61 lines
1.4 KiB
Go
61 lines
1.4 KiB
Go
// Copyright (c) 2015 The Decred developers
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// Copyright (c) 2016-2017 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 (
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"crypto/sha256"
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"crypto/sha512"
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"golang.org/x/crypto/ripemd160"
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)
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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 := sha256.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(sha256.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 := sha256.Sum256(b)
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second := sha256.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 := sha256.Sum256(b)
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return Hash(sha256.Sum256(first[:]))
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}
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// LbryPoWHashH calculates returns the PoW Hash.
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//
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// doubled := SHA256(SHA256(b))
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// expanded := SHA512(doubled)
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// left := RIPEMD160(expanded[0:32])
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// right := RIPEMD160(expanded[32:64])
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// result := SHA256(SHA256(left||right))
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func LbryPoWHashH(b []byte) Hash {
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doubled := DoubleHashB(b)
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expanded := sha512.Sum512(doubled)
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r := ripemd160.New()
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r.Reset()
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r.Write(expanded[:sha256.Size])
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left := r.Sum(nil)
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r.Reset()
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r.Write(expanded[sha256.Size:])
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combined := r.Sum(left)
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return DoubleHashH(combined)
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}
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