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A small and fast ECDH and ECDSA implementation for 8-bit, 32-bit, and 64-bit processors.

The static version of micro-ecc (ie, where the curve was selected at compile-time) can be found in the "static" branch.

• Resistant to known side-channel attacks.
• Written in C, with optional GCC inline assembly for AVR, ARM and Thumb platforms.
• Supports 8, 32, and 64-bit architectures.
• Small code size.
• No dynamic memory allocation.
• Support for 5 standard curves: secp160r1, secp192r1, secp224r1, secp256r1, and secp256k1.
• BSD 2-clause license.

Compressed points are represented in the standard format as defined inhttp://www.secg.org/sec1-v2.pdf; uncompressed points are represented in standard format, but without the0x04 prefix. All functions exceptuECC_decompress() only accept uncompressed points; useuECC_compress() anduECC_decompress() to convert between compressed and uncompressed point representations.

Private keys are represented in the standard format.

I recommend just copying (or symlink) the uECC files into your project. Then just#include "uECC.h" to use the micro-ecc functions.

For use with Arduino, you can use the Library Manager to download micro-ecc (Sketch=>Include Library=>Manage Libraries). You can then use uECC just like any other Arduino library (uECC should show up in theSketch=>Import Library submenu).

See uECC.h for documentation for each function.

• Should compile with any C/C++ compiler that supports stdint.h (this includes Visual Studio 2013).
• If you want to change the defaults for any of the uECC compile-time options (such asuECC_OPTIMIZATION_LEVEL), you must change them in your Makefile or similar so that uECC.c is compiled with the desired values (ie, compile uECC.c with-DuECC_OPTIMIZATION_LEVEL=3 or whatever).
• When compiling for a Thumb-1 platform, you must use the-fomit-frame-pointer GCC option (this is enabled by default when compiling with-O1 or higher).
• When compiling for an ARM/Thumb-2 platform withuECC_OPTIMIZATION_LEVEL >= 3, you must use the-fomit-frame-pointer GCC option (this is enabled by default when compiling with-O1 or higher).
• When compiling for AVR, you must have optimizations enabled (compile with-O1 or higher).
• When building for Windows, you will need to link in theadvapi32.lib system library.