103 lines
3.9 KiB
C#
103 lines
3.9 KiB
C#
using System;
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using System.IO;
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using System.Linq;
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using System.Security.Cryptography;
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using System.Text;
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using LoveLegend;
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namespace LoveLegend
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{
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public class Rescrypt
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{
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// 魔法字节标记
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private static readonly byte[] Magic = Encoding.UTF8.GetBytes("SGENCRY");
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// 解密文件：从 src 读出，解密后写到 dst
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public static void DecryptFile(string src, string dst)
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{
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var key = ConfigSystem.GetCommonConf().ResVersion;
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var data = File.ReadAllBytes(src);
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// 检查魔法字节
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if (data.Length < Magic.Length || !data.Take(Magic.Length).SequenceEqual(Magic)) throw new InvalidDataException("文件未加密或格式错误");
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// 去掉魔法字节
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var raw = data.Skip(Magic.Length).ToArray();
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// 使用 MD5.Create() 计算 MD5
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byte[] rawHash;
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using (var md5 = MD5.Create())
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{
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rawHash = md5.ComputeHash(Encoding.UTF8.GetBytes(key));
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}
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// 转成 32 字节十六进制 ASCII，与 Go 端 hex.EncodeToString 对应
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var keyBytes = Encoding.ASCII.GetBytes(BitConverter.ToString(rawHash).Replace("-", "").ToLower());
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// 解密
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var dec = KeyReverseDecryptData(raw, keyBytes);
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// 写出解密后的文件
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File.WriteAllBytes(dst, dec);
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// 删除临时源文件（加密的）
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File.Delete(src);
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}
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public static byte[] DecryptFileToBytes(string src)
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{
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var data = File.ReadAllBytes(src);
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var key = ConfigSystem.GetCommonConf().ResVersion;
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// 检查魔法字节
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if (data.Length < Magic.Length || !data.Take(Magic.Length).SequenceEqual(Magic))
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throw new InvalidDataException("文件未加密或格式错误");
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// 去掉魔法字节
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var raw = data.Skip(Magic.Length).ToArray();
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// 使用 MD5.Create() 计算 MD5
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byte[] rawHash;
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using (var md5 = MD5.Create())
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{
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rawHash = md5.ComputeHash(Encoding.UTF8.GetBytes(key));
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}
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// 转成 32 字节十六进制 ASCII，与 Go 端 hex.EncodeToString 对应
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var keyBytes = Encoding.ASCII.GetBytes(BitConverter.ToString(rawHash).Replace("-", "").ToLower());
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// 解密并返回
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return KeyReverseDecryptData(raw, keyBytes);
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}
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public static byte[] DecryptVideoToBytes(string src)
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{
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var key = ConfigSystem.GetCommonConf().ResVersion;
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var data = File.ReadAllBytes(src);
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if (data.Length < Magic.Length || !data.Take(Magic.Length).SequenceEqual(Magic))
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throw new InvalidDataException("视频未加密或格式错误");
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var raw = data.Skip(Magic.Length).ToArray();
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// 使用 MD5.Create() 计算 MD5
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byte[] rawHash;
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using (var md5 = MD5.Create())
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{
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rawHash = md5.ComputeHash(Encoding.UTF8.GetBytes(key));
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}
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// 转成 32 字节十六进制 ASCII，与 Go 端 hex.EncodeToString 对应
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var keyBytes = Encoding.ASCII.GetBytes(BitConverter.ToString(rawHash).Replace("-", "").ToLower());
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return KeyReverseDecryptData(raw, keyBytes);
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}
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// 基础解密：XOR + 反序
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private static byte[] KeyReverseDecryptData(byte[] data, byte[] key)
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{
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var keyLen = key.Length;
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// XOR
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for (var i = 0; i < data.Length; i++)
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data[i] ^= key[i % keyLen];
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// 反序
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for (int i = 0, j = data.Length - 1; i < j; i++, j--)
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(data[i], data[j]) = (data[j], data[i]);
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return data;
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}
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}
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} |