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Add CRC32 instance methods

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de4dot 2013-11-23 21:59:45 +01:00
parent f173df9b09
commit cc56b730b3
1 changed files with 126 additions and 1 deletions
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127
de4dot.code/deobfuscators/CRC32.cs
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@ -18,7 +18,7 @@
*/
namespace de4dot.code.deobfuscators {
class CRC32 {
struct CRC32 {
static readonly uint[] table = new uint[256] {
0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA,
0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3,
@ -86,6 +86,131 @@ namespace de4dot.code.deobfuscators {
0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D,
};
uint checkSum;
public void Initialize() {
this.checkSum = uint.MaxValue;
}
public void Hash(byte[] data) {
if (data == null)
return;
foreach (var b in data) {
int i = (byte)(checkSum ^ b);
checkSum = (checkSum >> 8) ^ table[i];
}
}
public void Hash(sbyte a) {
int i = (byte)(checkSum ^ a);
checkSum = (checkSum >> 8) ^ table[i];
}
public void Hash(byte a) {
int i = (byte)(checkSum ^ a);
checkSum = (checkSum >> 8) ^ table[i];
}
public void Hash(short a) {
int i = (byte)(checkSum ^ (byte)a);
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 8));
checkSum = (checkSum >> 8) ^ table[i];
}
public void Hash(ushort a) {
int i = (byte)(checkSum ^ (byte)a);
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 8));
checkSum = (checkSum >> 8) ^ table[i];
}
public void Hash(int a) {
int i = (byte)(checkSum ^ (byte)a);
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 8));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 16));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 24));
checkSum = (checkSum >> 8) ^ table[i];
}
public void Hash(uint a) {
int i = (byte)(checkSum ^ (byte)a);
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 8));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 16));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 24));
checkSum = (checkSum >> 8) ^ table[i];
}
public void Hash(long a) {
int i = (byte)(checkSum ^ (byte)a);
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 8));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 16));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 24));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 32));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 40));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 48));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 56));
checkSum = (checkSum >> 8) ^ table[i];
}
public void Hash(ulong a) {
int i = (byte)(checkSum ^ (byte)a);
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 8));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 16));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 24));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 32));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 40));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 48));
checkSum = (checkSum >> 8) ^ table[i];
i = (byte)(checkSum ^ (byte)(a >> 56));
checkSum = (checkSum >> 8) ^ table[i];
}
public uint GetHash() {
return ~checkSum;
}
public static uint CheckSum(byte[] data) {
if (data == null)
return 0;