Cryptoapi

Fast, highly optimized implementation of symmetric (private-key) encryption algorithms: DES, Triple DES (3DES), DESX, BLOWFISH, RIJNDAEL (AES-Advanced Encryption Standard), GOST. Supports 5 modes of operation. Allows to encrypt/decrypt files, memory blocks, strings, streaming data. Supports 2 interfaces: API and C++. Has no external dependencies such as MFC DLL, COM/DCOM or other component. The help file has examples in Visual Basic(VB),C,C++.

SecureBlackbox (ActiveX/DLL edition) is a comprehensive component collection that adds support for PGP, SSL/TLS, SSH, PKI, SFTP to your Windows application. SecureBlackbox primary goal is to provide basic technology for the wide range of applications, hiding the details of low-level protocols and algorithms, used by the parties during secure conversations. This is ActiveX/DLL version.