From b3ad5a8f744c1291dacd8581cda57a335e203193 Mon Sep 17 00:00:00 2001 From: Bryan Newbold Date: Wed, 18 Oct 2017 16:52:08 -0700 Subject: refactor modules/files --- src/register.rs | 444 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 444 insertions(+) create mode 100644 src/register.rs (limited to 'src/register.rs') diff --git a/src/register.rs b/src/register.rs new file mode 100644 index 0000000..7aa4c23 --- /dev/null +++ b/src/register.rs @@ -0,0 +1,444 @@ + +use std::io::prelude::*; +use std::fs::File; +use std::path::Path; +use std::io::SeekFrom; +use integer_encoding::FixedInt; +use std::fs::OpenOptions; +use crypto::blake2b::Blake2b; +use crypto::digest::Digest; +use crypto::ed25519; +use rand::{Rng, OsRng}; + +use errors::*; +use sleep::*; + +/// Abstract access to Hypercore register +pub trait HyperRegister { + + /// Whether the register store contains the given (data) entry + fn has(&self, index: u64) -> Result; + + /// Whether the register store contains *all* known (data) entries + fn has_all(&self) -> Result; + + /// If the contiguous range of entries is in the store + fn has_range(&self, start: u64, end: u64) -> Result; + + /// Reads a single data entry from the store. + fn get_data_entry(&mut self, index: u64) -> Result>; + + /// Writes an entry to the store. Requires the private key to be present. + fn append(&mut self, data: &[u8]) -> Result; + + /// Count of data entries for this register. This is the total count (highest entry index plus + /// one); this particular store might be sparse. + fn len(&self) -> Result; + + /// Total size of this register in bytes. + fn len_bytes(&mut self) -> Result; + + /// [UNIMPLEMENTED] Intended to do a deeper merkel-tree verification of all stored data + fn verify(&mut self) -> Result<()>; + + /// Quick sanity checks on register store robust-ness + fn check(&mut self) -> Result<()>; + + /// Can this register be appended to? + fn writable(&self) -> bool; + + /// Returns a single tree entry (using tree indexing, not data indexing). + fn get_tree_entry(&mut self, index: u64) -> Result>; +} + +impl HyperRegister { + + fn hash_leaf(data: &[u8]) -> [u8; 40] { + let mut buf = [0; 40]; + u64::to_be(data.len() as u64) + .encode_fixed(&mut buf[32..40]); + let mut hash = Blake2b::new(32); + hash.input(&[0; 1]); + hash.input(&buf[32..40]); + hash.input(&data); + hash.result(&mut buf[0..32]); + buf + } + + fn hash_parent(lhash: &[u8; 40], rhash: &[u8; 40]) -> [u8; 40] { + let mut buf = [0; 40]; + // TODO: check overflow + let sum_size = u64::from_be(FixedInt::decode_fixed(&lhash[32..40])) + + u64::from_be(FixedInt::decode_fixed(&rhash[32..40])); + u64::to_be(sum_size as u64) + .encode_fixed(&mut buf[32..40]); + + let mut hash = Blake2b::new(32); + hash.input(&[1; 1]); + hash.input(&buf[32..40]); + hash.input(&lhash[..]); + hash.input(&rhash[..]); + hash.result(&mut buf[0..32]); + buf + } + + pub fn hash_roots(reg: &mut HyperRegister, index: u64) -> Result> { + let mut buf = [0; 40]; + let mut hash = Blake2b::new(32); + let mut index_buf = [0; 8]; + hash.input(&[2; 1]); + for ri in HyperRegister::root_nodes(index) { + u64::to_be(ri).encode_fixed(&mut index_buf); + let node = reg.get_tree_entry(ri)?; + hash.input(&node[0..32]); + hash.input(&index_buf); + hash.input(&node[32..40]); + } + hash.result(&mut buf[0..32]); + Ok(buf.to_vec()) + + } + + fn root_nodes(data_count: u64) -> Vec { + // Calculates the root notes for a given length (of data entries, not tree entries) + // TODO: this should be an iterator + // NB: this is a relatively "hot" function, gets called (repeatedly?) on every mutation, + // and potentially in inner loops of lookups. + if data_count == 0 { + return vec![]; + } + + // Convert the count to a (descending) list of power-of-2 components + let mut x = 0; + let mut components = vec![]; + while 2u64.pow(x) <= data_count { + if (data_count & 2u64.pow(x)) != 0 { + components.push(2u64.pow(x)); + } + x += 1; + } + components.reverse(); + + // Add and accumulate + let mut accum = 0; + let mut roots = vec![]; + for x in components { + roots.push(accum + (x - 1)); + accum += 2*x; + } + roots + } + + pub fn get_data_offset(reg: &mut HyperRegister, index: u64) -> Result { + // TODO: this is a naive (linear) implementation + // log(N) would go up previous parent nodes (eg, use root_nodes()) + let mut sum: u64 = 0; + for i in 0..index { + let leaf = reg.get_tree_entry(i*2)?; + sum += u64::from_be(FixedInt::decode_fixed(&leaf[32..40])); + } + Ok(sum) + } +} + +#[test] +fn test_root_nodes() { + assert_eq!(HyperRegister::root_nodes(0), vec![]); + assert_eq!(HyperRegister::root_nodes(1), vec![0]); + assert_eq!(HyperRegister::root_nodes(2), vec![1]); + assert_eq!(HyperRegister::root_nodes(3), vec![1,4]); + assert_eq!(HyperRegister::root_nodes(4), vec![3]); + assert_eq!(HyperRegister::root_nodes(5), vec![3,8]); + assert_eq!(HyperRegister::root_nodes(6), vec![3,9]); + assert_eq!(HyperRegister::root_nodes(7), vec![3,9,12]); + assert_eq!(HyperRegister::root_nodes(8), vec![7]); +} + +/// Implementation of HyperRegister using a local directory of SLEEP files +#[derive(Debug)] +pub struct SleepDirRegister { + tree_sleep: SleepFile, + sign_sleep: SleepFile, + bitfield_sleep: SleepFile, + data_file: Option, + // Except, these should be Ed25519 keys, not bytes + pub_key: Vec, + secret_key: Option>, +} + +impl SleepDirRegister { + + pub fn open(directory: &Path, prefix: &str, writable: bool) -> Result { + // read public key from disk + let mut pub_key: Vec = vec![]; + { + let mut key_file = OpenOptions::new() + .read(true) + .write(false) + .open(directory.join(Path::new(&(prefix.to_owned() + ".key"))))?; + // TODO: check key length? + key_file.read_to_end(&mut pub_key)?; + } + let data_path = &(prefix.to_owned() + ".data"); + let data_path = Path::new(data_path); + let data_file = if data_path.is_file() { + Some(OpenOptions::new() + .read(true) + .write(writable) + .open(data_path)?) + } else { + None + }; + let tree_sleep = SleepFile::open( + &directory.join(Path::new(&(prefix.to_owned() + ".tree"))), writable)?; + let sign_sleep = SleepFile::open( + &directory.join(Path::new(&(prefix.to_owned() + ".signatures"))), writable)?; + let bitfield_sleep = SleepFile::open( + &directory.join(Path::new(&(prefix.to_owned() + ".bitfield"))), writable)?; + let mut sf = SleepDirRegister { + tree_sleep, + sign_sleep, + bitfield_sleep, + data_file, + pub_key, + secret_key: None, + }; + sf.check()?; + Ok(sf) + } + + /// In addition to what one would expect, also creates an Ed25519 key-pair using OsRng + pub fn create(directory: &Path, prefix: &str) -> Result { + let mut rand_seed = vec![0; 32]; + let mut rng = OsRng::new()?; + rng.fill_bytes(&mut rand_seed); + let (secret_key, pub_key) = ed25519::keypair(&rand_seed); + println!("{:?}", directory.join(Path::new(&(prefix.to_owned() + ".key")))); + { + let mut key_file = OpenOptions::new() + .write(true) + .create_new(true) + .open(directory.join(Path::new(&(prefix.to_owned() + ".key"))))?; + key_file.write_all(&pub_key)?; + } + let data_file = OpenOptions::new() + .read(true) + .write(true) + .create_new(true) + .open(directory.join(Path::new(&(prefix.to_owned() + ".data"))))?; + let tree_sleep = SleepFile::create( + &directory.join(Path::new(&(prefix.to_owned() + ".tree"))), + 0x05025702, + 40, + Some("BLAKE2b".to_string()))?; + let sign_sleep = SleepFile::create( + &directory.join(Path::new(&(prefix.to_owned() + ".signatures"))), + 0x05025701, + 64, + Some("Ed25519".to_string()))?; + let bitfield_sleep = SleepFile::create( + &directory.join(Path::new(&(prefix.to_owned() + ".bitfield"))), + 0x05025700, + 3328, + None)?; + let mut sf = SleepDirRegister { + tree_sleep, + sign_sleep, + bitfield_sleep, + data_file: Some(data_file), + pub_key: pub_key.to_vec(), + secret_key: Some(secret_key.to_vec()), + }; + sf.check()?; + Ok(sf) + } +} + +impl HyperRegister for SleepDirRegister { + + fn has(&self, index: u64) -> Result { + // looks in bitfield + unimplemented!() + } + + fn has_all(&self) -> Result { + self.has_range(0, self.len()?) + } + + fn has_range(&self, start: u64, end: u64) -> Result { + // This function is un-motivated and could be removed + assert!(end > start); + for i in start..end { + if !self.has(i)? { + return Ok(false); + } + } + Ok(true) + } + + fn get_data_entry(&mut self, index: u64) -> Result> { + + // Get metadata about chunk (offset and length) + let offset = HyperRegister::get_data_offset(self, index)?; + + // Do we even have this chunk? + if !self.has(index)? { + bail!("Don't have that chunk"); + } + + let data_file = if let Some(ref mut df) = self.data_file { + df + } else { + bail!("No data file in this register"); + }; + let leaf = self.tree_sleep.read(index*2)?; + let data_len = u64::from_be(FixedInt::decode_fixed(&leaf[32..40])); + // TODO: avoid foot-gun in development: cap at ~1 billion bytes + assert!(data_len < 2u64.pow(29)); + + // Read chunk + let mut data = vec![0; data_len as usize]; + data_file.seek(SeekFrom::Start(offset))?; + data_file.read_exact(&mut data)?; + + // TODO: check the hash? separate function? + Ok(data) + } + + fn get_tree_entry(&mut self, index: u64) -> Result> { + self.tree_sleep.read(index) + } + + fn append(&mut self, data: &[u8]) -> Result { + + if !self.data_file.is_some() { + bail!("No data file in this register"); + }; + + let index = self.len()?; + // 1. Hash data chunk + let leaf_hash = HyperRegister::hash_leaf(data); + + // 2. Append data to data file + if let Some(ref mut df) = self.data_file { + df.seek(SeekFrom::End(0))?; + df.write_all(data)?; + df.sync_data()?; + } + + // 3. Add hash to tree file, update merkel tree + self.tree_sleep.write(index*2, &leaf_hash)?; + // TODO: tree_parent_index(u64) -> u64 function + // TODO: tree_child_entries(u64) function + + // 4. Add signature to signature file + let root_hash = HyperRegister::hash_roots(self, index+1)?; + let root_sig = ed25519::signature(&root_hash, &self.secret_key.clone().unwrap()); + self.sign_sleep.append(&root_sig)?; + + // 5. Update bitfile + Ok(index) + } + + fn len(&self) -> Result { + // Length in entry count. + let tree_len = self.tree_sleep.len()?; + if tree_len == 0 { + Ok(0) + } else if tree_len % 2 != 1 { + bail!("Even number of tree file SLEEP entries"); + } else { + Ok((self.tree_sleep.len()? / 2) + 1) + } + } + + fn len_bytes(&mut self) -> Result { + // TODO: this is a naive (linear) implementation + // log(N) would go up previous parent nodes (eg, use root_nodes()) + let mut sum: u64 = 0; + for i in 0..self.len()? { + let leaf = self.get_tree_entry(i*2)?; + sum += u64::from_be(FixedInt::decode_fixed(&leaf[32..40])); + } + Ok(sum) + } + + fn verify(&mut self) -> Result<()> { + unimplemented!() + } + + fn check(&mut self) -> Result<()> { + let sign_len = self.sign_sleep.len()?; + let tree_len = self.tree_sleep.len()?; + if (tree_len == 0) && (sign_len == 0) { + return Ok(()) + } + if tree_len != (sign_len * 2) - 1 { + bail!("Inconsistent SLEEP signature/tree file sizes"); + } + let computed = self.len_bytes()?; + if let Some(ref df) = self.data_file { + let file_size = df.metadata()?.len(); + if file_size != computed { + bail!("Computed vs. data file size mismatch"); + } + } + Ok(()) + } + + fn writable(&self) -> bool { + unimplemented!() + } +} + +#[test] +fn test_sdr_open() { + + let mut sdr = SleepDirRegister::open( + Path::new("test-data/dat/simple/.dat/"), "metadata", false).unwrap(); + + // Values from 'dat log' + assert_eq!(sdr.len().unwrap(), 3); + assert_eq!(sdr.len_bytes().unwrap(), 145); + + let mut sdr = SleepDirRegister::open( + Path::new("test-data/dat/simple/.dat/"), "content", false).unwrap(); + + // Values from 'dat log' + assert_eq!(sdr.len().unwrap(), 2); + assert_eq!(sdr.len_bytes().unwrap(), 204); +} + +#[test] +fn test_sdr_create() { + + use tempdir::TempDir; + + let tmp_dir = TempDir::new("geniza-test").unwrap(); + + let mut sdr = SleepDirRegister::create(tmp_dir.path(), "dummy").unwrap(); + + assert_eq!(sdr.len().unwrap(), 0); + assert_eq!(sdr.len_bytes().unwrap(), 0); +} + +#[test] +fn test_sdr_append() { + + use tempdir::TempDir; + + let tmp_dir = TempDir::new("geniza-test").unwrap(); + + let mut sdr = SleepDirRegister::create(tmp_dir.path(), "dummy").unwrap(); + + sdr.append("hello world!".as_bytes()).unwrap(); + sdr.check().unwrap(); + assert_eq!(sdr.len().unwrap(), 1); + assert_eq!(sdr.len_bytes().unwrap(), 12); + for i in 0..256 { + sdr.append(&[1,2,3,4,5]).unwrap(); + } + sdr.check().unwrap(); + assert_eq!(sdr.len().unwrap(), 1+256); + assert_eq!(sdr.len_bytes().unwrap(), 12 + (256*5)); +} -- cgit v1.2.3