711f33450c
This is a backport of the chainhash package made in Decred along with a few additional things cleaned up, finished test coverage, and rewording of some documentation to make it more generic. In particular, the new package provides the definition of the hash type and associated hashing functions which will allow the rest of the code to be agnostic to the specific hash algorithm. This only implements the package and does not change any of the code base over to use it.
33 lines
922 B
Go
33 lines
922 B
Go
// Copyright (c) 2015 The Decred developers
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// Copyright (c) 2016 The btcsuite developers
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// Use of this source code is governed by an ISC
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// license that can be found in the LICENSE file.
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package chainhash
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import "github.com/btcsuite/fastsha256"
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// HashB calculates hash(b) and returns the resulting bytes.
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func HashB(b []byte) []byte {
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hash := fastsha256.Sum256(b)
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return hash[:]
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}
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// HashH calculates hash(b) and returns the resulting bytes as a Hash.
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func HashH(b []byte) Hash {
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return Hash(fastsha256.Sum256(b))
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}
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// DoubleHashB calculates hash(hash(b)) and returns the resulting bytes.
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func DoubleHashB(b []byte) []byte {
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first := fastsha256.Sum256(b)
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second := fastsha256.Sum256(first[:])
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return second[:]
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}
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// DoubleHashH calculates hash(hash(b)) and returns the resulting bytes as a
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// Hash.
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func DoubleHashH(b []byte) Hash {
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first := fastsha256.Sum256(b)
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return Hash(fastsha256.Sum256(first[:]))
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}
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