first commit

backend/F9WebAiTest.Infrastructure/InterfaceImplements/Security/PasswordHasher.cs

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+using System.Security.Cryptography;
+using System.Text;
+using F9WebAiTest.Application.Interfaces.Security;
+
+namespace F9WebAiTest.Infrastructure.InterfaceImplements.Security;
+
+/// <summary>密码哈希服务实现（BCrypt）</summary>
+public class PasswordHasher : IPasswordHasher
+{
+    public string Hash256(string input)
+    {
+        var bytes = SHA256.HashData(Encoding.UTF8.GetBytes(input ?? ""));
+        return Convert.ToHexString(bytes).ToLowerInvariant();
+    }
+
+    public string GetMd5Hash(string input)
+    {
+        var bytes = MD5.HashData(Encoding.UTF8.GetBytes(input ?? ""));
+        return Convert.ToHexString(bytes).ToLowerInvariant();
+    }
+
+    public string HashPassword(string password)
+        => BCrypt.Net.BCrypt.HashPassword(password);
+
+    public bool VerifyPassword(string password, string hashedPassword)
+        => BCrypt.Net.BCrypt.Verify(password, hashedPassword);
+}