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alecdwm/get-sha256-fingerprint.sh

Created March 12, 2018 03:12
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Fetch the sha256 fingerprint of a TCP server's TLS cert
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get-sha256-fingerprint.sh
#!/bin/bash
# Works for any TLS-enabled TCP server, but originally intended for
# fetching the sha256 fingerprint of an irc server's TLS cert
# when the server refuses to use certificates from a trusted CA.
#
# Example:
# $ get-sha256-fingerprint.sh irc.owls.io:6697
openssl s_client -connect "$1" < /dev/null 2>/dev/null | openssl x509 -fingerprint -sha256 -noout -in /dev/stdin | sed -e "s/://g"
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