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-.\" $OpenBSD: EVP_PKEY_size.3,v 1.4 2024/12/06 12:51:13 schwarze Exp $
-.\" full merge up to: OpenSSL eed9d03b Jan 8 11:04:15 2020 +0100
-.\"
-.\" This file is a derived work.
-.\" The changes are covered by the following Copyright and license:
-.\"
-.\" Copyright (c) 2022, 2023 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) 2020 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 6 2024 $
-.Dt EVP_PKEY_SIZE 3
-.Os
-.Sh NAME
-.Nm EVP_PKEY_size ,
-.Nm EVP_PKEY_bits ,
-.Nm EVP_PKEY_security_bits
-.Nd EVP_PKEY information functions
-.Sh SYNOPSIS
-.In openssl/evp.h
-.Ft int
-.Fo EVP_PKEY_size
-.Fa "const EVP_PKEY *pkey"
-.Fc
-.Ft int
-.Fo EVP_PKEY_bits
-.Fa "const EVP_PKEY *pkey"
-.Fc
-.Ft int
-.Fo EVP_PKEY_security_bits
-.Fa "const EVP_PKEY *pkey"
-.Fc
-.Sh DESCRIPTION
-.Fn EVP_PKEY_size
-returns the maximum size in bytes needed for the output buffer
-for almost any operation that can be done with
-.Fa pkey .
-The primary use is with
-.Xr EVP_SignFinal 3
-and
-.Xr EVP_SealInit 3 .
-The returned size is also large enough for the output buffer of
-.Xr EVP_PKEY_sign 3 ,
-.Xr EVP_PKEY_encrypt 3 ,
-.Xr EVP_PKEY_decrypt 3 ,
-and
-.Xr EVP_PKEY_derive 3 .
-.Pp
-Unless the documentation for the operation says otherwise,
-the size returned by
-.Fn EVP_PKEY_size
-is only an upper limit and the final content of the target
-buffer may be smaller.
-It is therefore crucial to take note of the size given back by the
-function that performs the operation.
-For example,
-.Xr EVP_PKEY_sign 3
-returns that length in the
-.Pf * Fa siglen
-argument.
-.Pp
-Using
-.Fn EVP_PKEY_size
-is discouraged with
-.Xr EVP_DigestSignFinal 3 .
-.Pp
-Most functions using an output buffer support passing
-.Dv NULL
-for the buffer and a pointer to an integer
-to get the exact size that this function call delivers
-in the context that it is called in.
-This allows those functions to be called twice, once to find out the
-exact buffer size, then allocate the buffer in between, and call that
-function again to actually output the data.
-For those functions, it isn't strictly necessary to call
-.Fn EVP_PKEY_size
-to find out the buffer size, but it may still be useful in cases
-where it's desirable to know the upper limit in advance.
-.Pp
-.Fn EVP_PKEY_size
-is supported for the following algorithms:
-.Bl -column ED25519 "EVP_MAX_BLOCK_LENGTH = 32"
-.It        Ta same result as from:
-.It CMAC   Ta Dv EVP_MAX_BLOCK_LENGTH No = 32
-.It DH     Ta Xr DH_size 3
-.It DSA    Ta Xr DSA_size 3
-.It EC     Ta Xr ECDSA_size 3
-.It ED25519 Ta 64, but see below
-.It HMAC   Ta Dv EVP_MAX_MD_SIZE No = 64
-.It RSA    Ta Xr RSA_size 3
-.It X25519 Ta Dv X25519_KEYLEN No = 32
-.El
-.Pp
-For
-.Dv EVP_PKEY_ED25519 ,
-the situation is special: while the key size is
-.Dv ED25519_KEYLEN No = 32 bytes ,
-.Fn EVP_PKEY_size
-returns 64 because the signature is longer than the keys.
-.Pp
-.Fn EVP_PKEY_bits
-returns the cryptographic length of the cryptosystem to which the key in
-.Fa pkey
-belongs, in bits.
-The definition of cryptographic length is specific to the key cryptosystem.
-The following algorithms are supported:
-.Bl -column ED25519 "the public domain parameter p" DSA_bits(3)
-.It        Ta cryptographic length = Ta same result as from:
-.It        Ta significant bits in ... Ta
-.It DH     Ta the public domain parameter Fa p Ta Xr DH_bits 3
-.It DSA    Ta the public domain parameter Fa p Ta Xr DSA_bits 3
-.It EC     Ta the order of the group Ta Xr EC_GROUP_order_bits 3
-.It ED25519 Ta 253 Ta \(em
-.It RSA    Ta the public modulus Ta Xr RSA_bits 3
-.It X25519 Ta 253 Ta \(em
-.El
-.Pp
-.Fn EVP_PKEY_security_bits
-returns the security strength measured in bits of the given
-.Fa pkey
-as defined in NIST SP800-57.
-The following algorithms are supported:
-.Bl -column ED25519 DSA_security_bits(3)
-.It        Ta same result as from:
-.It DH     Ta Xr DH_security_bits 3
-.It DSA    Ta Xr DSA_security_bits 3
-.It EC     Ta Xr EC_GROUP_order_bits 3 divided by 2
-.It ED25519 Ta 128
-.It RSA    Ta Xr RSA_security_bits 3
-.It X25519 Ta 128
-.El
-.Pp
-For EC keys, if the result is greater than 80, it is rounded down
-to 256, 192, 128, 112, or 80.
-.Sh RETURN VALUES
-.Fn EVP_PKEY_size
-and
-.Fn EVP_PKEY_bits
-return a positive number or 0 if this size isn't available.
-.Pp
-.Fn EVP_PKEY_security_bits
-returns a number in the range from 0 to 256 inclusive
-or \-2 if this function is unsupported for the algorithm used by
-.Fa pkey .
-It returns 0 if
-.Fa pkey
-is
-.Dv NULL .
-.Sh SEE ALSO
-.Xr EVP_PKEY_decrypt 3 ,
-.Xr EVP_PKEY_derive 3 ,
-.Xr EVP_PKEY_encrypt 3 ,
-.Xr EVP_PKEY_new 3 ,
-.Xr EVP_PKEY_sign 3 ,
-.Xr EVP_SealInit 3 ,
-.Xr EVP_SignFinal 3
-.Sh HISTORY
-.Fn EVP_PKEY_size
-first appeared in SSLeay 0.6.0 and
-.Fn EVP_PKEY_bits
-in SSLeay 0.9.0.
-Both functions have been available since
-.Ox 2.4 .
-.Pp
-.Fn EVP_PKEY_security_bits
-first appeared in OpenSSL 1.1.0 and has been available since
-.Ox 7.2 .