linuxkm: register ecdh.

[philljj]

Description

Registers wolfcrypt ecdh as a struct kpp_alg with linux kernel crypto (kpp == Key-agreement Protocol Primitives).

Supports p192, p256, p384. Note: there is no kernel ecdh p521 in crypto/ecdh.c at this time it seems.

cat /proc/crypto after loading:

name         : ecdh-nist-p384
driver       : ecdh-nist-p384-wolfcrypt
module       : libwolfssl
priority     : 10000
refcnt       : 1
selftest     : passed
internal     : no
type         : kpp

name         : ecdh-nist-p256
driver       : ecdh-nist-p256-wolfcrypt
module       : libwolfssl
priority     : 10000
refcnt       : 1
selftest     : passed
internal     : no
type         : kpp

name         : ecdh-nist-p192
driver       : ecdh-nist-p192-wolfcrypt
module       : libwolfssl
priority     : 10000
refcnt       : 1
selftest     : passed
internal     : no
type         : kpp

Building

Builds with:

• --enable-linuxkm-lkcapi-register=ecdh
• p192 requires --with-eccminsz=192 -DHAVE_ECC192

Build with -DWOLFKM_DEBUG_ECDH for debug logging.

Testing

wolfssl multitest scenarios:

• linuxkm-legacy-6.12-insmod
• linuxkm-noasm-insmod-crypto-fuzzer-extras
• linuxkm-aescbc-cryptonly-aesni-fips-dev-dyn-hash-LKCAPI-no-twc-insmod
• linuxkm-noasm-insmod-kmemleak
• linuxkm-aesni-LKCS-no-twc-insmod-ksanitize-6.1.73

[douzzer]

LGTM

tested with wolfssl-multi-test.sh ... 'linuxkm-6.12-all-.*' linuxkm-noasm-ksanitize-insmod linuxkm-noasm-insmod-kmemleak linuxkm-aesni-insmod-kmemleak check-source-text