39 lines
1.6 KiB
Go
39 lines
1.6 KiB
Go
/*
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SSHSecure - a program to harden OpenSSH from defaults
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Copyright (C) 2020 Brent Saner
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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package dh
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/*
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OpenSSH does prime generation and primality checking a *little* weird.
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The seemingly go-to package for DH parameter generation in Golang, github.com/Luzifer/go-dhparam,
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does implement safety checking in a way I believe to be safe (with the huge caveat that I am nowhere
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near a professional, expert, guru, etc. in mathematics, cryptography, or the like).
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However, it is incompatible with OpenSSH's methodology for DH parameter generation.
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1.) First, primes are generated via the Sieve of Eratosthenes.
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a.) They must also be Sophie Germain primes (where p is selected prime, 2p+1 is also prime).
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2.) Then they are filtered via Probabilistic Miller-Rabin primality tests (on both q and p, where q is (p-1)/2).
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3.) OpenSSH fully supports generators of 2, 3, and 5 whereas go-dhparam only fully supports 2 and 5.
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And that's why I'm a sad panda and porting moduli.c to native Golang.
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*/
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func SieveLarge()
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