| commit | 4ae15e365b508332170b66e78f0202d97a842aab | [log] [tgz] |
|---|---|---|
| author | Ken MacKay <kmackay@gmail.com> | Sat Sep 19 15:00:59 2015 -0700 |
| committer | Ken MacKay <kmackay@gmail.com> | Mon Oct 12 21:29:57 2015 -0700 |
| tree | e7c234d6119c8231544277f6fdcb9c19af8e4b0f | |
| parent | 1341d3dce5077060bd4dfebf505a29edf1f481cb [diff] |
Updated so that private keys are always the correct length. Specifically, the private key for secp160r1 is now required to be 21 bytes. Added some comments about buffer sizes.
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.
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.
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.
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.
uECC_CURVE and uECC_ASM, 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_CURVE=uECC_secp256r1 or whatever).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).uECC_ASM is defined to uECC_asm_fast), you must use the -fomit-frame-pointer GCC option (this is enabled by default when compiling with -O1 or higher).-O1 or higher).advapi32.lib system library.All tests were built using gcc 4.8.2 with -O3, and were run on a Raspberry Pi B+. uECC_ASM was defined to uECC_asm_fast and ECC_SQUARE_FUNC was defined to 1 in all cases. All times are in milliseconds.
All tests were built using avr-gcc 4.8.1 with -Os, and were run on a 16 MHz ATmega256RFR2. Code size refers to the space used by micro-ecc code and data.
In these tests, uECC_ASM was defined to uECC_asm_fast and ECC_SQUARE_FUNC was defined to 1 in all cases.
In these tests, uECC_ASM was defined to uECC_asm_small and ECC_SQUARE_FUNC was defined to 0 in all cases.
In these tests, uECC_ASM was defined to uECC_asm_fast and ECC_SQUARE_FUNC was defined to 1 in all cases.
In these tests, uECC_ASM was defined to uECC_asm_small and ECC_SQUARE_FUNC was defined to 0 in all cases.