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Cleanup after merge of PR

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John Newby 2019-08-15 12:55:08 +02:00
parent 3c6b1fae4c
commit 9347bee344
2 changed files with 17 additions and 13 deletions
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17
README.md
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@ -2,18 +2,25 @@
FFI (NIF) export of Ethereum's ecrecover for use from Erlang. FFI (NIF) export of Ethereum's ecrecover for use from Erlang.
### prerequisite: ### 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`) - a checked out copy of my fork of parity-ethereum (https://github.com/johnsnewby/parity-ethereum) checked out into this directory this is (i.e. it will be referenced as `./parity-ethereum`)
### to compile: ### to compile:
`cargo build` `cargo build`
## Erlang integration ## Erlang integration
The shared library uses NIF. Use the erlang file `sec/nifecrecover.erl` to use this: The shared library uses NIF. Use the erlang file `src/ecrecover.erl` to use this:
``` ```
c("src/ecrecover"). c("src/ecrecover").
Decoded = ecrecover:hexstr_to_bin("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03"). c("src/ecrecover_util").
ecrecover:ecrecover(Decoded). Decoded = ecrecover_util:hex_to_bin("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").
ecrecover:time_taken_to_execute(fun() -> ecrecover:ecrecover(Decoded) end). List = binary:bin_to_list(Decoded).
Hash = binary:list_to_bin(lists:sublist(List, 1, 32)).
Sig = binary:list_to_bin(lists:sublist(List, 64, 65)).
Input = <<Hash/binary, 0:(8*31), Sig/binary>>.
binary:bin_to_list(Input) == binary:bin_to_list(Decoded).
Result = ecrecover:recover(Hash, Sig).
Expected = ecrecover_util:hex_to_bin("000000000000000000000000c08b5542d177ac6686946920409741463a15dddb").
binary:bin_to_list(Result) == binary:bin_to_list(Expected). %% check result
``` ```

11
src/lib.rs
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@ -7,8 +7,8 @@ extern crate parity_bytes;
#[macro_use] #[macro_use]
extern crate rustler; extern crate rustler;
use ethcore_builtin::EcRecover;
use crate::ethcore_builtin::Implementation; use crate::ethcore_builtin::Implementation;
use ethcore_builtin::EcRecover;
use parity_bytes::BytesRef; use parity_bytes::BytesRef;
use rustler::*; use rustler::*;
@ -20,13 +20,10 @@ mod atoms {
rustler_export_nifs!( rustler_export_nifs!(
"ecrecover", "ecrecover",
[ [("recover_", 1, nif_ecrecover),],
("ecrecover", 1, nif_ecrecover),
],
Some(on_load) Some(on_load)
); );
#[no_mangle] #[no_mangle]
fn on_load(_env: Env, _load_info: Term) -> bool { fn on_load(_env: Env, _load_info: Term) -> bool {
true true
@ -36,8 +33,8 @@ pub fn nif_ecrecover<'a>(env: Env<'a>, args: &[Term<'a>]) -> Result<Term<'a>, Er
let input: Binary = args[0].decode()?; let input: Binary = args[0].decode()?;
let mut byte_ref = Vec::new(); let mut byte_ref = Vec::new();
let ecrecover = EcRecover {}; let ecrecover = EcRecover {};
let _result = match ecrecover.execute(input.as_slice(), let _result = match ecrecover.execute(input.as_slice(), &mut BytesRef::Flexible(&mut byte_ref))
&mut BytesRef::Fixed(&mut byte_ref)) { {
Ok(_) => (), Ok(_) => (),
Err(_e) => return Err(rustler::Error::Atom("ecrecover_failed")), Err(_e) => return Err(rustler::Error::Atom("ecrecover_failed")),
}; };