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134 lines
3.5 KiB
C++
Executable File
134 lines
3.5 KiB
C++
Executable File
// Crypto/Rar20Crypto.cpp
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#include "StdAfx.h"
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#include "../../../C/7zCrc.h"
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#include "../../../C/CpuArch.h"
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#include "../../../C/RotateDefs.h"
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#include "Rar20Crypto.h"
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namespace NCrypto {
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namespace NRar20 {
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static const int kNumRounds = 32;
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static const Byte InitSubstTable[256] = {
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215, 19,149, 35, 73,197,192,205,249, 28, 16,119, 48,221, 2, 42,
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232, 1,177,233, 14, 88,219, 25,223,195,244, 90, 87,239,153,137,
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255,199,147, 70, 92, 66,246, 13,216, 40, 62, 29,217,230, 86, 6,
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71, 24,171,196,101,113,218,123, 93, 91,163,178,202, 67, 44,235,
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107,250, 75,234, 49,167,125,211, 83,114,157,144, 32,193,143, 36,
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158,124,247,187, 89,214,141, 47,121,228, 61,130,213,194,174,251,
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97,110, 54,229,115, 57,152, 94,105,243,212, 55,209,245, 63, 11,
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164,200, 31,156, 81,176,227, 21, 76, 99,139,188,127, 17,248, 51,
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207,120,189,210, 8,226, 41, 72,183,203,135,165,166, 60, 98, 7,
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122, 38,155,170, 69,172,252,238, 39,134, 59,128,236, 27,240, 80,
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131, 3, 85,206,145, 79,154,142,159,220,201,133, 74, 64, 20,129,
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224,185,138,103,173,182, 43, 34,254, 82,198,151,231,180, 58, 10,
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118, 26,102, 12, 50,132, 22,191,136,111,162,179, 45, 4,148,108,
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161, 56, 78,126,242,222, 15,175,146, 23, 33,241,181,190, 77,225,
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0, 46,169,186, 68, 95,237, 65, 53,208,253,168, 9, 18,100, 52,
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116,184,160, 96,109, 37, 30,106,140,104,150, 5,204,117,112, 84
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};
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void CData::UpdateKeys(const Byte *data)
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{
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for (int i = 0; i < 16; i += 4)
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for (int j = 0; j < 4; j++)
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Keys[j] ^= g_CrcTable[data[i + j]];
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}
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static void Swap(Byte *b1, Byte *b2)
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{
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Byte b = *b1;
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*b1 = *b2;
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*b2 = b;
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}
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void CData::SetPassword(const Byte *password, UInt32 passwordLen)
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{
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Keys[0] = 0xD3A3B879L;
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Keys[1] = 0x3F6D12F7L;
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Keys[2] = 0x7515A235L;
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Keys[3] = 0xA4E7F123L;
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Byte psw[256];
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memset(psw, 0, sizeof(psw));
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memcpy(psw, password, passwordLen);
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memcpy(SubstTable, InitSubstTable, sizeof(SubstTable));
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for (UInt32 j = 0; j < 256; j++)
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for (UInt32 i = 0; i < passwordLen; i += 2)
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{
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UInt32 n2 = (Byte)g_CrcTable[(psw[i + 1] + j) & 0xFF];
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UInt32 n1 = (Byte)g_CrcTable[(psw[i] - j) & 0xFF];
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for (UInt32 k = 1; (n1 & 0xFF) != n2; n1++, k++)
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Swap(&SubstTable[n1 & 0xFF], &SubstTable[(n1 + i + k) & 0xFF]);
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}
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for (UInt32 i = 0; i < passwordLen; i+= 16)
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EncryptBlock(&psw[i]);
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}
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void CData::CryptBlock(Byte *buf, bool encrypt)
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{
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Byte inBuf[16];
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UInt32 A, B, C, D, T, TA, TB;
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A = GetUi32(buf + 0) ^ Keys[0];
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B = GetUi32(buf + 4) ^ Keys[1];
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C = GetUi32(buf + 8) ^ Keys[2];
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D = GetUi32(buf + 12) ^ Keys[3];
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if (!encrypt)
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memcpy(inBuf, buf, sizeof(inBuf));
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for (int i = 0; i < kNumRounds; i++)
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{
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UInt32 key = Keys[(encrypt ? i : (kNumRounds - 1 - i)) & 3];
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T = ((C + rotlFixed(D, 11)) ^ key);
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TA = A ^ SubstLong(T);
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T = ((D ^ rotlFixed(C, 17)) + key);
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TB = B ^ SubstLong(T);
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A = C;
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B = D;
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C = TA;
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D = TB;
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}
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SetUi32(buf + 0, C ^ Keys[0]);
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SetUi32(buf + 4, D ^ Keys[1]);
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SetUi32(buf + 8, A ^ Keys[2]);
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SetUi32(buf + 12, B ^ Keys[3]);
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UpdateKeys(encrypt ? buf : inBuf);
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}
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STDMETHODIMP CDecoder::CryptoSetPassword(const Byte *data, UInt32 size)
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{
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_cipher.SetPassword(data, size);
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return S_OK;
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}
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STDMETHODIMP CDecoder::Init()
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{
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return S_OK;
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}
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static const UInt32 kBlockSize = 16;
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STDMETHODIMP_(UInt32) CDecoder::Filter(Byte *data, UInt32 size)
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{
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if (size == 0)
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return 0;
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if (size < kBlockSize)
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return kBlockSize;
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UInt32 i;
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size -= kBlockSize;
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for (i = 0; i <= size; i += kBlockSize)
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_cipher.DecryptBlock(data + i);
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return i;
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}
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}}
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