Reviewed-by: NShane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12574)

To be able to implement this, there was a need for the standard
EVP_PKEY_set1_, EVP_PKEY_get0_ and EVP_PKEY_get1_ functions for
ED25519, ED448, X25519 and X448, as well as the corresponding
EVP_PKEY_assign_ macros.  There was also a need to extend the list of
hard coded names that EVP_PKEY_is_a() recognise.

Along with this, OSSL_FUNC_keymgmt_load() are implemented for all
those key types.

The deserializers for these key types are all implemented generically,
in providers/implementations/serializers/deserializer_der2key.c.
Reviewed-by: NPaul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12544)

Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NShane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12410)

Reviewed-by: NMatt Caswell <matt@openssl.org>
Reviewed-by: NShane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/12410)

Reviewed-by: NShane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11710)

Moved some shared FFC code into the FFC files.
Added extra paramgen parameters for seed, gindex.
Fixed bug in ossl_prov util to print bignums.
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11303)

Provide EC serializers for text, pem and der.

EC parameters use ANS1 'CHOICE' - which means they are more embedded than other parameters used by
other KEY types (which normally have a SEQUENCE at the top level).
For this reason the ANS1_STRING type that was being passed around has been changed to a void so that the
code can still be shared with EC.

The EC serializer only supports named curves currently.

NOTE the serializer code assumes PKCS8 format - if the older encode methods are needed they will need to be
added in another PR. (Probably when deserialization is considered).

EVP_PKEY_key_fromdata_init was changed from using a keypair selection to all bits of a key. A side effect of this was
that the very restrictive checks in the ecx code needed to be relaxed as it was assuming all selection flags were non
optional. As this is not the case for any other key the code has been modified.

Fixed a bug in legacy_ctrl_str_to_params() - "ecdh_cofactor_mode" was being incorrectly converted to the wrong keyname.
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11107)

Provide serializers for X25519 and X448 for text, pem and der. There are
no parameter serializers because there are no parameters for these
algorithms.

Add some documentation about the various import/export types available
Add additional testing for the serializers
Reviewed-by: NShane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/11095)

Add a guard in a build.info file for no-dsa builds
Reviewed-by: NBernd Edlinger <bernd.edlinger@hotmail.de>
(Merged from https://github.com/openssl/openssl/pull/10644)

The new serializer code broke no-dh builds so we add some more guards to fix it.
Reviewed-by: NBernd Edlinger <bernd.edlinger@hotmail.de>
(Merged from https://github.com/openssl/openssl/pull/10644)

Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10394)

Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10394)

This also adds the missing accessor RSA_get0_pss_params(), so those
parameters can be included in the PKCS#8 data structure without
needing to know the inside of the RSA structure.
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10394)

To support generic output of public keys wrapped in a X509_PUBKEY,
additional PEM and i2d/d2i routines are added for that type.
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10394)

From providers/common/ to providers/implementations/
Reviewed-by: NMatt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/10088)