ebCrypt

ebCrypt is set of lightweight ActiveX components that make strong encryption algorithms available to VisualBasic, VBScript, JScript and other applications/development environment capable of using automation components.

ebCrypt can be used from virtually any MS Tool or application, such as Visual Basic, Visual Basic for Applications, ASP, etc. ebCrypt components are wrapper components, that do not implement encryption algorithms themselves, but rather use open source library of cryptographic algorithms -- SSLeay. The advantage is that you get immediate access to the proven implementation of the algorithms.
Features:
- Symmetrical encryption algorithms: IDEA, BLOWFISH, CAST5, DES, 3DES, RIJNDAEL, SERPENT, TWOFISH
- Hashing algorithms: MD5, RIPEMD160, SHA1
- Diffie-Hellman key exchange protocol;
- DSA public/private key support, including key generation, export/import and digital signatured;
- RSA public/private key support, including key generation, export/import and digital signatured;
- X.509 Public key certificate support;
- Other: high level functions provided to do one function call file encryption/decryption, conversion to hex and base64 strings.