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e3ba3e181c
* Remove leaf hashing in MerkleRoot function See https://github.com/ethereum/eth2.0-specs/pull/646 for clarification. * Add comment clarifying leaf hashing removal
27 lines
829 B
Go
27 lines
829 B
Go
package hashutil
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// MerkleRoot derives the merkle root from a 2d byte array with each element
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// in the outer array signifying the data that is to be represented in the
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// merkle tree.
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// Note: This function is only used to merklize a list of block root hashes.
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// As such, we assume the input comes pre-hashed and do NOT hash the leaves.
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// Spec:
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// def merkle_root(values):
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// o = [0] * len(values) + values
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// for i in range(len(values)-1, 0, -1):
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// o[i] = hash(o[i*2] + o[i*2+1])
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// return o[1]
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func MerkleRoot(values [][]byte) []byte {
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length := len(values)
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newSet := make([][]byte, length, length*2)
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newSet = append(newSet, values...)
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for i := length - 1; i >= 0; i-- {
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concatenatedNodes := append(newSet[i*2], newSet[i*2+1]...)
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hash := Hash(concatenatedNodes)
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newSet[i] = hash[:]
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}
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return newSet[1]
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}
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