add openssh private key method

asy.go

@@ -3,12 +3,14 @@ package starcrypto
 import (
 	"crypto"
 	"crypto/ecdsa"
+	"crypto/ed25519"
 	"crypto/rand"
 	"crypto/rsa"
 	"crypto/x509"
 	"encoding/pem"
 	"errors"
 	"golang.org/x/crypto/ssh"
+	"reflect"
 )
 
 func EncodePrivateKey(private crypto.PrivateKey, secret string) ([]byte, error) {
@@ -87,11 +89,41 @@ func DecodePrivateKey(private []byte, password string) (crypto.PrivateKey, error
 			return nil, err
 		}
 		return prikey, err
+	case "OPENSSH PRIVATE KEY":
+		var err error
+		var priv crypto.PrivateKey
+		if password == "" {
+			priv, err = ssh.ParseRawPrivateKey(private)
+			if err != nil {
+				return nil, err
+			}
+		} else {
+			priv, err = ssh.ParseRawPrivateKeyWithPassphrase(private, []byte(password))
+			if err != nil {
+				return nil, err
+			}
+		}
+		return priv, nil
 	default:
 		return nil, errors.New("private key type error")
 	}
 }
 
+func EncodeOpenSSHPrivateKey(private crypto.PrivateKey, secret string) ([]byte, error) {
+	var key interface{} = private
+	var block *pem.Block
+	var err error
+	if reflect.TypeOf(key) == reflect.TypeOf(&ed25519.PrivateKey{}) {
+		key = *(key.(*ed25519.PrivateKey))
+	}
+	if secret == "" {
+		block, err = ssh.MarshalPrivateKey(key, "")
+	} else {
+		block, err = ssh.MarshalPrivateKeyWithPassphrase(key, "", []byte(secret))
+	}
+	return pem.EncodeToMemory(block), err
+}
+
 func DecodePublicKey(pubStr []byte) (crypto.PublicKey, error) {
 	blk, _ := pem.Decode(pubStr)
 	if blk == nil {