# Updates:
## Hashing
- Added SpongeHasher class
- Can be used to accept any hash function as an argument
- Absorb and squeeze are now separated
- Memory management is now mostly done by SpongeHasher class, each hash
function only describes permutation kernels
## Tree builder
- Tree builder is now hash-agnostic.
- Tree builder now supports 2D input (matrices)
- Tree builder can now use two different hash functions for layer 0 and
compression layers
## Poseidon1
- Interface changed to classes
- Now allows for any alpha
- Now allows passing constants not in a single vector
- Now allows for any domain tag
- Constants are now released upon going out of scope
- Rust wrappers changed to Poseidon struct
## Poseidon2
- Interface changed to classes
- Constants are now released upon going out of scope
- Rust wrappers changed to Poseidon2 struct
## Keccak
- Added Keccak class which inherits SpongeHasher
- Now doesn't use gpu registers for storing states
To do:
- [x] Update poseidon1 golang bindings
- [x] Update poseidon1 examples
- [x] Fix poseidon2 cuda test
- [x] Fix poseidon2 merkle tree builder test
- [x] Update keccak class with new design
- [x] Update keccak test
- [x] Check keccak correctness
- [x] Update tree builder rust wrappers
- [x] Leave doc comments
Future work:
- [ ] Add keccak merkle tree builder externs
- [ ] Add keccak rust tree builder wrappers
- [ ] Write docs
- [ ] Add example
- [ ] Fix device output for tree builder
---------
Co-authored-by: Jeremy Felder <jeremy.felder1@gmail.com>
Co-authored-by: nonam3e <71525212+nonam3e@users.noreply.github.com>
# This PR
1. Adds C++ API
2. Renames a lot of API functions
3. Adds inplace poseidon2
4. Makes input const at all poseidon functions
5. Adds benchmark for poseidon2
