/
hash.go
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/
hash.go
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package types
import (
"database/sql/driver"
"encoding/hex"
"fmt"
"github.com/DhunterAO/goAuthChain/common/hexutil"
types2 "github.com/DhunterAO/goAuthChain/common/types"
"github.com/DhunterAO/goAuthChain/crypto/sha3"
"math/big"
"math/rand"
"reflect"
"time"
)
// HashLength is the expected length of the hash
const HashLength = 32
// Hash represents the 32 byte Keccak256 hash of arbitrary data.
type Hash [HashLength]byte
var hashT = reflect.TypeOf(Hash{})
// BytesToHash sets b to hash.
// If b is larger than len(h), b will be cropped from the left.
func BytesToHash(b []byte) Hash {
var h Hash
h.SetBytes(b)
return h
}
// BigToHash sets byte representation of b to hash.
// If b is larger than len(h), b will be cropped from the left.
func BigToHash(b *big.Int) Hash { return BytesToHash(b.Bytes()) }
// HexToHash sets byte representation of s to hash.
// If b is larger than len(h), b will be cropped from the left.
func HexToHash(s string) Hash { return BytesToHash(types2.FromHex(s)) }
// Bytes gets the byte representation of the underlying hash.
func (h Hash) Bytes() []byte { return h[:] }
// Big converts a hash to a big integer.
func (h Hash) Big() *big.Int { return new(big.Int).SetBytes(h[:]) }
// Hex converts a hash to a hex string.
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()
}
// SetBytes 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)
}
// 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)
}
// Scan implements Scanner for database/sql.
func (h *Hash) Scan(src interface{}) error {
srcB, ok := src.([]byte)
if !ok {
return fmt.Errorf("can't scan %T into Hash", src)
}
if len(srcB) != HashLength {
return fmt.Errorf("can't scan []byte of len %d into Hash, want %d", len(srcB), HashLength)
}
copy(h[:], srcB)
return nil
}
// Value implements valuer for database/sql.
func (h Hash) Value() (driver.Value, error) {
return h[:], nil
}
// 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
}
// RandHash generates random hash value used for test
func RandHash() *Hash {
rand.Seed(time.Now().UnixNano())
buf := make([]byte, HashLength)
for i := 0; i < HashLength; i++ {
randInt := rand.Intn(256)
buf[i] = byte(randInt)
}
hash := BytesToHash(buf[:])
return &hash
}
func (h *Hash) DeepCopy() *Hash {
hCopy := BytesToHash(h[:])
return &hCopy
}
// Keccak256 calculates and returns the Keccak256 hash of the input data.
func Keccak256(data ...[]byte) []byte {
d := sha3.NewKeccak256()
for _, b := range data {
d.Write(b)
}
return d.Sum(nil)
}
// Keccak256Hash calculates and returns the Keccak256 hash of the input data,
// converting it to an internal Hash data structure.
func Keccak256Hash(data ...[]byte) (h Hash) {
d := sha3.NewKeccak256()
for _, b := range data {
d.Write(b)
}
d.Sum(h[:0])
return h
}
// Keccak512 calculates and returns the Keccak512 hash of the input data.
func Keccak512(data ...[]byte) []byte {
d := sha3.NewKeccak512()
for _, b := range data {
d.Write(b)
}
return d.Sum(nil)
}
func CalcHash(data []byte) *Hash {
hash := Keccak256Hash(data)
return &hash
}