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RC4 refinements

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This commit is contained in:
BtbN 2019-04-13 17:26:07 +02:00
parent 18a12f86ca
commit ff407d4fd6
1 changed files with 12 additions and 13 deletions
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25
eAmuseCore/Crypto/RC4.cs
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@ -8,16 +8,15 @@ namespace eAmuseCore.Crypto
public static class RC4
{
private static readonly byte[] konamiCode =
new byte[]{ 105, 215, 70, 39, 217, 133, 238, 33, 135,
22, 21, 112, 208, 141, 147, 177, 36, 85,
3, 91, 109, 240, 216, 32, 93, 245 };
new byte[]{ 0x69, 0xd7, 0x46, 0x27, 0xd9, 0x85, 0xee, 0x21, 0x87, 0x16, 0x15, 0x70, 0xd0,
0x8d, 0x93, 0xb1, 0x24, 0x55, 0x03, 0x5b, 0x6d, 0xf0, 0xd8, 0x20, 0x5d, 0xf5 };
public static IEnumerable<byte> ApplyEAmuseInfo(string info, IEnumerable<byte> data)
{
if (!info.StartsWith("1-") || info.Count(c => c == '-') != 3 || info.Length != 15)
throw new ArgumentException("Unknown E-Amuse-Info format.", "info");
info = info.Substring(2).Replace("-", "");
byte[] key = Enumerable.Range(0, info.Length / 2).Select(i => Convert.ToByte(info.Substring(i * 2, 2))).ToArray();
byte[] key = Enumerable.Range(0, info.Length / 2).Select(i => Convert.ToByte(info.Substring(i * 2, 2), 16)).ToArray();
return ApplyEAmuse(key, data);
}
@ -29,7 +28,7 @@ namespace eAmuseCore.Crypto
using (MD5 md5 = MD5.Create())
{
byte[] realKey = md5.ComputeHash(key.Concat(konamiCode).ToArray());
return Apply(realKey, data);
return EncryptOutput(realKey, data);
}
}
@ -40,11 +39,11 @@ namespace eAmuseCore.Crypto
private static byte[] EncryptInitalize(byte[] key)
{
byte[] s = Enumerable.Range(0, 256).Select(i => (byte)i).ToArray();
byte[] s = Enumerable.Range(0, 0x100).Select(i => (byte)i).ToArray();
for (uint i = 0, j = 0; i < 256; i++)
for (uint i = 0, j = 0; i < 0x100; i++)
{
j = (j + key[i % key.Length] + s[i]) & 255;
j = (j + key[i % key.Length] + s[i]) & 0xff;
Swap(s, i, j);
}
@ -58,15 +57,15 @@ namespace eAmuseCore.Crypto
uint i = 0;
uint j = 0;
return data.Select(b =>
foreach (byte b in data)
{
i = (i + 1) & 255;
j = (j + s[i]) & 255;
i = (i + 1) & 0xff;
j = (j + s[i]) & 0xff;
Swap(s, i, j);
return (byte)(b ^ s[(s[i] + s[j]) & 255]);
});
yield return (byte)(b ^ s[(s[i] + s[j]) & 0xff]);
};
}
private static void Swap(byte[] s, uint i, uint j)