Add Md5UserSaltCredManager.

cred/manager.go

@@ -23,6 +23,8 @@ func GetCredManager(passwordType string) CredManager {
 		return NewPlainCredManager()
 	} else if passwordType == "salt" {
 		return NewSha256SaltCredManager()
+	} else if passwordType == "md5-salt" {
+		return NewMd5UserSaltCredManager()
 	}
 
 	return nil

cred/md5-user-salt.go

@@ -0,0 +1,44 @@
+// Copyright 2021 The casbin Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package cred
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+)
+
+type Md5UserSaltCredManager struct{}
+
+func getMd5(data []byte) []byte {
+	hash := md5.Sum(data)
+	return hash[:]
+}
+
+func getMd5HexDigest(s string) string {
+	b := getMd5([]byte(s))
+	res := hex.EncodeToString(b)
+	return res
+}
+
+func NewMd5UserSaltCredManager() *Sha256SaltCredManager {
+	cm := &Sha256SaltCredManager{}
+	return cm
+}
+
+func (cm *Md5UserSaltCredManager) GetSealedPassword(password string, userSalt string, organizationSalt string) string {
+	hash := getMd5HexDigest(password)
+	res := getMd5HexDigest(hash + userSalt)
+	return res
+}

web/src/OrganizationEditPage.js

@@ -152,7 +152,7 @@ class OrganizationEditPage extends React.Component {
           <Col span={22} >
             <Select virtual={false} style={{width: '100%'}} value={this.state.organization.passwordType} onChange={(value => {this.updateOrganizationField('passwordType', value);})}>
               {
-                ['plain', 'salt']
+                ['plain', 'salt', 'md5-salt']
                   .map((item, index) => <Option key={index} value={item}>{item}</Option>)
               }
             </Select>