| # Hashers |
| |
| Hashers take a stream of bytes (of arbitrary length) and produce a fixed length |
| value - the hash. For example, the CRC-32/IEEE hashing algorithm produces a 32 |
| bit value (a `base.u32`). The MD5 hashing algorithm produces a 128 bit value. |
| |
| Wuffs' hasher implementations have only one method. For 32 bit hashes, the |
| method signature is `update_u32!(x: slice base.u8) base.u32`. It incrementally |
| updates the hasher object's state with the addition data `x`, and returns the |
| hash value so far, for all of the data up to and including `x`. |
| |
| This method is stateful. Calling `update_u32` twice with the same slice of |
| bytes can produce two different hash values. Conversely, calling `update_u32` |
| twice with two different slices should be equivalent to calling it once on |
| their concatenation. [Re-initialize](/doc/note/initialization.md) the object to |
| reset the state. |
| |
| |
| ## Implementations |
| |
| - [std/adler32](/std/adler32) |
| - [std/crc32](/std/crc32) |
| |
| |
| ## Examples |
| |
| - [example/crc32](/example/crc32) |
| |
| |
| --- |
| |
| See also the general remarks on [Wuffs' standard library](/doc/std/README.md). |
