security and cryptography library that includes a FTPS client, GnuPG wrapper, Windows smartcard API, and proxy clients

written in c# under LGPL3 official repository

nuget image: https://www.nuget.org/packages/starksoft.aspen

Gpg Features

• executes gpg.exe or gpg2.exe to sign, encrypt, decrypt with streams
• locates the GPG executable via registery or by user supplied path
• retrieve a collection or DataSet of the keys
• output ASCII Armor or Binary
• optional passphrases when decryption data.
• async methods

Proxy Features

• SOCKS 4, 4a, 5
• HTTP proxy
• factory abstraction
• open sockets supported by creating Tcpclient object and setting TcpClient.Client = socket and passing in the constructor

Smartcard Features

• p/invoke to WINSCARD.DLL
• send adpu commands to device (send and receive)
• list readers
• list cards

Ftpsclient Features

• FTP RFC 959 and RFC 1579
• FTP over SSL / TLS
• asynchronous methods
• active and passive mode
• configurable active port range
• zLib data compression
• upload and download file integrity support (CRC-32, SHA1, MD5) with server XCRC, XSHA1, and XMD5 commands
• FXP
• directory information as DataSet object or collection
• unix symbolic link and permission
• log transfer events
• exists() method
• recursive directory listing of files with GetDirListDeep()
• transfer files with streams
• ftp transfer restart
• throttle data transfers with MaxUploadSpeed and MaxDownloadSpeed
• HTTP and SOCKS v4, 4a, and 5 proxy server support
• pluggable directory parser for archaic FTP directory listings
• directory and file listing wildcards and regex filters
• file transfer progress events
• move files on the FTP server using the Move() method
• binary or ASCII mode
• adjust date and time to the correct time zone of local machine
• SIZE FTP server command to retrieve the size of the file on server
• IPv6 support (EPRT and EPSV)
• specify IPv4 or IPv6 mode
• specify a specific client IP address to use with PORT and EPRT commands
• FEATS support and Features property collection
• HASH and RANG file integrity verification
• XSHA256 and XSHA512 support when compiled with .net 4+
• MLST and MLSD for directory and file listings. Fall back on LIST
• GetFileInfo() method to option information about a specific file
• percent completed, time to completion, bytes to transfer values available in the transfer event
• MFMT and MFCT for setting the modified date/time and created date/time