Update core_names.h fields and document most fields.

Renamed some values in core_names i.e Some DH specific names were changed to use DH instead of FFC.
Added some strings values related to RSA keys.
Moved set_params related docs out of EVP_PKEY_CTX_ctrl.pod into its own file.
Updated Keyexchange and signature code and docs.
Moved some common DSA/DH docs into a shared EVP_PKEY-FFC.pod.
Moved Ed25519.pod into EVP_SIGNATURE-ED25519.pod and reworked it.

Added some usage examples. As a result of the usage examples the following change was also made:
ec allows OSSL_PKEY_PARAM_USE_COFACTOR_ECDH as a settable gen parameter.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11610)

1 files changed, 58 insertions, 0 deletions

diff --git a/doc/man7/EVP_SIGNATURE-DSA.pod b/doc/man7/EVP_SIGNATURE-DSA.pod
new file mode 100644
index 0000000000..11fe500cb3
--- /dev/null
+++ b/doc/man7/EVP_SIGNATURE-DSA.pod
@@ -0,0 +1,58 @@
+=pod
+
+=head1 NAME
+
+EVP_SIGNATURE-DSA
+- The B<EVP_PKEY> DSA signature implementation
+
+=head1 DESCRIPTION
+
+Support for computing DSA signatures.
+See L<EVP_PKEY-DSA(7)> for information related to DSA keys.
+
+=head2 Signature Parameters
+
+The following signature parameters can be set using EVP_PKEY_CTX_set_params().
+This may be called after EVP_PKEY_sign_init() or EVP_PKEY_verify_init(),
+and before calling EVP_PKEY_sign() or EVP_PKEY_verify(). 
+
+=over 4
+
+=item "digest" (B<OSSL_SIGNATURE_PARAM_DIGEST>) <UTF8 string>
+
+=item "properties" (B<OSSL_SIGNATURE_PARAM_PROPERTIES>) <UTF8 string>
+
+The settable parameters are described in L<provider-signature(7)>.
+
+=back
+
+The following signature parameters can be retrieved using
+EVP_PKEY_CTX_get_params().
+
+=over 4
+
+=item "algorithm-id" (B<OSSL_SIGNATURE_PARAM_ALGORITHM_ID>) <octet string>
+
+=item "digest" (B<OSSL_SIGNATURE_PARAM_DIGEST>) <UTF8 string>
+
+The gettable parameters are described in L<provider-signature(7)>.
+
+=back
+
+=head1 SEE ALSO
+
+L<EVP_PKEY_CTX_set_params(3)>,
+L<EVP_PKEY_sign(3)>,
+L<EVP_PKEY_verify(3)>,
+L<provider-signature(7)>,
+
+=head1 COPYRIGHT
+
+Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
+
+Licensed under the Apache License 2.0 (the "License").  You may not use
+this file except in compliance with the License.  You can obtain a copy
+in the file LICENSE in the source distribution or at
+L<https://www.openssl.org/source/license.html>.
+
+=cut