Secure .NET SFTP Library for C# and VB.NET

Optimized for Transfer Speed and Memory Usage

To ensure it performs well, we:

• Optimize its code following best coding practices for performance
• Use as few resources as possible to minimize memory usage
• Optimize default component and socket settings for maximum transfer speed

As a result, data is transferred at the maximum transfer speed possible. Should you want to limit the transfer speed, take advantage of bandwidth throttling by setting the MaxDownloadSpeed and MaxUploadSpeed properties of the Sftp class.

Intuitive and Fully Documented API

Connect, authenticate the user to the server, and transfer files with a few lines of code using the intuitive API of ComponentPro's C# SFTP client API. By using 100% managed code written in C#, this component takes advantage of the numerous built-in features of the .NET Framework to enhance performance. Moreover, the library is CLS compliant, and it does not use any unsafe blocks for minimal permission requirements.

Our classes are fully documented with detailed example code which helps shorten your learning curve. If your development environment is Visual Studio, enjoy the full integration of the online documentation. Just mark or select a keyword and press F1 in your Visual Studio IDE, and the online documentation is represented instantly.

Unified File System across SFTP, FTP and ZIP libraries

To reduce the effort required to rewrite a number of classes for different systems such as FTP, SFTP, ZIP, Local Disk, and Memory, we introduce the Unified File System. This makes the file and directory management on these systems seamless. The Unified File System allows you to use the same code to transfer items directly between two different systems. As a benefit, you may need to write only one class that works with all systems. The complicated work is done by the File System library, eliminating the requirement to learn more about other File Transfer Protocols. For more information, please visit this topic.

• Upload files and directories
• Upload/download a file

Support SCP

The library also includes SCP classes that let you perform SCP file copying easily.

• Upload remote items using SCP
• Transfer a file

Advanced File Management

Provides synchronous or asynchronous data transfer operations as well as the ability to deep search, delete, move, set properties, check existence, synchronize, and compare files and directories to your applications, offering an easy way to manage remote items.

The FileSystem library included in the package allows you to define search criteria so you can send, receive, move, search, delete, and mirror only files and folders that fit the specified criteria.

Some examples:

• Upload local files and directories
• Control file upload process
• Extract items within a ZIP archive to SFTP server on-the-fly

Manipulate File List On-the-fly

Not only does Ultimate SFTP support standard and advanced SFTP operations above, it also supports monitoring and manipulating processing file list while executing muti-file operations like deleting, moving, uploading, and downloading items. That feature makes it possible to add more files to transfer while the operation is still in process. It also provides real-time statistics and status of the items in progress. To add or remove a file or directory from the list of processing items, all you need to do is to call the Add or Remove method of the ProgressFileList class.

Support Multi-threading

In addition to supporting basic and advanced tasks, Ultimate SFTP also supports multi-thread download and upload, as well as data compression on-the-fly with built-in Zlib classes to speed up the transfer.

Some examples:

• Download multiple items
• Upload multiple local items

You can even split a large remote SFTP file into smaller chunks and download them simultaneously with the MultiPartDownload method. Check out this topic for more details: Chunk file download

Support for Many Authentication Methods

In addition to basic username/password authentication method, the SFTP library also supports public key, keyboard-interactive, and GSSAPI, NTLM or Kerberos (with single sign-on as well) authentication methods.

Some examples:

• Authenticate to an SFTP server
• Public key authentication

SSH Features Included

Beside having the comprehensive SFTP interface, it also supports other SSH operations such as executing a command on an SSH server, tunneling through it, starting a new SSH terminal session, reusing an SSH connection for another task, generating key pairs for SSH authentication, etc.

PowerShell and SQL-SSIS

UltimateSftp can be easily integrated with Powershell with some simple steps. You can also use it for the SQL-SSIS package. Please see this topic for more details.

Security

The library enables you to build applications with many security features including enabling only the Federal Information Processing Standards (FIPS) approved encryptions, verifying server key, and generating private/public key pairs. Easy-to-use API for validating server identity and cutomizing/fine-tuning SSH parameters. It supports PKCS8, PuTTY and OpenSSH key formats as well as keys stored on smart cards. It supports the following security algorithms:

• Encryption Algorithm: AES, RC4, Triple DES, Blowfish, and Twofish
• MAC Algorithms: MD5, SHA1, SHA256
• Key Exchange Algorithms: Diffie-Hellman, group exchange with SHA-1 and SHA-256

Example:

• Change encryption algorithm

Task-based and Event-based Asynchronous Patterns

Our products support the latest Microsoft .NET Task-based Asynchronous Pattern introduced in Visual Studio 2012 - .NET 4.5. You can simply write your asynchronous methods using async and await (C#) or Async and Await (VB.NET) keywords. If you would like to use Event-based Asynchronous Pattern, this is also supported.

Some examples:

• Download remote files asynchronously