neoneo-go/pkg/crypto/hash/hash.go

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package hash
import (
"crypto/sha256"
"github.com/CityOfZion/neo-go/pkg/util"
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"golang.org/x/crypto/ripemd160"
)
// Sha256 hashes the incoming byte slice
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// using the sha256 algorithm.
func Sha256(data []byte) util.Uint256 {
hash := sha256.Sum256(data)
return hash
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}
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// DoubleSha256 performs sha256 twice on the given data.
func DoubleSha256(data []byte) util.Uint256 {
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var hash util.Uint256
h1 := Sha256(data)
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hash = Sha256(h1.BytesBE())
return hash
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}
// RipeMD160 performs the RIPEMD160 hash algorithm
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// on the given data.
func RipeMD160(data []byte) util.Uint160 {
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var hash util.Uint160
hasher := ripemd160.New()
_, _ = hasher.Write(data)
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hash, _ = util.Uint160DecodeBytesBE(hasher.Sum(nil))
return hash
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}
// Hash160 performs sha256 and then ripemd160
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// on the given data.
func Hash160(data []byte) util.Uint160 {
h1 := Sha256(data)
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h2 := RipeMD160(h1.BytesBE())
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return h2
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}
// Checksum returns the checksum for a given piece of data
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// using sha256 twice as the hash algorithm.
func Checksum(data []byte) []byte {
hash := DoubleSha256(data)
return hash[:4]
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}