rust-bitcoin-unsafe-fast/fuzz/fuzz_targets/bitcoin/deserialize_script.rs

81 lines
2.5 KiB
Rust

use honggfuzz::fuzz;
use bitcoin::address::Address;
use bitcoin::network::constants::Network;
use bitcoin::blockdata::script;
use bitcoin::consensus::encode;
fn do_test(data: &[u8]) {
let s: Result<script::ScriptBuf, _> = encode::deserialize(data);
if let Ok(script) = s {
let _: Result<Vec<script::Instruction>, script::Error> = script.instructions().collect();
let mut b = script::Builder::new();
for ins in script.instructions_minimal() {
if ins.is_err() {
return;
}
match ins.ok().unwrap() {
script::Instruction::Op(op) => { b = b.push_opcode(op); }
script::Instruction::PushBytes(bytes) => {
// Any one-byte pushes, except -0, which can be interpreted as numbers, should be
// reserialized as numbers. (For -1 through 16, this will use special ops; for
// others it'll just reserialize them as pushes.)
if bytes.len() == 1 && bytes[0] != 0x80 && bytes[0] != 0x00 {
if let Ok(num) = script::read_scriptint(bytes.as_bytes()) {
b = b.push_int(num);
} else {
b = b.push_slice(bytes);
}
} else {
b = b.push_slice(bytes);
}
}
}
}
assert_eq!(b.into_script(), script);
assert_eq!(data, &encode::serialize(&script)[..]);
// Check if valid address and if that address roundtrips.
if let Ok(addr) = Address::from_script(&script, Network::Bitcoin) {
assert_eq!(addr.script_pubkey(), script);
}
}
}
fn main() {
loop {
fuzz!(|data| {
do_test(data);
});
}
}
#[cfg(test)]
mod tests {
fn extend_vec_from_hex(hex: &str, out: &mut Vec<u8>) {
let mut b = 0;
for (idx, c) in hex.as_bytes().iter().enumerate() {
b <<= 4;
match *c {
b'A'..=b'F' => b |= c - b'A' + 10,
b'a'..=b'f' => b |= c - b'a' + 10,
b'0'..=b'9' => b |= c - b'0',
_ => panic!("Bad hex"),
}
if (idx & 1) == 1 {
out.push(b);
b = 0;
}
}
}
#[test]
fn duplicate_crash() {
let mut a = Vec::new();
extend_vec_from_hex("00", &mut a);
super::do_test(&a);
}
}