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-.\"     $OpenBSD: evp.3,v 1.14 2019/08/25 17:08:20 schwarze Exp $
-.\"     OpenSSL a9c85cea Nov 11 09:33:55 2016 +0100
-.\"
-.\" This file was written by Ulf Moeller <ulf@openssl.org>,
-.\" Matt Caswell <matt@openssl.org>, Geoff Thorpe <geoff@openssl.org>,
-.\" and Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2000, 2002, 2006, 2013, 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: August 25 2019 $
-.Dt EVP 3
-.Os
-.Sh NAME
-.Nm evp
-.Nd high level cryptographic functions
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Sh DESCRIPTION
-The EVP library provides a high level interface to cryptographic
-functions.
-.Pp
-.Xr EVP_SealInit 3
-and
-.Xr EVP_OpenInit 3
-provide public key encryption and decryption to implement digital
-"envelopes".
-.Pp
-The
-.Xr EVP_DigestSignInit 3
-and
-.Xr EVP_DigestVerifyInit 3
-functions implement digital signatures and Message Authentication Codes
-(MACs).
-Also see the older
-.Xr EVP_SignInit 3
-and
-.Xr EVP_VerifyInit 3
-functions.
-.Pp
-Symmetric encryption is available with the
-.Xr EVP_EncryptInit 3
-functions.
-The
-.Xr EVP_DigestInit 3
-functions provide message digests.
-.Pp
-Authenticated encryption with additional data (AEAD) is available with
-the
-.Xr EVP_AEAD_CTX_init 3
-functions.
-.Pp
-The
-.Fn EVP_PKEY_*
-functions provide a high level interface to asymmetric algorithms.
-To create a new
-.Vt EVP_PKEY ,
-see
-.Xr EVP_PKEY_new 3 .
-.Vt EVP_PKEY Ns s
-can be associated with a private key of a particular algorithm
-by using the functions described in the
-.Xr EVP_PKEY_set1_RSA 3
-page, or new keys can be generated using
-.Xr EVP_PKEY_keygen 3 .
-.Vt EVP_PKEY Ns s
-can be compared using
-.Xr EVP_PKEY_cmp 3
-or printed using
-.Xr EVP_PKEY_print_private 3 .
-.Pp
-The
-.Fn EVP_PKEY_*
-functions support the full range of asymmetric algorithm operations:
-.Bl -bullet
-.It
-For key agreement, see
-.Xr EVP_PKEY_derive 3 .
-.It
-For signing and verifying, see
-.Xr EVP_PKEY_sign 3 ,
-.Xr EVP_PKEY_verify 3 ,
-and
-.Xr EVP_PKEY_verify_recover 3 .
-However, note that these functions do not perform a digest of the
-data to be signed.
-Therefore normally you would use the
-.Xr EVP_DigestSignInit 3
-functions for this purpose.
-.It
-For encryption and decryption see
-.Xr EVP_PKEY_encrypt 3
-and
-.Xr EVP_PKEY_decrypt 3 ,
-respectively.
-However, note that these functions perform encryption and decryption only.
-As public key encryption is an expensive operation, normally you
-would wrap an encrypted message in a digital envelope using the
-.Xr EVP_SealInit 3
-and
-.Xr EVP_OpenInit 3
-functions.
-.El
-.Pp
-The
-.Xr EVP_BytesToKey 3
-function provides some limited support for password based encryption.
-Careful selection of the parameters will provide a PKCS#5 PBKDF1
-compatible implementation.
-However, new applications should typically not use this (preferring, for
-example, PBKDF2 from PCKS#5).
-.Pp
-The
-.Xr EVP_EncodeInit 3
-family of functions provides base64 encoding and decoding.
-.Pp
-All the symmetric algorithms (ciphers), digests and asymmetric
-algorithms (public key algorithms) can be replaced by
-.Vt ENGINE
-modules providing alternative implementations; see
-.Xr ENGINE_register_RSA 3
-and the related manual pages for more information.
-If
-.Vt ENGINE
-implementations of ciphers or digests are registered as defaults,
-then the various EVP functions will automatically use those
-implementations in preference to built in software implementations.
-.Pp
-Although low level algorithm specific functions exist for many
-algorithms, their use is discouraged.
-They cannot be used with an
-.Vt ENGINE ,
-and
-.Vt ENGINE
-versions of new algorithms cannot be accessed using the low level
-functions.
-Using them also makes code harder to adapt to new algorithms, some
-options are not cleanly supported at the low level, and some
-operations are more efficient using the high level interfaces.
-.Sh SEE ALSO
-.Xr crypto 3 ,
-.Xr ENGINE_register_RSA 3 ,
-.Xr EVP_AEAD_CTX_init 3 ,
-.Xr EVP_aes_128_cbc 3 ,
-.Xr EVP_BytesToKey 3 ,
-.Xr EVP_camellia_128_cbc 3 ,
-.Xr EVP_des_cbc 3 ,
-.Xr EVP_DigestInit 3 ,
-.Xr EVP_DigestSignInit 3 ,
-.Xr EVP_EncodeInit 3 ,
-.Xr EVP_EncryptInit 3 ,
-.Xr EVP_OpenInit 3 ,
-.Xr EVP_PKEY_decrypt 3 ,
-.Xr EVP_PKEY_derive 3 ,
-.Xr EVP_PKEY_encrypt 3 ,
-.Xr EVP_PKEY_keygen 3 ,
-.Xr EVP_PKEY_new 3 ,
-.Xr EVP_PKEY_print_private 3 ,
-.Xr EVP_PKEY_set1_RSA 3 ,
-.Xr EVP_PKEY_sign 3 ,
-.Xr EVP_PKEY_verify 3 ,
-.Xr EVP_PKEY_verify_recover 3 ,
-.Xr EVP_rc4 3 ,
-.Xr EVP_SealInit 3 ,
-.Xr EVP_SignInit 3 ,
-.Xr EVP_sm3 3 ,
-.Xr EVP_sm4_cbc 3 ,
-.Xr EVP_VerifyInit 3 ,
-.Xr EVP_whirlpool 3