int __fastcall Cryptography__DecryptBytes(int a1, int a2, int a3)   //a2 = data byte[] , a3 = key byte[]
{
  int v3; // r4
  int v4; // r6
  signed int v5; // r7
  int v6; // r5
  signed int v7; // r0
  unsigned int v8; // r8
  unsigned int v9; // r9
  int v10; // r0
  int v11; // r10
  int v12; // r0
  char v13; // r5
  int v14; // r0
  int v15; // r0
  int v16; // r0
  bool v17; // nf
  unsigned __int8 v18; // vf
  int v20; // [sp+0h] [bp-30h]
  int v21; // [sp+4h] [bp-2Ch]
  int v22; // [sp+8h] [bp-28h]
  signed int v23; // [sp+Ch] [bp-24h]
  int v24; // [sp+10h] [bp-20h]

  v3 = a2;
  v20 = a2;
  if ( !a3 )
  {
    ((void (__fastcall *)(_DWORD))loc_1DBC304)(0);  //Initialize
    a3 = 0;
  }
  v21 = v3 + 16;
  v4 = a3 + 16;
  v22 = a3;
  v5 = 0;
  v23 = *(_DWORD *)(a3 + 12);
  v6 = 0;
  while ( 1 )
  {
    if ( !v3 )
      ((void (__fastcall *)(_DWORD))loc_1DBC304)(0);    //Initialize
    v7 = *(_DWORD *)(v3 + 12);
    if ( v5 >= v7 )
      break;
    if ( v23 >= 1 )
    {
      v8 = 0;
      if ( v5 < v7 )
      {
        do
        {
          v9 = v5 + v8;
          v24 = v6;
          if ( v7 <= v5 + v8 )
          {
            v10 = sub_1DBD1E4();    //IndexOutOfRangeException
            ((void (__fastcall *)(int, _DWORD, _DWORD))loc_1DBC270)(v10, 0, 0);
          }
          v11 = v21 + v8;
          v12 = v22;
          v13 = *(_BYTE *)(v21 + v8 + v5);
          if ( !v22 )
          {
            ((void (__fastcall *)(_DWORD))loc_1DBC304)(0);
            v12 = v22;
            v3 = v20;
          }
          if ( *(_DWORD *)(v12 + 12) <= v8 )
          {
            v14 = sub_1DBD1E4();        //IndexOutOfRangeException
            ((void (__fastcall *)(int, _DWORD, _DWORD))loc_1DBC270)(v14, 0, 0);
          }
          *(_BYTE *)(v11 + v5) = *(_BYTE *)(v4 + v8) ^ v13;
          if ( !v3 )
            ((void (__fastcall *)(_DWORD))loc_1DBC304)(0);
          if ( *(_DWORD *)(v3 + 12) <= v9 )
          {
            v15 = sub_1DBD1E4();
            ((void (__fastcall *)(int, _DWORD, _DWORD))loc_1DBC270)(v15, 0, 0);
          }
          v6 = *(unsigned __int8 *)(v11 + v5) ^ v24;
          *(_BYTE *)(v11 + v5) = v6;
          if ( *(_DWORD *)(v3 + 12) <= v9 )
          {
            v16 = sub_1DBD1E4();
            ((void (__fastcall *)(int, _DWORD, _DWORD))loc_1DBC270)(v16, 0, 0);
            v6 = *(unsigned __int8 *)(v11 + v5);
          }
          v7 = v23;
          v18 = __OFSUB__(++v8, v23);
          v17 = (signed int)(v8 - v23) < 0;
          if ( (signed int)v8 < v23 )
          {
            v7 = *(_DWORD *)(v3 + 12);
            v18 = __OFSUB__(v5 + v8, v7);
            v17 = (signed int)(v5 + v8 - v7) < 0;
          }
        }
        while ( v17 ^ v18 );
      }
    }
    v5 += v23;
  }
  return v3;
}