243 lines
7.1 KiB
Go
243 lines
7.1 KiB
Go
// Copyright 2015 The go-ethereum Authors
|
|
// This file is part of the go-ethereum library.
|
|
//
|
|
// The go-ethereum library is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Lesser General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// The go-ethereum library is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Lesser General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Lesser General Public License
|
|
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package common
|
|
|
|
import (
|
|
"encoding/hex"
|
|
"fmt"
|
|
"math/big"
|
|
"math/rand"
|
|
"reflect"
|
|
|
|
"github.com/ethereum/go-ethereum/common/hexutil"
|
|
"github.com/ethereum/go-ethereum/crypto/sha3"
|
|
)
|
|
|
|
const (
|
|
HashLength = 32
|
|
AddressLength = 20
|
|
)
|
|
|
|
var (
|
|
hashT = reflect.TypeOf(Hash{})
|
|
addressT = reflect.TypeOf(Address{})
|
|
)
|
|
|
|
// Hash represents the 32 byte Keccak256 hash of arbitrary data.
|
|
type Hash [HashLength]byte
|
|
|
|
func BytesToHash(b []byte) Hash {
|
|
var h Hash
|
|
h.SetBytes(b)
|
|
return h
|
|
}
|
|
func StringToHash(s string) Hash { return BytesToHash([]byte(s)) }
|
|
func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
|
|
func HexToHash(s string) Hash { return BytesToHash(FromHex(s)) }
|
|
|
|
// Get the string representation of the underlying hash
|
|
func (h Hash) Str() string { return string(h[:]) }
|
|
func (h Hash) Bytes() []byte { return h[:] }
|
|
func (h Hash) Big() *big.Int { return new(big.Int).SetBytes(h[:]) }
|
|
func (h Hash) Hex() string { return hexutil.Encode(h[:]) }
|
|
|
|
// TerminalString implements log.TerminalStringer, formatting a string for console
|
|
// output during logging.
|
|
func (h Hash) TerminalString() string {
|
|
return fmt.Sprintf("%x…%x", h[:3], h[29:])
|
|
}
|
|
|
|
// String implements the stringer interface and is used also by the logger when
|
|
// doing full logging into a file.
|
|
func (h Hash) String() string {
|
|
return h.Hex()
|
|
}
|
|
|
|
// Format implements fmt.Formatter, forcing the byte slice to be formatted as is,
|
|
// without going through the stringer interface used for logging.
|
|
func (h Hash) Format(s fmt.State, c rune) {
|
|
fmt.Fprintf(s, "%"+string(c), h[:])
|
|
}
|
|
|
|
// UnmarshalText parses a hash in hex syntax.
|
|
func (h *Hash) UnmarshalText(input []byte) error {
|
|
return hexutil.UnmarshalFixedText("Hash", input, h[:])
|
|
}
|
|
|
|
// UnmarshalJSON parses a hash in hex syntax.
|
|
func (h *Hash) UnmarshalJSON(input []byte) error {
|
|
return hexutil.UnmarshalFixedJSON(hashT, input, h[:])
|
|
}
|
|
|
|
// MarshalText returns the hex representation of h.
|
|
func (h Hash) MarshalText() ([]byte, error) {
|
|
return hexutil.Bytes(h[:]).MarshalText()
|
|
}
|
|
|
|
// Sets the hash to the value of b. If b is larger than len(h), 'b' will be cropped (from the left).
|
|
func (h *Hash) SetBytes(b []byte) {
|
|
if len(b) > len(h) {
|
|
b = b[len(b)-HashLength:]
|
|
}
|
|
|
|
copy(h[HashLength-len(b):], b)
|
|
}
|
|
|
|
// Set string `s` to h. If s is larger than len(h) s will be cropped (from left) to fit.
|
|
func (h *Hash) SetString(s string) { h.SetBytes([]byte(s)) }
|
|
|
|
// Sets h to other
|
|
func (h *Hash) Set(other Hash) {
|
|
for i, v := range other {
|
|
h[i] = v
|
|
}
|
|
}
|
|
|
|
// Generate implements testing/quick.Generator.
|
|
func (h Hash) Generate(rand *rand.Rand, size int) reflect.Value {
|
|
m := rand.Intn(len(h))
|
|
for i := len(h) - 1; i > m; i-- {
|
|
h[i] = byte(rand.Uint32())
|
|
}
|
|
return reflect.ValueOf(h)
|
|
}
|
|
|
|
func EmptyHash(h Hash) bool {
|
|
return h == Hash{}
|
|
}
|
|
|
|
// UnprefixedHash allows marshaling a Hash without 0x prefix.
|
|
type UnprefixedHash Hash
|
|
|
|
// UnmarshalText decodes the hash from hex. The 0x prefix is optional.
|
|
func (h *UnprefixedHash) UnmarshalText(input []byte) error {
|
|
return hexutil.UnmarshalFixedUnprefixedText("UnprefixedHash", input, h[:])
|
|
}
|
|
|
|
// MarshalText encodes the hash as hex.
|
|
func (h UnprefixedHash) MarshalText() ([]byte, error) {
|
|
return []byte(hex.EncodeToString(h[:])), nil
|
|
}
|
|
|
|
/////////// Address
|
|
|
|
// Address represents the 20 byte address of an Ethereum account.
|
|
type Address [AddressLength]byte
|
|
|
|
func BytesToAddress(b []byte) Address {
|
|
var a Address
|
|
a.SetBytes(b)
|
|
return a
|
|
}
|
|
func StringToAddress(s string) Address { return BytesToAddress([]byte(s)) }
|
|
func BigToAddress(b *big.Int) Address { return BytesToAddress(b.Bytes()) }
|
|
func HexToAddress(s string) Address { return BytesToAddress(FromHex(s)) }
|
|
|
|
// IsHexAddress verifies whether a string can represent a valid hex-encoded
|
|
// Ethereum address or not.
|
|
func IsHexAddress(s string) bool {
|
|
if hasHexPrefix(s) {
|
|
s = s[2:]
|
|
}
|
|
return len(s) == 2*AddressLength && isHex(s)
|
|
}
|
|
|
|
// Get the string representation of the underlying address
|
|
func (a Address) Str() string { return string(a[:]) }
|
|
func (a Address) Bytes() []byte { return a[:] }
|
|
func (a Address) Big() *big.Int { return new(big.Int).SetBytes(a[:]) }
|
|
func (a Address) Hash() Hash { return BytesToHash(a[:]) }
|
|
|
|
// Hex returns an EIP55-compliant hex string representation of the address.
|
|
func (a Address) Hex() string {
|
|
unchecksummed := hex.EncodeToString(a[:])
|
|
sha := sha3.NewKeccak256()
|
|
sha.Write([]byte(unchecksummed))
|
|
hash := sha.Sum(nil)
|
|
|
|
result := []byte(unchecksummed)
|
|
for i := 0; i < len(result); i++ {
|
|
hashByte := hash[i/2]
|
|
if i%2 == 0 {
|
|
hashByte = hashByte >> 4
|
|
} else {
|
|
hashByte &= 0xf
|
|
}
|
|
if result[i] > '9' && hashByte > 7 {
|
|
result[i] -= 32
|
|
}
|
|
}
|
|
return "0x" + string(result)
|
|
}
|
|
|
|
// String implements the stringer interface and is used also by the logger.
|
|
func (a Address) String() string {
|
|
return a.Hex()
|
|
}
|
|
|
|
// Format implements fmt.Formatter, forcing the byte slice to be formatted as is,
|
|
// without going through the stringer interface used for logging.
|
|
func (a Address) Format(s fmt.State, c rune) {
|
|
fmt.Fprintf(s, "%"+string(c), a[:])
|
|
}
|
|
|
|
// Sets the address to the value of b. If b is larger than len(a) it will panic
|
|
func (a *Address) SetBytes(b []byte) {
|
|
if len(b) > len(a) {
|
|
b = b[len(b)-AddressLength:]
|
|
}
|
|
copy(a[AddressLength-len(b):], b)
|
|
}
|
|
|
|
// Set string `s` to a. If s is larger than len(a) it will panic
|
|
func (a *Address) SetString(s string) { a.SetBytes([]byte(s)) }
|
|
|
|
// Sets a to other
|
|
func (a *Address) Set(other Address) {
|
|
for i, v := range other {
|
|
a[i] = v
|
|
}
|
|
}
|
|
|
|
// MarshalText returns the hex representation of a.
|
|
func (a Address) MarshalText() ([]byte, error) {
|
|
return hexutil.Bytes(a[:]).MarshalText()
|
|
}
|
|
|
|
// UnmarshalText parses a hash in hex syntax.
|
|
func (a *Address) UnmarshalText(input []byte) error {
|
|
return hexutil.UnmarshalFixedText("Address", input, a[:])
|
|
}
|
|
|
|
// UnmarshalJSON parses a hash in hex syntax.
|
|
func (a *Address) UnmarshalJSON(input []byte) error {
|
|
return hexutil.UnmarshalFixedJSON(addressT, input, a[:])
|
|
}
|
|
|
|
// UnprefixedHash allows marshaling an Address without 0x prefix.
|
|
type UnprefixedAddress Address
|
|
|
|
// UnmarshalText decodes the address from hex. The 0x prefix is optional.
|
|
func (a *UnprefixedAddress) UnmarshalText(input []byte) error {
|
|
return hexutil.UnmarshalFixedUnprefixedText("UnprefixedAddress", input, a[:])
|
|
}
|
|
|
|
// MarshalText encodes the address as hex.
|
|
func (a UnprefixedAddress) MarshalText() ([]byte, error) {
|
|
return []byte(hex.EncodeToString(a[:])), nil
|
|
}
|