Commits on Jun 9, 2020

1. digest: add FixedOutputDirty trait + finalize_into* …

   Adds a `FixedOutputDirty` trait which writes the digest output to a
   provided byte array, but does not reset the internal state. This is
   intended for implementations to use in order to ensure that they are
   not reset in the event the instance is consumed.
   
   Also adds a set of `finalize_into` and `finalize_into_reset` methods to
   `FixedOutput` whhich also write their input into a provided byte array,
   and changes the existing `finalize_fixed` (and newly added
   `finalize_fixed_reset`) methods to have a default implementation which
   returns a byte array allocated on the stack.
   
   Finally, adds a blanket impl of `FixedOutput` for `FixedOutputDirty` +
   `Reset` types which handles safely invoking the underlying
   implementation by either consuming the instance (avoiding a reset)
   or borrowing the hasher, obtaining the output, and resetting.

   

   tarcieri committed Jun 9, 2020
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