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[api] Define NATIVE_LITTLE_ENDIAN for libsodium on all targets

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libsodium's autoconf-generated config normally sets NATIVE_LITTLE_ENDIAN,
but PlatformIO skips autoconf. Without this define, libsodium falls back
to byte-at-a-time load/store operations in poly1305 and chacha20 instead
of optimized 32-bit memcpy. This saves ~340 bytes of flash and improves
encryption/decryption throughput on every API noise packet.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
J. Nick Koston
2026-03-08 11:54:11 -10:00
co-authored by Claude Opus 4.6
parent ad5811280a
commit 34abc08f04
1 changed files with 12 additions and 0 deletions
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esphome/components/api/__init__.py
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@@ -453,6 +453,18 @@ async def to_code(config: ConfigType) -> None:
# and plaintext disabled. Only a factory reset can remove it.
cg.add_define("USE_API_PLAINTEXT")
cg.add_define("USE_API_NOISE")
# libsodium uses NATIVE_LITTLE_ENDIAN to enable optimized 32-bit
# load/store via memcpy instead of byte-at-a-time operations in
# poly1305 and chacha20.
if (
CORE.is_esp32
or CORE.is_esp8266
or CORE.is_rp2040
or CORE.is_bk72xx
or CORE.is_rtl87xx
or CORE.is_ln882x
):
cg.add_build_flag("-DNATIVE_LITTLE_ENDIAN")
cg.add_library("esphome/noise-c", "0.1.10")
else:
cg.add_define("USE_API_PLAINTEXT")