74 lines
1.8 KiB
Go
74 lines
1.8 KiB
Go
package hash
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import (
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"crypto/sha256"
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"encoding/binary"
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"github.com/nspcc-dev/neo-go/pkg/util"
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"golang.org/x/crypto/ripemd160"
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)
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// Hashable represents an object which can be hashed. Usually these objects
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// are io.Serializable and signable. They tend to cache the hash inside for
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// effectiveness, providing this accessor method. Anything that can be
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// identified with a hash can then be signed and verified.
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type Hashable interface {
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Hash() util.Uint256
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}
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func getSignedData(net uint32, hh Hashable) []byte {
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var b = make([]byte, 4+32)
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binary.LittleEndian.PutUint32(b, net)
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h := hh.Hash()
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copy(b[4:], h[:])
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return b
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}
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// NetSha256 calculates network-specific hash of Hashable item that can then
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// be signed/verified.
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func NetSha256(net uint32, hh Hashable) util.Uint256 {
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return Sha256(getSignedData(net, hh))
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}
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// Sha256 hashes the incoming byte slice
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// using the sha256 algorithm.
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func Sha256(data []byte) util.Uint256 {
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hash := sha256.Sum256(data)
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return hash
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}
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// DoubleSha256 performs sha256 twice on the given data.
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func DoubleSha256(data []byte) util.Uint256 {
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var hash util.Uint256
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h1 := Sha256(data)
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hash = Sha256(h1.BytesBE())
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return hash
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}
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// RipeMD160 performs the RIPEMD160 hash algorithm
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// on the given data.
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func RipeMD160(data []byte) util.Uint160 {
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var hash util.Uint160
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hasher := ripemd160.New()
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_, _ = hasher.Write(data)
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hash, _ = util.Uint160DecodeBytesBE(hasher.Sum(nil))
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return hash
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}
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// Hash160 performs sha256 and then ripemd160
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// on the given data.
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func Hash160(data []byte) util.Uint160 {
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h1 := Sha256(data)
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h2 := RipeMD160(h1.BytesBE())
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return h2
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}
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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.
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func Checksum(data []byte) []byte {
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hash := DoubleSha256(data)
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return hash[:4]
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}
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