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+.\" $OpenBSD: RSA_meth_new.3,v 1.1 2018/03/18 13:06:36 schwarze Exp $
+.\" selective merge up to: OpenSSL a970b14f Jul 31 18:58:40 2017 -0400
+.\"
+.\" This file is a derived work.
+.\" The changes are covered by the following Copyright and license:
+.\"
+.\" Copyright (c) 2018 Ingo Schwarze <schwarze@openbsd.org>
+.\"
+.\" Permission to use, copy, modify, and distribute this software for any
+.\" purpose with or without fee is hereby granted, provided that the above
+.\" copyright notice and this permission notice appear in all copies.
+.\"
+.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+.\"
+.\" The original file was written by Richard Levitte <levitte@openssl.org>.
+.\" Copyright (c) 2016 The OpenSSL Project.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\"    software must display the following acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\"    endorse or promote products derived from this software without
+.\"    prior written permission. For written permission, please contact
+.\"    openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\"    nor may "OpenSSL" appear in their names without prior written
+.\"    permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\"    acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
+.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+.\" OF THE POSSIBILITY OF SUCH DAMAGE.
+.\"
+.Dd $Mdocdate: March 18 2018 $
+.Dt RSA_METH_NEW 3
+.Os
+.Sh NAME
+.Nm RSA_meth_new ,
+.Nm RSA_meth_free ,
+.Nm RSA_meth_dup ,
+.Nm RSA_meth_set_finish ,
+.Nm RSA_meth_set_priv_enc ,
+.Nm RSA_meth_set_priv_dec
+.Nd build up RSA methods
+.Sh SYNOPSIS
+.In openssl/rsa.h
+.Ft RSA_METHOD *
+.Fo RSA_meth_new
+.Fa "const char *name"
+.Fa "int flags"
+.Fc
+.Ft void
+.Fo RSA_meth_free
+.Fa "RSA_METHOD *meth"
+.Fc
+.Ft RSA_METHOD *
+.Fo RSA_meth_dup
+.Fa "const RSA_METHOD *meth"
+.Fc
+.Ft int
+.Fo RSA_meth_set_finish
+.Fa "RSA_METHOD *meth"
+.Fa "int (*finish)(RSA *rsa)"
+.Fc
+.Ft int
+.Fo RSA_meth_set_priv_enc
+.Fa "RSA_METHOD *meth"
+.Fa "int (*priv_enc)(int flen, const unsigned char *from,\
+ unsigned char *to, RSA *rsa, int padding)"
+.Fc
+.Ft int
+.Fo RSA_meth_set_priv_dec
+.Fa "RSA_METHOD *meth"
+.Fa "int (*priv_dec)(int flen, const unsigned char *from,\
+ unsigned char *to, RSA *rsa, int padding)"
+.Fc
+.Sh DESCRIPTION
+The
+.Vt RSA_METHOD
+structure holds function pointers for custom RSA implementations.
+.Pp
+.Fn RSA_meth_new
+creates a new
+.Vt RSA_METHOD
+structure.
+A copy of the NUL-terminated
+.Fa name
+is stored in the new
+.Vt RSA_METHOD
+object.
+Any new
+.Vt RSA
+object constructed from this
+.Vt RSA_METHOD
+will have the given
+.Fa flags
+set by default.
+.Pp
+.Fn RSA_meth_dup
+creates a deep copy of
+.Fa meth .
+This might be useful for creating a new
+.Vt RSA_METHOD
+based on an existing one, but with some differences.
+.Pp
+.Fn RSA_meth_free
+destroys
+.Fa meth
+and frees any memory associated with it.
+.Pp
+.Fn RSA_meth_set_finish
+sets an optional function for destroying an
+.Vt RSA
+object.
+Unless
+.Fa finish
+is
+.Dv NULL ,
+it will be called from
+.Xr RSA_free 3 .
+It takes the same argument
+and is intended to do RSA implementation specific cleanup.
+The memory used by the
+.Vt RSA
+object itself should not be freed by the
+.Fa finish
+function.
+.Pp
+.Fn RSA_meth_set_priv_enc
+and
+.Fn RSA_meth_set_priv_dec
+set the functions used for private key encryption and decryption.
+These functions will be called from
+.Xr RSA_private_decrypt 3
+and
+.Xr RSA_private_encrypt 3
+and take the same parameters as those.
+.Sh RETURN VALUES
+.Fn RSA_meth_new
+and
+.Fn RSA_meth_dup
+return the newly allocated
+.Vt RSA_METHOD
+object or
+.Dv NULL
+on failure.
+.Pp
+All
+.Fn RSA_meth_set_*
+functions return 1 on success or 0 on failure.
+.Sh SEE ALSO
+.Xr RSA_new 3 ,
+.Xr RSA_private_decrypt 3 ,
+.Xr RSA_private_encrypt 3 ,
+.Xr RSA_set_method 3
+.Sh HISTORY
+These functions first appeared in OpenSSL 1.1.0
+and have been available since
+.Ox 6.3 .