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# Introduced in version 2.5.0
## Major code re-factoring
* Reception of an `SSH_MSG_UNIMPLEMENTED` response to a `SSH_MSG_GLOBAL_REQUEST` is
translated internally into same code flow as if an `SSH_MSH_REQUEST_FAILURE` has
been received - see [SSHD-968](https://issues.apache.org/jira/browse/SSHD-968).
* Server SFTP subsystem internal code dealing with the local files has been delegated to
the `SftpFileSystemAccessor` in order to allow easier hooking into the SFTP subsystem.
* Resolving a local file path for an SFTP remote one
* Reading/Writing a file's attribute(s)
* Creating files links
* Copying / Renaming / Deleting files
* `SftpVersionSelector` is now consulted when client sends initial command (as well
as when session is re-negotiated)
* `ScpCommandFactory` is also a `ShellFactory` that can be used to provide a minimalistic
shell that is good enough for *WinSCP*.
* Rework SFTP streams so that the client asks and receives as much data as possible - see
[SSHD-979](https://issues.apache.org/jira/browse/SSHD-979).
## Minor code helpers
* Handling of debug/ignore/unimplemented messages has been split into `handleXXX` and `doInvokeXXXMsgHandler` methods
where the former validate the messages and deal with the idle timeout, and the latter execute the actual invcation.
* Added overloaded methods that accept a `java.time.Duration` specifier for timeout value.
* The argument representing the SFTP subsystem in invocations to `SftpFileSystemAccessor` has been enhanced to expose
as much of the available functionality as possible.
## Behavioral changes and enhancements
* [SSHD-964](https://issues.apache.org/jira/browse/SSHD-964) - Send SSH_MSG_CHANNEL_EOF when tunnel channel being closed.
* [SSHD-967](https://issues.apache.org/jira/browse/SSHD-967) - Extra bytes written when `SftpRemotePathChannel#transferTo` is used.
* [SSHD-968](https://issues.apache.org/jira/browse/SSHD-968) - Interpret SSH_MSG_UNIMPLEMENTED response to a heartbeat request as a liveness indicator
* [SSHD-970](https://issues.apache.org/jira/browse/SSHD-970) - `transferTo` function of `SftpRemotePathChannel` will loop if count parameter is greater than file size
* [SSHD-972](https://issues.apache.org/jira/browse/SSHD-972) - Add support for peers using OpenSSH "security key" key types
* [SSHD-977](https://issues.apache.org/jira/browse/SSHD-977) - Apply consistent logging policy to caught exceptions
* [SSHD-660](https://issues.apache.org/jira/browse/SSHD-660) - Added support for server-side signed certificate keys
* [SSHD-984](https://issues.apache.org/jira/browse/SSHD-984) - Utility method to export KeyPair in OpenSSH format
* [SSHD-992](https://issues.apache.org/jira/browse/SSHD-984) - Provide more hooks into the SFTP server subsystem via SftpFileSystemAccessor
* [SSHD-997](https://issues.apache.org/jira/browse/SSHD-997) - Fixed OpenSSH private key decoders for RSA and Ed25519
* [SSHD-998](https://issues.apache.org/jira/browse/SSHD-998) - Take into account SFTP version preference when establishing initial channel
* [SSHD-989](https://issues.apache.org/jira/browse/SSHD-989) - Read correctly ECDSA key pair from PKCS8 encoded data
* [SSHD-1009](https://issues.apache.org/jira/browse/SSHD-1009) - Provide a minimalistic shell for supporting *WinSCP* SCP mode.
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