86 lines
2.8 KiB
Rust
86 lines
2.8 KiB
Rust
extern crate phase2;
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extern crate pairing;
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extern crate rand;
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extern crate blake2_rfc;
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extern crate byteorder;
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#[macro_use]
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extern crate hex_literal;
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use std::fs::File;
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use std::io::{BufWriter, BufReader};
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use blake2_rfc::blake2b::Blake2b;
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fn main() {
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let current_params = File::open("params").expect("couldn't open `./params`");
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let mut current_params = BufReader::with_capacity(1024*1024, current_params);
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let new_params = File::create("new_params").expect("couldn't create `./new_params`");
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let mut new_params = BufWriter::with_capacity(1024*1024, new_params);
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let mut sapling_spend = phase2::MPCParameters::read(&mut current_params, false)
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.expect("couldn't deserialize Sapling Spend params");
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let mut sapling_output = phase2::MPCParameters::read(&mut current_params, false)
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.expect("couldn't deserialize Sapling Output params");
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let mut sprout_joinsplit = phase2::MPCParameters::read(&mut current_params, false)
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.expect("couldn't deserialize Sprout JoinSplit params");
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// Create an RNG based on the outcome of the random beacon
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let rng = &mut {
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use byteorder::{ReadBytesExt, BigEndian};
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use rand::{SeedableRng};
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use rand::chacha::ChaChaRng;
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// Place beacon value here (2^42 SHA256 hash of Bitcoin block hash #534861)
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let beacon_value: [u8; 32] = hex!("2bf41a959668e5b9b688e58d613b3dcc99ee159a880cf764ec67e6488d8b8af3");
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print!("Final result of beacon: ");
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for b in beacon_value.iter() {
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print!("{:02x}", b);
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}
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println!("");
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let mut digest = &beacon_value[..];
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let mut seed = [0u32; 8];
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for i in 0..8 {
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seed[i] = digest.read_u32::<BigEndian>().expect("digest is large enough for this to work");
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}
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ChaChaRng::from_seed(&seed)
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};
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let h1 = sapling_spend.contribute(rng);
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let h2 = sapling_output.contribute(rng);
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let h3 = sprout_joinsplit.contribute(rng);
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sapling_spend.write(&mut new_params).expect("couldn't write new Sapling Spend params");
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sapling_output.write(&mut new_params).expect("couldn't write new Sapling Spend params");
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sprout_joinsplit.write(&mut new_params).expect("couldn't write new Sapling Spend params");
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let mut h = Blake2b::new(64);
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h.update(&h1);
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h.update(&h2);
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h.update(&h3);
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let h = h.finalize();
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print!("Done!\n\n\
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Your contribution has been written to `./new_params`\n\n\
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The contribution you made is bound to the following hash:\n");
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for line in h.as_ref().chunks(16) {
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print!("\t");
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for section in line.chunks(4) {
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for b in section {
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print!("{:02x}", b);
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}
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print!(" ");
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}
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println!("");
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}
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println!("\n");
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}
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