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fuchsia / third_party / github.com / kmackay / micro-ecc / 95becf03279b80d6328277f09ce44d2c7a71a0c8
commit95becf03279b80d6328277f09ce44d2c7a71a0c8[log] [tgz]
authorKen MacKay <kmackay@gmail.com>Wed May 07 22:36:06 2014 -0700
committerKen MacKay <kmackay@gmail.com>Wed May 07 22:36:06 2014 -0700
treee0abb0ead6db83f81cad9c14cf885561c0b740a2
parent406aef7b89526c7c9b05e7084f1b5dd73384a8ed [diff]
Add fast multiplication for 192-bit and 256-bit curves.
5 files changed
tree: e0abb0ead6db83f81cad9c14cf885561c0b740a2
  1. ecc_test/
  2. scripts/
  3. test/
  4. .gitignore
  5. asm_arm.inc
  6. asm_avr.inc
  7. emk_project.py
  8. emk_rules.py
  9. LICENSE.txt
  10. README.md
  11. uECC.c
  12. uECC.h
README.md

micro-ecc

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

The old version of micro-ecc can be found in the “old” 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 4 standard curves: secp160r1, secp192r1, 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. uECC_make_key(), uECC_shared_secret(), uECC_sign(), and uECC_verify() only handle uncompressed points; you can 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) uECC.h, uECC.c, and the appropriate asm_<arch>_.inc (if any) into your project. Then just #include "uECC.h" to use the micro-ecc functions.

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).
  • When compiling for a Thumb-1 platform with inline assembly enabled (ie, uECC_ASM is defined to uECC_asm_small or uECC_asm_fast), you must use the -fomit-frame-pointer GCC option (this is enabled by default when compiling with -O1 or higher).
  • When compiling for AVR with inline assembly enabled, you must have optimizations enabled (compile with -O1 or higher).
  • When building on Windows, you will need to link in the advapi32.lib system library.