Cryptlib by Peter Gutmann is a security toolkit that
allows even less experienced programmers to add strong
encryption and authentication services to their
programs, security features that are becoming more and
more indispensable. The library attempts to hide the
low-level details of encryption/decryption and
authentication from programmers, allowing them to
quickly make their projects more secure. Some of the
symmetric encryption (private key) and authentication
algorithms that cryptlib supports include the
following:

· AES (Rijndael)
· Blowfish
· DES, 3DES
· RC2, RC4, RC5

The following hash algorithms are available in the
library:

· MD2, MD4, MD5
· RIPEMD-160
· SHA

It offers services such as:

· S/MIME
· SSL/TLS
· ssh

It features various hashed message authentication code
algorithms:

· HMAC-MD5, HMAC-SHA, HMAC-RIPEMD-160

Finally, asymmetric (public/private key) encryption
algorithms such as the following are available:

· Diffie-Hellman, DSA, RSA

cryptlib can also be used with a variety of crypto
devices (for example, Fortezza cards and Smart cards).

The library is free if used in personal, freeware, or
shareware projects. The library is written in C.
ActiveX and C++ wrappers are provided. The project is
OSI Certified Open Source Software.

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