ecrecover

FFI export of Ethereum's ecrecover, with Erlang integration.

prerequisite:

• a checked out copy of my fork of parity-ethereum (https://github.com/johnsnewby/parity-ethereum) checked out in the same directory this is (i.e. it will be referenced as ../parity-ethereum)

to compile: cargo build make (automatically runs tests).

to test: make test (requires gcc)

(if you don't see Test passed then something went wrong).

Erlang integration

Ports version

The binary erl_ecrecover works with Erlang Ports to provice ecrecover to an Erlang process. The file src/ecrecover.erl has the necessary Erlang code. Run it like this:

Eshell V9.3  (abort with ^G)
1> c("src/ecrecover").
{ok,ecrecover}
2> ecrecover:start("./erl_ecrecover").
<0.68.0>
3> ecrecover:ecrecover("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").
"000000000000000000000000c08b5542d177ac6686946920409741463a15dddb"

You may test if from the command line using the file data/data/erl_ecrecover.input.bin, a failing test is in data/erl_ecrecover.input-fail.bin:

$ cat data/erl_ecrecover.input.bin | ./erl_ecrecover
@000000000000000000000000c08b5542d177ac6686946920409741463a15dddb$

NIF version

The shared library also supports NIF. Use the erlang file sec/nifecrecover.erl to use this:

c("src/nifecrecover").
Decoded = nifecrecover:hexstr_to_bin("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").
nifecrecover:ecrecover(Decoded).
nifecrecover:time_taken_to_execute(fun() -> nifecrecover:ecrecover(Decoded) end).