Merge pull request 'feat/impl-2' (#5) from feat/impl-2 into master
Reviewed-on: https://gitlab-gepasp.in.tum.de/gra22s/team199/pulls/5 Reviewed-by: Thomas Florian <thomas.florian@tum.de>
This commit is contained in:
commit
99cd6d2d51
7 changed files with 207 additions and 38 deletions
|
@ -1,6 +1,6 @@
|
||||||
|
|
||||||
|
|
||||||
SRC = src/main.c src/helper.c src/io.c src/md2.c src/md2_impls/md2_common.c src/md2_impls/md2_0.c
|
SRC = src/main.c src/helper.c src/io.c src/md2.c src/md2_impls/md2_common.c src/md2_impls/md2_0.c src/md2_impls/md2_2.c
|
||||||
OBJ = ${subst src,build,${SRC:.c=.o}}
|
OBJ = ${subst src,build,${SRC:.c=.o}}
|
||||||
CC = gcc
|
CC = gcc
|
||||||
CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3
|
CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3
|
||||||
|
|
|
@ -10,6 +10,17 @@
|
||||||
#include <stdlib.h>
|
#include <stdlib.h>
|
||||||
#include <sys/stat.h>
|
#include <sys/stat.h>
|
||||||
|
|
||||||
|
/**
|
||||||
|
* @brief Open a file and load its stats
|
||||||
|
*
|
||||||
|
* @param path the filepath
|
||||||
|
* @param file where the pointer of the file handle should be stored
|
||||||
|
* @param file_stat pointer to a stat struct
|
||||||
|
* @return true it worked
|
||||||
|
* @return false there was an error
|
||||||
|
*/
|
||||||
|
bool open_file(const char* path, FILE** file, struct stat* file_stat);
|
||||||
|
|
||||||
/**
|
/**
|
||||||
* @brief reads a file at a path
|
* @brief reads a file at a path
|
||||||
*
|
*
|
||||||
|
|
23
Implementierung/lib/md2_impls/md2_2.h
Normal file
23
Implementierung/lib/md2_impls/md2_2.h
Normal file
|
@ -0,0 +1,23 @@
|
||||||
|
#ifndef MD2_2_H
|
||||||
|
#define MD2_2_H
|
||||||
|
|
||||||
|
#include <stdbool.h>
|
||||||
|
#include <stdint.h>
|
||||||
|
#include <stdio.h>
|
||||||
|
#include <stdlib.h>
|
||||||
|
#include <string.h>
|
||||||
|
#include <sys/types.h>
|
||||||
|
|
||||||
|
#include "../io.h"
|
||||||
|
|
||||||
|
/**
|
||||||
|
* @brief This implementation loads the file in bits and not at once
|
||||||
|
*
|
||||||
|
* @param _ unused
|
||||||
|
* @param filename name of the file to load
|
||||||
|
* @param out
|
||||||
|
*/
|
||||||
|
void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]);
|
||||||
|
void md2_checksum_2(size_t len, uint8_t* buf);
|
||||||
|
|
||||||
|
#endif // MD2_2_H
|
|
@ -1,26 +1,35 @@
|
||||||
#include "../lib/io.h"
|
#include "../lib/io.h"
|
||||||
|
|
||||||
|
bool open_file(const char* path, FILE** file, struct stat* file_stat) {
|
||||||
|
(*file) = fopen(path, "r");
|
||||||
|
if ((*file) == NULL) {
|
||||||
|
if (errno == 0) errno = EIO;
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
int status = fstat(fileno((*file)), file_stat);
|
||||||
|
if (status == -1) {
|
||||||
|
if (errno == 0) errno = EIO;
|
||||||
|
fclose((*file));
|
||||||
|
return false;
|
||||||
|
};
|
||||||
|
|
||||||
|
if ((file_stat->st_mode & S_IFMT) != S_IFREG) {
|
||||||
|
printf("File is not a regular file!\n");
|
||||||
|
errno = ENOENT;
|
||||||
|
fclose((*file));
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
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
|
// Read the contents of the file specified by path into a heap-allocated
|
||||||
// buffer and return a pointer to that buffer.
|
// buffer and return a pointer to that buffer.
|
||||||
FILE* f = fopen(path, "r");
|
FILE* f;
|
||||||
if (f == NULL) {
|
|
||||||
printf("Fopen error: %d\n", errno);
|
|
||||||
fclose(f);
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
struct stat statOfFile;
|
struct stat statOfFile;
|
||||||
int status = fstat(fileno(f), &statOfFile);
|
if (!open_file(path, &f, &statOfFile)) {
|
||||||
if (status == -1) {
|
|
||||||
printf("Fstat error: %d\n", errno);
|
|
||||||
fclose(f);
|
|
||||||
return NULL;
|
|
||||||
};
|
|
||||||
|
|
||||||
if ((statOfFile.st_mode & S_IFMT) != S_IFREG) {
|
|
||||||
printf("File is not a regular file!\n");
|
|
||||||
fclose(f);
|
|
||||||
return NULL;
|
return NULL;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
@ -30,8 +39,8 @@ uint8_t* read_file(const char* path, size_t* size) {
|
||||||
fread(data, statOfFile.st_blksize, statOfFile.st_blocks, f);
|
fread(data, statOfFile.st_blksize, statOfFile.st_blocks, f);
|
||||||
// size_t bytesRead = fread(data, sizeof(uint8_t), statOfFile.st_size, f);
|
// size_t bytesRead = fread(data, sizeof(uint8_t), statOfFile.st_size, f);
|
||||||
if (bytesRead != 0 && !feof(f)) {
|
if (bytesRead != 0 && !feof(f)) {
|
||||||
printf("Error reading file!\n");
|
|
||||||
fclose(f);
|
fclose(f);
|
||||||
|
if (errno == 0) errno = EIO;
|
||||||
return NULL;
|
return NULL;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
|
@ -62,6 +62,43 @@ unsigned runTests(struct configuration* c) {
|
||||||
return failed;
|
return failed;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
bool calculate_hash(struct configuration c, char* hash) {
|
||||||
|
size_t len;
|
||||||
|
uint8_t* data;
|
||||||
|
|
||||||
|
if (c.implementationToUse != 2) {
|
||||||
|
data = read_file(c.filename, &len);
|
||||||
|
} else {
|
||||||
|
data = (uint8_t*)c.filename;
|
||||||
|
len = 0;
|
||||||
|
}
|
||||||
|
|
||||||
|
if (data == NULL) {
|
||||||
|
printf("Error reading file %s!\n", c.filename);
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
errno = 0;
|
||||||
|
uint8_t out[16];
|
||||||
|
if (c.doBenchmark) {
|
||||||
|
double duration =
|
||||||
|
run_benchmark(c.benchmarkingCycles, md2_hash, len, data, out);
|
||||||
|
printf("Running %d cycles took %f seconds\n", c.benchmarkingCycles,
|
||||||
|
duration);
|
||||||
|
} else {
|
||||||
|
md2_hash(len, data, out);
|
||||||
|
}
|
||||||
|
|
||||||
|
if (errno != 0) {
|
||||||
|
return false;
|
||||||
|
}
|
||||||
|
|
||||||
|
md2_encode_hash(out, hash);
|
||||||
|
|
||||||
|
if (c.implementationToUse != 2) free(data);
|
||||||
|
return true;
|
||||||
|
}
|
||||||
|
|
||||||
int main(int argc, char** argv) {
|
int main(int argc, char** argv) {
|
||||||
struct configuration c;
|
struct configuration c;
|
||||||
enum argumentParseResult result = parseArguments(argc, argv, &c);
|
enum argumentParseResult result = parseArguments(argc, argv, &c);
|
||||||
|
@ -87,33 +124,27 @@ int main(int argc, char** argv) {
|
||||||
"benchmark cycles: %d\n",
|
"benchmark cycles: %d\n",
|
||||||
c.implementationToUse, c.doBenchmark, c.benchmarkingCycles);
|
c.implementationToUse, c.doBenchmark, c.benchmarkingCycles);
|
||||||
|
|
||||||
|
if (c.runTests && c.implementationToUse == 2) {
|
||||||
|
fprintf(stderr, "Cannot run tests on implementation 2!\n");
|
||||||
|
return EXIT_FAILURE;
|
||||||
|
}
|
||||||
|
|
||||||
if (c.runTests) {
|
if (c.runTests) {
|
||||||
printf("Running tests...\n\n");
|
printf("Running tests...\n\n");
|
||||||
return runTests(&c);
|
return runTests(&c);
|
||||||
}
|
}
|
||||||
|
|
||||||
printf("Hashing file %s...\n\n", c.filename);
|
printf("Hashing file %s...\n\n", c.filename);
|
||||||
size_t len;
|
|
||||||
uint8_t* data = read_file(c.filename, &len);
|
char hash[32];
|
||||||
if (data == NULL) {
|
if (!calculate_hash(c, hash)) {
|
||||||
printf("Error reading file %s!", c.filename);
|
if (errno != 0) {
|
||||||
|
fprintf(stderr, "\n\033[0;31mAn error occured: %s\033[0m\n",
|
||||||
|
strerror(errno));
|
||||||
|
}
|
||||||
return EXIT_FAILURE;
|
return EXIT_FAILURE;
|
||||||
}
|
}
|
||||||
|
|
||||||
uint8_t out[16];
|
|
||||||
char hash[32];
|
|
||||||
if (c.doBenchmark) {
|
|
||||||
double duration =
|
|
||||||
run_benchmark(c.benchmarkingCycles, md2_hash, len, data, out);
|
|
||||||
printf("Running %d cycles took %f seconds\n", c.benchmarkingCycles,
|
|
||||||
duration);
|
|
||||||
} else {
|
|
||||||
md2_hash(len, data, out);
|
|
||||||
}
|
|
||||||
md2_encode_hash(out, hash);
|
|
||||||
printf("Hash: %s\n", hash);
|
printf("Hash: %s\n", hash);
|
||||||
|
|
||||||
free(data);
|
return EXIT_SUCCESS;
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
}
|
||||||
|
|
|
@ -2,6 +2,7 @@
|
||||||
|
|
||||||
// include all implementations
|
// include all implementations
|
||||||
#include "../lib/md2_impls/md2_0.h"
|
#include "../lib/md2_impls/md2_0.h"
|
||||||
|
#include "../lib/md2_impls/md2_2.h"
|
||||||
|
|
||||||
md2_hash_func md2_hash;
|
md2_hash_func md2_hash;
|
||||||
md2_checksum_func md2_checksum;
|
md2_checksum_func md2_checksum;
|
||||||
|
@ -22,6 +23,11 @@ bool md2_choose_implementation(int i) {
|
||||||
md2_checksum = md2_checksum_0;
|
md2_checksum = md2_checksum_0;
|
||||||
return true;
|
return true;
|
||||||
|
|
||||||
|
case 2:
|
||||||
|
md2_hash = md2_hash_2;
|
||||||
|
md2_checksum = md2_checksum_2;
|
||||||
|
return true;
|
||||||
|
|
||||||
default:
|
default:
|
||||||
return false;
|
return false;
|
||||||
}
|
}
|
||||||
|
|
89
Implementierung/src/md2_impls/md2_2.c
Normal file
89
Implementierung/src/md2_impls/md2_2.c
Normal file
|
@ -0,0 +1,89 @@
|
||||||
|
#include "../../lib/md2_impls/md2_2.h"
|
||||||
|
|
||||||
|
#include "../../lib/md2_impls/md2_common.h"
|
||||||
|
|
||||||
|
void process_block_hash(uint8_t block[16], uint8_t messageDigestBuf[48]) {
|
||||||
|
for (int j = 0; j < 16; j++) {
|
||||||
|
messageDigestBuf[16 + j] = block[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] ^ MD2_PI_SUBST[t];
|
||||||
|
}
|
||||||
|
t = (t + j) % 256;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void process_block_checksum(uint8_t block[16], uint8_t checksum[16],
|
||||||
|
uint8_t* l) {
|
||||||
|
for (int j = 0; j < 16; j++) {
|
||||||
|
u_int8_t c = block[j];
|
||||||
|
// reference is wrong. It says: Set C[j] to S[c xor L]. But it should be:
|
||||||
|
(*l) = checksum[j] ^= MD2_PI_SUBST[c ^ (*l)];
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void apply_padding(size_t len, uint8_t buf[16]) {
|
||||||
|
int paddingNeeded = 16 - (len % 16);
|
||||||
|
uint8_t originalPadding = paddingNeeded;
|
||||||
|
len += paddingNeeded;
|
||||||
|
|
||||||
|
while (paddingNeeded > 0) {
|
||||||
|
buf[len - paddingNeeded] = originalPadding;
|
||||||
|
paddingNeeded--;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// unused!
|
||||||
|
void md2_checksum_2(size_t, uint8_t*) {}
|
||||||
|
|
||||||
|
void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]) {
|
||||||
|
FILE* file;
|
||||||
|
struct stat file_stat;
|
||||||
|
if (!open_file((char*)buf, &file, &file_stat)) {
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
// === step 3 ===
|
||||||
|
uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
|
||||||
|
|
||||||
|
// === step 4 ===
|
||||||
|
uint8_t l = 0;
|
||||||
|
uint8_t* checksum = calloc(16, sizeof(uint8_t));
|
||||||
|
|
||||||
|
uint8_t* data = malloc(16);
|
||||||
|
size_t bytes_left_to_read = file_stat.st_size;
|
||||||
|
size_t bytes_left_to_process = 0;
|
||||||
|
|
||||||
|
while (bytes_left_to_read != 0) {
|
||||||
|
bytes_left_to_process = bytes_left_to_read >= 16 ? 16 : bytes_left_to_read;
|
||||||
|
|
||||||
|
fread(data, 1, bytes_left_to_process, file);
|
||||||
|
if (ferror(file) || feof(file)) {
|
||||||
|
if (errno == 0) errno = EIO;
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
|
||||||
|
process_block_checksum(data, checksum, &l);
|
||||||
|
process_block_hash(data, messageDigestBuf);
|
||||||
|
|
||||||
|
bytes_left_to_read -= bytes_left_to_process;
|
||||||
|
};
|
||||||
|
|
||||||
|
fclose(file);
|
||||||
|
|
||||||
|
apply_padding(bytes_left_to_process % 16, data);
|
||||||
|
process_block_checksum(data, checksum, &l);
|
||||||
|
process_block_hash(data, messageDigestBuf);
|
||||||
|
|
||||||
|
process_block_hash(checksum, messageDigestBuf);
|
||||||
|
memcpy(out, messageDigestBuf, 16);
|
||||||
|
|
||||||
|
free(data);
|
||||||
|
free(messageDigestBuf);
|
||||||
|
free(checksum);
|
||||||
|
}
|
Loading…
Reference in a new issue