neoneo-go/pkg/wire/util/uint160.go

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2019-02-25 22:44:14 +00:00
package util
import (
"crypto/sha256"
"encoding/hex"
"encoding/json"
"fmt"
"github.com/CityOfZion/neo-go/pkg/wire/util/slice"
"golang.org/x/crypto/ripemd160"
)
const uint160Size = 20
// Uint160 is a 20 byte long unsigned integer.
type Uint160 [uint160Size]uint8
// Uint160DecodeString attempts to decode the given string into an Uint160.
func Uint160DecodeString(s string) (u Uint160, err error) {
if len(s) != uint160Size*2 {
return u, fmt.Errorf("expected string size of %d got %d", uint160Size*2, len(s))
}
b, err := hex.DecodeString(s)
if err != nil {
return u, err
}
return Uint160DecodeBytes(b)
}
// Uint160DecodeBytes attempts to decode the given bytes into an Uint160.
func Uint160DecodeBytes(b []byte) (u Uint160, err error) {
if len(b) != uint160Size {
return u, fmt.Errorf("expected byte size of %d got %d", uint160Size, len(b))
}
for i := 0; i < uint160Size; i++ {
u[i] = b[i]
}
return
}
// Uint160FromScript returns a Uint160 type from a raw script.
func Uint160FromScript(script []byte) (u Uint160, err error) {
sha := sha256.New()
sha.Write(script)
b := sha.Sum(nil)
ripemd := ripemd160.New()
ripemd.Write(b)
b = ripemd.Sum(nil)
return Uint160DecodeBytes(b)
}
// Bytes returns the byte slice representation of u.
func (u Uint160) Bytes() []byte {
b := make([]byte, uint160Size)
for i := 0; i < uint160Size; i++ {
b[i] = byte(u[i])
}
return b
}
// BytesReverse return a reversed byte representation of u.
func (u Uint160) BytesReverse() []byte {
return slice.Reverse(u.Bytes())
}
// String implements the stringer interface.
func (u Uint160) String() string {
return hex.EncodeToString(u.Bytes())
}
// Equals returns true if both Uint256 values are the same.
func (u Uint160) Equals(other Uint160) bool {
for i := 0; i < uint160Size; i++ {
if u[i] != other[i] {
return false
}
}
return true
}
// MarshalJSON implements the json marshaller interface.
func (u Uint160) MarshalJSON() ([]byte, error) {
return json.Marshal(
fmt.Sprintf("0x%s", hex.EncodeToString(slice.Reverse(u.Bytes()))),
)
}