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Delete AesUtils.cs

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2dust 2024-11-26 19:52:22 +08:00
parent 504f8d09a6
commit ac1a357740
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v2rayN/ServiceLib/Common/AesUtils.cs
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using System;
using System.IO;
using System.Security.Cryptography;
using System.Text;
namespace ServiceLib.Common
{
public class AesUtils
{
private const int KeySize = 256; // AES-256
private const int IvSize = 16; // AES block size
private const int Iterations = 10000;
private static readonly byte[] Salt = Encoding.ASCII.GetBytes("saltysalt".PadRight(16, ' '));//google浏览器默认盐值
/// <summary>
/// Encrypt
/// </summary>
/// <param name="text">Plain text</param>
/// <param name="password">Password for key derivation</param>
/// <returns>Base64 encoded cipher text with IV</returns>
public static string Encrypt(string text, string password)
{
if (string.IsNullOrEmpty(text))
return string.Empty;
if (string.IsNullOrEmpty(password))
throw new ArgumentNullException("Password cannot be null.");
byte[] plaintext = Encoding.UTF8.GetBytes(text);
byte[] key = GetDefaultKey(password);
byte[] iv = GenerateIv();
using (Aes aes = Aes.Create())
{
aes.Key = key;
aes.IV = iv;
using (MemoryStream ms = new MemoryStream())
{
ms.Write(iv, 0, iv.Length);
using (CryptoStream cs = new CryptoStream(ms, aes.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(plaintext, 0, plaintext.Length);
cs.FlushFinalBlock();
}
byte[] cipherTextWithIv = ms.ToArray();
return Convert.ToBase64String(cipherTextWithIv);
}
}
}
/// <summary>
/// Decrypt
/// </summary>
/// <param name="cipherTextWithIv">Base64 encoded cipher text with IV</param>
/// <param name="password">Password for key derivation</param>
/// <returns>Plain text</returns>
public static string Decrypt(string cipherTextWithIv, string password)
{
if (string.IsNullOrEmpty(cipherTextWithIv))
return string.Empty;
if (string.IsNullOrEmpty(password))
throw new ArgumentNullException("Password cannot be null.");
byte[] cipherTextWithIvBytes = Convert.FromBase64String(cipherTextWithIv);
byte[] key = GetDefaultKey(password);
byte[] iv = new byte[IvSize];
Buffer.BlockCopy(cipherTextWithIvBytes, 0, iv, 0, IvSize);
byte[] cipherText = new byte[cipherTextWithIvBytes.Length - IvSize];
Buffer.BlockCopy(cipherTextWithIvBytes, IvSize, cipherText, 0, cipherText.Length - IvSize);
using (Aes aes = Aes.Create())
{
aes.Key = key;
aes.IV = iv;
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, aes.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(cipherText, 0, cipherText.Length);
cs.FlushFinalBlock();
}
byte[] plainText = ms.ToArray();
return Encoding.UTF8.GetString(plainText);
}
}
}
private static byte[] GetDefaultKey(string password)
{
using (Rfc2898DeriveBytes pbkdf2 = new Rfc2898DeriveBytes(password, Salt, Iterations, HashAlgorithmName.SHA256))
{
return pbkdf2.GetBytes(KeySize / 8);
}
}
private static byte[] GenerateIv()
{
using (RNGCryptoServiceProvider rng = new RNGCryptoServiceProvider())
{
byte[] iv = new byte[IvSize];
rng.GetBytes(iv);
return iv;
}
}
}
}