1 files changed, 133 insertions, 0 deletions
diff --git a/src/libs/7zip/win/CPP/7zip/Crypto/Rar20Crypto.cpp b/src/libs/7zip/win/CPP/7zip/Crypto/Rar20Crypto.cpp
new file mode 100644
index 000000000..c2df0e527
--- /dev/null
+++ b/src/libs/7zip/win/CPP/7zip/Crypto/Rar20Crypto.cpp
@@ -0,0 +1,133 @@
+// Crypto/Rar20Crypto.cpp
+
+#include "StdAfx.h"
+
+#include "../../../C/7zCrc.h"
+#include "../../../C/CpuArch.h"
+#include "../../../C/RotateDefs.h"
+
+#include "Rar20Crypto.h"
+
+namespace NCrypto {
+namespace NRar20 {
+
+static const int kNumRounds = 32;
+
+static const Byte InitSubstTable[256] = {
+  215, 19,149, 35, 73,197,192,205,249, 28, 16,119, 48,221,  2, 42,
+  232,  1,177,233, 14, 88,219, 25,223,195,244, 90, 87,239,153,137,
+  255,199,147, 70, 92, 66,246, 13,216, 40, 62, 29,217,230, 86,  6,
+   71, 24,171,196,101,113,218,123, 93, 91,163,178,202, 67, 44,235,
+  107,250, 75,234, 49,167,125,211, 83,114,157,144, 32,193,143, 36,
+  158,124,247,187, 89,214,141, 47,121,228, 61,130,213,194,174,251,
+   97,110, 54,229,115, 57,152, 94,105,243,212, 55,209,245, 63, 11,
+  164,200, 31,156, 81,176,227, 21, 76, 99,139,188,127, 17,248, 51,
+  207,120,189,210,  8,226, 41, 72,183,203,135,165,166, 60, 98,  7,
+  122, 38,155,170, 69,172,252,238, 39,134, 59,128,236, 27,240, 80,
+  131,  3, 85,206,145, 79,154,142,159,220,201,133, 74, 64, 20,129,
+  224,185,138,103,173,182, 43, 34,254, 82,198,151,231,180, 58, 10,
+  118, 26,102, 12, 50,132, 22,191,136,111,162,179, 45,  4,148,108,
+  161, 56, 78,126,242,222, 15,175,146, 23, 33,241,181,190, 77,225,
+    0, 46,169,186, 68, 95,237, 65, 53,208,253,168,  9, 18,100, 52,
+  116,184,160, 96,109, 37, 30,106,140,104,150,  5,204,117,112, 84
+};
+
+void CData::UpdateKeys(const Byte *data)
+{
+  for (int i = 0; i < 16; i += 4)
+    for (int j = 0; j < 4; j++)
+      Keys[j] ^= g_CrcTable[data[i + j]];
+}
+
+static void Swap(Byte *b1, Byte *b2)
+{
+  Byte b = *b1;
+  *b1 = *b2;
+  *b2 = b;
+}
+
+void CData::SetPassword(const Byte *password, UInt32 passwordLen)
+{
+  Keys[0] = 0xD3A3B879L;
+  Keys[1] = 0x3F6D12F7L;
+  Keys[2] = 0x7515A235L;
+  Keys[3] = 0xA4E7F123L;
+  
+  Byte psw[256];
+  memset(psw, 0, sizeof(psw));
+  memcpy(psw, password, passwordLen);
+  memcpy(SubstTable, InitSubstTable, sizeof(SubstTable));
+
+  for (UInt32 j = 0; j < 256; j++)
+    for (UInt32 i = 0; i < passwordLen; i += 2)
+    {
+      UInt32 n2 = (Byte)g_CrcTable[(psw[i + 1] + j) & 0xFF];
+      UInt32 n1 = (Byte)g_CrcTable[(psw[i] - j) & 0xFF];
+      for (UInt32 k = 1; (n1 & 0xFF) != n2; n1++, k++)
+        Swap(&SubstTable[n1 & 0xFF], &SubstTable[(n1 + i + k) & 0xFF]);
+    }
+  for (UInt32 i = 0; i < passwordLen; i+= 16)
+    EncryptBlock(&psw[i]);
+}
+
+void CData::CryptBlock(Byte *buf, bool encrypt)
+{
+  Byte inBuf[16];
+  UInt32 A, B, C, D, T, TA, TB;
+
+  A = GetUi32(buf +  0) ^ Keys[0];
+  B = GetUi32(buf +  4) ^ Keys[1];
+  C = GetUi32(buf +  8) ^ Keys[2];
+  D = GetUi32(buf + 12) ^ Keys[3];
+
+  if (!encrypt)
+    memcpy(inBuf, buf, sizeof(inBuf));
+  
+  for (int i = 0; i < kNumRounds; i++)
+  {
+    UInt32 key = Keys[(encrypt ? i : (kNumRounds - 1 - i)) & 3];
+    T = ((C + rotlFixed(D, 11)) ^ key);
+    TA = A ^ SubstLong(T);
+    T = ((D ^ rotlFixed(C, 17)) + key);
+    TB = B ^ SubstLong(T);
+    A = C;
+    B = D;
+    C = TA;
+    D = TB;
+  }
+
+  SetUi32(buf +  0, C ^ Keys[0]);
+  SetUi32(buf +  4, D ^ Keys[1]);
+  SetUi32(buf +  8, A ^ Keys[2]);
+  SetUi32(buf + 12, B ^ Keys[3]);
+
+  UpdateKeys(encrypt ? buf : inBuf);
+}
+
+STDMETHODIMP CDecoder::CryptoSetPassword(const Byte *data, UInt32 size)
+{
+  _cipher.SetPassword(data, size);
+  return S_OK;
+}
+
+STDMETHODIMP CDecoder::Init()
+{
+  return S_OK;
+}
+
+static const UInt32 kBlockSize = 16;
+
+STDMETHODIMP_(UInt32) CDecoder::Filter(Byte *data, UInt32 size)
+{
+  if (size == 0)
+    return 0;
+  if (size < kBlockSize)
+    return kBlockSize;
+  UInt32 i;
+  size -= kBlockSize;
+  for (i = 0; i <= size; i += kBlockSize)
+    _cipher.DecryptBlock(data + i);
+  return i;
+}
+
+}}