Botan - An open-source C++ crypto library that includes block and stream ciphers, hash functions, MACs, and public key algorithms, along with an easy to use filter-based interface. Cryptlib Encryption Toolkit - A powerful security toolkit which allows even inexperienced crypto programmers to easily add encryption and authentication services to their software. OpenSSL - A collaborative effort to develop a robust, commercial-grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. Network Security Services - Mozilla's NSS, is a set of libraries designed to support cross-platform development of security-enabled server applications. SecureBlackbox homepage - A component collection that adds SSL/TLS, FTPS, HTTPS, SSH, PKI, SFTP, PGP, PDF, S/MIME, XML support to .NET, Windows and Linux applications. Crypto++ - Free library of cryptographic schemes: includes ciphers, message authentication codes, one-way hash functions, public-key cryptosystems, and key agreement schemes. JavaScript Encryption Program - Open source JavaScript implementation of the MD5 hash and RC4, AES, CSR and RSA ciphers. Hidden Field Equations (HFE) in Java - A free implementation of the public key cryptography system with source code and documentation. QuartzLight in Java - Implements the public key signature system QuartzLight in Java where QuartzLight refers to a research version of the Quartz standard. FastCRC Library - Optimized implementation of CRC32, CRC16 and CRC16C (CRC-CCITT) checksum algorithms. With examples in C/C++ and Visual Basic. libmcrypt - Implements an interface to access block and stream encryption algorithms. Includes a full list of algorithms supported. ANSI C. Applied Cryptography Code - The code from the Applied Cryptography disk, available outside the US. RC-Crypt - Implementation of RC5 (128) in C. MD5 Homepage (unofficial) - Information and implementation in various languages. SSL++ -- C++ Wrapper around OpenSSL library - SSL++ is simple C++ library encapsulating OpenSSL functionality to make it simple and easily accessible to C++ programmers. SlavaSoft QuickHash Library - Allows hash, checksum and HMAC calculations to be added to Windows applications. C++, commercial. Entrust Dev-Net - A variety of tools to add PKI functionality to your application. DevOTechS: Huge Integer Math and Encryption Library (HIME) - A dll for implementing public and secret key encryption using RSA, AES, SHA-256. Also contains functions for prime number generation, random number generation and huge integer operations. Punkroy and the Cypher Project - Collection of programming examples on encryption including: file encryption, steganography in images and sound, data base record encryption, and password verification. All written in Pascal, all source code available. Komodia Inc. - Offers SSL interception module to decode and modify SSL traffic on Windows OS. Sysepub - An open-source Java cipher that combines one time pad with public and private keys.