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-.\"     $OpenBSD: EVP_SealInit.3,v 1.9 2023/11/16 20:27:43 schwarze Exp $
-.\"     OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
-.\"
-.\" This file was written by Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2000, 2002, 2003, 2005, 2015 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
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-.\"
-.Dd $Mdocdate: November 16 2023 $
-.Dt EVP_SEALINIT 3
-.Os
-.Sh NAME
-.Nm EVP_SealInit ,
-.Nm EVP_SealUpdate ,
-.Nm EVP_SealFinal
-.Nd EVP envelope encryption
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Ft int
-.Fo EVP_SealInit
-.Fa "EVP_CIPHER_CTX *ctx"
-.Fa "const EVP_CIPHER *type"
-.Fa "unsigned char **ek"
-.Fa "int *ekl"
-.Fa "unsigned char *iv"
-.Fa "EVP_PKEY **pubk"
-.Fa "int npubk"
-.Fc
-.Ft int
-.Fo EVP_SealUpdate
-.Fa "EVP_CIPHER_CTX *ctx"
-.Fa "unsigned char *out"
-.Fa "int *outl"
-.Fa "unsigned char *in"
-.Fa "int inl"
-.Fc
-.Ft int
-.Fo EVP_SealFinal
-.Fa "EVP_CIPHER_CTX *ctx"
-.Fa "unsigned char *out"
-.Fa "int *outl"
-.Fc
-.Sh DESCRIPTION
-The EVP envelope routines are a high level interface to envelope
-encryption.
-They generate a random key and IV (if required) then "envelope" it by
-using public key encryption.
-Data can then be encrypted using this key.
-.Pp
-.Fn EVP_SealInit
-initializes a cipher context
-.Fa ctx
-for encryption with cipher
-.Fa type
-using a random secret key and IV.
-.Fa type
-is normally supplied by a function such as
-.Xr EVP_aes_256_cbc 3 ;
-see
-.Xr EVP_EncryptInit 3
-for details.
-The secret key is encrypted using one or more public keys.
-This allows the same encrypted data to be decrypted using any of
-the corresponding private keys.
-.Fa ek
-is an array of buffers where the public key encrypted secret key will be
-written.
-Each buffer must contain enough room for the corresponding encrypted
-key: that is
-.Fa ek[i]
-must have room for
-.Fn EVP_PKEY_size pubk[i]
-bytes.
-The actual size of each encrypted secret key is written to the array
-.Fa ekl .
-.Fa pubk
-is an array of
-.Fa npubk
-public keys.
-.Pp
-The
-.Fa iv
-parameter is a buffer where the generated IV is written to.
-It must contain enough room for the corresponding cipher's IV, as
-determined by (for example)
-.Fn EVP_CIPHER_iv_length type .
-.Pp
-If the cipher does not require an IV then the
-.Fa iv
-parameter is ignored and can be
-.Dv NULL .
-.Pp
-.Fn EVP_SealUpdate
-and
-.Fn EVP_SealFinal
-have exactly the same properties as the
-.Xr EVP_EncryptUpdate 3
-and
-.Xr EVP_EncryptFinal 3
-routines.
-.Pp
-The public key must be RSA because it is the only OpenSSL public key
-algorithm that supports key transport.
-.Pp
-Envelope encryption is the usual method of using public key encryption
-on large amounts of data.
-This is because public key encryption is slow but symmetric encryption
-is fast.
-So symmetric encryption is used for bulk encryption and the small random
-symmetric key used is transferred using public key encryption.
-.Pp
-It is possible to call
-.Fn EVP_SealInit
-twice in the same way as
-.Xr EVP_EncryptInit 3 .
-The first call should have
-.Fa npubk
-set to 0 and (after setting any cipher parameters) it should be called
-again with
-.Fa type
-set to NULL.
-.Pp
-.Fn EVP_SealUpdate
-is implemented as a macro.
-.Sh RETURN VALUES
-.Fn EVP_SealInit
-returns 0 on error or
-.Fa npubk
-if successful.
-.Pp
-.Fn EVP_SealUpdate
-and
-.Fn EVP_SealFinal
-return 1 for success and 0 for failure.
-.Sh SEE ALSO
-.Xr evp 3 ,
-.Xr EVP_EncryptInit 3 ,
-.Xr EVP_OpenInit 3
-.Sh HISTORY
-.Fn EVP_SealInit ,
-.Fn EVP_SealUpdate ,
-and
-.Fn EVP_SealFinal
-first appeared in SSLeay 0.5.1 and have been available since
-.Ox 2.4 .
-.Pp
-.Fn EVP_SealFinal
-did not return a value before OpenSSL 0.9.7.