Comment # 4 on bug 1189283 from Fabian Vogt

af_alg and algif_hash are not enough, it prints an error message for various
algorithms...

[   42s] libkcapi - Error: AF_ALG: bind failed (errno: -2)
[   42s] libkcapi - Error: Netlink error: cannot open netlink socket
[   42s] libkcapi - Error: NETLINK_CRYPTO: cannot obtain cipher information for
hmac(sha1) (is required crypto_user.c patch missing? see documentation)
[   42s] libkcapi - Error: NETLINK_CRYPTO: cannot obtain cipher information for
hmac(sha256) (is required crypto_user.c patch missing? see documentation)
[   42s] libkcapi - Error: NETLINK_CRYPTO: cannot obtain cipher information for
hmac(sha384) (is required crypto_user.c patch missing? see documentation)
[   42s] libkcapi - Error: NETLINK_CRYPTO: cannot obtain cipher information for
hmac(sha512) (is required crypto_user.c patch missing? see documentation)
[   42s] libkcapi - Error: NETLINK_CRYPTO: cannot obtain cipher information for
sha1 (is required crypto_user.c patch missing? see documentation)
[   42s] libkcapi - Error: NETLINK_CRYPTO: cannot obtain cipher information for
sha256 (is required crypto_user.c patch missing? see documentation)
[   42s] libkcapi - Error: NETLINK_CRYPTO: cannot obtain cipher information for
sha384 (is required crypto_user.c patch missing? see documentation)
[   42s] libkcapi - Error: NETLINK_CRYPTO: cannot obtain cipher information for
sha512 (is required crypto_user.c patch missing? see documentation)

What's required exactly depends on the library user I suppose. So we'd
basically have to include all algorithms and their arch-specific optimized
implementations... The easiest way is to include and load all
$moduledir/kernel/crypto/* modules, maintaining a manual list can be annoying.