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wolfNano

A condensed, TLS 1.3-only embedded TLS library: the wolfSSL components you want for the smallest constrained devices, assembled into a plain-Makefile project (in the spirit of wolfCOSE and wolfIP), with true zero dynamic allocation and wolfSSL's assembly speedups intact.

wolfNano is a behavioral subset of wolfSSL. It never offers a primitive, group, cipher suite, or extension that wolfSSL lacks, it consumes wolfSSL as a pinned git submodule, and it never modifies that submodule. The shell reaches crypto only through a thin wc_* provider seam.

Pillars

• TLS 1.3 only, client-first, Raw Public Keys (RFC 7250) plus PSK by default. X.509 is a compile-time adder.
• True no-allocator: the shell and the src crypto floor use no allocator at all, only caller-provided or static buffers (the wolfCOSE bar).
• Provider seam selected at build time:
  • src (default, GPLv3): selected wolfcrypt/src/*.c from the submodule.
  • fips (commercial): links a customer-supplied wolfSSL FIPS bundle under the unchanged shell.
• Per-feature compile flags (WOLFNANO_HAVE_*). ML-KEM and ML-DSA are compile-out-able adders.
• Clean-room provenance: copy wolfSSL-family code verbatim, write everything else strictly from the RFC, never from third-party sources.

Current status

Early development, but the TLS 1.3 client works end to end.

• Done: the crypto floor (RFC KATs + wolfSSL's own crypto test, trimmed) with true no-allocator verified; the slim TLS 1.3 shell (key schedule, transcript, record protection, key share, ClientHello/ServerHello, handshake driver); side-channel hardening; and a live TLS 1.3 PSK+ECDHE handshake against both OpenSSL and wolfSSL.
• Done (PQC): ML-KEM-768 and ML-DSA-65 adders (both verify paths allocation-free) plus the X25519MLKEM768 hybrid key share.
• Done (cert auth): X.509 chain-link verify (ECC + RSA) and a cert-based TLS 1.3 handshake (ECDSA CertVerify) live against OpenSSL (WOLFNANO_X509, needs working memory).
• Next: the FIPS provider-seam build, benchmarks/positioning.
• Deferred: full multi-cert path validation, hardware/on-device asm benchmarks.

See Getting Started.