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fuzzing

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Aravinth Manivannan 2021-06-19 21:05:43 +05:30
parent 8df560aaa8
commit 3399c62759
Signed by: realaravinth
GPG key ID: AD9F0F08E855ED88
5 changed files with 454 additions and 23 deletions
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4
fuzz/.gitignore vendored Normal file
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target
corpus
artifacts

377
fuzz/Cargo.lock generated Normal file
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28
fuzz/Cargo.toml Normal file
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@ -0,0 +1,28 @@
[package]
name = "pow_sha256-fuzz"
version = "0.0.0"
authors = ["Automatically generated"]
publish = false
edition = "2018"
[package.metadata]
cargo-fuzz = true
[dependencies]
libfuzzer-sys = "0.4"
sha2 = "0.9"
arbitrary = { version = "1", features = ["derive"] }
[dependencies.pow_sha256]
path = ".."
# Prevent this from interfering with workspaces
[workspace]
members = ["."]
[[bin]]
name = "fuzz_target_1"
path = "fuzz_targets/fuzz_target_1.rs"
test = false
doc = false

17
fuzz/fuzz_targets/fuzz_target_1.rs Normal file
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@ -0,0 +1,17 @@
#![no_main]
use libfuzzer_sys::fuzz_target;
use pow_sha256::dev::score;
use sha2::{Digest, Sha256};
#[derive(Clone, Debug, arbitrary::Arbitrary)]
struct Data {
salt: Vec<u8>,
message: Vec<u8>,
count: u64,
}
fuzz_target!(|data: Data| {
// fuzzed code goes here
let prefix_sha = Sha256::new().chain(&data.salt).chain(&data.message);
let _result = score(prefix_sha.clone(), data.count);
});

51
src/lib.rs
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@ -23,7 +23,7 @@
use std::marker::PhantomData; use std::marker::PhantomData;
use derive_builder::Builder; use derive_builder::Builder;
use num::Num; //use num::Num;
use serde::{Deserialize, Serialize}; use serde::{Deserialize, Serialize};
use sha2::{Digest, Sha256}; use sha2::{Digest, Sha256};
@ -73,7 +73,7 @@ impl Config {
let difficulty = get_difficulty(difficulty); let difficulty = get_difficulty(difficulty);
while result < difficulty { while result < difficulty {
n += 1; n += 1;
result = score(prefix_sha.clone(), n); result = dev::score(prefix_sha.clone(), n);
} }
PoW { PoW {
nonce: n, nonce: n,
@ -96,7 +96,7 @@ impl Config {
where where
T: Serialize, T: Serialize,
{ {
score(Sha256::new().chain(&self.salt).chain(target), pow.nonce) dev::score(Sha256::new().chain(&self.salt).chain(target), pow.nonce)
} }
/// Verifies that the PoW is indeed generated out of the phrase provided. /// Verifies that the PoW is indeed generated out of the phrase provided.
@ -128,27 +128,32 @@ impl Config {
} }
} }
fn score(prefix_sha: Sha256, nonce: u64) -> u128 { pub mod dev {
first_bytes_as_u128( use super::*;
prefix_sha
.chain(&nonce.to_be_bytes()) // to_be_bytes() converts to network endian
.finalize()
.as_slice(),
)
}
/// # Panics pub fn score(prefix_sha: Sha256, nonce: u64) -> u128 {
/// first_bytes_as_u128(
/// panics if inp.len() < 16 prefix_sha
fn first_bytes_as_u128(inp: &[u8]) -> u128 { .chain(&nonce.to_string()) //used to be: to_be_bytes() converts to network endian
use bincode::config::*; // chain() expexets something that can be converted to &[u8], String is fine
DefaultOptions::new() .finalize()
.with_fixint_encoding() .as_slice(),
.allow_trailing_bytes() )
.with_no_limit() }
.with_big_endian()
.deserialize(&inp) /// # Panics
.unwrap() ///
/// panics if inp.len() < 16
fn first_bytes_as_u128(inp: &[u8]) -> u128 {
use bincode::config::*;
DefaultOptions::new()
.with_fixint_encoding()
.allow_trailing_bytes()
.with_no_limit()
.with_big_endian()
.deserialize(&inp)
.unwrap()
}
} }
// utility function to get u128 difficulty factor from u32 // utility function to get u128 difficulty factor from u32