP combination will work fine, such as the MSP-TS430PZ100 series with the MSP-FET430 series programmer.
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The example will output text via UART 1, on the MSP430 which is port 8 bits 2&3 (pins 60/61) on the MSP430F5359. The UART will run at 57600 baud.
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In addition every second port 1 bit 1 will be toggled on/off (typically an LED would be here).
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## IDE setup
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When setting up the IDE, copy the wolfSSL source code to your project's directory and add all the .c and .h files from `wolfcrypt/src` to your project.
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Use the `main.c` provided here and copy the `user_settings.h` file to the `wolfssl/wolfcrypt` subdirectory of wolfSSL.
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You will need to set at least 700 bytes of stack, no heap is required. You will also need to change the "Library Configuration" to "Full DLIB" so the `printf()` functions work correctly.
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Make sure to add the definition `WOLFSSL_USER_SETTINGS` to the preprocessor settings in your project to that `user_settings.h` is loaded in. You will also need to add the wolfSSL root directory to the "Additional include directories".
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From here you can set any optimizer settings you need.
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## MSP430 GCC Makefile
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Also included is a `Makefile` for TI's GCC, when compiling with GCC the code size will be larger and the application will be ~2x slower.
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To use this Makefile you will need [TI's MSP430 GCC](https://www.ti.com/tool/MSP430-GCC-OPENSOURCE) installed as well as `mspdebug` with the `libmsp430.so` accessible to it. You will need to edit the `Makefile` to set the `TI_COMPILER_PATH` to where you have installed this.
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Once everything is in place you can run `make` to build it and `make install` to flash the MSP430 with it.
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**Note**: this will not work with the much older version of MSP430 GCC that comes in Linux distribution repositories.
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## Example Output
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This is an example output for the demo application when compiled with IAR.
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```
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START!
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Rand generated: 2317
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Rand generated: -31901
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Rand generated: 13538
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Rand generated: -24035
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Rand generated: 18849
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Rand generated: -1593
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Rand generated: 29653
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Rand generated: -8148
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Rand generated: -27438
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Rand generated: 618
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Rand generated: -17119
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Rand generated: 4668
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Rand generated: -26289
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Rand generated: 28126
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Rand generated: -15749
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Rand generated: 22041
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Rand generated: 8710
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Rand generated: -22039
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Rand generated: 1781
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Rand generated: -32168
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Rand generated: 6187
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Rand generated: -7650
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Rand generated: 30268
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Rand generated: -13585
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Rand generated: 24388
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Rand generated: 8520
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RNG init
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Alice init
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Bob init
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.............Alice keygen 13 seconds
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..............Bob keygen 14 seconds
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.............Bob secret 13 seconds
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..............Alice secret 14 seconds
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Successfully generated a common secret
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Alices' Secret: 85f3c7f599620c768e6dbb77dc2f8f764254cc1821aeb0a30503632dbc9bdb54
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Bobs' Secret: 85f3c7f599620c768e6dbb77dc2f8f764254cc1821aeb0a30503632dbc9bdb54
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ChaCha20/Poly1305 Encryption Start, 1000 iterations, 1024 bytes
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............................................
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End 44 seconds
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ChaCha20/Poly1305 Decryption Start, 1000 iterations
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............................................
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End 44 seconds
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end
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```
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