Awesome Rust Cryptography: Clarify Hybrid/PQC Categories + Add dcrypt

[NoCentralHub]

Hi RCIG team! quick suggestion to improve accuracy in the hybrid/PQC sections.

1. Distinguish classical hybrid encryption from PQ hybrid cryptography

Crates like:

• hpke, hpke-core
• ecies, ecies_25519
• rage/age

are classical hybrid encryption (ECDH + AEAD), but not post-quantum or PQ-classical hybrid schemes. A label separation would prevent confusion.

2. Mark PQClean-based crates as FFI

Crates like pqcrypto wrap PQClean (C). They are valuable, but not pure Rust. Worth labeling similar to other non-Rust backends.

3. Add category: Pure Rust Post-Quantum Cryptography

As of 2025, there is at least one production-grade, pure Rust PQC + hybrid implementation:

dcrypt (ioi-foundation/dcrypt)

• Pure Rust ML-KEM / ML-DSA
• Pure Rust P-256 / X25519
• Supports hybrid KEMs (ECDH + ML-KEM) and hybrid signatures
• Zero FFI, zero unsafe

This would fit cleanly under a “Pure Rust PQC” or “Hybrid PQ Cryptography” category.

Thanks for maintaining the list!

• HL 🃏