TFHE-rs v1.2.0

Summary

TFHE-rs v1.2.0 introduces the new HPU backend. The HPU (Homorphic Processing Unit) is a hardware accelerator for FHE operations.

What's Changed

Breaking changes

Warning

• The shortint ServerKey does not directly hold the bootstrapping and keyswitch keys anymore. Instead, they are stored inside a generic AtomicPatternServerKey object which allows to customize the content of the key materials.
• The conformance parameters for the integer ServerKey are now wrapped inside AtomicPatternParameters.

New features

HPU

• Add Hpu backend implementation

CPU

• Add back&forth NTT implementation
• Add support for dynamic atomic pattern at the shortint level. They allow to customize how lookup tables are evaluated.
• Add the KeySwitch32 atomic pattern
• Enable custom modulus generation for TUniform
• Add AsRef implementation on ServerKey to access NoiseSquashingKey
• Run ZK verification inside dedicated thread pools to redcuce the latency

GPU

• Implement ZK's expand
• Implement 128 bit classic CG PBS
• Add memory tracking functions for add, subtract, scalar add and scalar subtract
• Add necessary entry points for 128 bit compression
• Add circulant matrix for one vs many poly product

Fixes

CPU

• Fix success probability for Ternary Uniform generation
• Remove additional body coeff in multi bit ms compression
• Check that crs group element at index n is 0

GPU

• Update panic condition on upper bound for the number of cuda blocks to apply only to Thread Block Clusters
• Fix multi device execution with drift