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Auto merge of rust-lang#38960 - arielb1:blake-endian, r=michaelwoerister
Use little-endian encoding for Blake2 hashing on all architectures Like many hash functions, the blake2 hash is mathematically defined on a sequence of 64-bit words. As Rust's hash interface operates on sequences of octets, some encoding must be used to bridge that difference. The Blake2 RFC (RFC 7693) specifies that: ``` Byte (octet) streams are interpreted as words in little-endian order, with the least-significant byte first. ``` So use that encoding consistently. Fixes rust-lang#38891. Beta-nominating since this is a regression since 1.15. r? @michaelwoerister
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