void exercise4(){
/* Exercise 4 */
// Detect single-character XOR
bool failed = false;
vector<Xstr> possible_strings;
string line;
ifstream string_file("test_files/encoded_ex4.txt");
Xstr output("Now that the party is jumping\n");
int max_idx = -1;
bool max_found = false;
decoded_message max_message;
max_message.score = 0;
max_message.decoded = Xstr();
// read string into vector from file
if (string_file.is_open()){
while( getline(string_file, line) ){
Xstr ascii_string(line, Xstr::HEX_ENCODED );
possible_strings.push_back( ascii_string );
}
string_file.close();
}
else{
cout << "Unable to open file" << endl;
failed = true;
goto eval4;
}
// iterate through potential strings and find the best solution for each.
// Regard string with highest score as encoded string
for(Xstr next_str: possible_strings){
decoded_message message = solve_single_byte_xor( next_str );
if(message.score > max_message.score){
max_found = true;
max_message.score = message.score;
max_message.decoded = message.decoded;
}
}
if(max_message.decoded != output)
failed = true;
eval4:
crypto_exercise_test(4, !failed);
}
void
dump_gnu_request(struct gnu_request *req, int in_gdb)
{
int others;
char buf[BUFSIZE];
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
console("%scommand: %d (%s)\n", in_gdb ? "GDB IN: " : "GDB OUT: ",
req->command, gdb_command_string(req->command, buf, TRUE));
console("buf: %lx ", req->buf);
if (req->buf && ascii_string(req->buf))
console(" \"%s\"", req->buf);
console("\n");
console("fp: %lx ", req->fp);
if (req->fp == pc->nullfp)
console("(pc->nullfp) ");
if (req->fp == pc->stdpipe)
console("(pc->stdpipe) ");
if (req->fp == pc->pipe)
console("(pc->pipe) ");
if (req->fp == pc->ofile)
console("(pc->ofile) ");
if (req->fp == pc->ifile)
console("(pc->ifile) ");
if (req->fp == pc->ifile_pipe)
console("(pc->ifile_pipe) ");
if (req->fp == pc->ifile_ofile)
console("(pc->ifile_ofile) ");
if (req->fp == pc->tmpfile)
console("(pc->tmpfile) ");
if (req->fp == pc->saved_fp)
console("(pc->saved_fp) ");
if (req->fp == pc->tmp_fp)
console("(pc->tmp_fp) ");
console("flags: %lx (", req->flags);
others = 0;
if (req->flags & GNU_PRINT_LINE_NUMBERS)
console("%sGNU_PRINT_LINE_NUMBERS", others++ ? "|" : "");
if (req->flags & GNU_FUNCTION_ONLY)
console("%sGNU_FUNCTION_ONLY", others++ ? "|" : "");
if (req->flags & GNU_PRINT_ENUMERATORS)
console("%sGNU_PRINT_ENUMERATORS", others++ ? "|" : "");
if (req->flags & GNU_RETURN_ON_ERROR)
console("%sGNU_RETURN_ON_ERROR", others++ ? "|" : "");
if (req->flags & GNU_FROM_TTY_OFF)
console("%sGNU_FROM_TTY_OFF", others++ ? "|" : "");
if (req->flags & GNU_NO_READMEM)
console("%sGNU_NO_READMEM", others++ ? "|" : "");
if (req->flags & GNU_VAR_LENGTH_TYPECODE)
console("%sGNU_VAR_LENGTH_TYPECODE", others++ ? "|" : "");
console(")\n");
console("addr: %lx ", req->addr);
console("addr2: %lx ", req->addr2);
console("count: %ld\n", req->count);
if ((ulong)req->name > (ulong)PATCH_KERNEL_SYMBOLS_STOP)
console("name: \"%s\" ", req->name);
else
console("name: %lx ", (ulong)req->name);
console("length: %ld ", req->length);
console("typecode: %d\n", req->typecode);
#if defined(GDB_5_3) || defined(GDB_6_0) || defined(GDB_6_1) || defined(GDB_7_0)
console("typename: %s\n", req->typename);
#else
console("type_name: %s\n", req->type_name);
#endif
console("target_typename: %s\n", req->target_typename);
console("target_length: %ld ", req->target_length);
console("target_typecode: %d ", req->target_typecode);
console("is_typedef: %d ", req->is_typedef);
console("member: \"%s\" ", req->member);
console("member_offset: %ld\n", req->member_offset);
console("member_length: %ld\n", req->member_length);
console("member_typecode: %d\n", req->member_typecode);
console("value: %lx ", req->value);
console("tagname: \"%s\" ", req->tagname);
console("pc: %lx ", req->pc);
if (is_kernel_text(req->pc))
console("(%s)", value_to_symstr(req->pc, buf, 0));
console("\n");
console("sp: %lx ", req->sp);
console("ra: %lx ", req->ra);
console("frame: %ld ", req->frame);
console("prevsp: %lx\n", req->prevsp);
console("prevpc: %lx ", req->prevpc);
console("lastsp: %lx ", req->lastsp);
console("task: %lx ", req->task);
console("debug: %lx\n", req->debug);
console("\n");
}
