[PATCH 0/7] crypto: add eddsa support for x509

[Hongbo Li <herbert.tencent@gmail.com>]

From: Hongbo Li <herberthbli@tencent.com>

This series of patches add support for x509 cert signed by eddsa,
which is described in RFC8032 [1], currently ed25519 only.

According to RFC8032 section 4 [2], there're two variants: PureEdDSA and
HashEdDSA. These patches support PureEdDSA which named Ed25519.

Patch1 fix a memory leak bug in sm2.

Patch2 fix a mpi_resize bug, this bug will cause eddsa verification failed.

Patch3 exports some mpi common functions.

Patch4 makes x509 layer support eddsa.

Patch5 moves some common code in sm2 to separate files. These code is also
       used by eddsa.

Patch6 is the implementation of eddsa verification according to RFC8032
       section 5.1.7 [3].

Patch7 adds test vector for eddsa.

Test by the following script:

keyctl newring test @u

while :; do
    certfile="cert.der"

    openssl req \
            -x509 \
            -newkey ED25519 \
            -keyout key.pem \
            -days 365 \
            -subj '/CN=test' \
            -nodes \
            -outform der \
            -out ${certfile} 2>/dev/null

    exp=0
    id=$(keyctl padd asymmetric testkey %keyring:test < "${certfile}")
    rc=$?
    if [ $rc -ne $exp ]; then
        case "$exp" in
            0) echo "Error: Could not load ed25519 certificate $certfile!";
        esac
        exit 1
    else
        case "$rc" in
            0) printf "load ed25519 cert keyid: %-10s\n" $id;
        esac
    fi
done

Best Regards

Hongbo

[1] https://datatracker.ietf.org/doc/html/rfc8032
[2] https://datatracker.ietf.org/doc/html/rfc8032#section-4
[3] https://datatracker.ietf.org/doc/html/rfc8032#section-5.1.7

Hongbo Li (7):
  crypto: fix a memory leak in sm2
  lib/mpi: use kcalloc in mpi_resize
  lib/mpi: export some common function
  x509: add support for eddsa
  crypto: move common code in sm2 to ec_mpi.c and ec_mpi.h
  crypto: support ed25519 x509 cert
  crypto: add eddsa test vector

 crypto/Kconfig                            |  15 ++++
 crypto/Makefile                           |   4 +
 crypto/asymmetric_keys/public_key.c       |  73 +++++++++++++--
 crypto/asymmetric_keys/x509_cert_parser.c |  14 ++-
 crypto/asymmetric_keys/x509_public_key.c  |   4 +-
 crypto/sm2.c                              | 104 +---------------------
 crypto/testmgr.c                          |   6 ++
 crypto/testmgr.h                          |  32 +++++++
 include/linux/oid_registry.h              |   1 +
 lib/mpi/mpi-add.c                         |   4 +-
 lib/mpi/mpiutil.c                         |   2 +-
 11 files changed, 146 insertions(+), 113 deletions(-)

-- 
2.27.0