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use Binary.Rotate methods.

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This commit is contained in:
morkt
2016-08-18 14:57:44 +04:00
parent 4a2f867353
commit 79f8548d3e
1 changed files with 6 additions and 7 deletions
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13
ArcFormats/ShiinaRio/WarcEncryption.cs
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@@ -139,7 +139,7 @@ namespace GameRes.Formats.ShiinaRio
d ^= (byte)((double)NextRand() / 16777216.0); d ^= (byte)((double)NextRand() / 16777216.0);
else else
d ^= (byte)((double)NextRand() / 4294967296.0); // ? effectively a no-op d ^= (byte)((double)NextRand() / 4294967296.0); // ? effectively a no-op
d = (byte)(((d & 1) << 7) | (d >> 1)); d = Binary.RotByteR (d, 1);
d ^= (byte)(m_scheme.CryptKey[n++] ^ m_scheme.CryptKey[x]); d ^= (byte)(m_scheme.CryptKey[n++] ^ m_scheme.CryptKey[x]);
data[index+i] = d; data[index+i] = d;
x = d % (uint)m_scheme.CryptKey.Length; x = d % (uint)m_scheme.CryptKey.Length;
@@ -367,8 +367,7 @@ namespace GameRes.Formats.ShiinaRio
v ^= buf[i-14]; v ^= buf[i-14];
v ^= buf[i-8]; v ^= buf[i-8];
v ^= buf[i-3]; v ^= buf[i-3];
v = v << 1 | v >> 31; buf[i] = Binary.RotL (v, 1);
buf[i] = v;
} }
uint[] key = new uint[10]; uint[] key = new uint[10];
Array.Copy (key_src, key, 5); Array.Copy (key_src, key, 5);
@@ -418,13 +417,13 @@ namespace GameRes.Formats.ShiinaRio
v26 = k1 ^ k2 ^ k3; v26 = k1 ^ k2 ^ k3;
pc = 0; pc = 0;
} }
uint v28 = buf[buf_idx] + k4 + v26 + pc + (k0 << 5 | k0 >> 27); uint new_k0 = buf[buf_idx] + k4 + v26 + pc + Binary.RotL (k0, 5);
uint v29 = (k1 >> 2) | (k1 << 30); uint new_k2 = Binary.RotR (k1, 2);
k1 = k0; k1 = k0;
k4 = k3; k4 = k3;
k3 = k2; k3 = k2;
k2 = v29; k2 = new_k2;
k0 = v28; k0 = new_k0;
++buf_idx; ++buf_idx;
} }
key[0] += k0; key[0] += k0;