From 74463cb377622a35f991bd10c0b73889664494b7 Mon Sep 17 00:00:00 2001
From: Max Goedjen <max.goedjen@gmail.com>
Date: Sun, 17 Jan 2021 14:14:42 -0800
Subject: [PATCH] Fix padding

---
 SecretKit/Common/OpenSSH/OpenSSHKeyWriter.swift | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/SecretKit/Common/OpenSSH/OpenSSHKeyWriter.swift b/SecretKit/Common/OpenSSH/OpenSSHKeyWriter.swift
index 45c8ca0..a577476 100644
--- a/SecretKit/Common/OpenSSH/OpenSSHKeyWriter.swift
+++ b/SecretKit/Common/OpenSSH/OpenSSHKeyWriter.swift
@@ -20,7 +20,11 @@ public struct OpenSSHKeyWriter {
     }
 
     public func openSSHSHA256Fingerprint<SecretType: Secret>(secret: SecretType) -> String {
-        "SHA256:\(Data(SHA256.hash(data: data(secret: secret))).base64EncodedString())"
+        // OpenSSL format seems to strip the padding at the end.
+        let base64 = Data(SHA256.hash(data: data(secret: secret))).base64EncodedString()
+        let paddingRange = base64.index(base64.endIndex, offsetBy: -2)..<base64.endIndex
+        let cleaned = base64.replacingOccurrences(of: "=", with: "", range: paddingRange)
+        return "SHA256:\(cleaned)"
     }
 
     public func openSSHMD5Fingerprint<SecretType: Secret>(secret: SecretType) -> String {