SHA-1 is an important message digest. E.g. it is used by git. This implementation features:
- optimized standard implementation. E.g. if compiled with -O -inline -release then there is not single function call or loop.
* adds the new API used for hashes/digests
* adds new crc & md modules using this API
* deprecate std.md5 & crc32
* update std.stream to use new hash API