[研究][ASP.NET][C#]PBKDF2計算密碼雜湊試用
2022-04-16
PBKDF2簡單而言就是將salted hash進行多次重複計算
PBKDF2 是 Password-Based Key Derivation Function 的縮寫，即「基於密碼的密鑰推導函數」。
Pbkdf2Class.cs
using System;
using System.Security.Cryptography;
namespace WebApplication2
{
public class Pbkdf2Class
{
private const int SaltByteSize = 32;
private const int HashByteSize = 32;
private const int Iterations = 4096;
private static string GetSalt()
{
var cryptoProvider = new RNGCryptoServiceProvider();
byte[] b_salt = new byte[SaltByteSize];
cryptoProvider.GetBytes(b_salt);
return Convert.ToBase64String(b_salt);
}
public static string GetPasswordHash(string password)
{
string salt = GetSalt();
byte[] saltBytes = Convert.FromBase64String(salt);
byte[] derived;
using (var pbkdf2 = new Rfc2898DeriveBytes(
password,
saltBytes,
Iterations,
HashAlgorithmName.SHA512))
{
derived = pbkdf2.GetBytes(HashByteSize);
}
return string.Format("{0}:{1}:{2}", Iterations,
Convert.ToBase64String(derived), Convert.ToBase64String(saltBytes));
}
public static string GetPasswordHash(string password,
HashAlgorithmName hashAlgorithmName)
{
string salt = GetSalt();
byte[] saltBytes = Convert.FromBase64String(salt);
byte[] derived;
using (var pbkdf2 = new Rfc2898DeriveBytes(
password,
saltBytes,
Iterations,
hashAlgorithmName))
//HashAlgorithmName.SHA512))
{
derived = pbkdf2.GetBytes(HashByteSize);
}
return string.Format("{0}:{1}:{2}", Iterations,
Convert.ToBase64String(derived), Convert.ToBase64String(saltBytes));
}
public static bool VerifyPasswordHash(string password, string hash)
{
try
{
string[] parts = hash.Split(new char[] { ':' });
byte[] saltBytes = Convert.FromBase64String(parts[2]);
byte[] derived;
int iterations = Convert.ToInt32(parts[0]);
using (var pbkdf2 = new Rfc2898DeriveBytes(
password,
saltBytes,
iterations,
HashAlgorithmName.SHA512))
{
derived = pbkdf2.GetBytes(HashByteSize);
}
string new_hash = string.Format("{0}:{1}:{2}", Iterations,
Convert.ToBase64String(derived), Convert.ToBase64String(saltBytes));
return hash == new_hash;
}
catch
{
return false;
}
}
public static bool VerifyPasswordHash(string password, string hash,
HashAlgorithmName hashAlgorithmName)
{
try
{
string[] parts = hash.Split(new char[] { ':' });
byte[] saltBytes = Convert.FromBase64String(parts[2]);
byte[] derived;
int iterations = Convert.ToInt32(parts[0]);
using (var pbkdf2 = new Rfc2898DeriveBytes(
password,
saltBytes,
iterations,
hashAlgorithmName))
//HashAlgorithmName.SHA512))
{
derived = pbkdf2.GetBytes(HashByteSize);
}
string new_hash = string.Format("{0}:{1}:{2}", Iterations,
Convert.ToBase64String(derived), Convert.ToBase64String(saltBytes));
return hash == new_hash;
}
catch
{
return false;
}
}
}
}
|
Default.aspx
<%@ Page Language="C#" AutoEventWireup="true"
CodeBehind="Default.aspx.cs" Inherits="WebApplication2.Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox><br />
<asp:Button ID="Button1" runat="server" Text="Button"
OnClick="Button1_Click" /><br />
<asp:Label ID="Label1" runat="server"></asp:Label><br />
<asp:Label ID="Label2" runat="server"></asp:Label><br />
</div>
</form>
</body>
</html>
|
Default.aspx.cs
using System;
using System.Security.Cryptography;
namespace WebApplication2
{
public partial class Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void Button1_Click(object sender, EventArgs e)
{
//Label1.Text= Pbkdf2Class.GetPasswordHash(TextBox1.Text);
Label1.Text = Pbkdf2Class.GetPasswordHash(TextBox1.Text,
HashAlgorithmName.SHA512);
Label2.Text = Label1.Text.Length.ToString();
}
}
}
|
結果
(完)
相關
KeyDerivation.Pbkdf2(String, Byte[], KeyDerivationPrf, Int32, Int32) 方法 (Microsoft.AspNetCore.Cryptography.KeyDerivation) | Microsoft Docs
https://docs.microsoft.com/zh-tw/dotnet/api/microsoft.aspnetcore.cryptography.keyderivation.keyderivation.pbkdf2?view=aspnetcore-6.0
C#學習網誌: Password hash using PBKDF2 with HMAC SHA256/ SHA512 in .NET Framework 4.7.2 and .NET Core 2.0
http://vegeee-csharp.blogspot.com/2019/05/password-hash-using-pbkdf2-with-hmac.html?m=1
如何安全的加密使用者的密碼 使用 PBKDF2 - HackMD
https://hackmd.io/@Not/Pbkdf2
Information on RFC 2898 » RFC Editor
https://www.rfc-editor.org/info/rfc2898
Rfc2898DeriveBytes 類別 (System.Security.Cryptography) | Microsoft Docs
https://docs.microsoft.com/zh-tw/dotnet/api/system.security.cryptography.rfc2898derivebytes?view=net-6.0
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