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-.\" $OpenBSD: EVP_PKEY_derive.3,v 1.8 2018/03/23 04:34:23 schwarze Exp $
-.\" full merge up to: OpenSSL 48e5119a Jan 19 10:49:22 2018 +0100
-.\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2006, 2009, 2013, 2018 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,
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-.\"
-.Dd $Mdocdate: March 23 2018 $
-.Dt EVP_PKEY_DERIVE 3
-.Os
-.Sh NAME
-.Nm EVP_PKEY_derive_init ,
-.Nm EVP_PKEY_derive_set_peer ,
-.Nm EVP_PKEY_derive
-.Nd derive public key algorithm shared secret
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Ft int
-.Fo EVP_PKEY_derive_init
-.Fa "EVP_PKEY_CTX *ctx"
-.Fc
-.Ft int
-.Fo EVP_PKEY_derive_set_peer
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "EVP_PKEY *peer"
-.Fc
-.Ft int
-.Fo EVP_PKEY_derive
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "unsigned char *key"
-.Fa "size_t *keylen"
-.Fc
-.Sh DESCRIPTION
-The
-.Fn EVP_PKEY_derive_init
-function initializes a public key algorithm context using key
-.Fa ctx->pkey
-for shared secret derivation.
-.Pp
-The
-.Fn EVP_PKEY_derive_set_peer
-function sets the peer key: this will normally be a public key.
-.Pp
-The
-.Fn EVP_PKEY_derive
-function derives a shared secret using
-.Fa ctx .
-If
-.Fa key
-is
-.Dv NULL ,
-then the maximum size of the output buffer is written to the
-.Fa keylen
-parameter.
-If
-.Fa key
-is not
-.Dv NULL
-then before the call the
-.Fa keylen
-parameter should contain the length of the
-.Fa key
-buffer.
-If the call is successful, the shared secret is written to
-.Fa key
-and the amount of data written to
-.Fa keylen .
-.Pp
-After the call to
-.Fn EVP_PKEY_derive_init ,
-algorithm specific control operations can be performed to set any
-appropriate parameters for the operation.
-.Pp
-The function
-.Fn EVP_PKEY_derive
-can be called more than once on the same context if several operations
-are performed using the same parameters.
-.Sh RETURN VALUES
-.Fn EVP_PKEY_derive_init
-and
-.Fn EVP_PKEY_derive
-return 1 for success and 0 or a negative value for failure.
-In particular, a return value of -2 indicates the operation is not
-supported by the public key algorithm.
-.Sh EXAMPLES
-Derive shared secret (for example DH or EC keys):
-.Bd -literal -offset indent
-#include <openssl/evp.h>
-#include <openssl/rsa.h>
-
-EVP_PKEY_CTX *ctx;
-ENGINE *eng;
-unsigned char *skey;
-size_t skeylen;
-EVP_PKEY *pkey, *peerkey;
-
-/* Assumes that pkey, eng, and peerkey have already been set up. */
-ctx = EVP_PKEY_CTX_new(pkey, eng);
-if (!ctx)
-        /* Error occurred */
-if (EVP_PKEY_derive_init(ctx) <= 0)
-        /* Error */
-if (EVP_PKEY_derive_set_peer(ctx, peerkey) <= 0)
-        /* Error */
-
-/* Determine buffer length */
-if (EVP_PKEY_derive(ctx, NULL, &skeylen) <= 0)
-        /* Error */
-
-skey = malloc(skeylen);
-
-if (!skey)
-        /* malloc failure */
-
-if (EVP_PKEY_derive(ctx, skey, &skeylen) <= 0)
-        /* Error */
-
-/* Shared secret is skey bytes written to buffer skey */
-.Ed
-.Sh SEE ALSO
-.Xr EVP_PKEY_CTX_new 3 ,
-.Xr EVP_PKEY_decrypt 3 ,
-.Xr EVP_PKEY_encrypt 3 ,
-.Xr EVP_PKEY_meth_set_derive 3 ,
-.Xr EVP_PKEY_sign 3 ,
-.Xr EVP_PKEY_verify 3 ,
-.Xr EVP_PKEY_verify_recover 3 ,
-.Xr X25519 3
-.Sh HISTORY
-.Fn EVP_PKEY_derive_init ,
-.Fn EVP_PKEY_derive_set_peer ,
-and
-.Fn EVP_PKEY_derive
-first appeared in OpenSSL 1.0.0 and have been available since
-.Ox 4.9 .