4 A small and fast ECDH and ECDSA implementation for 8-bit, 32-bit, and 64-bit processors.
6 The old version of micro-ecc can be found in the "old" branch.
11 * Resistant to known side-channel attacks.
12 * Written in C, with optional GCC inline assembly for AVR, ARM and Thumb platforms.
13 * Supports 8, 32, and 64-bit architectures.
15 * No dynamic memory allocation.
16 * Support for 4 standard curves: secp160r1, secp192r1, secp256r1, and secp256k1.
17 * BSD 2-clause license.
21 ### Point Representation ###
22 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.
24 Private keys are represented in the standard format.
26 ### Using the Code ###
28 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.
30 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).
32 See uECC.h for documentation for each function.
34 ### Compilation Notes ###
36 * Should compile with any C/C++ compiler that supports stdint.h (this includes Visual Studio 2013).
37 * If you want to change the defaults for `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).
38 * 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).
39 * When compiling for an ARM/Thumb-2 platform with fast inline assembly enabled (ie, `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).
40 * When compiling for AVR with inline assembly enabled, you must have optimizations enabled (compile with `-O1` or higher).
41 * When building for Windows, you will need to link in the `advapi32.lib` system library.
46 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.
57 <td><em>ECDH:</em></td>
64 <td><em>ECDSA sign:</em></td>
71 <td><em>ECDSA verify:</em></td>
82 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.
86 In these tests, `uECC_ASM` was defined to `uECC_asm_fast` and `ECC_SQUARE_FUNC` was defined to `1` in all cases.
97 <td><em>ECDH time (ms):</em></td>
104 <td><em>Code size (bytes):</em></td>
112 #### ECDH (small) ####
114 In these tests, `uECC_ASM` was defined to `uECC_asm_small` and `ECC_SQUARE_FUNC` was defined to `0` in all cases.
125 <td><em>ECDH time (ms):</em></td>
132 <td><em>Code size (bytes):</em></td>
140 #### ECDSA (fast) ####
142 In these tests, `uECC_ASM` was defined to `uECC_asm_fast` and `ECC_SQUARE_FUNC` was defined to `1` in all cases.
153 <td><em>ECDSA sign time (ms):</em></td>
160 <td><em>ECDSA verify time (ms):</em></td>
167 <td><em>Code size (bytes):</em></td>
175 #### ECDSA (small) ####
177 In these tests, `uECC_ASM` was defined to `uECC_asm_small` and `ECC_SQUARE_FUNC` was defined to `0` in all cases.
188 <td><em>ECDSA sign time (ms):</em></td>
195 <td><em>ECDSA verify time (ms):</em></td>
202 <td><em>Code size (bytes):</em></td>