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pigweed / third_party / github / kmackay / micro-ecc / bcc8143addcab786322f1a1a159151ea9196f3a1
commitbcc8143addcab786322f1a1a159151ea9196f3a1[log] [tgz]
authorKen MacKay <kmackay@gmail.com>Tue Mar 08 07:59:43 2016 -0800
committerKen MacKay <kmackay@gmail.com>Tue Mar 08 07:59:43 2016 -0800
tree7e02e4b676b96ab75e12b49179823ae6413e9403
parentb970244fa1ae075c8ce575ebfb6f870877217b36 [diff]
parentceae2ca0883291536ede3b5aa1f4ea852233f3d7 [diff]
Merge pull request #72 from carlescufi/master

Add a new compile-time macro to use the local native format for VLI
tree: 7e02e4b676b96ab75e12b49179823ae6413e9403
  1. scripts/
  2. test/
  3. .gitignore
  4. asm_arm.inc
  5. asm_arm_mult_square.inc
  6. asm_avr.inc
  7. asm_avr_mult_square.inc
  8. curve-specific.inc
  9. emk_project.py
  10. emk_rules.py
  11. LICENSE.txt
  12. platform-specific.inc
  13. README.md
  14. types.h
  15. uECC.c
  16. uECC.h
  17. uECC_vli.h
README.md

micro-ecc

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.

Features

  • 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.

Usage Notes

Point Representation

Compressed points are represented in the standard format as defined in http://www.secg.org/collateral/sec1_final.pdf; uncompressed points are represented in standard format, but without the 0x04 prefix. All functions except uECC_compress() 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.

Using the Code

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 just create a symlink to the uECC directory in your Arduino libraries directory. 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.

Compilation Notes

  • 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=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 with uECC_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 the advapi32.lib system library.