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January 17, 2020 06:29
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An awk script that provides the same functionality as ssh-keygen -F <host>
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| #!/usr/bin/env bash | |
| host=$1 | |
| awk -v host=$host ' | |
| /^|1/ { | |
| split($1, a, /\|/) | |
| key=a[3] | |
| hmac=a[4] | |
| "echo -n " host " | openssl sha1 -mac HMAC -macopt hexkey:$(echo " key " | base64 -d | xxd -p) -binary | base64" | getline myhmac | |
| if (hmac == myhmac) { | |
| print "# Host " host " found: line " NR | |
| } | |
| }' ~/.ssh/known_hosts |
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