BN_security_bits(3) OpenSSL BN_security_bits(3)
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 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
<https://www.openssl.org/source/license.html>.
1.1.1c 2019-05-28 BN_security_bits(3)
openssl 1.1.1c - Generated Tue Jun 11 12:27:18 CDT 2019