Follow-up to #7731 ("Changes needed for default TLS support in zephyr
kernel"). Zephyr 4.3's TLS socket integration uses three additional
wolfSSL features that were not needed by the 3.7 integration, plus an
extension to the native_sim time-source gates introduced in #7731.
native_sim timer gates (src/internal.c, wolfcrypt/src/wc_port.c):
Extend the !CONFIG_BOARD_NATIVE_POSIX gate in LowResTimer() and the
CONFIG_BOARD_NATIVE_POSIX RTC path in z_time() to also cover
CONFIG_BOARD_NATIVE_SIM. Zephyr 4.3 renamed the simulator board from
native_posix to native_sim; without this, k_cpu_idle() on native_sim
advances simulated time during DTLS retransmit loops and the RTC path
falls through to uptime-since-boot. Behavior on native_posix is
unchanged.
New Kconfig options (zephyr/Kconfig, zephyr/user_settings.h):
CONFIG_WOLFSSL_SESSION_EXPORT -> HAVE_EXT_CACHE
Required by consumers that serialize TLS session state across
connections via wolfSSL_i2d_SSL_SESSION / wolfSSL_d2i_SSL_SESSION.
CONFIG_WOLFSSL_KEEP_PEER_CERT -> KEEP_PEER_CERT
Retain the peer certificate after handshake so the application
layer can inspect it via wolfSSL_get_peer_certificate.
CONFIG_WOLFSSL_ALWAYS_VERIFY_CB -> WOLFSSL_ALWAYS_VERIFY_CB
Invoke an application-set verify callback on successful chain
validation in addition to validation failures.
All three are default-off; customers opt in the same way they do for
the existing CONFIG_WOLFSSL_DTLS / ALPN / PSK feature options.
.wolfssl_known_macro_extras: register HAVE_EXT_CACHE.
Refactors the output format of generated assembly files across all
platforms
(x86_64, ARM AArch64, ARMv8-32, Thumb2, PowerPC) for consistency and
correctness.
Changes
Data constant consolidation
- Pack multiple values per directive line (e.g., 4× .long or 8× .short
per
line) instead of one value per line, reducing file sizes significantly
- Normalize hex literal formatting: 64-bit values use full 8-byte
zero-padded
form (e.g., 0x0000000003ffffff instead of 0x3ffffff)
x86_64 assembly
- Use decimal immediate values for shift counts (e.g., $1 instead of
$0x01)
- .asm (MASM): use hex notation consistently for data constants;
update ALIGN
values to match data width (e.g., ALIGN 32 for 256-bit aligned data)
ARM .S files
- Move .type directive before .section for data objects (correct
ordering per
ELF convention)
ARM/Thumb2 inline C (_c.c) files
- Replace asm( with __asm__( for register variable constraints (better
portability)
- Add XALIGNED(8) attribute to constant lookup tables used in inline
asm
- Remove redundant #include <stdint.h> and
<wolfssl/wolfcrypt/libwolfssl_sources.h> headers
Files affected: 71 assembly and companion C files across
wolfcrypt/src/,
wolfcrypt/src/port/arm/, covering AES, ChaCha, Poly1305,
SHA-256/512/3,
Curve25519, ML-KEM, ML-DSA, and SP math routines.
1. sp_cond_swap_ct_ex (line ~5524) — XOR typo: b->sign ^= b->sign always
zeroed the sign. Fixed to b->sign ^= t->sign to correctly swap signs.
2. sp_mod_d (line ~7271) — Negative modulo correction was applied even
when the remainder was 0. Added (*r != 0) guard to avoid producing d
instead of 0.
3. sp_lshb (line ~8444) — Left-shift size check was off. Refactored to
correctly distinguish between pure-digit shifts and bit-within-digit
shifts when checking if the result fits, using separate overflow checks
for each case.
4. _sp_mulmod_tmp (line ~12160) — Zero inputs caused an allocation of
size 0, which is problematic. Added an early path: if either operand is
zero, set result to zero and skip the allocation/multiply entirely.
5. sp_mod_2d — copy path (line ~14762) — XMEMCPY copied digits *
SP_WORD_SIZEOF bytes but a may have fewer than digits used digits. Fixed
to copy min(a->used, digits) digits to avoid reading uninitialized
memory.
6. sp_mod_2d — negation loop (line ~14782) — Negation loop iterated
over r->used, which could exceed digits. Fixed to loop over min(r->used,
digits).
7. _sp_sqrmod (line ~17314) — Same zero-input issue as _sp_mulmod_tmp.
Added early zero path to skip the allocation/squaring when input is
zero.
8. sp_lcm (line ~19838) — Typo in sign check: b->sign >= MP_NEG
(comparing against a value that is 1, so >= 1 would also match MP_ZPOS)
changed to b->sign == MP_NEG.
utilities for generic SetKey and ExportKey operations on HMAC, RSA, ECC,
and AES. Add wc_ecc_size/wc_ecc_sig_size callback hooks for hardware-only
keys. Integrate into configure.ac as --enable-cryptocbutils=setkey,export
options with CI test configurations in os-check.yml.
Add test handlers in test.c and api.c with export/import delegation
pattern, small-stack-safe allocations, custom curve support, and
DEBUG_CRYPTOCB helpers.
Colton Willey
Sean Parkinson
David Garske
Reda Chouk
Brett Nicholas
Jeremiah Mackey
Daniel Pouzzner
night1rider
Josh Holtrop
Marco Oliverio
Mattia Moffa
Kareem
Ruby Martin