flutter / third_party / openssl / 4b1b629725970384d6cf4dafe9e83e54859574cd / . / doc / man3 / BN_security_bits.pod

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=head1 NAME | |

BN_security_bits - returns bits of security based on given numbers | |

=head1 SYNOPSIS | |

#include <openssl/bn.h> | |

int BN_security_bits(int L, int N); | |

=head1 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 B<L> and B<N> are used to decide the bits of security, where | |

B<L> is the size of the public key and B<N> is the size of the private | |

key. For IFC, e.g., RSA, only B<L> is used and it's commonly considered | |

to be the key size (modulus). | |

=head1 RETURN VALUES | |

Number of security bits. | |

=head1 NOTES | |

ECC (Elliptic Curve Cryptography) is not covered by the BN_security_bits() | |

function. The symmetric algorithms are not covered neither. | |

=head1 SEE ALSO | |

L<DH_security_bits(3)>, L<DSA_security_bits(3)>, L<RSA_security_bits(3)> | |

=head1 HISTORY | |

The BN_security_bits() function was added in OpenSSL 1.1.0. | |

=head1 COPYRIGHT | |

Copyright 2017-2019 The OpenSSL Project Authors. All Rights Reserved. | |

Licensed under the Apache License 2.0 (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 | |

L<https://www.openssl.org/source/license.html>. | |

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