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libsignal contains platform-agnostic APIs used by the official Signal clients
and servers, exposed as a Java, Swift, or TypeScript library.
The underlying implementations are written in Rust:
- libsignal-protocol: Implements the Signal protocol, including the
Double Ratchet algorithm. A replacement for libsignal-protocol-java and
libsignal-metadata-java.
- signal-crypto: Cryptographic primitives such as AES-GCM. We use RustCrypto's
where we can but sometimes have differing needs.
- device-transfer: Support logic for Signal's device-to-device transfer
feature.
- attest: Functionality for remote attestation of SGX enclaves and
server-side HSMs.
- zkgroup: Functionality for zero-knowledge groups and related features
available in Signal.
- poksho: Utilities for implementing zero-knowledge proofs (such as those used
by zkgroup); stands for "proof-of-knowledge, stateful-hash-object".
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