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//opt/alt/openssl11/share/man/man3/BN_security_bits.3ssl
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Always turn off hyphenation; it makes .\" way too many mistakes in technical documents. .if n .ad l .nh .SH "NAME" BN_security_bits \- returns bits of security based on given numbers .SH "SYNOPSIS" .IX Header "SYNOPSIS" .Vb 1 \& #include <openssl/bn.h> \& \& int BN_security_bits(int L, int N); .Ve .SH "DESCRIPTION" .IX Header "DESCRIPTION" \&\fIBN_security_bits()\fR returns the number of bits of security provided by a specific algorithm and a particular key size. The bits of security is defined in \s-1NIST SP800\-57.\s0 Currently, \fIBN_security_bits()\fR support two types of asymmetric algorithms: the \s-1FFC \s0(Finite Field Cryptography) and \s-1IFC \&\s0(Integer Factorization Cryptography). For \s-1FFC,\s0 e.g., \s-1DSA\s0 and \s-1DH,\s0 both parameters \fBL\fR and \fBN\fR are used to decide the bits of security, where \&\fBL\fR is the size of the public key and \fBN\fR is the size of the private key. For \s-1IFC,\s0 e.g., \s-1RSA,\s0 only \fBL\fR is used and it's commonly considered to be the key size (modulus). .SH "RETURN VALUES" .IX Header "RETURN VALUES" Number of security bits. .SH "NOTES" .IX Header "NOTES" \&\s-1ECC \s0(Elliptic Curve Cryptography) is not covered by the \fIBN_security_bits()\fR function. The symmetric algorithms are not covered neither. .SH "SEE ALSO" .IX Header "SEE ALSO" \&\fIDH_security_bits\fR\|(3), \fIDSA_security_bits\fR\|(3), \fIRSA_security_bits\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" The \fIBN_security_bits()\fR function was added in OpenSSL 1.1.0. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2017\-2019 The OpenSSL Project Authors. All Rights Reserved. .PP Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use this file except in compliance with the License. You can obtain a copy in the file \s-1LICENSE\s0 in the source distribution or at <https://www.openssl.org/source/license.html>.
