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-.\" $OpenBSD: EVP_CIPHER_CTX_ctrl.3,v 1.4 2025/03/25 11:54:34 tb Exp $
-.\" full merge up to: OpenSSL 5211e094 Nov 11 14:39:11 2014 -0800
-.\"
-.\" This file is a derived work.
-.\" The changes are covered by the following Copyright and license:
-.\"
-.\" Copyright (c) 2018, 2023 Ingo Schwarze <schwarze@openbsd.org>
-.\" Copyright (c) 2018 Damien Miller <djm@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 Dr. Stephen Henson <steve@openssl.org>.
-.\" Copyright (c) 2000, 2001, 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 25 2025 $
-.Dt EVP_CIPHER_CTX_CTRL 3
-.Os
-.Sh NAME
-.Nm EVP_CIPHER_CTX_ctrl ,
-.Nm EVP_CIPHER_CTX_set_padding ,
-.Nm EVP_CIPHER_CTX_set_key_length ,
-.Nm EVP_CIPHER_CTX_key_length ,
-.Nm EVP_CIPHER_key_length ,
-.Nm EVP_CIPHER_CTX_iv_length ,
-.Nm EVP_CIPHER_iv_length ,
-.Nm EVP_CIPHER_CTX_set_iv ,
-.Nm EVP_CIPHER_CTX_get_iv
-.Nd configure EVP cipher contexts
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Ft int
-.Fo EVP_CIPHER_CTX_ctrl
-.Fa "EVP_CIPHER_CTX *ctx"
-.Fa "int type"
-.Fa "int arg"
-.Fa "void *ptr"
-.Fc
-.Ft int
-.Fo EVP_CIPHER_CTX_set_padding
-.Fa "EVP_CIPHER_CTX *x"
-.Fa "int padding"
-.Fc
-.Ft int
-.Fo EVP_CIPHER_CTX_set_key_length
-.Fa "EVP_CIPHER_CTX *x"
-.Fa "int keylen"
-.Fc
-.Ft int
-.Fo EVP_CIPHER_CTX_key_length
-.Fa "const EVP_CIPHER_CTX *ctx"
-.Fc
-.Ft int
-.Fo EVP_CIPHER_key_length
-.Fa "const EVP_CIPHER *e"
-.Fc
-.Ft int
-.Fo EVP_CIPHER_CTX_iv_length
-.Fa "const EVP_CIPHER_CTX *ctx"
-.Fc
-.Ft int
-.Fo EVP_CIPHER_iv_length
-.Fa "const EVP_CIPHER *e"
-.Fc
-.Ft int
-.Fo EVP_CIPHER_CTX_set_iv
-.Fa "EVP_CIPHER_CTX *ctx"
-.Fa "const unsigned char *iv"
-.Fa "size_t len"
-.Fc
-.Ft int
-.Fo EVP_CIPHER_CTX_get_iv
-.Fa "const EVP_CIPHER_CTX *ctx"
-.Fa "unsigned char *iv"
-.Fa "size_t len"
-.Fc
-.Sh DESCRIPTION
-.Fn EVP_CIPHER_CTX_ctrl
-allows various cipher specific parameters to be determined and set.
-Currently only the RC2 effective key length can be set; see
-.Xr EVP_rc2_cbc 3
-for details.
-.Pp
-.Fn EVP_CIPHER_CTX_set_padding
-enables or disables padding.
-This function should be called after the context is set up for
-encryption or decryption with
-.Xr EVP_EncryptInit_ex 3 ,
-.Xr EVP_DecryptInit_ex 3 ,
-or
-.Xr EVP_CipherInit_ex 3 .
-By default encryption operations are padded using standard block padding
-and the padding is checked and removed when decrypting.
-If the
-.Fa padding
-parameter is zero, then no padding is performed, the total amount of data
-encrypted or decrypted must then be a multiple of the block size or an
-error will occur.
-.Pp
-.Fn EVP_CIPHER_CTX_set_key_length
-sets the key length of the cipher ctx.
-If the cipher is a fixed length cipher, then attempting to set the key
-length to any value other than the fixed value is an error.
-.Pp
-.Fn EVP_CIPHER_CTX_key_length
-and
-.Fn EVP_CIPHER_key_length
-return the key length of a cipher when passed an
-.Vt EVP_CIPHER_CTX
-or
-.Vt EVP_CIPHER
-structure.
-The constant
-.Dv EVP_MAX_KEY_LENGTH
-is the maximum key length for all ciphers.
-Note: although
-.Fn EVP_CIPHER_key_length
-is fixed for a given cipher, the value of
-.Fn EVP_CIPHER_CTX_key_length
-may be different for variable key length ciphers.
-.Pp
-.Fn EVP_CIPHER_CTX_iv_length
-and
-.Fn EVP_CIPHER_iv_length
-return the IV length of a cipher when passed an
-.Vt EVP_CIPHER_CTX
-or
-.Vt EVP_CIPHER .
-They will return zero if the cipher does not use an IV.
-.Fn EVP_CIPHER_CTX_iv_length
-can fail and return \-1.
-The constant
-.Dv EVP_MAX_IV_LENGTH
-is the maximum IV length for all ciphers.
-.Pp
-.Fn EVP_CIPHER_CTX_set_iv
-and
-.Fn EVP_CIPHER_CTX_get_iv
-set and retrieve the IV for an
-.Vt EVP_CIPHER_CTX ,
-respectively.
-In both cases, the specified IV length must exactly equal the expected
-IV length for the context as returned by
-.Fn EVP_CIPHER_CTX_iv_length .
-.Sh RETURN VALUES
-.Fn EVP_CIPHER_CTX_ctrl
-returns 1 for success or 0 for failure.
-Some implementations may return negative values for some errors.
-.Pp
-.Fn EVP_CIPHER_CTX_set_padding
-always returns 1.
-.Pp
-.Fn EVP_CIPHER_CTX_set_key_length ,
-.Fn EVP_CIPHER_CTX_set_iv ,
-and
-.Fn EVP_CIPHER_CTX_get_iv
-return 1 for success or 0 for failure.
-.Pp
-.Fn EVP_CIPHER_CTX_key_length
-and
-.Fn EVP_CIPHER_key_length
-return the key length.
-.Pp
-.Fn EVP_CIPHER_CTX_iv_length
-and
-.Fn EVP_CIPHER_iv_length
-return the IV length or zero if the cipher does not use an IV.
-.Fn EVP_CIPHER_CTX_iv_length
-can fail and return \-1.
-.Sh SEE ALSO
-.Xr evp 3 ,
-.Xr EVP_CIPHER_nid 3 ,
-.Xr EVP_EncryptInit 3
-.Sh HISTORY
-.Fn EVP_CIPHER_CTX_key_length ,
-.Fn EVP_CIPHER_key_length ,
-.Fn EVP_CIPHER_CTX_iv_length ,
-and
-.Fn EVP_CIPHER_iv_length
-first appeared in SSLeay 0.6.5 and have been available since
-.Ox 2.4 .
-.Pp
-.Fn EVP_CIPHER_CTX_ctrl
-and
-.Fn EVP_CIPHER_CTX_set_key_length
-first appeared in OpenSSL 0.9.6 and have been available since
-.Ox 2.9 .
-.Pp
-.Fn EVP_CIPHER_CTX_set_padding
-first appeared in OpenSSL 0.9.7 and has been available since
-.Ox 3.2 .
-.Pp
-.Fn EVP_CIPHER_CTX_set_iv
-and
-.Fn EVP_CIPHER_CTX_get_iv
-first appeared in LibreSSL 2.8.1 and have been available since
-.Ox 6.4 .
-.Sh BUGS
-.Dv EVP_MAX_KEY_LENGTH
-and
-.Dv EVP_MAX_IV_LENGTH
-only refer to the internal ciphers with default key lengths.
-If custom ciphers exceed these values, the results are unpredictable.
-This is because it has become standard practice to define a generic key
-as a fixed unsigned char array containing
-.Dv EVP_MAX_KEY_LENGTH
-bytes.