Best selling POP3/SMTP email .NET component for C#, VB.NET, and ASP.NET. Best selling Zip .NET component for C#, VB.NET, and ASP.NET. HTTP client component for communicating with HTTP servers.

.NET encryption component for C#, VB.NET, ASP.NET:

Symmetric Encryption: AES, ChaCha20, Blowfish, Twofish, RC2, ARC4, DES, 3DES, PBES1, PBES2.
Hash Algorithms: SHA-1, SHA256, SHA384, SHA512, MD2, MD4, MD5, HAVAL.
Hash Algorithms: RIPEMD128, RIPEMD160, RIPEMD256, RIPEMD320.
Encoding: Base64, hex, quoted-printable, URL-encoding, modBase64, base32, base58, uu, url_oauth, url_rfc1738, url_rfc2396, url_rfc3986, fingerprint, decimal.
HMAC with any supported hash algorithm: HMAC-MD5, HMAC-SHA1, etc.
Poly1305 Message Authentication Code
Password-based Key Derivation Functions: PBKDF1, PBKDF2
PKCS7 -- P7S and P7M creation, decryption, verification.
Public key encryption/decryption with digital certificates.
Digital signature creation/verification with digital certificates.
Bzip2 in-memory compression.
Encrypt / decrypt strings or byte data.
Return encrypted data as Base64, quoted-printable, or hex-encoded strings.
Hash strings or binary data using SHA1, MD2, MD5, HAVAL, SHA384, or SHA512.
Public-key encryption with digital certificates.
Create and verify digital signatures.
Pre-convert Unicode strings to ANSI (single-byte/char) before encrypting.
Pre-convert Unicode strings to any charset before encrypting, compressing, or hashing.
Base64 encode strings or byte data.
Hex-encode encode strings or byte data.
Compress strings or byte data with the BZIP2 compression algorithm.
Implements FIPS81 padding scheme for AES.
Up to 256-bit encryption is supported.
Set binary secret-key directly for symmetric encryption algorithms.
Initialization vectors.
CBC Cipher Block Chaining Mode
ECB Electronic Cookbook Mode
OFB Output Feedback Mode
CFB Cipher Feedback Mode
GCM Galois/Counter Mode (AEAD)
CTR Counter Mode
Punycode Encoding/Decoding
Generate UUIDs
Random byte data generation.
Streaming hashing (pass data to hashing functions in chunks).
Streaming encryption (pass data to encryption functions in chunks).
Thread safe.

DSA Features

Create and verify DSA signatures.
Generate DSA keys.
Generate DSA keys based on parameters created by OpenSSL.
Set public key explicitly from P, Q, G, and Y values.
Set private key explicitly from P, Q, G, and X values.
Provides access to P, Q, G, X, and Y as hex-encoded SSH1-format bignums.
Import public/private DSA keys from DER.
Import public/private DSA keys from PEM.
Import encrypted private DSA keys from PEM.
Import public/private DSA keys from XML.
Export public/private DSA keys to DER.
Export public/private DSA keys to PEM.
Export encrypted private DSA keys to PEM.
Export public/private DSA keys to XML.

Diffie-Hellman Features

Simple 2-step Method for Computing a Shared Secret
Safe prime generation. Generate new P and G values.
Ability to use Known Primes from RFC 2409 and RFC 3526 (Oakley and MODP groups)

ZIP64 format extensions supported. No limitations on size for files within a .zip, or the total size of a .zip.
No limitations on the number of files that may be contained within a single .zip (this is a ZIP64 feature).
Can read/write Zips with WinZip-compatible AES strong encryption.
Supports Unicode filename zip file format extensions.
Events for zip/unzip progress monitoring.
Zip an entire directory tree.
Append entries to a Zip from in-memory data.
Create or open in-memory Zips.
Create self-extracting executables.
Create password-protected Zip files.
Unzip only files that match a filename pattern.
Option to discard path information when zipping.
Option to append a path prefix when zipping.
Option to create self-extracting EXEs with or without interfaces.
Ability to customize icon and interface when creating an EXE.
Ability to specify an auto-run file when creating an EXE.
Ability to specify a pre-defined unzip directory for an EXE.
Handles Unicode filenames.
Provides in-memory access to compressed or uncompressed data.
Easy FirstEntry/NextEntry methods for iterating over a Zip.
Can embed Zips in your own EXEs.
OpenMyEmbedded opens the Zip that has been embedded in the caller's EXE.
Set exclusion patterns when zipping.
Option to specify a target directory and discard path information when unzipping.
Can unzip only files that are newer.
Read/write comments within a Zip.
Ability to inflate directly to in-memory byte array or string.
Includes a Bz2 object/class to create or decompress the .bz2 file format.
Includes a GZip object/class to create or decompress the .gz file format.
Includes a Unix compress object/class to create or decompress the .Z file format using LZW compression.
Thread safe.


SMTP client for sending email.
POP3 client for reading email.
Works with Exchange Server (all versions)
Works with all POP3 / SMTP servers
Supports POP3 and SMTP SSL/TLS connections.
SMTP STARTTLS
Supports POP3 and SMTP SSH tunneling (port forwarding).
Send S/MIME signed and/or encrypted email.
Read S/MIME signed and/or encrypted email.
Export and import email to XML.
Export and import email to .eml (MIME) text files.
Zip / unzip attachments in-memory.
Check for email on servers.
Verify POP3 / SMTP connections and login credentials.
Secure SMTP authentication methods suppoted.
Add attachments from files or in-memory data.
Set connection and read timeouts.
Set size limits when reading email.
Delete email on the POP3 server.
Copy email from a POP3 server without deleting.
Fetch email headers.
Events for send/receive progress monitoring.
Get UIDLs of email on a server.
Send email using Chilkat SMTPQ for background sending.
Download email and sort based on date, sender, recipient, or subject.
Set a bounce email address for handling bounces.
Automatically handles international charset encodings.
Can use file-based distribution lists.
Send HTML email with embedded images.
Send multipart/alternative emails with both HTML and plain-text bodies.
Access attached message/rfc822 sub-parts.
Acess attachment data in-memory.
Set replacement patterns for mail-merge.
Set return receipt.
Set priority via the X-Priority header field.
Add custom header fields.
Add recipients as To, CC, or BCC.
Save attachments to disk.
Get attachment information: filename, size, etc.
Return text file attachment data as an in-memory string.
Get digital certificate information for signed/encrypted email.
Enumerate over the header fields in an email.
Find and unobfuscate the linked domain names in an email.
Unobfuscate HTML email.
MX Domain Lookup
Explicit control over SMTP and POP3 sessions.
SOCKS4, SOCKS5 proxy support for both POP3 and SMTP.
HTTP proxy support for POP3 and SMTP
Thread safe.


Send GET, POST, or HEAD requests to an HTTP server.
Supports SSL/TLS.
HTTP DELETE and PUT.
Resume interrupted download capability.
Progress monitoring and abort capabilities (event callbacks).
Save cookies to a persistant XML-based file store.
Automatic save and re-send cookies from file or memory cookie storage.
Automatically add cookies from a persistent file store to HTTP requests.
Sophisticated caching capabilities.
Cache can extend across multiple hard drives.
Basic HTTP authentication (login/password).
NTLM (Windows-Integrated) authentication.
Kerberos, and Negotiate Authentication
Supports HTTP proxies w/ proxy authentication.
SOCKS4 and SOCKS5 proxy support.
Two caching algorithms: LMFactor and constant-freshness.
Automatically follow redirects.
Read and connect timeout properties.
Custom HTTP request headers.
Handles international (non-English) web pages including Asian and Middle Eastern languages.
Automatically manages a pool of connections with HTTP servers.
Mimic FireFox or Internet Explorer.
Supports client-side certificates for SSL.
Provides access to all HTTP response header fields.
XMLHTTP
Multipart/form-data for easy uploads to HTTP server.
POST XML
HTTP PUT
HTTP DELETE
Resume (re-start) Downloads
XML RPC
Client-side SSL Certificates
Custom header fields
Thread safe.
.NET FTP Component for C#, VB.NET, and ASP.NET.

FTP files directly from your application in synchronous or asynchronous mode.
Support for FTPS - FTP over TLS 1.2, 1.1, 1.0, and SSL 3.0
Supports both Explicit and Implicit SSL/TLS
All popular FTP servers and proxies are supported.
Resume (restart) FTP uploads and downloads
Automatically handles One-Time Password (OTP), also known as S/KEY authentication.
Supports international filenames in all major languages
Supports all versions of the .NET Framework, both 32-bit and 64-bit.
Upload and download to or from in-memory strings or byte arrays.
Automatic directory listing parser for FTP servers on Unix, Windows, Netware, AS/400, VAX/VMS, IBM Mainframes, and other legacy formats.
Events for upload/download progress monitoring.
Session logging
XCRC verification of uploads and downloads
Mode-Z compression
Synchronize local directory tree with remote directory tree in either direction
All operations are abortable
Heartbeat event callbacks with abort cabability
Real-time upload/download data transfer rate properties
Real-time #bytes received/sent properties for async transfers
Percentage completion events for uploads and downloads
Secure FTP (FTPES) using AUTH TLS or AUTH SSL
Implicit Secure FTP SSL on Port 990 (or whichever port is used by the FTP server for SSL/TLS)
Clear the Control Channel (CCC) after FTPS Authentication
Supports FTPS behind Network Address Translating (NAT) Routers such as DSL/Cable Modems
Delete an entire remote directory tree in a single line of code
Upload an entire directory tree in a single line of code
Download an entire remote directory tree in a single line of code
Copy remote files to your local filesystem.
Copy files from your local filesystem to the FTP server.
Download text and binary files and access directly in memory.
Upload to FTP site directly from memory.
Create remote directory.
Rename remote files and directories.
Delete remote files and directories.
Get remote directory listing as XML.
Support for asynchronous uploads and downloads.
Active and passive transfer modes.
Binary and ASCII transfers.
FTP proxy servers are supported.
SOCKS4/SOCKS5 proxy support.
Server specific commands supported (SITE command) - such as setting access permissions on Unix FTP servers.
Stream support - streaming download to local files, streaming upload from local files.
Large file support - upload or download files larger than 4 GB.
Auto-determine proxy settings
Auto-determine valid connection settings
Specify port range for PORT mode data transfers (i.e. Active mode).
Supports QUOTE and SYST
Allows for client SSL certificate to be used for SSL connections.
Provides access to FTP SSL server certificate for verification.
Royalty-free licensing
License covers all programming languages: .NET, ActiveX, C++, Ruby, Perl, Python, Java, etc.

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