Libmcrypt is a thread-safe library providing a uniform interface to access several block and stream encryption algorithms.
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Mhash is a free library which provides a uniform interface to a large number of hash algorithms. These algorithms can be used to compute checksums, message digests, and other signatures. The HMAC support implements the basics for message authentication, following RFC 2104. In the later versions some key generation algorithms, which use hash algorithms, have been added. Currently, the library supports the algorithms: ADLER32, GOST, HAVAL256, HAVAL224, HAVAL192, HAVAL160, HAVAL128, MD5, MD4, MD2, RIPEMD128/160/256/320, TIGER, TIGER160, TIGER128, SHA1/224/256/384/512, Whirlpool, SNEFRU128/256, CRC32B and CRC32 checksums.
A backend for managing encrypted data files on the disk
libGringotts is a small, easy-to-use, thread-safe C library originally developed for Gringotts; its purpose is to encapsulate data (generic: ASCII, but also binary data) in an encrypted and compressed structure, to be written in a file or used elseway. It makes use of strong encryption algorithms, to ensure the data are as safe as possible, and allow the user to have the complete control over all the algorithms used in the process.