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-.\" $OpenBSD: RSA_get0_key.3,v 1.8 2025/01/05 15:40:42 tb Exp $
-.\" selective merge up to: OpenSSL 665d899f Aug 2 02:19:43 2017 +0800
-.\"
-.\" This file is a derived work.
-.\" The changes are covered by the following Copyright and license:
-.\"
-.\" Copyright (c) 2019 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 Richard Levitte <levitte@openssl.org>
-.\" Copyright (c) 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: January 5 2025 $
-.Dt RSA_GET0_KEY 3
-.Os
-.Sh NAME
-.Nm RSA_get0_key ,
-.Nm RSA_get0_n ,
-.Nm RSA_get0_e ,
-.Nm RSA_get0_d ,
-.Nm RSA_set0_key ,
-.Nm RSA_get0_factors ,
-.Nm RSA_get0_p ,
-.Nm RSA_get0_q ,
-.Nm RSA_set0_factors ,
-.Nm RSA_get0_crt_params ,
-.Nm RSA_get0_dmp1 ,
-.Nm RSA_get0_dmq1 ,
-.Nm RSA_get0_iqmp ,
-.Nm RSA_set0_crt_params ,
-.Nm RSA_clear_flags ,
-.Nm RSA_test_flags ,
-.Nm RSA_set_flags
-.Nd get and set data in an RSA object
-.Sh SYNOPSIS
-.In openssl/rsa.h
-.Ft void
-.Fo RSA_get0_key
-.Fa "const RSA *r"
-.Fa "const BIGNUM **n"
-.Fa "const BIGNUM **e"
-.Fa "const BIGNUM **d"
-.Fc
-.Ft "const BIGNUM *"
-.Fo RSA_get0_n
-.Fa "const RSA *r"
-.Fc
-.Ft "const BIGNUM *"
-.Fo RSA_get0_e
-.Fa "const RSA *r"
-.Fc
-.Ft "const BIGNUM *"
-.Fo RSA_get0_d
-.Fa "const RSA *r"
-.Fc
-.Ft int
-.Fo RSA_set0_key
-.Fa "RSA *r"
-.Fa "BIGNUM *n"
-.Fa "BIGNUM *e"
-.Fa "BIGNUM *d"
-.Fc
-.Ft void
-.Fo RSA_get0_factors
-.Fa "const RSA *r"
-.Fa "const BIGNUM **p"
-.Fa "const BIGNUM **q"
-.Fc
-.Ft "const BIGNUM *"
-.Fo RSA_get0_p
-.Fa "const RSA *r"
-.Fc
-.Ft "const BIGNUM *"
-.Fo RSA_get0_q
-.Fa "const RSA *r"
-.Fc
-.Ft int
-.Fo RSA_set0_factors
-.Fa "RSA *r"
-.Fa "BIGNUM *p"
-.Fa "BIGNUM *q"
-.Fc
-.Ft void
-.Fo RSA_get0_crt_params
-.Fa "const RSA *r"
-.Fa "const BIGNUM **dmp1"
-.Fa "const BIGNUM **dmq1"
-.Fa "const BIGNUM **iqmp"
-.Fc
-.Ft "const BIGNUM *"
-.Fo RSA_get0_dmp1
-.Fa "const RSA *r"
-.Fc
-.Ft "const BIGNUM *"
-.Fo RSA_get0_dmq1
-.Fa "const RSA *r"
-.Fc
-.Ft "const BIGNUM *"
-.Fo RSA_get0_iqmp
-.Fa "const RSA *r"
-.Fc
-.Ft int
-.Fo RSA_set0_crt_params
-.Fa "RSA *r"
-.Fa "BIGNUM *dmp1"
-.Fa "BIGNUM *dmq1"
-.Fa "BIGNUM *iqmp"
-.Fc
-.Ft void
-.Fo RSA_clear_flags
-.Fa "RSA *r"
-.Fa "int flags"
-.Fc
-.Ft int
-.Fo RSA_test_flags
-.Fa "const RSA *r"
-.Fa "int flags"
-.Fc
-.Ft void
-.Fo RSA_set_flags
-.Fa "RSA *r"
-.Fa "int flags"
-.Fc
-.Sh DESCRIPTION
-An
-.Vt RSA
-object contains the components for the public and private key.
-.Fa n
-is the modulus common to both public and private key,
-.Fa e
-is the public exponent and
-.Fa d
-is the private exponent.
-.Fa p ,
-.Fa q ,
-.Fa dmp1 ,
-.Fa dmq1 ,
-and
-.Fa iqmp
-are the factors for the second representation of a private key
-(see PKCS#1 section 3 Key Types), where
-.Fa p
-and
-.Fa q
-are the first and second factor of
-.Fa n .
-.Fa dmp1 ,
-.Fa dmq1 ,
-and
-.Fa iqmp
-are the exponents and coefficient
-for Chinese Remainder Theorem (CRT) calculations.
-.Pp
-The
-.Fa n ,
-.Fa e ,
-and
-.Fa d
-parameters can be obtained by calling
-.Fn RSA_get0_key .
-If they have not been set yet, then
-.Pf * Fa n ,
-.Pf * Fa e ,
-and
-.Pf * Fa d
-are set to
-.Dv NULL .
-Otherwise, they are set to pointers to the internal representations
-of the values that should not be freed by the caller.
-.Pp
-The
-.Fa n ,
-.Fa e ,
-and
-.Fa d
-parameter values can be set by calling
-.Fn RSA_set0_key .
-The values
-.Fa n
-and
-.Fa e
-must be
-.Pf non- Dv NULL
-the first time this function is called on a given
-.Vt RSA
-object.
-The value
-.Fa d
-may be
-.Dv NULL .
-On subsequent calls, any of these values may be
-.Dv NULL ,
-which means that the corresponding field is left untouched.
-Calling this function transfers the memory management of the values to
-the RSA object.
-Therefore, the values that have been passed in
-should not be freed by the caller.
-.Pp
-In a similar fashion, the
-.Fa p
-and
-.Fa q
-parameters can be obtained and set with
-.Fn RSA_get0_factors
-and
-.Fn RSA_set0_factors ,
-and the
-.Fa dmp1 ,
-.Fa dmq1 ,
-and
-.Fa iqmp
-parameters can be obtained and set with
-.Fn RSA_get0_crt_params
-and
-.Fn RSA_set0_crt_params .
-.Pp
-For
-.Fn RSA_get0_key ,
-.Fn RSA_get0_factors ,
-and
-.Fn RSA_get0_crt_params ,
-.Dv NULL
-value
-.Vt BIGNUM **
-output arguments are permitted.
-The functions
-ignore
-.Dv NULL
-arguments but return values for other,
-.Pf non- Dv NULL ,
-arguments.
-.Pp
-Values retrieved with
-.Fn RSA_get0_key ,
-.Fn RSA_get0_factors ,
-and
-.Fn RSA_get0_crt_params
-are owned by the
-.Vt RSA
-object used in the call and may therefore
-.Em not
-be passed to
-.Fn RSA_set0_key ,
-.Fn RSA_set0_factors ,
-or
-.Fn RSA_set0_crt_params .
-If needed, duplicate the received value using
-.Xr BN_dup 3
-and pass the duplicate.
-.Pp
-Any of the values
-.Fa n ,
-.Fa e ,
-.Fa d ,
-.Fa p ,
-.Fa q ,
-.Fa dmp1 ,
-.Fa dmq1 ,
-and
-.Fa iqmp
-can also be retrieved separately by the corresponding functions
-.Fn RSA_get0_n ,
-.Fn RSA_get0_e ,
-.Fn RSA_get0_d ,
-.Fn RSA_get0_p ,
-.Fn RSA_get0_q ,
-.Fn RSA_get0_dmp1 ,
-.Fn RSA_get0_dmq1 ,
-and
-.Fn RSA_get0_iqmp ,
-respectively.
-The pointers are owned by the
-.Vt RSA
-object.
-.Pp
-.Fn RSA_clear_flags
-clears the specified
-.Fa flags
-in
-.Fa r .
-.Fn RSA_test_flags
-tests the
-.Fa flags
-in
-.Fa r .
-.Fn RSA_set_flags
-sets the
-.Fa flags
-in
-.Fa r ;
-any flags already set remain set.
-For all three functions, multiple flags can be passed in one call,
-OR'ed together bitwise.
-.Pp
-The following flags are supported:
-.Bl -tag -width Ds
-.It Dv RSA_FLAG_CACHE_PRIVATE No and Dv RSA_FLAG_CACHE_PUBLIC
-Precompute information needed for Montgomery multiplication
-from the private and public key, respectively, and cache it in
-.Fa r
-for repeated use.
-These two flags are set by default for the default RSA implementation,
-.Xr RSA_PKCS1_SSLeay 3 .
-.It Dv RSA_FLAG_EXT_PKEY
-The function set with
-.Xr RSA_meth_set_mod_exp 3
-is used for private key operations even if
-.Fa p ,
-.Fa q ,
-.Fa dmp1 ,
-.Fa dmq1 ,
-and
-.Fa iqmp
-are all
-.Dv NULL .
-This flag may be useful with RSA implementations that do not use the
-private key components stored in the standard fields, for example
-because they store the private key in external hardware.
-If this flag is unset, the function set with
-.Xr RSA_meth_set_bn_mod_exp 3
-is used with
-.Fa n
-and
-.Fa d
-instead.
-.It Dv RSA_FLAG_NO_BLINDING
-Turn off blinding during private key encryption and decryption.
-This flag is set by
-.Xr RSA_blinding_off 3 .
-.It Dv RSA_FLAG_SIGN_VER
-This flag has no effect.
-It is provided only for backward compatibility with legacy applications.
-.El
-.Pp
-The flags
-.Dv RSA_FLAG_BLINDING ,
-.Dv RSA_FLAG_CHECKED ,
-.Dv RSA_FLAG_FIPS_METHOD ,
-.Dv RSA_FLAG_NON_FIPS_ALLOW ,
-and
-.Dv RSA_FLAG_THREAD_SAFE
-are defined for compatibility with existing code but have no effect.
-.Sh RETURN VALUES
-.Fn RSA_get0_n ,
-.Fn RSA_get0_e ,
-.Fn RSA_get0_d ,
-.Fn RSA_get0_p ,
-.Fn RSA_get0_q ,
-.Fn RSA_get0_dmp1 ,
-.Fn RSA_get0_dmq1 ,
-and
-.Fn RSA_get0_iqmp
-return a pointer owned by the
-.Vt RSA
-object if the corresponding value has been set,
-otherwise they return
-.Dv NULL .
-.Pp
-.Fn RSA_set0_key ,
-.Fn RSA_set0_factors ,
-and
-.Fn RSA_set0_crt_params
-return 1 on success or 0 on failure.
-.Pp
-.Fn RSA_test_flags
-returns those of the given
-.Fa flags
-currently set in
-.Fa r
-or 0 if none of the given
-.Fa flags
-are set.
-.Sh SEE ALSO
-.Xr RSA_check_key 3 ,
-.Xr RSA_generate_key 3 ,
-.Xr RSA_new 3 ,
-.Xr RSA_print 3 ,
-.Xr RSA_size 3
-.Sh HISTORY
-.Fn RSA_get0_key ,
-.Fn RSA_set0_key ,
-.Fn RSA_get0_factors ,
-.Fn RSA_set0_factors ,
-.Fn RSA_get0_crt_params ,
-.Fn RSA_set0_crt_params ,
-.Fn RSA_clear_flags ,
-.Fn RSA_test_flags ,
-and
-.Fn RSA_set_flags
-first appeared in OpenSSL 1.1.0
-and have been available since
-.Ox 6.3 .
-.Pp
-.Fn RSA_get0_n ,
-.Fn RSA_get0_e ,
-.Fn RSA_get0_d ,
-.Fn RSA_get0_p ,
-.Fn RSA_get0_q ,
-.Fn RSA_get0_dmp1 ,
-.Fn RSA_get0_dmq1 ,
-and
-.Fn RSA_get0_iqmp
-first appeared in OpenSSL 1.1.1
-and have been available since
-.Ox 7.1 .