=head1 NAME
-EVP_MD_meth_dup,
-EVP_MD_meth_new, EVP_MD_meth_free, EVP_MD_meth_set_input_blocksize,
+EVP_MD_meth_new, EVP_MD_meth_dup, EVP_MD_meth_free,
+EVP_MD_meth_set_input_blocksize,
EVP_MD_meth_set_result_size, EVP_MD_meth_set_app_datasize,
EVP_MD_meth_set_flags, EVP_MD_meth_set_init, EVP_MD_meth_set_update,
EVP_MD_meth_set_final, EVP_MD_meth_set_copy, EVP_MD_meth_set_cleanup,
EVP_MD_meth_get_flags, EVP_MD_meth_get_init, EVP_MD_meth_get_update,
EVP_MD_meth_get_final, EVP_MD_meth_get_copy, EVP_MD_meth_get_cleanup,
EVP_MD_meth_get_ctrl
-- Routines to build up EVP_MD methods
+- Routines to build up legacy EVP_MD methods
=head1 SYNOPSIS
routines.
EVP_MD_meth_new() creates a new B<EVP_MD> structure.
+These B<EVP_MD> structures are reference counted.
EVP_MD_meth_dup() creates a copy of B<md>.
-EVP_MD_meth_free() destroys a B<EVP_MD> structure.
+EVP_MD_meth_free() decrements the reference count for the B<EVP_MD> structure.
+If the reference count drops to 0 then the structure is freed.
EVP_MD_meth_set_input_blocksize() sets the internal input block size
for the method B<md> to B<blocksize> bytes.
=item EVP_MD_FLAG_ONESHOT
-This digest method can only handles one block of input.
+This digest method can only handle one block of input.
+
+=item EVP_MD_FLAG_XOF
+
+This digest method is an extensible-output function (XOF) and supports
+the B<EVP_MD_CTRL_XOF_LEN> control.
=item EVP_MD_FLAG_DIGALGID_NULL
EVP_MD_FLAG_DIGALGID_NULL, the latter will be overridden.>
Currently unused.
+=item EVP_MD_FLAG_FIPS
+
+This digest method is suitable for use in FIPS mode.
+Currently unused.
+
=back
EVP_MD_meth_set_init() sets the digest init function for B<md>.
-The digest init function is called by EVP_DigestInit(),
+The digest init function is called by EVP_Digest(), EVP_DigestInit(),
EVP_DigestInit_ex(), EVP_SignInit, EVP_SignInit_ex(), EVP_VerifyInit()
and EVP_VerifyInit_ex().
EVP_MD_meth_set_update() sets the digest update function for B<md>.
-The digest update function is called by EVP_DigestUpdate(),
+The digest update function is called by EVP_Digest(), EVP_DigestUpdate() and
EVP_SignUpdate().
EVP_MD_meth_set_final() sets the digest final function for B<md>.
-The digest final function is called by EVP_DigestFinal(),
+The digest final function is called by EVP_Digest(), EVP_DigestFinal(),
EVP_DigestFinal_ex(), EVP_SignFinal() and EVP_VerifyFinal().
EVP_MD_meth_set_copy() sets the function for B<md> to do extra
EVP_MD_CTX_free().
EVP_MD_meth_set_ctrl() sets the control function for B<md>.
+See L<EVP_MD_CTX_ctrl(3)> for the available controls.
EVP_MD_meth_get_input_blocksize(), EVP_MD_meth_get_result_size(),
EVP_MD_meth_get_app_datasize(), EVP_MD_meth_get_flags(),
=head1 HISTORY
The B<EVP_MD> structure was openly available in OpenSSL before version
-1.1. The functions described here were added in OpenSSL 1.1.
+1.1.
+The functions described here were added in OpenSSL 1.1.
+The B<EVP_MD> structure created with these functions became reference
+counted in OpenSSL 3.0.
=head1 COPYRIGHT
-Copyright 2015-2017 The OpenSSL Project Authors. All Rights Reserved.
+Copyright 2015-2018 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