41 lines
1.3 KiB
Markdown
41 lines
1.3 KiB
Markdown
# ecrecover
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FFI (NIF) export of Ethereum's ecrecover for use from Erlang.
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### Prerequisites
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The NIF is written in Rust, therefore the following additional build
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dependencies are needed:
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- Rust
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- Cargo
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- Cmake
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### Build
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Execute:
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```
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make
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```
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To disable the local build of the NIF library, e.g. to use a prebuilt binary,
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use the following command:
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```
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ECRECOVER_DISABLE_NIF_BUILD=true make
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```
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## Erlang integration
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The shared library uses NIF. Use the Erlang file `src/ecrecover.erl` to use this:
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```
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c("src/ecrecover").
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c("src/ecrecover_util").
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Decoded = ecrecover_util:hex_to_bin("47173285a8d7341e5e972fc677286384f802f8ef42a5ec5f03bbfa254cb01fad000000000000000000000000000000000000000000000000000000000000001b650acf9d3f5f0a2c799776a1254355d5f4061762a237396a99a0e0e3fc2bcd6729514a0dacb2e623ac4abd157cb18163ff942280db4d5caad66ddf941ba12e03").
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List = binary:bin_to_list(Decoded).
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Hash = binary:list_to_bin(lists:sublist(List, 1, 32)).
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Sig = binary:list_to_bin(lists:sublist(List, 64, 65)).
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Input = <<Hash/binary, 0:(8*31), Sig/binary>>.
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binary:bin_to_list(Input) == binary:bin_to_list(Decoded).
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Result = ecrecover:recover(Hash, Sig).
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Expected = ecrecover_util:hex_to_bin("000000000000000000000000c08b5542d177ac6686946920409741463a15dddb").
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binary:bin_to_list(Result) == binary:bin_to_list(Expected). %% check result
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```
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