=pod
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=head1 NAME
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BN_security_bits - returns bits of security based on given numbers
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=head1 SYNOPSIS
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#include <openssl/bn.h>
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int BN_security_bits(int L, int N);
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=head1 DESCRIPTION
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BN_security_bits() returns the number of bits of security provided by a
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specific algorithm and a particular key size. The bits of security is
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defined in NIST SP800-57. Currently, BN_security_bits() support two types
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of asymmetric algorithms: the FFC (Finite Field Cryptography) and IFC
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(Integer Factorization Cryptography). For FFC, e.g., DSA and DH, both
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parameters B<L> and B<N> are used to decide the bits of security, where
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B<L> is the size of the public key and B<N> is the size of the private
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key. For IFC, e.g., RSA, only B<L> is used and it's commonly considered
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to be the key size (modulus).
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=head1 RETURN VALUES
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Number of security bits.
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=head1 NOTES
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ECC (Elliptic Curve Cryptography) is not covered by the BN_security_bits()
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function. The symmetric algorithms are not covered neither.
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=head1 SEE ALSO
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L<DH_security_bits(3)>, L<DSA_security_bits(3)>, L<RSA_security_bits(3)>
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=head1 HISTORY
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The BN_security_bits() function was added in OpenSSL 1.1.0.
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=head1 COPYRIGHT
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Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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