| 1 | =pod
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| 2 |
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| 3 | =head1 NAME
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| 4 |
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| 5 | BN_security_bits - returns bits of security based on given numbers
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| 6 |
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| 7 | =head1 SYNOPSIS
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| 8 |
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| 9 | #include <openssl/bn.h>
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| 10 |
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| 11 | int BN_security_bits(int L, int N);
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| 12 |
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| 13 | =head1 DESCRIPTION
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| 14 |
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| 15 | BN_security_bits() returns the number of bits of security provided by a
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| 16 | specific algorithm and a particular key size. The bits of security is
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| 17 | defined in NIST SP800-57. Currently, BN_security_bits() support two types
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| 18 | of asymmetric algorithms: the FFC (Finite Field Cryptography) and IFC
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| 19 | (Integer Factorization Cryptography). For FFC, e.g., DSA and DH, both
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| 20 | parameters B<L> and B<N> are used to decide the bits of security, where
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| 21 | B<L> is the size of the public key and B<N> is the size of the private
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| 22 | key. For IFC, e.g., RSA, only B<L> is used and it's commonly considered
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| 23 | to be the key size (modulus).
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| 24 |
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| 25 | =head1 RETURN VALUES
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| 26 |
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| 27 | Number of security bits.
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| 28 |
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| 29 | =head1 NOTES
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| 30 |
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| 31 | ECC (Elliptic Curve Cryptography) is not covered by the BN_security_bits()
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| 32 | function. The symmetric algorithms are not covered neither.
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| 33 |
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| 34 | =head1 SEE ALSO
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| 35 |
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| 36 | L<DH_security_bits(3)>, L<DSA_security_bits(3)>, L<RSA_security_bits(3)>
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| 37 |
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| 38 | =head1 HISTORY
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| 39 |
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| 40 | The BN_security_bits() function was added in OpenSSL 1.1.0.
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| 41 |
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| 42 | =head1 COPYRIGHT
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| 43 |
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| 44 | Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
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| 45 |
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| 46 | Licensed under the OpenSSL license (the "License"). You may not use
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| 47 | this file except in compliance with the License. You can obtain a copy
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| 48 | in the file LICENSE in the source distribution or at
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| 49 | L<https://www.openssl.org/source/license.html>.
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| 50 |
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| 51 | =cut
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