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.\" $OpenBSD: RSA_size.3,v 1.8 2018/03/23 23:18:17 schwarze Exp $
.\" full merge up to: OpenSSL 99d63d46 Oct 26 13:56:48 2016 -0400
.\"
.\" This file was written by Ulf Moeller <ulf@openssl.org> and
.\" Kurt Roeckx <kurt@roeckx.be>.
.\" Copyright (c) 2000, 2002, 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
.\" 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;
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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.\"
.Dd $Mdocdate: March 23 2018 $
.Dt RSA_SIZE 3
.Os
.Sh NAME
.Nm RSA_size ,
.Nm RSA_bits
.Nd get the RSA modulus size
.Sh SYNOPSIS
.In openssl/rsa.h
.Ft int
.Fo RSA_size
.Fa "const RSA *rsa"
.Fc
.Ft int
.Fo RSA_bits
.Fa "const RSA *rsa"
.Fc
.Sh DESCRIPTION
.Fn RSA_size
returns the RSA modulus size in bytes.
It can be used to determine how much memory must be allocated for
an RSA encrypted value.
.Pp
.Fn RSA_bits
returns the number of significant bits.
.Pp
.Fa rsa
and
.Fa rsa->n
must not be
.Dv NULL .
.Sh RETURN VALUES
The size.
.Sh SEE ALSO
.Xr BN_num_bits 3 ,
.Xr RSA_get0_key 3 ,
.Xr RSA_new 3
.Sh HISTORY
.Fn RSA_size
appeared before SSLeay 0.8 and has been available since
.Ox 2.4 .
.Pp
.Fn RSA_bits
first appeared in OpenSSL 1.1.0 and has been available since
.Ox 6.3 .
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