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-.\" $OpenBSD: EVP_PKEY_CTX_ctrl.3,v 1.28 2024/12/10 14:54:20 schwarze Exp $
-.\" full merge up to: OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
-.\" selective merge up to: OpenSSL 24a535ea Sep 22 13:14:20 2020 +0100
-.\" Parts were split out into RSA_pkey_ctx_ctrl(3).
-.\"
-.\" This file is a derived work.
-.\" The changes are covered by the following Copyright and license:
-.\"
-.\" Copyright (c) 2019, 2023, 2024 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 Dr. Stephen Henson <steve@openssl.org>
-.\" and Antoine Salon <asalon@vmware.com>.
-.\" Copyright (c) 2006, 2009, 2013, 2014, 2015, 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,
-.\" 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: December 10 2024 $
-.Dt EVP_PKEY_CTX_CTRL 3
-.Os
-.Sh NAME
-.Nm EVP_PKEY_CTX_ctrl ,
-.Nm EVP_PKEY_CTX_ctrl_str ,
-.Nm EVP_PKEY_CTX_set_signature_md ,
-.Nm EVP_PKEY_CTX_get_signature_md ,
-.Nm EVP_PKEY_CTX_set_dsa_paramgen_bits ,
-.Nm EVP_PKEY_CTX_set_dh_paramgen_prime_len ,
-.Nm EVP_PKEY_CTX_set_dh_paramgen_generator ,
-.Nm EVP_PKEY_CTX_set_ec_paramgen_curve_nid ,
-.Nm EVP_PKEY_CTX_set_ec_param_enc ,
-.Nm EVP_PKEY_CTX_set_ecdh_cofactor_mode ,
-.Nm EVP_PKEY_CTX_get_ecdh_cofactor_mode ,
-.Nm EVP_PKEY_CTX_set_ecdh_kdf_type ,
-.Nm EVP_PKEY_CTX_get_ecdh_kdf_type ,
-.Nm EVP_PKEY_CTX_set_ecdh_kdf_md ,
-.Nm EVP_PKEY_CTX_get_ecdh_kdf_md ,
-.Nm EVP_PKEY_CTX_set_ecdh_kdf_outlen ,
-.Nm EVP_PKEY_CTX_get_ecdh_kdf_outlen ,
-.Nm EVP_PKEY_CTX_set0_ecdh_kdf_ukm ,
-.Nm EVP_PKEY_CTX_get0_ecdh_kdf_ukm ,
-.Nm EVP_PKEY_CTX_set1_id ,
-.Nm EVP_PKEY_CTX_get1_id ,
-.Nm EVP_PKEY_CTX_get1_id_len
-.Nd algorithm specific control operations
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Ft int
-.Fo EVP_PKEY_CTX_ctrl
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "int keytype"
-.Fa "int optype"
-.Fa "int cmd"
-.Fa "int p1"
-.Fa "void *p2"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_ctrl_str
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "const char *type"
-.Fa "const char *value"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_set_signature_md
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "const EVP_MD *md"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_get_signature_md
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "const EVP_MD **pmd"
-.Fc
-.In openssl/dsa.h
-.Ft int
-.Fo EVP_PKEY_CTX_set_dsa_paramgen_bits
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "int nbits"
-.Fc
-.In openssl/dh.h
-.Ft int
-.Fo EVP_PKEY_CTX_set_dh_paramgen_prime_len
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "int len"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_set_dh_paramgen_generator
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "int gen"
-.Fc
-.In openssl/ec.h
-.Ft int
-.Fo EVP_PKEY_CTX_set_ec_paramgen_curve_nid
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "int nid"
-.Fc
-.Fa int
-.Fo EVP_PKEY_CTX_set_ec_param_enc
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "int param_enc"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_set_ecdh_cofactor_mode
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "int cofactor_mode"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_get_ecdh_cofactor_mode
-.Fa "EVP_PKEY_CTX *ctx"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_set_ecdh_kdf_type
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "int kdf"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_get_ecdh_kdf_type
-.Fa "EVP_PKEY_CTX *ctx"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_set_ecdh_kdf_md
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "const EVP_MD *md"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_get_ecdh_kdf_md
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "const EVP_MD **pmd"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_set_ecdh_kdf_outlen
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "int len"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_get_ecdh_kdf_outlen
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "int *plen"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_set0_ecdh_kdf_ukm
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "unsigned char *ukm"
-.Fa "int len"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_get0_ecdh_kdf_ukm
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "unsigned char **pukm"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_set1_id
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "void *id"
-.Fa "size_t id_len"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_get1_id
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "void *id"
-.Fc
-.Ft int
-.Fo EVP_PKEY_CTX_get1_id_len
-.Fa "EVP_PKEY_CTX *ctx"
-.Fa "size_t *pid_len"
-.Fc
-.Sh DESCRIPTION
-The function
-.Fn EVP_PKEY_CTX_ctrl
-sends a control operation to the context
-.Fa ctx .
-The key type used must match
-.Fa keytype
-if it is not -1.
-The parameter
-.Fa optype
-is a mask indicating which operations the control can be applied to.
-The control command is indicated in
-.Fa cmd
-and any additional arguments in
-.Fa p1
-and
-.Fa p2 .
-.Pp
-Applications will not normally call
-.Fn EVP_PKEY_CTX_ctrl
-directly but will instead call one of the algorithm specific macros
-described below and in
-.Xr RSA_pkey_ctx_ctrl 3 .
-.Pp
-The function
-.Fn EVP_PKEY_CTX_ctrl_str
-allows an application to send an algorithm specific control operation to
-a context
-.Fa ctx
-in string form.
-This is intended to be used for options specified on the command line or
-in text files.
-The commands supported are documented in the
-.Xr openssl 1
-utility command line pages for the option
-.Fl pkeyopt
-which is supported by the
-.Cm pkeyutl ,
-.Cm genpkey ,
-and
-.Cm req
-commands.
-.Pp
-All the remaining "functions" are implemented as macros.
-.Pp
-The
-.Fn EVP_PKEY_CTX_set_signature_md
-and
-.Fn EVP_PKEY_CTX_get_signature_md
-macros set and get the message digest type used in a signature.
-They can be used with the RSA, DSA, and ECDSA algorithms.
-If the key is of the type
-.Dv EVP_PKEY_RSA_PSS
-and has usage restrictions, an error occurs if an attempt is made
-to set the digest to anything other than the restricted value.
-.Pp
-These two macros expand to
-.Fn EVP_PKEY_CTX_ctrl
-with an
-.Fa optype
-of
-.Dv EVP_PKEY_OP_TYPE_SIG
-and the following command arguments:
-.Pp
-.Bl -column -compact EVP_PKEY_CTRL_GET_MD EVP_PKEY_CTX_get_signature_md()
-.It Fa cmd No constant      Ta corresponding macro
-.It Dv EVP_PKEY_CTRL_MD     Ta Fn EVP_PKEY_CTX_set_signature_md
-.It Dv EVP_PKEY_CTRL_GET_MD Ta Fn EVP_PKEY_CTX_get_signature_md
-.El
-.Ss DSA parameters
-The macro
-.Fn EVP_PKEY_CTX_set_dsa_paramgen_bits
-sets the number of bits used for DSA parameter generation to
-.Fa nbits .
-If not specified, 1024 is used.
-.Ss DH parameters
-The macro
-.Fn EVP_PKEY_CTX_set_dh_paramgen_prime_len
-sets the length of the DH prime parameter
-.Fa len
-for DH parameter generation.
-It only accepts lengths greater than or equal to 256.
-If this macro is not called, then 1024 is used.
-.Pp
-The
-.Fn EVP_PKEY_CTX_set_dh_paramgen_generator
-macro sets DH generator to
-.Fa gen
-for DH parameter generation.
-If not specified, 2 is used.
-.Ss EC parameters
-The
-.Fn EVP_PKEY_CTX_set_ec_paramgen_curve_nid
-macro sets the EC curve for EC parameter generation to
-.Fa nid .
-For EC parameter generation, this macro must be called or an error occurs
-because there is no default curve.
-.Pp
-The
-.Fn EVP_PKEY_CTX_set_ec_param_enc
-macro sets the EC parameter encoding to
-.Fa param_enc
-when generating EC parameters or an EC key.
-The encoding can be set to 0 for explicit parameters or to
-.Dv OPENSSL_EC_NAMED_CURVE
-to use named curve form.
-.Ss ECDH parameters
-The
-.Fn EVP_PKEY_CTX_set_ecdh_cofactor_mode
-macro sets the cofactor mode to
-.Fa cofactor_mode
-for ECDH key derivation.
-Possible values are 1 to enable cofactor key derivation, 0 to disable
-it, or -1 to clear the stored cofactor mode and fall back to the
-private key cofactor mode.
-.Pp
-The
-.Fn EVP_PKEY_CTX_get_ecdh_cofactor_mode
-macro returns the cofactor mode for
-.Fa ctx
-used for ECDH key derivation.
-Possible return values are 1 when cofactor key derivation is enabled
-or 0 otherwise.
-.Ss ECDH key derivation function parameters
-The
-.Fn EVP_PKEY_CTX_set_ecdh_kdf_type
-macro sets the key derivation function type to
-.Fa kdf
-for ECDH key derivation.
-Possible values are
-.Dv EVP_PKEY_ECDH_KDF_NONE
-or
-.Dv EVP_PKEY_ECDH_KDF_X9_63
-which uses the key derivation specified in X9.63.
-When using key derivation, the
-.Fa kdf_md
-and
-.Fa kdf_outlen
-parameters must also be specified.
-.Pp
-The
-.Fn EVP_PKEY_CTX_get_ecdh_kdf_type
-macro returns the key derivation function type for
-.Fa ctx
-used for ECDH key derivation.
-Possible return values are
-.Dv EVP_PKEY_ECDH_KDF_NONE
-or
-.Dv EVP_PKEY_ECDH_KDF_X9_63 .
-.Pp
-The
-.Fn EVP_PKEY_CTX_set_ecdh_kdf_md
-macro sets the key derivation function message digest to
-.Fa md
-for ECDH key derivation.
-Note that X9.63 specifies that this digest should be SHA1,
-but OpenSSL tolerates other digests.
-.Pp
-The
-.Fn EVP_PKEY_CTX_get_ecdh_kdf_md
-macro gets the key derivation function message digest for
-.Fa ctx
-used for ECDH key derivation.
-.Pp
-The
-.Fn EVP_PKEY_CTX_set_ecdh_kdf_outlen
-macro sets the key derivation function output length to
-.Fa len
-for ECDH key derivation.
-.Pp
-The
-.Fn EVP_PKEY_CTX_get_ecdh_kdf_outlen
-macro gets the key derivation function output length for
-.Fa ctx
-used for ECDH key derivation.
-.Pp
-The
-.Fn EVP_PKEY_CTX_set0_ecdh_kdf_ukm
-macro sets the user key material to
-.Fa ukm
-for ECDH key derivation.
-This parameter is optional and corresponds to the shared info
-in X9.63 terms.
-The library takes ownership of the user key material, so the caller
-should not free the original memory pointed to by
-.Fa ukm .
-.Pp
-The
-.Fn EVP_PKEY_CTX_get0_ecdh_kdf_ukm
-macro gets the user key material for
-.Fa ctx .
-The return value is the user key material length.
-The resulting pointer is owned by the library and should not be
-freed by the caller.
-.Ss CMAC parameters
-Application programs normally implement CMAC as described in
-.Xr EVP_PKEY_new_CMAC_key 3
-and do not need the control commands documented here.
-.Pp
-Alternatively, the call to
-.Xr EVP_PKEY_new_CMAC_key 3
-can be replaced as follows,
-leaving the rest of the example code given there unchanged:
-.Pp
-.Bl -enum -width 2n -compact
-.It
-Create an empty
-.Vt EVP_PKEY_CTX
-object by passing the
-.Dv EVP_PKEY_CMAC
-constant to
-.Xr EVP_PKEY_CTX_new_id 3 .
-.It
-Initialize it with
-.Xr EVP_PKEY_keygen_init 3 .
-.It
-Select the block cipher by calling
-.Fn EVP_PKEY_CTX_ctrl
-with an
-.Fa optype
-of
-.Dv EVP_PKEY_OP_KEYGEN ,
-a
-.Fa cmd
-of
-.Dv EVP_PKEY_CTRL_CIPHER ,
-and
-.Fa p2
-pointing to an
-.Vt EVP_CIPHER
-object, which can be obtained from the functions in the CIPHER LISTING in
-.Xr EVP_EncryptInit 3 .
-The
-.Fa p1
-argument is ignored; passing 0 is recommended.
-.It
-Call
-.Fn EVP_PKEY_CTX_ctrl
-again with an
-.Fa optype
-of
-.Dv EVP_PKEY_OP_KEYGEN ,
-a
-.Fa cmd
-of
-.Dv EVP_PKEY_CTRL_SET_MAC_KEY ,
-.Fa p2
-pointing to the symmetric key, and
-.Fa p1
-specifying the length of the symmetric key in bytes.
-.It
-Extract the desired
-.Vt EVP_PKEY
-object using
-.Xr EVP_PKEY_keygen 3 ,
-making sure the
-.Fa ppkey
-argument points to a storage location containing a
-.Dv NULL
-pointer.
-.It
-Proceed with
-.Xr EVP_MD_CTX_new 3 ,
-.Xr EVP_DigestSignInit 3 ,
-and
-.Xr EVP_DigestSign 3
-as usual.
-.El
-.Ss HMAC parameters
-Application programs normally implement HMAC as described in
-.Xr EVP_PKEY_new_raw_private_key 3 .
-While it is possible to instead use
-.Dv EVP_PKEY_CTRL_SET_MAC_KEY
-directly, similar to the above description for CMAC,
-that is strongly discouraged.
-It's essentially what the deprecated function
-.Xr EVP_PKEY_new_mac_key 3
-does internally, and compared to the direct approach with
-.Xr EVP_PKEY_new_raw_private_key 3 ,
-it requires a lot of cumbersome and unnecessary work.
-.Ss Other parameters
-The
-.Fn EVP_PKEY_CTX_set1_id ,
-.Fn EVP_PKEY_CTX_get1_id ,
-and
-.Fn EVP_PKEY_CTX_get1_id_len
-macros manipulate a special identifier field used for some specific
-signature algorithms such as SM2.
-The
-.Fn EVP_PKEY_set1_id
-macro sets the ID to a copy of
-.Fa id
-with the length
-.Fa id_len .
-The caller can safely free the original memory pointed to by
-.Fa id .
-The
-.Fn EVP_PKEY_CTX_get1_id_len
-macro returns the length of the ID set via a previous call to
-.Fn EVP_PKEY_set1_id .
-That length is typically used to allocate memory for a subsequent call to
-.Fn EVP_PKEY_CTX_get1_id ,
-which copies the previously set ID into
-.Pf * Fa id .
-The caller is responsible for allocating sufficient memory for
-.Fa id
-before calling
-.Fn EVP_PKEY_CTX_get1_id .
-.Sh RETURN VALUES
-.Fn EVP_PKEY_CTX_ctrl
-and its macros return a positive value 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 SEE ALSO
-.Xr DH_new 3 ,
-.Xr EVP_DigestInit 3 ,
-.Xr EVP_PKEY_CTX_new 3 ,
-.Xr EVP_PKEY_decrypt 3 ,
-.Xr EVP_PKEY_derive 3 ,
-.Xr EVP_PKEY_encrypt 3 ,
-.Xr EVP_PKEY_get_default_digest_nid 3 ,
-.Xr EVP_PKEY_keygen 3 ,
-.Xr EVP_PKEY_sign 3 ,
-.Xr EVP_PKEY_verify 3 ,
-.Xr EVP_PKEY_verify_recover 3 ,
-.Xr RSA_pkey_ctx_ctrl 3
-.Sh HISTORY
-The functions
-.Fn EVP_PKEY_CTX_ctrl ,
-.Fn EVP_PKEY_CTX_ctrl_str ,
-.Fn EVP_PKEY_CTX_set_signature_md ,
-.Fn EVP_PKEY_CTX_set_dsa_paramgen_bits ,
-.Fn EVP_PKEY_CTX_set_dh_paramgen_prime_len ,
-.Fn EVP_PKEY_CTX_set_dh_paramgen_generator ,
-and
-.Fn EVP_PKEY_CTX_set_ec_paramgen_curve_nid
-first appeared in OpenSSL 1.0.0 and have been available since
-.Ox 4.9 .
-.Pp
-The functions
-.Fn EVP_PKEY_CTX_get_signature_md ,
-.Fn EVP_PKEY_CTX_set_ec_param_enc ,
-.Fn EVP_PKEY_CTX_set_ecdh_cofactor_mode ,
-.Fn EVP_PKEY_CTX_get_ecdh_cofactor_mode ,
-.Fn EVP_PKEY_CTX_set_ecdh_kdf_type ,
-.Fn EVP_PKEY_CTX_get_ecdh_kdf_type ,
-.Fn EVP_PKEY_CTX_set_ecdh_kdf_md ,
-.Fn EVP_PKEY_CTX_get_ecdh_kdf_md ,
-.Fn EVP_PKEY_CTX_set_ecdh_kdf_outlen ,
-.Fn EVP_PKEY_CTX_get_ecdh_kdf_outlen ,
-.Fn EVP_PKEY_CTX_set0_ecdh_kdf_ukm ,
-and
-.Fn EVP_PKEY_CTX_get0_ecdh_kdf_ukm
-first appeared in OpenSSL 1.0.2 and have been available since
-.Ox 6.6 .
-.Pp
-The functions
-.Fn EVP_PKEY_CTX_set1_id ,
-.Fn EVP_PKEY_CTX_get1_id ,
-and
-.Fn EVP_PKEY_CTX_get1_id_len
-first appeared in OpenSSL 1.1.1 and have been available since
-.Ox 6.6 .