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=pod
=head1 NAME
RSA_size, RSA_bits, RSA_security_bits - get RSA modulus size or security bits
=head1 SYNOPSIS
#include <openssl/rsa.h>
int RSA_size(const RSA *rsa);
int RSA_bits(const RSA *rsa);
int RSA_security_bits(const RSA *rsa)
=head1 DESCRIPTION
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.
RSA_bits() returns the number of significant bits.
B<rsa> and B<rsa-E<gt>n> must not be B<NULL>.
RSA_security_bits() returns the number of security bits of the given B<rsa>
key. See L<BN_security_bits(3)>.
=head1 RETURN VALUES
RSA_size() returns the size of modulus in bytes.
DSA_bits() returns the number of bits in the key.
RSA_security_bits() returns the number of security bits.
=head1 SEE ALSO
L<BN_num_bits(3)>
=head1 HISTORY
RSA_bits() was added in OpenSSL 1.1.0.
=head1 COPYRIGHT
Copyright 2000-2018 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the OpenSSL license (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file LICENSE in the source distribution or at
L<https://www.openssl.org/source/license.html>.
=cut
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