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signature.go
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signature.go
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package signature
import (
"bytes"
"crypto/sha256"
"fmt"
"io"
"github.com/nknorg/nkn/v2/common"
"github.com/nknorg/nkn/v2/crypto"
"github.com/nknorg/nkn/v2/pb"
)
//SignableData describe the data need be signed.
type SignableData interface {
GetProgramHashes() ([]common.Uint160, error)
SetPrograms([]*pb.Program)
GetPrograms() []*pb.Program
SerializeUnsigned(io.Writer) error
}
func SignBySigner(data SignableData, signer Signer) ([]byte, error) {
rtx, err := Sign(data, signer.PrivKey())
if err != nil {
return nil, fmt.Errorf("[Signature],SignBySigner failed:%v", err)
}
return rtx, nil
}
func GetHashData(data SignableData) []byte {
buf := new(bytes.Buffer)
data.SerializeUnsigned(buf)
return buf.Bytes()
}
func GetHashForSigning(data SignableData) []byte {
temp := sha256.Sum256(GetHashData(data))
return temp[:]
}
func Sign(data SignableData, prikey []byte) ([]byte, error) {
signature, err := crypto.Sign(prikey, GetHashForSigning(data))
if err != nil {
return nil, fmt.Errorf("[Signature],Sign failed:%v", err)
}
return signature, nil
}