/
sha256.go
152 lines (127 loc) · 2.9 KB
/
sha256.go
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package crypto
import (
"crypto/sha256"
"encoding/binary"
"encoding/hex"
"encoding/json"
"github.com/eosspark/eos-go/crypto/rlp"
. "github.com/eosspark/eos-go/exception/try"
"hash"
)
type Sha256 struct {
Hash [4]uint64 `eos:"array"`
}
func NewSha256() hash.Hash {
return sha256.New()
}
func NewSha256Nil() Sha256 {
data := [4]uint64{0, 0, 0, 0}
return Sha256{
Hash: data,
}
}
func NewSha256String(s string) *Sha256 {
bytes, err := hex.DecodeString(s)
Throw(err)
result := new(Sha256)
for i := range result.Hash {
result.Hash[i] = binary.LittleEndian.Uint64(bytes[i*8 : (i+1)*8])
}
return result
}
func NewSha256Byte(s []byte) *Sha256 {
result := new(Sha256)
//if len(s) <32{
// return nil,errors.New("the length of slice is less then 32")
//}
for i := range result.Hash {
result.Hash[i] = binary.LittleEndian.Uint64(s[i*8 : (i+1)*8])
}
return result
}
func Hash256(t interface{}) *Sha256 {
cereal, err := rlp.EncodeToBytes(t)
Throw(err)
h := sha256.New()
_, _ = h.Write(cereal)
hashed := h.Sum(nil)
result := &Sha256{}
for i := range result.Hash {
result.Hash[i] = binary.LittleEndian.Uint64(hashed[i*8 : (i+1)*8])
}
return result
}
func Hash256String(t string) *Sha256 {
cereal := []byte(t)
h := sha256.New()
_, _ = h.Write(cereal)
hashed := h.Sum(nil)
result := &Sha256{}
for i := range result.Hash {
result.Hash[i] = binary.LittleEndian.Uint64(hashed[i*8 : (i+1)*8])
}
return result
}
func (h Sha256) MarshalJSON() ([]byte, error) {
return json.Marshal(hex.EncodeToString(h.Bytes()))
}
func (h *Sha256) UnmarshalJSON(data []byte) error {
var s string
err := json.Unmarshal(data, &s)
if err != nil {
return err
}
b, err := hex.DecodeString(s)
if err != nil {
return err
}
for i := range h.Hash {
h.Hash[i] = binary.LittleEndian.Uint64(b[i*8 : (i+1)*8])
}
return nil
}
func (h Sha256) String() string {
return hex.EncodeToString(h.Bytes())
}
func (h Sha256) Bytes() []byte {
result := make([]byte, 32)
for i := range h.Hash {
binary.LittleEndian.PutUint64(result[i*8:(i+1)*8], h.Hash[i])
}
return result
}
func (h Sha256) BigEndianBytes() []byte {
result := make([]byte, 32)
for i := range h.Hash {
binary.BigEndian.PutUint64(result[i*8:(i+1)*8], h.Hash[i])
}
return result
}
func (h Sha256) Or(h1 Sha256) Sha256 {
result := Sha256{}
for i := range result.Hash {
result.Hash[i] = h.Hash[i] ^ h1.Hash[i]
}
return result
}
func (h Sha256) Equals(h1 Sha256) bool {
// idea to not use memcmp, from:
// https://lemire.me/blog/2018/08/22/avoid-lexicographical-comparisons-when-testing-for-string-equality/
return h.Hash[0] == h1.Hash[0] &&
h.Hash[1] == h1.Hash[1] &&
h.Hash[2] == h1.Hash[2] &&
h.Hash[3] == h1.Hash[3]
}
func Sha256Compare(a, b Sha256) int {
for i := 0; i < 4; i++ {
if a.Hash[i] > b.Hash[i] {
return 1
} else if a.Hash[i] < b.Hash[i] {
return -1
}
}
return 0
}
func (h Sha256) IsEmpty() bool {
return len(h.Hash) == 0
}