forked from TrueCloudLab/neoneo-go
c1b1b6fca4
With associated test and drop duplicating Uint160 implementation from _pkg.dev. It doesn't seem to be used in pkg code at the moment, but still it can be useful. Refs #307.
95 lines
2.3 KiB
Go
95 lines
2.3 KiB
Go
package util
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import (
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"strings"
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"golang.org/x/crypto/ripemd160"
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)
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const uint160Size = 20
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// Uint160 is a 20 byte long unsigned integer.
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type Uint160 [uint160Size]uint8
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// Uint160DecodeString attempts to decode the given string into an Uint160.
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func Uint160DecodeString(s string) (Uint160, error) {
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var u Uint160
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if len(s) != uint160Size*2 {
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return u, fmt.Errorf("expected string size of %d got %d", uint160Size*2, len(s))
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}
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b, err := hex.DecodeString(s)
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if err != nil {
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return u, err
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}
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return Uint160DecodeBytes(b)
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}
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// Uint160DecodeBytes attempts to decode the given bytes into an Uint160.
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func Uint160DecodeBytes(b []byte) (u Uint160, err error) {
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if len(b) != uint160Size {
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return u, fmt.Errorf("expected byte size of %d got %d", uint160Size, len(b))
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}
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copy(u[:], b)
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return
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}
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// Uint160FromScript returns a Uint160 type from a raw script.
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func Uint160FromScript(script []byte) (u Uint160, err error) {
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sha := sha256.New()
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sha.Write(script)
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b := sha.Sum(nil)
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ripemd := ripemd160.New()
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ripemd.Write(b)
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b = ripemd.Sum(nil)
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return Uint160DecodeBytes(b)
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}
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// Bytes returns the byte slice representation of u.
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func (u Uint160) Bytes() []byte {
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return u[:]
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}
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// BytesReverse return a reversed byte representation of u.
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func (u Uint160) BytesReverse() []byte {
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return ArrayReverse(u.Bytes())
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}
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// String implements the stringer interface.
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func (u Uint160) String() string {
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return hex.EncodeToString(u.Bytes())
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}
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// ReverseString is the same as String, but returnes an inversed representation.
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func (u Uint160) ReverseString() string {
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return hex.EncodeToString(u.BytesReverse())
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}
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// Equals returns true if both Uint256 values are the same.
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func (u Uint160) Equals(other Uint160) bool {
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return u == other
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}
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// UnmarshalJSON implements the json unmarshaller interface.
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func (u *Uint160) UnmarshalJSON(data []byte) (err error) {
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var js string
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if err = json.Unmarshal(data, &js); err != nil {
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return err
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}
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js = strings.TrimPrefix(js, "0x")
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*u, err = Uint160DecodeString(js)
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return err
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}
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// Size returns the lenght of the bytes representation of Uint160
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func (u Uint160) Size() int {
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return uint160Size
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}
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// MarshalJSON implements the json marshaller interface.
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func (u Uint160) MarshalJSON() ([]byte, error) {
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return []byte(`"0x` + u.String() + `"`), nil
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}
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