feat: add login

全自动水压检测仪/DATA/PasswordHelper.cs

@@ -0,0 +1,140 @@
+using System;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace 全自动水压检测仪.DATA
+{
+    /// <summary>
+    /// 密码加密辅助类
+    /// 使用 SHA256 + 盐值加密
+    /// 精确简单的实现，确保100%匹配
+    /// </summary>
+    public static class PasswordHelper
+    {
+        /// <summary>
+        /// 生成随机盐值（16字节）
+        /// </summary>
+        /// <returns>Base64编码的盐值字符串</returns>
+        public static string GenerateSalt()
+        {
+            byte[] saltBytes = new byte[16];
+            using (var rng = new RNGCryptoServiceProvider())
+            {
+                rng.GetBytes(saltBytes);
+            }
+            return Convert.ToBase64String(saltBytes);
+        }
+
+        /// <summary>
+        /// 使用 SHA256 哈希密码
+        /// 精确实现：密码 + 盐值 -> SHA256 -> Base64
+        /// </summary>
+        /// <param name="password">明文密码</param>
+        /// <param name="salt">盐值</param>
+        /// <returns>Base64编码的密码哈希值</returns>
+        public static string HashPassword(string password, string salt)
+        {
+            if (string.IsNullOrEmpty(password))
+                throw new ArgumentNullException(nameof(password));
+            
+            if (string.IsNullOrEmpty(salt))
+                throw new ArgumentNullException(nameof(salt));
+
+            // 拼接密码和盐值
+            string combined = password + salt;
+            
+            // 转换为字节数组
+            byte[] combinedBytes = Encoding.UTF8.GetBytes(combined);
+            
+            // 计算 SHA256 哈希
+            using (var sha256 = SHA256.Create())
+            {
+                byte[] hashBytes = sha256.ComputeHash(combinedBytes);
+                
+                // 转换为 Base64 字符串
+                string hash = Convert.ToBase64String(hashBytes);
+                
+                return hash;
+            }
+        }
+
+        /// <summary>
+        /// 验证密码是否匹配
+        /// 精确实现：重新计算哈希并比较
+        /// </summary>
+        /// <param name="inputPassword">输入的明文密码</param>
+        /// <param name="storedHash">存储的密码哈希值</param>
+        /// <param name="salt">盐值</param>
+        /// <returns>密码是否匹配</returns>
+        public static bool VerifyPassword(string inputPassword, string storedHash, string salt)
+        {
+            if (string.IsNullOrEmpty(inputPassword))
+                return false;
+            
+            if (string.IsNullOrEmpty(storedHash))
+                return false;
+            
+            if (string.IsNullOrEmpty(salt))
+                return false;
+
+            try
+            {
+                // 使用相同的方法计算输入密码的哈希
+                string inputHash = HashPassword(inputPassword, salt);
+                
+                // 精确比较（区分大小写）
+                bool isMatch = string.Equals(inputHash, storedHash, StringComparison.Ordinal);
+                
+                // 调试输出
+                System.Diagnostics.Debug.WriteLine($"[密码验证]");
+                System.Diagnostics.Debug.WriteLine($"  输入密码: {inputPassword}");
+                System.Diagnostics.Debug.WriteLine($"  盐值: {salt}");
+                System.Diagnostics.Debug.WriteLine($"  计算的哈希: {inputHash}");
+                System.Diagnostics.Debug.WriteLine($"  存储的哈希: {storedHash}");
+                System.Diagnostics.Debug.WriteLine($"  是否匹配: {isMatch}");
+                
+                return isMatch;
+            }
+            catch (Exception ex)
+            {
+                System.Diagnostics.Debug.WriteLine($"[密码验证异常] {ex.Message}");
+                return false;
+            }
+        }
+
+        /// <summary>
+        /// 测试密码加密功能
+        /// </summary>
+        public static void TestPasswordEncryption()
+        {
+            System.Diagnostics.Debug.WriteLine("=== 测试密码加密功能 ===");
+            
+            // 测试 1: admin123
+            string salt1 = GenerateSalt();
+            string hash1 = HashPassword("admin123", salt1);
+            bool verify1 = VerifyPassword("admin123", hash1, salt1);
+            
+            System.Diagnostics.Debug.WriteLine($"\n测试 1: admin123");
+            System.Diagnostics.Debug.WriteLine($"  盐值: {salt1}");
+            System.Diagnostics.Debug.WriteLine($"  哈希: {hash1}");
+            System.Diagnostics.Debug.WriteLine($"  验证: {verify1} (应该为 True)");
+            
+            // 测试 2: 123
+            string salt2 = GenerateSalt();
+            string hash2 = HashPassword("123", salt2);
+            bool verify2 = VerifyPassword("123", hash2, salt2);
+            
+            System.Diagnostics.Debug.WriteLine($"\n测试 2: 123");
+            System.Diagnostics.Debug.WriteLine($"  盐值: {salt2}");
+            System.Diagnostics.Debug.WriteLine($"  哈希: {hash2}");
+            System.Diagnostics.Debug.WriteLine($"  验证: {verify2} (应该为 True)");
+            
+            // 测试 3: 错误密码
+            bool verify3 = VerifyPassword("wrongpassword", hash1, salt1);
+            System.Diagnostics.Debug.WriteLine($"\n测试 3: 错误密码");
+            System.Diagnostics.Debug.WriteLine($"  验证: {verify3} (应该为 False)");
+            
+            System.Diagnostics.Debug.WriteLine("\n=== 测试完成 ===\n");
+        }
+    }
+}