BN_SECURITY_BITS
Section: OpenSSL (3SSL)
Updated: 2024-03-03
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NAME
BN_security_bits - returns bits of security based on given numbers
SYNOPSIS
#include <openssl/bn.h>
int BN_security_bits(int L, int N);
DESCRIPTION
BN_security_bits() returns the number of bits of security provided by a
specific algorithm and a particular key size. The bits of security is
defined in NIST SP800-57. Currently, BN_security_bits() support two types
of asymmetric algorithms: the FFC (Finite Field Cryptography) and IFC
(Integer Factorization Cryptography). For FFC, e.g., DSA and DH, both
parameters L and N are used to decide the bits of security, where
L is the size of the public key and N is the size of the private
key. For IFC, e.g., RSA, only L is used and it's commonly considered
to be the key size (modulus).
RETURN VALUES
Number of security bits.
NOTES
ECC (Elliptic Curve Cryptography) is not covered by the BN_security_bits()
function. The symmetric algorithms are not covered neither.
SEE ALSO
DH_security_bits(3), DSA_security_bits(3), RSA_security_bits(3)
HISTORY
The BN_security_bits() function was added in OpenSSL 1.1.0.
COPYRIGHT
Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (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
<https://www.openssl.org/source/license.html>.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUES
-
- NOTES
-
- SEE ALSO
-
- HISTORY
-
- COPYRIGHT
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