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identity: add implementation of ChainID #486

Merged
merged 2 commits into from
Jan 17, 2017
Merged

identity: add implementation of ChainID #486

merged 2 commits into from
Jan 17, 2017

Commits on Jan 11, 2017

  1. identity: add implementation of ChainID 

    The specification defines an algorithm to calculate a `ChainID`, which
can be used to identify the result of subsequent applications of layers.
Because this algorithm is subtle and only needs to implemented in a
single place, we provide a reference implementation.

For convenience, we provide functions that calculate all the chain ids
and just the top-level one. It is is integrated with the
distribution/digest type for safety and convenience.

As part of this, the `identity` package has been introduced. For
consuming code, a few helpers have been provide to ease transition as
the name of the upstream package has not yet been finalized. Users of
this package should employ `FromBytes`, `FromString` and `FromReader`
where appropriate, which should ease the transition if these packages
change.

Tests are formulated based on pre-calculation of chain identifiers to
ensure correctness.

Signed-off-by: Stephen J Day <[email protected]>
    @stevvooe
    stevvooe committed Jan 11, 2017
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  2. vendor: add go-digest to dependencies 

    Signed-off-by: Stephen J Day <[email protected]>
    @stevvooe
    stevvooe committed Jan 11, 2017
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