Enji Cooper
5254e16213
A new manpage and any associated links will be added in the next commit.
MFC after: 1 day (the security issues warrant a quick backport).
MFC with: 10a428653e
107 lines
3.2 KiB
Plaintext
107 lines
3.2 KiB
Plaintext
.\" -*- mode: troff; coding: utf-8 -*-
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.\" Automatically generated by Pod::Man v6.0.2 (Pod::Simple 3.45)
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.\" ========================================================================
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.\"
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.IX Title "BN_SECURITY_BITS 3ossl"
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.TH BN_SECURITY_BITS 3ossl 2026-04-07 3.5.6 OpenSSL
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.nh
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.SH NAME
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BN_security_bits \- returns bits of security based on given numbers
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.SH SYNOPSIS
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/bn.h>
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\&
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\& int BN_security_bits(int L, int N);
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.Ve
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.SH DESCRIPTION
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.IX Header "DESCRIPTION"
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\&\fBBN_security_bits()\fR returns the number of bits of security provided by a
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specific algorithm and a particular key size. The bits of security is
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defined in NIST SP800\-57. Currently, \fBBN_security_bits()\fR support two types
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of asymmetric algorithms: the FFC (Finite Field Cryptography) and IFC
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(Integer Factorization Cryptography). For FFC, e.g., DSA and DH, both
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parameters \fBL\fR and \fBN\fR are used to decide the bits of security, where
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\&\fBL\fR is the size of the public key and \fBN\fR is the size of the private
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key. For IFC, e.g., RSA, only \fBL\fR is used and it\*(Aqs commonly considered
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to be the key size (modulus).
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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Number of security bits.
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.SH NOTES
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.IX Header "NOTES"
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ECC (Elliptic Curve Cryptography) is not covered by the \fBBN_security_bits()\fR
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function. The symmetric algorithms are not covered neither.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fBDH_security_bits\fR\|(3), \fBDSA_security_bits\fR\|(3), \fBRSA_security_bits\fR\|(3)
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.SH HISTORY
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.IX Header "HISTORY"
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The \fBBN_security_bits()\fR function was added in OpenSSL 1.1.0.
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.SH COPYRIGHT
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.IX Header "COPYRIGHT"
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Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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