85 lines
2.7 KiB
C#
85 lines
2.7 KiB
C#
namespace ASC.Core;
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public static class Crypto
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{
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private static byte[] GetSK1(bool rewrite)
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{
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return GetSK(rewrite.GetType().Name.Length);
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}
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private static byte[] GetSK2(bool rewrite)
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{
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return GetSK(rewrite.GetType().Name.Length * 2);
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}
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private static byte[] GetSK(int seed)
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{
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var random = new AscRandom(seed);
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var randomKey = new byte[32];
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for (var i = 0; i < randomKey.Length; i++)
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{
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randomKey[i] = (byte)random.Next(byte.MaxValue);
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}
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return randomKey;
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}
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public static string GetV(string data, int keyno, bool reverse)
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{
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var hasher = Aes.Create();
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hasher.Key = keyno == 1 ? GetSK1(false) : GetSK2(false);
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hasher.IV = new byte[hasher.BlockSize >> 3];
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if (reverse)
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{
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using var ms = new MemoryStream();
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using var ss = new CryptoStream(ms, hasher.CreateEncryptor(), CryptoStreamMode.Write);
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using var plainTextStream = new MemoryStream(Convert.FromBase64String(data));
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plainTextStream.CopyTo(ss);
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ss.FlushFinalBlock();
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hasher.Clear();
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return Convert.ToBase64String(ms.ToArray());
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}
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else
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{
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using var ms = new MemoryStream(Convert.FromBase64String(data));
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using var ss = new CryptoStream(ms, hasher.CreateDecryptor(), CryptoStreamMode.Read);
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using var plainTextStream = new MemoryStream();
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ss.CopyTo(plainTextStream);
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hasher.Clear();
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return Encoding.Unicode.GetString(plainTextStream.ToArray());
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}
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}
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internal static byte[] GetV(byte[] data, int keyno, bool reverse)
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{
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var hasher = Aes.Create();
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hasher.Key = keyno == 1 ? GetSK1(false) : GetSK2(false);
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hasher.IV = new byte[hasher.BlockSize >> 3];
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if (reverse)
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{
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using var ms = new MemoryStream();
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using var ss = new CryptoStream(ms, hasher.CreateEncryptor(), CryptoStreamMode.Write);
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using var plainTextStream = new MemoryStream(data);
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plainTextStream.CopyTo(ss);
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ss.FlushFinalBlock();
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hasher.Clear();
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return ms.ToArray();
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}
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else
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{
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using var ms = new MemoryStream(data);
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using var ss = new CryptoStream(ms, hasher.CreateDecryptor(), CryptoStreamMode.Read);
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using var plainTextStream = new MemoryStream();
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ss.CopyTo(plainTextStream);
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hasher.Clear();
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return plainTextStream.ToArray();
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}
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}
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}
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