Initial community commit

Src/external_dependencies/openmpt-trunk/include/unrar/crypt1.cpp

@@ -0,0 +1,79 @@
+extern uint CRCTab[256];
+
+void CryptData::SetKey13(const char *Password)
+{
+  Key13[0]=Key13[1]=Key13[2]=0;
+  for (size_t I=0;Password[I]!=0;I++)
+  {
+    byte P=Password[I];
+    Key13[0]+=P;
+    Key13[1]^=P;
+    Key13[2]+=P;
+    Key13[2]=(byte)rotls(Key13[2],1,8);
+  }
+}
+
+
+void CryptData::SetKey15(const char *Password)
+{
+  InitCRC32(CRCTab);
+  uint PswCRC=CRC32(0xffffffff,Password,strlen(Password));
+  Key15[0]=PswCRC&0xffff;
+  Key15[1]=(PswCRC>>16)&0xffff;
+  Key15[2]=Key15[3]=0;
+  for (size_t I=0;Password[I]!=0;I++)
+  {
+    byte P=Password[I];
+    Key15[2]^=P^CRCTab[P];
+    Key15[3]+=P+(CRCTab[P]>>16);
+  }
+}
+
+
+void CryptData::SetAV15Encryption()
+{
+  InitCRC32(CRCTab);
+  Method=CRYPT_RAR15;
+  Key15[0]=0x4765;
+  Key15[1]=0x9021;
+  Key15[2]=0x7382;
+  Key15[3]=0x5215;
+}
+
+
+void CryptData::SetCmt13Encryption()
+{
+  Method=CRYPT_RAR13;
+  Key13[0]=0;
+  Key13[1]=7;
+  Key13[2]=77;
+}
+
+
+void CryptData::Decrypt13(byte *Data,size_t Count)
+{
+  while (Count--)
+  {
+    Key13[1]+=Key13[2];
+    Key13[0]+=Key13[1];
+    *Data-=Key13[0];
+    Data++;
+  }
+}
+
+
+void CryptData::Crypt15(byte *Data,size_t Count)
+{
+  while (Count--)
+  {
+    Key15[0]+=0x1234;
+    Key15[1]^=CRCTab[(Key15[0] & 0x1fe)>>1];
+    Key15[2]-=CRCTab[(Key15[0] & 0x1fe)>>1]>>16;
+    Key15[0]^=Key15[2];
+    Key15[3]=rotrs(Key15[3]&0xffff,1,16)^Key15[1];
+    Key15[3]=rotrs(Key15[3]&0xffff,1,16);
+    Key15[0]^=Key15[3];
+    *Data^=(byte)(Key15[0]>>8);
+    Data++;
+  }
+}