From 8b3f56a419eb6f3d8c0d711e5f35bae5fcfc534e Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Fri, 11 Apr 2025 15:02:18 -0400
Subject: fingerprint

---
 fingerprint.go | 7 +++++++
 handshake.go   | 2 +-
 2 files changed, 8 insertions(+), 1 deletion(-)
 create mode 100644 fingerprint.go

diff --git a/fingerprint.go b/fingerprint.go
new file mode 100644
index 0000000..9812114
--- /dev/null
+++ b/fingerprint.go
@@ -0,0 +1,7 @@
+package main
+
+import "crypto/sha256"
+
+func fingerprint(key []byte) []byte {
+	return sha256.New().Sum(key)
+}
diff --git a/handshake.go b/handshake.go
index cfe7085..2cedaad 100644
--- a/handshake.go
+++ b/handshake.go
@@ -96,7 +96,7 @@ func verifyPublicKey(addr net.Addr, pubkey [32]byte) (bool, error) {
 
 	// Ask host to verify fingerprint.
 	logf("Fingerprint of host %q: %s\nIs this the correct fingerprint (yes/[no])?",
-		hostname, fingerprint(pubkey))
+		hostname, fingerprint(pubkey[:]))
 	var response string
 	n, err := fmt.Scanln(&response)
 	if err != nil {
-- 
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