Initial commit

.vscode/settings.json

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+{
+    "files.associations": {
+        "*.tcc": "cpp",
+        "cctype": "cpp",
+        "clocale": "cpp",
+        "cmath": "cpp",
+        "cstdint": "cpp",
+        "cstdio": "cpp",
+        "cstdlib": "cpp",
+        "cwchar": "cpp",
+        "cwctype": "cpp",
+        "exception": "cpp",
+        "initializer_list": "cpp",
+        "iosfwd": "cpp",
+        "iostream": "cpp",
+        "istream": "cpp",
+        "limits": "cpp",
+        "new": "cpp",
+        "ostream": "cpp",
+        "stdexcept": "cpp",
+        "streambuf": "cpp",
+        "string_view": "cpp",
+        "system_error": "cpp",
+        "type_traits": "cpp",
+        "typeinfo": "cpp"
+    }
+}

codebreak.cpp

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+#include <iostream>
+#include <string>
+#include <vector>
+#include <fstream>
+#include <sstream>
+#include <assert.h>
+
+std::string load_file(std::string filename, size_t end_cut = 0)
+{
+    std::stringstream ret;
+    std::ifstream file(filename);
+    while(file.good())
+    {
+        ret<<(char)file.get();
+    }
+    auto rret = ret.str();
+    rret.resize(rret.size()-end_cut);
+    return rret;
+}
+
+int main(int argc, char** argv)
+{
+    std::vector<std::string> params;
+    for(int i=0;i<argc;i++)
+    {
+        params.push_back(std::string(argv[i]));
+    }
+
+    if(params.size()==2)
+    {
+        auto ciphertext = load_file(params[1],4);
+        int jumper=0;
+        bool is_okay = true;
+        do{
+            is_okay=true;
+            for(size_t idx=0;idx<ciphertext.size();idx++)
+            {
+                if(!isgraph((char)(ciphertext[idx]-jumper+idx)))
+                {   
+                    is_okay=false;
+                    jumper++;
+                }
+            }
+        }while((!is_okay) && jumper<=256);
+        if(is_okay)
+        {
+            for(size_t idx=0;idx<ciphertext.size();idx++)
+            {
+                std::cout<<(char)(ciphertext[idx]-jumper+idx);
+            }
+        }else{
+            std::cout<<"Unable to find a valid representation"<<std::endl;
+        }
+    }
+    else if(params.size()==3)
+    {
+        auto ciphertext = load_file(params[1],4);
+        auto zeroed = load_file(params[2],4);
+        assert(ciphertext.size()==zeroed.size());
+        for(size_t idx=0;idx<ciphertext.size();idx++)
+        {
+            std::cout<<(char)(ciphertext[idx]-zeroed[idx]);
+        }
+    }
+    else
+    {
+        std::cout<<
+        "codebreak 0.1.0\n"
+        "usage:\n"
+        "codebreak encrypted_file [0ed_ciphertext]"
+        <<std::endl;
+    }
+}

test/data1.txt

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+Hello my friend,
+
+This is me!
+
+Good bye ;)

test/data1_enc.txt

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+7U]^bbo^kc`ja*
+Wlny'q|*xq.Y‚ƒy6y‘~:VE]2&

test/data2.txt

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+Another gorgeous file :D

test/data3.txt

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+abcdefgh

test/data3_enc.txt

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+*,.02468)d(�

test/data4.txt

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+hgfedcba

test/data4_enc.txt

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+11111111j'�

test/secondtry.txt

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+2XZU^Yc:`fhm\qo	FsqpqfmlMtzn��JLD" y桃園2ﾏﾑ