57 lines
1.4 KiB
Go
57 lines
1.4 KiB
Go
package node
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import (
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"crypto/sha256"
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"encoding/binary"
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"strconv"
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"github.com/lbryio/lbcd/chaincfg/chainhash"
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"github.com/lbryio/lbcd/wire"
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)
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func HashMerkleBranches(left *chainhash.Hash, right *chainhash.Hash) *chainhash.Hash {
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// Concatenate the left and right nodes.
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var hash [chainhash.HashSize * 2]byte
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copy(hash[:chainhash.HashSize], left[:])
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copy(hash[chainhash.HashSize:], right[:])
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newHash := chainhash.DoubleHashH(hash[:])
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return &newHash
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}
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func ComputeMerkleRoot(hashes []*chainhash.Hash) *chainhash.Hash {
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if len(hashes) <= 0 {
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return nil
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}
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for len(hashes) > 1 {
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if (len(hashes) & 1) > 0 { // odd count
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hashes = append(hashes, hashes[len(hashes)-1])
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}
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for i := 0; i < len(hashes); i += 2 { // TODO: parallelize this loop (or use a lib that does it)
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hashes[i>>1] = HashMerkleBranches(hashes[i], hashes[i+1])
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}
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hashes = hashes[:len(hashes)>>1]
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}
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return hashes[0]
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}
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func calculateNodeHash(op wire.OutPoint, takeover int32) *chainhash.Hash {
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txHash := chainhash.DoubleHashH(op.Hash[:])
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nOut := []byte(strconv.Itoa(int(op.Index)))
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nOutHash := chainhash.DoubleHashH(nOut)
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buf := make([]byte, 8)
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binary.BigEndian.PutUint64(buf, uint64(takeover))
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heightHash := chainhash.DoubleHashH(buf)
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h := make([]byte, 0, sha256.Size*3)
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h = append(h, txHash[:]...)
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h = append(h, nOutHash[:]...)
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h = append(h, heightHash[:]...)
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hh := chainhash.DoubleHashH(h)
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return &hh
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}
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