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Merge pull request 'Hauptimplementierung' (#4) from feat/main-implementation into master

Browse source 
Reviewed-on: https://gitlab-gepasp.in.tum.de/gra22s/team199/pulls/4
Reviewed-by: Thomas Florian <thomas.florian@tum.de>
This commit is contained in:
Dorian Zedler 2022-06-29 22:09:26 +02:00
commit 65b433e41c
17 changed files with 279 additions and 49 deletions
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1
.gitignore vendored
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@ -1 +0,0 @@
build

3
.vscode/extensions.json vendored
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@ -1,6 +1,5 @@
{
"recommendations": [
"ms-vscode.cpptools",
"twxs.cmake"
"ms-vscode.cpptools"
]
}

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.vscode/launch.json vendored Normal file
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@ -0,0 +1,29 @@
{
// Use IntelliSense to learn about possible attributes.
// Hover to view descriptions of existing attributes.
// For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
"version": "0.2.0",
"configurations": [
{
"type": "cppdbg",
"request": "launch",
"name": "C/C++: gcc debug active file",
"program": "${workspaceFolder}/Implementierung/md2",
"args": [
"${workspaceFolder}/Implementierung/testfile"
],
"cwd": "${workspaceFolder}",
"externalConsole": false,
"MIMode": "gdb",
"setupCommands": [
{
"description": "Enable pretty-printing for gdb",
"text": "-enable-pretty-printing",
"ignoreFailures": true
}
],
"preLaunchTask": "C/C++: gcc build active file",
"miDebuggerPath": "/usr/bin/gdb"
}
]
}

18
.vscode/settings.json vendored
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@ -2,8 +2,22 @@
"C_Cpp.clang_format_fallbackStyle": "Google",
"files.associations": {
"functional": "c",
"helper.h": "c"
"helper.h": "c",
"string": "c",
"vector": "c",
"memory": "c",
"optional": "c",
"string_view": "c",
"system_error": "c",
"variant": "c",
"array": "c",
"md2.h": "c",
"io.h": "c"
},
"editor.formatOnSave": true,
"cmake.sourceDirectory": "${workspaceFolder}/Implementierung"
"C_Cpp.default.includePath": [
"./lib",
"./Implementierung/lib",
"../lib"
]
}

4
.vscode/tasks.json vendored
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@ -7,9 +7,9 @@
"args": [
"-fdiagnostics-color=always",
"-g",
"${file}",
"${fileDirname}/*.c",
"-o",
"${fileDirname}/${fileBasenameNoExtension}"
"${fileDirname}/../md2"
],
"options": {
"cwd": "${fileDirname}"

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Ausarbeitung/Ausarbeitung.pdf Normal file
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Ausarbeitung/Ausarbeitung.tex
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@ -4,10 +4,10 @@
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% TODO: Ersetzen Sie in den folgenden Zeilen die entsprechenden -Texte-
%% mit den richtigen Werten.
\newcommand{\theGroup}{IhreGruppennummer} % Beispiel: 42
\newcommand{\theNumber}{IhreProjektnummer} % Beispiel: A123
\author{Vorname1 Nachname1 \and Vorname2 Nachname2 \and Vorname3 Nachname3}
\date{AktuellesSemester} % Beispiel: Wintersemester 2019/20
\newcommand{\theGroup}{199} % Beispiel: 42
\newcommand{\theNumber}{A505} % Beispiel: A123
\author{Dorian Zedler \and Finn Dröge \and Thomas Florian}
\date{Sommersemester 2022} % Beispiel: Wintersemester 2019/20
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Diese Zeile bitte -nicht- aendern.

5
Implementierung/.gitignore vendored
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@ -1,5 +1,2 @@
Makefile
cmake_install.cmake
CMakeCache.txt
build
md2
CMakeFiles

0
Implementierung/.gitkeep
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19
Implementierung/CMakeLists.txt
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@ -1,19 +0,0 @@
cmake_minimum_required(VERSION 3.0.0)
# here we specify that the project is C language only, so the default
# C compiler on the system will be used
project(md2 C)
add_executable(md2 "")
set(SOURCE_FILES
src/main.c
src/helper.c
src/io.c
src/md2.c
)
target_sources(md2 PRIVATE ${SOURCE_FILES})
target_include_directories(md2 PUBLIC
lib
)

32
Implementierung/Makefile Normal file
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@ -0,0 +1,32 @@
SRC = src/main.c src/helper.c src/io.c src/md2.c
OBJ = ${subst src,build,${SRC:.c=.o}}
CC = gcc
CFLAGS = -Ilib -ggdb
LDFLAGS =
all: md2
clean:
rm -rf md2 build
help:
@echo === Project Build Help ===
@echo
@echo Available targets:
@echo - all: build everything
@echo - clean: clean distfiles
@echo - help: show this help
build:
mkdir build
build/%.o: src/%.c
@mkdir -p build
${CC} -c ${CFLAGS} -o $@ $<
md2: ${OBJ}
${CC} -o $@ $(OBJ) ${LDFLAGS}
.PHONY: all clean help

7
Implementierung/lib/io.h
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@ -1,7 +1,10 @@
#ifndef IO_H
#define IO_H
#define _XOPEN_SOURCE
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
@ -12,8 +15,8 @@
*
* @param path the filepath
* @param size a pointer where the size of the result should be stored
* @return the raw data
* @return pointer to the raw data or NULL on errors
*/
static uint8_t* read_file(const char* path, size_t* size);
uint8_t* read_file(const char* path, size_t* size);
#endif // IO_H

11
Implementierung/lib/md2.h
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@ -2,6 +2,9 @@
#define MD2_H
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
/**
@ -22,4 +25,12 @@ void md2_hash(size_t len, const uint8_t buf[], uint8_t out[16]);
*/
void md2_checksum(size_t len, uint8_t* buf);
/**
* @brief Takes a uint8_t array and converts it into a string
*
* @param hash the array containing the hash
* @param stringHash pointer to store the string, has to have 32 bytes space
*/
void encodeHash(uint8_t hash[16], char* stringHash);
#endif // MD2_H

2
Implementierung/src/helper.c
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@ -1,4 +1,4 @@
#include "helper.h"
#include "../lib/helper.h"
int stringToInt(char *string) {
char *leftover = "";

8
Implementierung/src/io.c
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@ -1,6 +1,6 @@
#include "io.h"
#include "../lib/io.h"
static uint8_t* read_file(const char* path, size_t* size) {
uint8_t* read_file(const char* path, size_t* size) {
// Read the contents of the file specified by path into a heap-allocated
// buffer and return a pointer to that buffer.
FILE* f = fopen(path, "r");
@ -28,7 +28,7 @@ static uint8_t* read_file(const char* path, size_t* size) {
size_t bytesRead =
fread(data, statOfFile.st_blksize, statOfFile.st_blocks, f);
// Or: size_t bytesRead = fread(data, sizeof(char), statOfFile.st_size, f);
// size_t bytesRead = fread(data, sizeof(uint8_t), statOfFile.st_size, f);
if (bytesRead != 0 && !feof(f)) {
printf("Error reading file!\n");
fclose(f);
@ -37,6 +37,6 @@ static uint8_t* read_file(const char* path, size_t* size) {
fclose(f);
(*size) = bytesRead;
(*size) = statOfFile.st_size;
return data;
}

72
Implementierung/src/main.c
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@ -1,6 +1,51 @@
#include "helper.h"
#include "io.h"
#include "md2.h"
#include <stdbool.h>
#include "../lib/helper.h"
#include "../lib/io.h"
#include "../lib/md2.h"
// Returns true when val is approx. equal to exp.
static bool runTest(const char* message, const char* expectedHash) {
uint8_t out[16];
md2_hash(strlen(message), message, out);
char hash[32];
encodeHash(out, hash);
bool ok = !strcmp(hash, expectedHash);
printf("%s: md2(%s) %s == %s\n", "not ok" + (4 * ok), message, hash,
expectedHash);
return ok;
}
unsigned runTests(void) {
unsigned failed = 0;
// Note: cases with n<2 are not tested here.
failed += !runTest("", "8350e5a3e24c153df2275c9f80692773");
failed += !runTest("a", "32ec01ec4a6dac72c0ab96fb34c0b5d1");
failed += !runTest("abc", "da853b0d3f88d99b30283a69e6ded6bb");
failed += !runTest("message digest", "ab4f496bfb2a530b219ff33031fe06b0");
failed += !runTest("jebdjcslfhwfdig", "e1b69085c6f6e36cb8fe8d98ed3f2c35");
failed += !runTest("0123456789abcde", "d95629645108a20ab4d70e8545e0723b");
failed += !runTest("0123456789abcdef", "12c8dfa285f14e1af8c5254e7092d0d3");
failed += !runTest("0123456789abcdefg", "e4d0efded5ef7b6843a5ba47e1171347");
failed += !runTest("abcdefghijklmnopqrstuvwxyz",
"4e8ddff3650292ab5a4108c3aa47940b");
failed +=
!runTest("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789",
"da33def2a42df13975352846c30338cd");
failed += !runTest(
"123456789012345678901234567890123456789012345678901234567890123456789012"
"34567890",
"d5976f79d83d3a0dc9806c3c66f3efd8");
if (failed)
printf("%u tests FAILED\n", failed);
else
printf("All tests PASSED\n");
return failed;
}
int main(int argc, char** argv) {
struct configuration c;
@ -20,5 +65,26 @@ int main(int argc, char** argv) {
"benchmark cycles: %d\n",
c.filename, c.implementationToUse, c.doBenchmark, c.benchmarkingCycles);
// runTests();
size_t len;
uint8_t* data = read_file(c.filename, &len);
if (data == NULL) {
printf("Error reading file %s!", c.filename);
return EXIT_FAILURE;
}
printf("File read with size: %zu\n", len);
printf("\n");
uint8_t out[16];
md2_hash(len, data, out);
printf("Hash: ");
char hash[32];
encodeHash(out, hash);
printf("%s\n", hash);
free(data);
return 0;
}

105
Implementierung/src/md2.c
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@ -1,8 +1,107 @@
#include "io.h"
#include "../lib/md2.h"
// The file "testfile" should lead to this hash:
// fc982e558db259f298b43cd4c1241c66
void md2_checksum(size_t len, uint8_t* buf) {}
// Source: https://datatracker.ietf.org/doc/html/rfc1319
static unsigned char PI_SUBST[256] = {
41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 76,
130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 138,
23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 245, 142,
187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63, 148, 194, 16,
137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50, 39, 53, 62,
204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165, 181, 209, 215,
94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210, 150, 164, 125, 182,
118, 252, 107, 226, 156, 116, 4, 241, 69, 157, 112, 89, 100, 113, 135,
32, 134, 91, 207, 101, 230, 45, 168, 2, 27, 96, 37, 173, 174, 176,
185, 246, 28, 70, 97, 105, 52, 64, 126, 15, 85, 71, 163, 35, 221,
81, 175, 58, 195, 92, 249, 206, 186, 197, 234, 38, 44, 83, 13, 110,
133, 40, 132, 9, 211, 223, 205, 244, 65, 129, 77, 82, 106, 220, 55,
200, 108, 193, 171, 250, 36, 225, 123, 8, 12, 189, 177, 74, 120, 136,
149, 139, 227, 99, 232, 109, 233, 203, 213, 254, 59, 0, 29, 57, 242,
239, 183, 14, 102, 88, 208, 228, 166, 119, 114, 248, 235, 117, 75, 10,
49, 68, 80, 180, 143, 237, 31, 26, 219, 153, 141, 51, 159, 17, 131,
20};
void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {}
void printBuf(size_t len, uint8_t buf[len]) {
for (int i = 0; i < len; i++) {
printf("'%02x',", buf[i]);
}
printf("\n");
}
void md2_checksum(size_t len, uint8_t* buf) {
uint8_t l = 0;
for (int i = 0; i < len / 16; i++) {
for (int j = 0; j < 16; j++) {
u_int8_t c = buf[i * 16 + j];
// reference is wrong. It says: Set C[j] to S[c xor L]. But it should be:
l = buf[len + j] ^= PI_SUBST[c ^ l];
}
}
}
void md2_hash(size_t len, const uint8_t buf[len], uint8_t out[16]) {
// === step 1 ===
int paddingNeeded = 16 - (len % 16);
uint8_t originalPadding = paddingNeeded;
len += paddingNeeded;
// printf("len: %d\n", len);
// +16 for the checksum
uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
memcpy(newBuf, buf, len - paddingNeeded);
// printBuf(len + 16, newBuf);
while (paddingNeeded > 0) {
newBuf[len - paddingNeeded] = originalPadding;
paddingNeeded--;
}
// printf("buf with padding: ");
// printBuf(len + 16, newBuf);
// === step 2 ===
md2_checksum(len, newBuf);
// printf("buf with cecksum: ");
// printBuf(len + 16, newBuf);
// === step 3 ===
uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
// === step 4 ===
// <= because we need to hash the last block too
for (int i = 0; i <= (len + 16) / 16 - 1; i++) {
for (int j = 0; j < 16; j++) {
messageDigestBuf[16 + j] = newBuf[i * 16 + j];
messageDigestBuf[32 + j] =
(messageDigestBuf[16 + j] ^ messageDigestBuf[j]);
}
u_int8_t t = 0;
for (int j = 0; j < 18; j++) {
for (int k = 0; k < 48; k++) {
t = messageDigestBuf[k] = messageDigestBuf[k] ^ PI_SUBST[t];
}
t = (t + j) % 256;
}
}
// printf("messageDigestBuf: \n");
// printBuf(16, messageDigestBuf);
memcpy(out, messageDigestBuf, 16);
free(messageDigestBuf);
free(newBuf);
}
void encodeHash(uint8_t hash[16], char* stringHash) {
for (int i = 0; i < 16; i++) {
sprintf(stringHash + (2 * i), "%02x", hash[i]);
}
}