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34 lines
815 B
Go
34 lines
815 B
Go
package hashutil
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import (
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"golang.org/x/crypto/sha3"
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)
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// Hash defines a function that returns the
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// Keccak-256/SHA3 hash of the data passed in.
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// https://github.com/ethereum/eth2.0-specs/blob/master/specs/core/0_beacon-chain.md#appendix
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func Hash(data []byte) [32]byte {
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var hash [32]byte
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h := sha3.NewLegacyKeccak256()
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// The hash interface never returns an error, for that reason
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// we are not handling the error below. For reference, it is
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// stated here https://golang.org/pkg/hash/#Hash
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// #nosec G104
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h.Write(data)
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h.Sum(hash[:0])
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return hash
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}
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// RepeatHash applies the Keccak-256/SHA3 hash function repeatedly
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// numTimes on a [32]byte array.
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func RepeatHash(data [32]byte, numTimes uint64) [32]byte {
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if numTimes == 0 {
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return data
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}
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return RepeatHash(Hash(data[:]), numTimes-1)
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}
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