tiger: implement TTH hash algorithm

tiger/src/lib.rs

@@ -33,6 +33,8 @@
 #![forbid(unsafe_code)]
 #![warn(missing_docs, rust_2018_idioms)]
 
+extern crate alloc;
+
 pub use digest::{self, Digest};
 
 use core::fmt;
@@ -50,6 +52,9 @@ mod compress;
 mod tables;
 use compress::compress;
 
+mod tth;
+use tth::TigerTreeCore;
+
 type State = [u64; 3];
 const S0: State = [
     0x0123_4567_89AB_CDEF,
@@ -91,7 +96,7 @@ impl UpdateCore for TigerCore {
 impl FixedOutputCore for TigerCore {
     #[inline]
     fn finalize_fixed_core(&mut self, buffer: &mut Buffer<Self>, out: &mut Output<Self>) {
-        let bs = Self::BlockSize::U64 as u64;
+        let bs = Self::BlockSize::U64;
         let pos = buffer.get_pos() as u64;
         let bit_len = 8 * (pos + bs * self.block_len);
 
@@ -165,7 +170,7 @@ impl UpdateCore for Tiger2Core {
 impl FixedOutputCore for Tiger2Core {
     #[inline]
     fn finalize_fixed_core(&mut self, buffer: &mut Buffer<Self>, out: &mut Output<Self>) {
-        let bs = Self::BlockSize::U64 as u64;
+        let bs = Self::BlockSize::U64;
         let pos = buffer.get_pos() as u64;
         let bit_len = 8 * (pos + bs * self.block_len);
 
@@ -180,11 +185,7 @@ impl Default for Tiger2Core {
     fn default() -> Self {
         Self {
             block_len: 0,
-            state: [
-                0x0123_4567_89AB_CDEF,
-                0xFEDC_BA98_7654_3210,
-                0xF096_A5B4_C3B2_E187,
-            ],
+            state: S0,
         }
     }
 }
@@ -208,7 +209,9 @@ impl fmt::Debug for Tiger2Core {
     }
 }
 
-/// Tiger hasher state.
+/// Tiger hasher.
 pub type Tiger = CoreWrapper<TigerCore>;
-/// Tiger2 hasher state.
+/// Tiger2 hasher.
 pub type Tiger2 = CoreWrapper<Tiger2Core>;
+/// TTH hasher.
+pub type TigerTree = CoreWrapper<TigerTreeCore>;

tiger/src/tth.rs

@@ -0,0 +1,137 @@
+use crate::{Digest, Tiger, TigerCore};
+use alloc::vec::Vec;
+use core::fmt;
+use digest::{
+    core_api::{
+        AlgorithmName, Block, BlockSizeUser, Buffer, BufferKindUser, FixedOutputCore,
+        OutputSizeUser, Reset, UpdateCore,
+    },
+    typenum::Unsigned,
+    typenum::U1024,
+    HashMarker, Output,
+};
+
+/// Core Tiger hasher state.
+#[derive(Clone)]
+pub struct TigerTreeCore {
+    leaves: Vec<Output<TigerCore>>,
+    hasher: Tiger,
+    blocks_processed: usize,
+}
+
+impl Default for TigerTreeCore {
+    fn default() -> Self {
+        Self {
+            leaves: Vec::default(),
+            hasher: Tiger::new_with_prefix([LEAF_SIG]),
+            blocks_processed: 0,
+        }
+    }
+}
+
+type DataBlockSize = U1024;
+const LEAF_SIG: u8 = 0u8;
+const NODE_SIG: u8 = 1u8;
+/// The number of TigerCore blocks in a TigerTree data block
+const LEAF_BLOCKS: usize = DataBlockSize::USIZE / <TigerCore as BlockSizeUser>::BlockSize::USIZE;
+
+impl HashMarker for TigerTreeCore {}
+
+impl BlockSizeUser for TigerTreeCore {
+    type BlockSize = <TigerCore as BlockSizeUser>::BlockSize;
+}
+
+impl BufferKindUser for TigerTreeCore {
+    type BufferKind = <TigerCore as BufferKindUser>::BufferKind;
+}
+
+impl OutputSizeUser for TigerTreeCore {
+    type OutputSize = <TigerCore as OutputSizeUser>::OutputSize;
+}
+
+impl TigerTreeCore {
+    #[inline]
+    fn finalize_blocks(&mut self) {
+        let hasher = core::mem::replace(&mut self.hasher, Tiger::new_with_prefix([LEAF_SIG]));
+        let hash = hasher.finalize();
+        self.leaves.push(hash);
+        self.blocks_processed = 0;
+    }
+
+    #[inline]
+    fn update_block(&mut self, block: Block<Self>) {
+        self.hasher.update(block);
+        self.blocks_processed += 1;
+        if self.blocks_processed == LEAF_BLOCKS {
+            self.finalize_blocks();
+        }
+    }
+}
+
+impl UpdateCore for TigerTreeCore {
+    #[inline]
+    fn update_blocks(&mut self, blocks: &[Block<Self>]) {
+        for block in blocks {
+            self.update_block(*block);
+        }
+    }
+}
+
+impl FixedOutputCore for TigerTreeCore {
+    #[inline]
+    fn finalize_fixed_core(&mut self, buffer: &mut Buffer<Self>, out: &mut Output<Self>) {
+        if buffer.get_pos() > 0 {
+            self.hasher.update(buffer.get_data());
+            self.blocks_processed += 1;
+        }
+
+        if self.blocks_processed > 0 {
+            self.finalize_blocks()
+        }
+
+        let result = hash_nodes(self.leaves.as_slice());
+        out.copy_from_slice(&result);
+    }
+}
+
+#[inline]
+fn hash_nodes(hashes: &[Output<TigerCore>]) -> Output<TigerCore> {
+    match hashes.len() {
+        0 => hash_nodes(&[Tiger::digest([LEAF_SIG])]),
+        1 => hashes[0],
+        _ => {
+            let left_hashes = hashes.iter().step_by(2);
+
+            let right_hashes = hashes.iter().map(Some).skip(1).chain([None]).step_by(2);
+
+            let next_level_hashes: Vec<Output<TigerCore>> = left_hashes
+                .zip(right_hashes)
+                .map(|(left, right)| match right {
+                    Some(right) => Tiger::digest([&[NODE_SIG][..], left, right].concat()),
+                    None => *left,
+                })
+                .collect();
+
+            hash_nodes(next_level_hashes.as_slice())
+        }
+    }
+}
+
+impl Reset for TigerTreeCore {
+    #[inline]
+    fn reset(&mut self) {
+        *self = Default::default();
+    }
+}
+
+impl AlgorithmName for TigerTreeCore {
+    fn write_alg_name(f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str("TigerTree")
+    }
+}
+
+impl fmt::Debug for TigerTreeCore {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        f.write_str("TigerTreeCore { ... }")
+    }
+}

tiger/tests/mod.rs

@@ -1,7 +1,7 @@
 use digest::dev::{feed_rand_16mib, fixed_reset_test};
 use digest::new_test;
 use hex_literal::hex;
-use tiger::{Digest, Tiger, Tiger2};
+use tiger::{Digest, Tiger, Tiger2, TigerTree};
 
 new_test!(tiger, "tiger", tiger::Tiger, fixed_reset_test);
 new_test!(tiger2, "tiger2", tiger::Tiger2, fixed_reset_test);
@@ -25,3 +25,58 @@ fn tiger2_rand() {
         hex!("1bb7a80144c97f831fdefb635477776dd6c164048ce5895d")[..]
     );
 }
+
+#[test]
+fn tiger_empty() {
+    let mut h = Tiger::new();
+    h.update(b"");
+    assert_eq!(
+        h.finalize()[..],
+        hex!("3293ac630c13f0245f92bbb1766e16167a4e58492dde73f3")[..]
+    );
+}
+
+#[test]
+fn tth_empty() {
+    let mut h = TigerTree::new();
+    h.update(b"");
+    assert_eq!(
+        h.finalize()[..],
+        hex!("5d9ed00a030e638bdb753a6a24fb900e5a63b8e73e6c25b6")[..]
+    );
+}
+
+#[test]
+fn tth_one_block() {
+    let mut h = TigerTree::new();
+    let content = hex!("deadbeef");
+    h.update(content);
+    assert_eq!(
+        h.finalize()[..],
+        hex!("f527ab1ddbc4cced8572e0cf7a968604ebccb9414eb438dc")[..]
+    );
+}
+
+#[test]
+fn tth_two_blocks() {
+    let content = hex!("deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef");
+    assert!((1025..2049).contains(&content.len()));
+    let mut h = TigerTree::new();
+    h.update(content);
+    assert_eq!(
+        h.finalize()[..],
+        hex!("db67d9e452c3af6c329fb664737bc2378aa364b74c3468bb")[..]
+    );
+}
+
+#[test]
+fn tth_three_blocks() {
+    let content = hex!("deadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef8badf00d");
+    assert!((2049..3073).contains(&content.len()));
+    let mut h = TigerTree::new();
+    h.update(content);
+    assert_eq!(
+        h.finalize()[..],
+        hex!("f3a63c92019cffb7527e9adfa57a1ecb783728f67b06fed0")[..]
+    );
+}