1BN_SECURITY_BITS(3ossl)             OpenSSL            BN_SECURITY_BITS(3ossl)
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NAME

6       BN_security_bits - returns bits of security based on given numbers
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SYNOPSIS

9        #include <openssl/bn.h>
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11        int BN_security_bits(int L, int N);
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DESCRIPTION

14       BN_security_bits() returns the number of bits of security provided by a
15       specific algorithm and a particular key size. The bits of security is
16       defined in NIST SP800-57. Currently, BN_security_bits() support two
17       types of asymmetric algorithms: the FFC (Finite Field Cryptography) and
18       IFC (Integer Factorization Cryptography). For FFC, e.g., DSA and DH,
19       both parameters L and N are used to decide the bits of security, where
20       L is the size of the public key and N is the size of the private key.
21       For IFC, e.g., RSA, only L is used and it's commonly considered to be
22       the key size (modulus).
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RETURN VALUES

25       Number of security bits.
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NOTES

28       ECC (Elliptic Curve Cryptography) is not covered by the
29       BN_security_bits() function. The symmetric algorithms are not covered
30       neither.
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SEE ALSO

33       DH_security_bits(3), DSA_security_bits(3), RSA_security_bits(3)
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HISTORY

36       The BN_security_bits() function was added in OpenSSL 1.1.0.
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39       Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved.
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41       Licensed under the Apache License 2.0 (the "License").  You may not use
42       this file except in compliance with the License.  You can obtain a copy
43       in the file LICENSE in the source distribution or at
44       <https://www.openssl.org/source/license.html>.
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483.1.1                             2023-08-31           BN_SECURITY_BITS(3ossl)
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