BN_security_bits - returns bits of security based on given numbers
int BN_security_bits(int L, int N);
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).
Number of security bits.
ECC (Elliptic Curve Cryptography) is not covered by the
BN_security_bits() function. The symmetric algorithms are not covered
The BN_security_bits() function was added in OpenSSL 1.1.0.
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