From 739e6ece46dadd3ea63d8ba647385a5743112abe Mon Sep 17 00:00:00 2001
From: Amir <amir.khodak@gmail.com>
Date: Sun, 24 May 2026 19:11:30 +0000
Subject: [PATCH] fix: implement findExistingAlgorithms in TofuHostKeyVerifier
 (sshj 0.38 API)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
---
 .../com/syncflow/data/providers/sftp/TofuHostKeyVerifier.kt   | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/app/src/main/kotlin/com/syncflow/data/providers/sftp/TofuHostKeyVerifier.kt b/app/src/main/kotlin/com/syncflow/data/providers/sftp/TofuHostKeyVerifier.kt
index 8a38f3f..465a904 100644
--- a/app/src/main/kotlin/com/syncflow/data/providers/sftp/TofuHostKeyVerifier.kt
+++ b/app/src/main/kotlin/com/syncflow/data/providers/sftp/TofuHostKeyVerifier.kt
@@ -24,6 +24,10 @@ class TofuHostKeyVerifier(private val credentialStore: CredentialStore) : HostKe
         }
     }
 
+    // Return empty list so sshj uses server preference order for key exchange.
+    // Our verify() will accept or reject whatever algorithm is negotiated.
+    override fun findExistingAlgorithms(hostname: String, port: Int): List<String> = emptyList()
+
     private fun sha256Fingerprint(key: PublicKey): String {
         val digest = MessageDigest.getInstance("SHA-256").digest(key.encoded)
         return digest.joinToString(":") { "%02x".format(it) }