Generate primes for use with SSH

generate-moduli.sh

#!/bin/bash
#
# Create primes for use with ssh.
#
if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

for bitlen in 2048 3072 4096 6144 8192 ;
do
    echo Looking for candidates: $bitlen bits. ;
    ssh-keygen -G moduli-${bitlen}.candidates -b $bitlen ;
    cat moduli-${bitlen}.candidates >> moduli.candidates
    rm moduli-${bitlen}.candidates 
done ;

echo Testing all candidates... ;
ssh-keygen -T moduli.strong -f moduli.candidates ;
rm moduli.candidates
echo Done. Result in moduli.strong ;