File: util.go

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tendermint-go-p2p 0.0~git20170113.0.3d98f67-1
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package p2p

import (
	"crypto/sha256"
)

// doubleSha256 calculates sha256(sha256(b)) and returns the resulting bytes.
func doubleSha256(b []byte) []byte {
	hasher := sha256.New()
	hasher.Write(b)
	sum := hasher.Sum(nil)
	hasher.Reset()
	hasher.Write(sum)
	return hasher.Sum(nil)
}