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 in http://www.secg.org/sec1-v2.pdf; uncompressed points are represented in standard format, but without the 0x04 prefix. All functions except uECC_decompress() only accept uncompressed points; use uECC_compress() and uECC_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 the Sketch=>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 as
uECC_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=3or whatever). - When compiling for a Thumb-1 platform, you must use the
-fomit-frame-pointerGCC option (this is enabled by default when compiling with-O1or higher). - When compiling for an ARM/Thumb-2 platform with
uECC_OPTIMIZATION_LEVEL>= 3, you must use the-fomit-frame-pointerGCC option (this is enabled by default when compiling with-O1or higher). - When compiling for AVR, you must have optimizations enabled (compile with
-O1or higher). - When building for Windows, you will need to link in the
advapi32.libsystem library.