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Merge branch 'master' of gitlab-gepasp.in.tum.de:gra22s/team199 into feat/-1

This commit is contained in:
Thomas Florian 2022-07-20 12:28:18 +02:00
parent c28c2d16d0 ace85e64a0
commit e965a9aca7
11 changed files with 196 additions and 18 deletions
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2
Implementierung/.gitignore vendored
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@ -1,3 +1,3 @@
build
md2
testfile*
t

43
Implementierung/Makefile
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@ -1,10 +1,12 @@
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 src/md2_impls/md2_1.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_1.c src/md2_impls/md2_2.c src/md2_impls/md2_3.c
OBJ = ${subst src,build,${SRC:.c=.o}}
CC = gcc
CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3
LDFLAGS =
CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3
LDFLAGS = -pthread
TESTFILES = t/10000 t/1 t/10 t/100 t/1000 #t/2000 t/5000 t/10000
TESTFILES_SIZES = ${subst t/,,${TESTFILES}}
all: md2
@ -18,9 +20,7 @@ help:
@echo - all: build everything
@echo - clean: clean distfiles
@echo - help: show this help
build:
mkdir build
@echo - benchmarks: run benchmarks (only works on linux!)
build/%.o: src/%.c
@mkdir -p build/md2_impls
@ -29,4 +29,33 @@ build/%.o: src/%.c
md2: ${OBJ}
${CC} -o $@ $(OBJ) ${LDFLAGS}
.PHONY: all clean help
t/%:
@echo
@echo "=== Generating ${subst t/,,$@}MB of random data... ==="
dd if=/dev/random of=$@ bs=1M count=${subst t/,,$@} status=progress
@echo "=== done ==="
@echo
benchmarks.csv: md2 ${TESTFILES}
@rm -f $@
@for i in 0 2 3; do \
echo ;\
echo "=== Testing implementation $$i ===";\
for t in $(TESTFILES_SIZES); do \
echo -n "- with $${t}MB ... "; \
if ! rr=$$(./md2 t/$${t} -B1 -V$${i}); then \
echo; \
echo "ERROR!"; \
exit 1; \
fi; \
r=$$(echo $$rr | xargs | sed -e 's/.*took \(.*\) seconds.*/\1/'); \
echo "$${r}s"; \
echo "$${i};$${t};$${r}" >> $@; \
done; \
echo "=== done ===";\
echo;\
done
benchmarks: benchmarks.csv
.PHONY: all clean help benchmarks

1
Implementierung/lib/io.h
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@ -9,6 +9,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <sys/stat.h>
#include <sys/sysinfo.h>
/**
* @brief Open a file and load its stats

1
Implementierung/lib/md2_impls/md2_2.h
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@ -18,6 +18,5 @@
* @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

22
Implementierung/lib/md2_impls/md2_3.h Normal file
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@ -0,0 +1,22 @@
#ifndef MD2_3_H
#define MD2_3_H
#include <pthread.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
/**
* @brief Diese Implementierung benutzt Threads zum Berechnen des Hashs
*
* @param len
* @param buf
* @param out
*/
void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]);
#endif // MD2_3_H

1
Implementierung/lib/md2_impls/md2_common.h
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@ -1,6 +1,7 @@
#ifndef MD2_COMMON_H
#define MD2_COMMON_H
#include <errno.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>

10
Implementierung/src/io.c
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@ -33,9 +33,17 @@ uint8_t* read_file(const char* path, size_t* size) {
return NULL;
}
struct sysinfo info;
int r = sysinfo(&info);
if (r != 0 || info.freeram < (unsigned long)statOfFile.st_size * 2) {
errno = ENOMEM;
return NULL;
}
uint8_t* data = malloc(statOfFile.st_size);
if (data == NULL) {
return;
fclose(f);
return NULL;
}
size_t bytesRead =

5
Implementierung/src/main.c
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@ -5,7 +5,6 @@
#include "../lib/io.h"
#include "../lib/md2.h"
// Returns true when val is approx. equal to exp.
static bool runTest(struct configuration* c, const char* message,
const char* expectedHash) {
uint8_t out[16];
@ -140,8 +139,10 @@ int main(int argc, char** argv) {
char hash[32];
if (!calculate_hash(c, hash)) {
if (errno != 0) {
fprintf(stderr, "\n\033[0;31mAn error occured: %s\033[0m\n",
fprintf(stderr, "\n\033[1;31mAn error occured: %s\033[0m\n",
strerror(errno));
if (errno == ENOMEM)
fprintf(stderr, "\033[1;36mPlease try to use -V2!\033[0m\n");
}
return EXIT_FAILURE;
}

8
Implementierung/src/md2.c
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@ -4,6 +4,7 @@
#include "../lib/md2_impls/md2_0.h"
#include "../lib/md2_impls/md2_1.h"
#include "../lib/md2_impls/md2_2.h"
#include "../lib/md2_impls/md2_3.h"
md2_hash_func md2_hash;
md2_checksum_func md2_checksum;
@ -31,7 +32,12 @@ bool md2_choose_implementation(int i) {
case 2:
md2_hash = md2_hash_2;
md2_checksum = md2_checksum_2;
md2_checksum = NULL;
return true;
case 3:
md2_hash = md2_hash_3;
md2_checksum = NULL;
return true;
default:

7
Implementierung/src/md2_impls/md2_2.c
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@ -38,9 +38,6 @@ void apply_padding(size_t len, uint8_t buf[16]) {
}
}
// 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;
@ -71,8 +68,8 @@ void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]) {
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)) {
size_t size = fread(data, 1, bytes_left_to_process, file);
if (size == 0 || ferror(file) || feof(file)) {
if (errno == 0) errno = EIO;
return;
}

114
Implementierung/src/md2_impls/md2_3.c Normal file
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@ -0,0 +1,114 @@
#include "../../lib/md2_impls/md2_3.h"
#include "../../lib/md2_impls/md2_common.h"
struct thread_args {
size_t len;
const uint8_t* buf;
};
void process_nothread_hash(size_t len, const uint8_t buf[len],
uint8_t messageDigestBuf[48]) {
for (size_t i = 0; i < (len + 16) / 16 - 1; i++) {
for (int j = 0; j < 16; j++) {
messageDigestBuf[16 + j] = buf[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] ^ MD2_PI_SUBST[t];
}
t = (t + j) % 256;
}
}
}
void* process_hash(void* threadArgs) {
struct thread_args* args = (struct thread_args*)threadArgs;
uint8_t* messageDigestBuf = calloc(48, sizeof(uint8_t));
if (messageDigestBuf == NULL) {
return NULL;
}
process_nothread_hash(args->len, args->buf, messageDigestBuf);
pthread_exit(messageDigestBuf);
}
void* process_checksum(void* threasdArgs) {
struct thread_args* args = (struct thread_args*)threasdArgs;
uint8_t* checksum = calloc(16, sizeof(uint8_t));
if (checksum == NULL) {
return NULL;
}
uint8_t l = 0;
for (size_t i = 0; i < args->len / 16; i++) {
for (int j = 0; j < 16; j++) {
u_int8_t c = args->buf[i * 16 + 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];
}
}
pthread_exit(checksum);
}
void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]) {
int paddingNeeded = 16 - (len % 16);
uint8_t originalPadding = paddingNeeded;
len += paddingNeeded;
uint8_t* newBuf = calloc(len + 16, sizeof(uint8_t));
if (newBuf == NULL) {
return;
}
memcpy(newBuf, buf, len - paddingNeeded);
while (paddingNeeded > 0) {
newBuf[len - paddingNeeded] = originalPadding;
paddingNeeded--;
}
pthread_t thread_1, thread_2;
struct thread_args thread_args = {len, newBuf};
if (pthread_create(&thread_1, NULL, process_hash, (void*)&thread_args) != 0) {
printf("Error creating thread 1\n");
if (errno == 0) errno = EAGAIN;
return;
}
if (pthread_create(&thread_2, NULL, process_checksum, (void*)&thread_args) !=
0) {
printf("Error creating thread 2\n");
if (errno == 0) errno = EAGAIN;
return;
}
u_int8_t* messageDigestBuf;
u_int8_t* checksum;
if (pthread_join(thread_1, (void**)&messageDigestBuf) != 0) {
printf("Error joining thread 1\n");
if (errno == 0) errno = EINVAL;
return;
}
if (pthread_join(thread_2, (void**)&checksum) != 0) {
printf("Error joining thread 2\n");
if (errno == 0) errno = EINVAL;
return;
}
process_nothread_hash(16, checksum, messageDigestBuf);
memcpy(out, messageDigestBuf, 16);
free(messageDigestBuf);
free(checksum);
}