I have been working on implementations of the SHA and FNV-1a class of hashing algorithms. Both are header-only. SHA (Secure Hash Algorithms) Implementations for SHA-1, -224, -256, -384, and -512. It does not implement the more recent SHA-3 (Keccak) algorithm. It would not be difficult to add support for 512/224 and 512/256 if they were desired. The routines support bit-level messages, meaning they can correctly digest messages that do not end on a byte boundary. More information here: http://en.wikipedia.org/wiki/Secure_Hash_Algorithm FNV (Fowler–Noll–Vo) The header supports the FNV-1a algorithm, which has better distribution characteristics than its cousin, FNV-1. I have added support for 32-, 64-, 128-, 256-, and 1024-bit variants. This is not a cryptographically secure algorithm, however is much faster than its crypto cousins and as such is a solid algorithm for obtaining unique hash values for e.g., data structures. I have also implemented a constexpr variant of the algorithm (32-bit and 64-bit only) for const char* to further performance when needed by pushing the hash to compile-time computation. More information here: http://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function The algorithms are currently part of the Adobe Source Libraries on GitHub: SHA: https://github.com/stlab/adobe_source_libraries/blob/sha_cleanup/adobe/sha.h... (note: the master branch version needs updating to this one.) FNV-1a: https://github.com/stlab/adobe_source_libraries/blob/master/adobe/fnv.hpp Would these algorithms be of general use to the Boost community? If so I would be willing to submit them formally.