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Added Appendix A - Hash function

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Hsiao-Wei Wang 2018-09-26 23:30:24 +08:00
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specs/casper_sharding_v2.1.md
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@ -441,5 +441,14 @@ Slashing conditions may include:
Proof of custody no secret reveal
RANDAO leak
# Appendix
## Appendix A - Hash function
The general hash function `hash(x)` in this specification is defined as:
`hash(x) := BLAKE2b(x)[0:32]`, where `BLAKE2b` algorithm is deifned in [RFC7693](https://tools.ietf.org/html/rfc7693) and input `x` is bytes type.
* The output of *default* `BLAKE2b` algorithm is a 64-byte type. To get a 32-byte result, the general hash function output is defined as the leftmost 32 bytes of `BLAKE2b` hash output.
* The design rationale is keeping using the default algorithm and avoiding too much dependency on external hash function libraries.
## Copyright
Copyright and related rights waived via [CC0](https://creativecommons.org/publicdomain/zero/1.0/).