This wraps the `fdesetup validaterecovery -inputplist` for easy remote execution. Edit the fvKey variable in the script with your key or run it with the key as an argument.

Validate Recovery Key.sh

#!/bin/bash


fvKey="CN72-EJBE-8LTH-EL99-RDN5-OMXB"

if [[ $1 != '' ]]; then
    fvKey="$1"; fi

sudo fdesetup validaterecovery -inputplist <<EOF
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>Password</key>
<string>$fvKey</string>
</dict>
</plist>
EOF

So... just, y'know, be careful where your keys are plaintext and stuff. #security #myrealkeyisatesla.