Chore: remove debug flags

Reviewed-on: https://gitlab-gepasp.in.tum.de/gra22s/team199/pulls/9
Reviewed-by: Thomas Florian <thomas.florian@tum.de>

.vscode/settings.json

@@ -13,7 +13,8 @@
     "array": "c",
     "md2.h": "c",
     "io.h": "c",
-    "md2_0.h": "c"
+    "md2_0.h": "c",
+    "md2_common.h": "c"
   },
   "editor.formatOnSave": true,
   "C_Cpp.default.includePath": [

.vscode/tasks.json

@@ -9,8 +9,11 @@
                 "-g",
                 "${fileDirname}/*.c",
                 "${fileDirname}/md2_impls/*.c",
+                "${fileDirname}/md2_impls/md2_reference/*.c",
                 "-o",
-                "${fileDirname}/../md2"
+                "${fileDirname}/../md2",
+                "-D",
+                "MD2_DETAILED_BENCHMARK"
             ],
             "options": {
                 "cwd": "${fileDirname}"

Implementierung/Makefile

@@ -1,12 +1,20 @@
 
 
-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
+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 src/md2_impls/md2_reference/md2_reference.c
 OBJ = ${subst src,build,${SRC:.c=.o}}
 CC = gcc
-CFLAGS = -Ilib -ggdb -std=c11 -g -Wall -Wextra -no-pie -O3 
+DETAILED_BENCHMARK ?= 0
+CFLAGS = -Ilib -std=c11 -Wall -Wextra -O3
+ifeq ($(DETAILED_BENCHMARK), true)
+	CFLAGS += -DMD2_DETAILED_BENCHMARK
+endif
 LDFLAGS = -pthread
-TESTFILES = t/10000 t/1 t/10 t/100 t/1000 #t/2000 t/5000 t/10000
+TESTFILES = t/1 t/2 t/5 t/10 t/20 t/50 t/100 t/1000 t/2000 t/5000 t/10000
 TESTFILES_SIZES = ${subst t/,,${TESTFILES}}
+BLUE=\033[1;36m
+RED=\033[1;31m
+GREEN=\033[1;32m
+NC=\033[0m
 
 all: md2
 
@@ -18,45 +26,77 @@ help:
 	@echo
 	@echo Available targets:
 	@echo - all: build everything
+	@echo "       When DETAILED_BENCHMARK=true is passed, the detailed benchmarks are enabled."
+	@echo "       This will decrease the overall performance of the program."
 	@echo - clean: clean distfiles
 	@echo - help: show this help
-	@echo - benchmarks: run benchmarks (only works on linux!)
+	@echo - benchmarks: run benchmarks
+	@echo - valgrind-check: run checks with valgrind
 
 build/%.o: src/%.c
-	@mkdir -p build/md2_impls
+	@mkdir -p build/md2_impls/md2_reference
 	${CC} -c ${CFLAGS} -o $@ $<
 
 md2: ${OBJ} 
 	${CC} -o $@ $(OBJ) ${LDFLAGS}
 
 t/%:
+	@mkdir -p t
 	@echo
-	@echo "=== Generating ${subst t/,,$@}MB of random data... ==="
+	@echo -e "${BLUE}=== Generating ${subst t/,,$@}MB of random data... ===${NC}"
 	dd if=/dev/random of=$@ bs=1M count=${subst t/,,$@} status=progress
-	@echo "===                done                     ==="
+	@echo -e "${BLUE}===                done                     ===${NC}"
 	@echo
 
 benchmarks.csv: md2 ${TESTFILES}
 	@rm -f $@
-	@for i in 0 1 2 3; do \
+	@echo -n "Implementierung" > $@
+	@for t in $(TESTFILES_SIZES); do \
+		echo -n ";$$t" >> $@; \
+	done
+	@echo "" >> $@
+
+	@for i in 0 1 2 3 4; do \
 		echo ;\
-		echo "=== Testing implementation $$i ===";\
+		echo -e "${BLUE}=== Testing implementation $$i ===${NC}";\
+		echo -n "Implementierung-$$i" >> $@; \
 		for t in $(TESTFILES_SIZES); do \
 			echo -n "- with $${t}MB ... "; \
 			if ! rr=$$(./md2 t/$${t} -B1 -V$${i}); then \
 				echo; \
-				echo "SKIPPED!"; \
-				echo "$${i};$${t};0" >> $@; \
+				echo -e "${RED}ERROR -> SKIPPED!${NC}"; \
+				echo -n ";0" >> $@; \
 			else \
 				r=$$(echo $$rr | xargs | sed -e 's/.*took \(.*\) seconds.*/\1/'); \
 				echo "$${r}s"; \
-				echo "$${i};$${t};$${r}" >> $@; \
+				echo -n ";$${r}" >> $@; \
 			fi; \
 		done; \
-		echo "===           done           ===";\
+		echo "" >> $@; \
+		echo -e "${BLUE}===           done           ===${NC}";\
 		echo;\
     done
-	
+
 benchmarks: benchmarks.csv
 
-.PHONY: all clean help benchmarks
+valgrind-check: md2 t/3
+
+	@for i in 0 1 2 3 4; do \
+		echo; \
+		echo -e "${BLUE}=== Testing implementation $$i ===${NC}";\
+		if ! valgrind --error-exitcode=1 --leak-check=full --tool=memcheck -s ./md2 t/3 -V$$i -B1; then \
+			echo -e "${RED}ERROR found! (see above)${NC}"; \
+			exit 1; \
+		fi; \
+		echo -e "${BLUE}===           done           ===${NC}";\
+		echo; \
+	done
+
+	@if ! valgrind -s ./md2 -T; then \
+		echo -e "${RED}ERROR found! (see above)${NC}"; \
+		exit 1;\
+	fi
+
+	@echo -e "${GREEN}=== all implementations PASSED valgrind ===${NC}"
+
+.PHONY: all clean help benchmarks lint

Implementierung/benchmarks.csv

@@ -0,0 +1,6 @@
+Implementierung;1;2;5;10;20;50;100
+Implementierung-0;0.092604;0.172133;0.422083;0.845732;1.687540;4.232703;8.501036
+Implementierung-1;0.084314;0.167799;0.431772;0.843568;1.708024;5.208127;10.147011
+Implementierung-2;0.097700;0.203661;0.567091;1.062895;2.141933;5.440520;10.342529
+Implementierung-3;0.099547;0.206932;0.546978;1.017148;2.077730;5.067994;9.962873
+Implementierung-4;0.117680;0.239349;0.616783;1.200482;2.356915;5.856234;11.647842

Implementierung/lib/helper.h

@@ -36,6 +36,8 @@ struct configuration {
 enum argumentParseResult parseArguments(int argc, char** argv,
                                         struct configuration* c);
 
+double current_time();
+
 /**
  * @brief Run an md2_hash_func with benchmark timing
  *

Implementierung/lib/md2_impls/md2_1.h

@@ -8,15 +8,6 @@
 #include <string.h>
 #include <sys/types.h>
 
-#include "../io.h"
-
-/**
- * @brief This implementation optimizes small operations and uses SIMD
- *
- * @param _ unused
- * @param filename name of the file to load
- * @param out
- */
 void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16]);
 void md2_checksum_1(size_t len, uint8_t* buf);
 

Implementierung/lib/md2_impls/md2_3.h

@@ -10,13 +10,6 @@
 #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

Implementierung/lib/md2_impls/md2_common.h

@@ -9,6 +9,42 @@
 #include <string.h>
 #include <sys/types.h>
 
+#include "../helper.h"
+
+#ifdef MD2_DETAILED_BENCHMARK
+#define md2_process_detailed_benchmark_step_if_defined(step) \
+  md2_process_detailed_benchmark_step(step);
+
+#define md2_print_detailed_benchmark_result_if_defined \
+  md2_print_detailed_benchmark_result();
+#else
+#define md2_process_detailed_benchmark_step_if_defined(step)
+#define md2_print_detailed_benchmark_result_if_defined
+#endif  // MD2_DETAILED_BENCHMARK
+
+#define CHECKSUM_START_MARK \
+  md2_process_detailed_benchmark_step_if_defined(CHECKSUM_START)
+#define CHECKSUM_END_MARK \
+  md2_process_detailed_benchmark_step_if_defined(CHECKSUM_END)
+#define FIRST_LOOP_START_MARK \
+  md2_process_detailed_benchmark_step_if_defined(FIRST_LOOP_START)
+#define FIRST_LOOP_END_MARK \
+  md2_process_detailed_benchmark_step_if_defined(FIRST_LOOP_END)
+#define SECOND_LOOP_START_MARK \
+  md2_process_detailed_benchmark_step_if_defined(SECOND_LOOP_START)
+#define SECOND_LOOP_END_MARK \
+  md2_process_detailed_benchmark_step_if_defined(SECOND_LOOP_END)
+#define END_MARK md2_print_detailed_benchmark_result_if_defined
+
+enum md2_detailed_benchmark_step {
+  CHECKSUM_START = 0,
+  CHECKSUM_END,
+  FIRST_LOOP_START,
+  FIRST_LOOP_END,
+  SECOND_LOOP_START,
+  SECOND_LOOP_END
+};
+
 /**
  * @brief Some digits of pi
  *
@@ -23,4 +59,8 @@ extern unsigned char MD2_PI_SUBST[256];
  */
 void md2_print_buf(size_t len, uint8_t buf[len]);
 
+void md2_process_detailed_benchmark_step(enum md2_detailed_benchmark_step step);
+
+void md2_print_detailed_benchmark_result();
+
 #endif  // MD2_COMMON_H

Implementierung/lib/md2_impls/md2_reference/md2_reference.h

@@ -0,0 +1,54 @@
+#ifndef MD2_REF_H
+#define MD2_REF_H
+
+/***********************************************************
+ * WICHTIG:
+ * Diese Implementierung wurde nicht von uns geschrieben,
+ * sondern zu vergleichszwechen von der Referenz übernommen.
+ * Quelle: https://datatracker.ietf.org/doc/html/rfc1319
+ **********************************************************/
+
+#ifndef PROTOTYPES
+#define PROTOTYPES 0
+#endif
+
+/* POINTER defines a generic pointer type */
+typedef unsigned char *POINTER;
+
+/* UINT2 defines a two byte word */
+typedef unsigned short int UINT2;
+
+/* UINT4 defines a four byte word */
+typedef unsigned long int UINT4;
+
+/* PROTO_LIST is defined depending on how PROTOTYPES is defined above.
+   If using PROTOTYPES, then PROTO_LIST returns the list, otherwise it
+     returns an empty list.
+ */
+#if PROTOTYPES
+#define PROTO_LIST(list) list
+#else
+#define PROTO_LIST(list) ()
+#endif
+
+typedef struct {
+  unsigned char state[16];    /* state */
+  unsigned char checksum[16]; /* checksum */
+  unsigned int count;         /* number of bytes, modulo 16 */
+  unsigned char buffer[16];   /* input buffer */
+} MD2_CTX;
+
+void MD2Init PROTO_LIST((MD2_CTX *));
+void MD2Update PROTO_LIST((MD2_CTX *, unsigned char *, unsigned int));
+void MD2Final PROTO_LIST((unsigned char[16], MD2_CTX *));
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+
+void md2_hash_ref(size_t len, const uint8_t buf[len], uint8_t out[16]);
+
+#endif  // MD2_REF_H

Implementierung/src/helper.c

@@ -23,7 +23,20 @@ void help(char *progname) {
   -V, --version <version>      use a specific implementation\n\
   -B, --benchmark [repetitons] benchmark the execution and optionally repeat it\n\
   -T, --test                   run self-test. If set, no file is needed\n\
-  -h, --help                   print this help page\n",
+  -h, --help                   print this help page\n\
+  \n\
+  <version> is an integer between 0 and 4.\n\
+  0: naive implementation\n\
+  1: optimized implementation\n\
+  2: memory efficient implementation\n\
+  3: threaded implementation\n\
+  4: reference implementation\n"
+#ifdef MD2_DETAILED_BENCHMARK
+          "\n\
+  \n\033[1;33mWARNING: Detailed benchmarking is enabled. This will show detailed benchmaring results\n\
+         after each hash calculation but will decrease the overall performance.\033[0m"
+#endif  // MD2_DETAILED_BENCHMARK
+          "\n",
           progname);
 }
 
@@ -95,7 +108,7 @@ enum argumentParseResult parseArguments(int argc, char **argv,
   return RESULT_OK;
 }
 
-double current_time(void) {
+double current_time() {
   struct timespec t;
   clock_gettime(CLOCK_MONOTONIC, &t);
   return t.tv_sec + t.tv_nsec * 1e-9;

Implementierung/src/io.c

@@ -35,7 +35,8 @@ uint8_t* read_file(const char* path, size_t* size) {
 
   struct sysinfo info;
   int r = sysinfo(&info);
-  if (r != 0 || info.freeram < (unsigned long)statOfFile.st_size * 2) {
+
+  if (r != 0 || info.freeram < (unsigned long)(statOfFile.st_size * 2)) {
     errno = ENOMEM;
     return NULL;
   }
@@ -46,10 +47,9 @@ uint8_t* read_file(const char* path, size_t* size) {
     return NULL;
   }
 
-  size_t bytesRead =
-      fread(data, statOfFile.st_blksize, statOfFile.st_blocks, f);
-  // size_t bytesRead = fread(data, sizeof(uint8_t), statOfFile.st_size, f);
-  if (bytesRead != 0 && !feof(f)) {
+  size_t bytes_read = fread(data, 1, statOfFile.st_size, f);
+
+  if (bytes_read == 0 || ferror(f)) {
     fclose(f);
     if (errno == 0) errno = EIO;
     return NULL;

Implementierung/src/md2.c

@@ -5,6 +5,7 @@
 #include "../lib/md2_impls/md2_1.h"
 #include "../lib/md2_impls/md2_2.h"
 #include "../lib/md2_impls/md2_3.h"
+#include "../lib/md2_impls/md2_reference/md2_reference.h"
 
 md2_hash_func md2_hash;
 md2_checksum_func md2_checksum;
@@ -40,6 +41,11 @@ bool md2_choose_implementation(int i) {
       md2_checksum = NULL;
       return true;
 
+    case 4:
+      md2_hash = md2_hash_ref;
+      md2_checksum = NULL;
+      return true;
+
     default:
       return false;
   }

Implementierung/src/md2_impls/md2_0.c

@@ -40,7 +40,9 @@ void md2_hash_0(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   // printBuf(len + 16, newBuf);
 
   // === step 2 ===
+  CHECKSUM_START_MARK
   md2_checksum_0(len, newBuf);
+  CHECKSUM_END_MARK
 
   // printf("buf with cecksum: ");
   // printBuf(len + 16, newBuf);
@@ -51,28 +53,32 @@ void md2_hash_0(size_t len, const uint8_t buf[len], uint8_t out[16]) {
     return;
   }
 
-
   // === step 4 ===
   // <= because we need to hash the last block too
   for (size_t i = 0; i <= (len + 16) / 16 - 1; i++) {
+    FIRST_LOOP_START_MARK
     for (int j = 0; j < 16; j++) {
       messageDigestBuf[16 + j] = newBuf[i * 16 + j];
       messageDigestBuf[32 + j] =
           (messageDigestBuf[16 + j] ^ messageDigestBuf[j]);
     }
+    FIRST_LOOP_END_MARK
 
     u_int8_t t = 0;
 
+    SECOND_LOOP_START_MARK
     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;
     }
+    SECOND_LOOP_END_MARK
   }
   // printf("messageDigestBuf: \n");
   // printBuf(16, messageDigestBuf);
 
+  END_MARK
   memcpy(out, messageDigestBuf, 16);
 
   free(messageDigestBuf);

Implementierung/src/md2_impls/md2_1.c

@@ -1,17 +1,14 @@
 #include "../../lib/md2_impls/md2_1.h"
 
-#include "../../lib/md2_impls/md2_common.h"
 #include <immintrin.h>
 
+#include "../../lib/md2_impls/md2_common.h"
 
-void md2_checksum_1(size_t len, uint8_t *buf)
-{
+void md2_checksum_1(size_t len, uint8_t *buf) {
   uint8_t l = 0;
 
-  for (size_t i = 0; i < len / 16; i++)
-  {
-    for (int j = 0; j < 16; j++)
-    {
+  for (size_t 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:
       buf[len + j] ^= MD2_PI_SUBST[c ^ l];
@@ -39,18 +36,17 @@ static uint8_t PADDING[17][16] = {
     {15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 0},
     {16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16}};
 
-void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16])
-{
+void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   // === step 1 ===
   int paddingNeeded = 16 - (len & 15);
   len += paddingNeeded;
 
-  uint8_t* newBuf = aligned_alloc(16, sizeof(uint8_t)*(len + 16));
+  uint8_t *newBuf = aligned_alloc(16, sizeof(uint8_t) * (len + 16));
   if (newBuf == NULL) {
     return;
   }
 
-  for(size_t i = 0; i < 16; i++) {
+  for (size_t i = 0; i < 16; i++) {
     newBuf[len + i] = 0;
   }
 
@@ -59,7 +55,9 @@ void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16])
   memcpy(newBuf + len - paddingNeeded, PADDING + paddingNeeded, paddingNeeded);
 
   // === step 2 ===
+  CHECKSUM_START_MARK
   md2_checksum_1(len, newBuf);
+  CHECKSUM_END_MARK
 
   // === step 3 ===
   uint8_t *messageDigestBuf = aligned_alloc(16, sizeof(uint8_t) * 48);
@@ -74,27 +72,28 @@ void md2_hash_1(size_t len, const uint8_t buf[len], uint8_t out[16])
   // === step 4 ===
   __m128i vx;
   __m128i vy;
-  for (size_t i = 0; i <= (len + 16) / 16 - 1; i++)
-  {
-    vx = _mm_load_si128((__m128i*) (newBuf + i * 16));
-    _mm_store_si128((__m128i*) (messageDigestBuf + 16), vx);
-    vy = _mm_load_si128((__m128i*) (messageDigestBuf));
+  for (size_t i = 0; i <= (len + 16) / 16 - 1; i++) {
+    FIRST_LOOP_START_MARK
+    vx = _mm_load_si128((__m128i *)(newBuf + i * 16));
+    _mm_store_si128((__m128i *)(messageDigestBuf + 16), vx);
+    vy = _mm_load_si128((__m128i *)(messageDigestBuf));
     vy = _mm_xor_si128(vy, vx);
-    _mm_store_si128((__m128i*) (messageDigestBuf + 32), vy);
-  
+    _mm_store_si128((__m128i *)(messageDigestBuf + 32), vy);
+    FIRST_LOOP_END_MARK
 
     u_int8_t t = 0;
 
-    for (int j = 0; j < 18; j++)
-    {
-      for (int k = 0; k < 48; k++)
-      {
+    SECOND_LOOP_START_MARK
+    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) & 255;
     }
+    SECOND_LOOP_END_MARK
   }
 
+  END_MARK
   memcpy(out, messageDigestBuf, 16);
 
   free(messageDigestBuf);

Implementierung/src/md2_impls/md2_2.c

@@ -3,19 +3,23 @@
 #include "../../lib/md2_impls/md2_common.h"
 
 void process_block_hash(uint8_t block[16], uint8_t messageDigestBuf[48]) {
+  FIRST_LOOP_START_MARK
   for (int j = 0; j < 16; j++) {
     messageDigestBuf[16 + j] = block[j];
     messageDigestBuf[32 + j] = (messageDigestBuf[16 + j] ^ messageDigestBuf[j]);
   }
+  FIRST_LOOP_END_MARK
 
   u_int8_t t = 0;
 
+  SECOND_LOOP_START_MARK
   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;
   }
+  SECOND_LOOP_END_MARK
 }
 
 void process_block_checksum(uint8_t block[16], uint8_t checksum[16],
@@ -74,21 +78,24 @@ void md2_hash_2(size_t len, const uint8_t buf[len], uint8_t out[16]) {
       return;
     }
 
+    CHECKSUM_START_MARK
     process_block_checksum(data, checksum, &l);
+    CHECKSUM_END_MARK
     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);
+
+  END_MARK
   memcpy(out, messageDigestBuf, 16);
 
+  fclose(file);
   free(data);
   free(messageDigestBuf);
   free(checksum);

Implementierung/src/md2_impls/md2_3.c

@@ -10,20 +10,24 @@ struct thread_args {
 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++) {
+    FIRST_LOOP_START_MARK
     for (int j = 0; j < 16; j++) {
       messageDigestBuf[16 + j] = buf[i * 16 + j];
       messageDigestBuf[32 + j] =
           (messageDigestBuf[16 + j] ^ messageDigestBuf[j]);
     }
+    FIRST_LOOP_END_MARK
 
     u_int8_t t = 0;
 
+    SECOND_LOOP_START_MARK
     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;
     }
+    SECOND_LOOP_END_MARK
   }
 }
 
@@ -48,7 +52,7 @@ void* process_checksum(void* threasdArgs) {
   }
 
   uint8_t l = 0;
-
+  CHECKSUM_START_MARK
   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];
@@ -56,6 +60,7 @@ void* process_checksum(void* threasdArgs) {
       l = checksum[j] ^= MD2_PI_SUBST[c ^ l];
     }
   }
+  CHECKSUM_END_MARK
   pthread_exit(checksum);
 }
 
@@ -107,8 +112,11 @@ void md2_hash_3(size_t len, const uint8_t buf[len], uint8_t out[16]) {
   }
 
   process_nothread_hash(16, checksum, messageDigestBuf);
+
+  END_MARK
   memcpy(out, messageDigestBuf, 16);
 
   free(messageDigestBuf);
   free(checksum);
+  free(newBuf);
 }

Implementierung/src/md2_impls/md2_common.c

@@ -26,4 +26,35 @@ void md2_print_buf(size_t len, uint8_t buf[len]) {
     printf("'%02x',", buf[i]);
   }
   printf("\n");
+}
+
+static double detailed_benchmark_timestamps[6] = {0, 0, 0, 0, 0, 0};
+static double detailed_benchmark_times[3] = {0, 0, 0};
+
+void md2_process_detailed_benchmark_step(
+    enum md2_detailed_benchmark_step step) {
+  switch (step) {
+    case CHECKSUM_START:
+    case FIRST_LOOP_START:
+    case SECOND_LOOP_START:
+      detailed_benchmark_timestamps[step] = current_time();
+      return;
+
+    case CHECKSUM_END:
+    case FIRST_LOOP_END:
+    case SECOND_LOOP_END:
+      detailed_benchmark_timestamps[step] = current_time();
+      detailed_benchmark_times[step / 2] +=
+          detailed_benchmark_timestamps[step] -
+          detailed_benchmark_timestamps[step - 1];
+      return;
+  }
+}
+
+void md2_print_detailed_benchmark_result() {
+  printf("Detailed benchmarking results:\n");
+  printf("  Checksum: %f\n", detailed_benchmark_times[0]);
+  printf("  First loop: %f\n", detailed_benchmark_times[1]);
+  printf("  Second loop: %f\n", detailed_benchmark_times[2]);
+  printf("\n");
 }

Implementierung/src/md2_impls/md2_reference/md2_reference.c

@@ -0,0 +1,215 @@
+/* MD2C.C - RSA Data Security, Inc., MD2 message-digest algorithm
+ */
+
+/***********************************************************
+ * WICHTIG:
+ * Diese Implementierung wurde nicht von uns geschrieben,
+ * sondern zu vergleichszwechen von der Referenz übernommen.
+ * Quelle: https://datatracker.ietf.org/doc/html/rfc1319
+ **********************************************************/
+
+/* Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All
+   rights reserved.
+
+   License to copy and use this software is granted for
+   non-commercial Internet Privacy-Enhanced Mail provided that it is
+   identified as the "RSA Data Security, Inc. MD2 Message Digest
+   Algorithm" in all material mentioning or referencing this software
+   or this function.
+
+   RSA Data Security, Inc. makes no representations concerning either
+   the merchantability of this software or the suitability of this
+   software for any particular purpose. It is provided "as is"
+   without express or implied warranty of any kind.
+
+   These notices must be retained in any copies of any part of this
+   documentation and/or software.
+ */
+
+#include "../../../lib/md2_impls/md2_reference/md2_reference.h"
+
+static void MD2Transform PROTO_LIST((unsigned char[16], unsigned char[16],
+                                     unsigned char[16]));
+static void MD2_memcpy PROTO_LIST((POINTER, POINTER, unsigned int));
+static void MD2_memset PROTO_LIST((POINTER, int, unsigned int));
+
+/* Permutation of 0..255 constructed from the digits of pi. It gives a
+   "random" nonlinear byte substitution operation.
+ */
+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};
+
+static unsigned char *PADDING[] = {
+    (unsigned char *)"",
+    (unsigned char *)"\001",
+    (unsigned char *)"\002\002",
+    (unsigned char *)"\003\003\003",
+    (unsigned char *)"\004\004\004\004",
+    (unsigned char *)"\005\005\005\005\005",
+    (unsigned char *)"\006\006\006\006\006\006",
+    (unsigned char *)"\007\007\007\007\007\007\007",
+    (unsigned char *)"\010\010\010\010\010\010\010\010",
+    (unsigned char *)"\011\011\011\011\011\011\011\011\011",
+    (unsigned char *)"\012\012\012\012\012\012\012\012\012\012",
+    (unsigned char *)"\013\013\013\013\013\013\013\013\013\013\013",
+    (unsigned char *)"\014\014\014\014\014\014\014\014\014\014\014\014",
+    (unsigned char *)"\015\015\015\015\015\015\015\015\015\015\015\015\015",
+    (unsigned char *)"\016\016\016\016\016\016\016\016\016\016\016\016\016\016",
+    (unsigned char
+         *)"\017\017\017\017\017\017\017\017\017\017\017\017\017\017\017",
+    (unsigned char
+         *)"\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020"};
+
+void md2_hash_ref(size_t len, const uint8_t buf[len], uint8_t out[16]) {
+  MD2_CTX context;
+
+  MD2Init(&context);
+  MD2Update(&context, buf, len);
+  MD2Final(out, &context);
+}
+
+/* MD2 initialization. Begins an MD2 operation, writing a new context.
+ */
+void MD2Init(context) MD2_CTX *context; /* context */
+{
+  context->count = 0;
+  MD2_memset((POINTER)context->state, 0, sizeof(context->state));
+  MD2_memset((POINTER)context->checksum, 0, sizeof(context->checksum));
+}
+
+/* MD2 block update operation. Continues an MD2 message-digest
+     operation, processing another message block, and updating the
+     context.
+ */
+void MD2Update(context, input, inputLen) MD2_CTX *context; /* context */
+unsigned char *input;                                      /* input block */
+unsigned int inputLen; /* length of input block */
+{
+  unsigned int i, index, partLen;
+
+  /* Update number of bytes mod 16 */
+  index = context->count;
+  context->count = (index + inputLen) & 0xf;
+
+  partLen = 16 - index;
+
+  /* Transform as many times as possible.
+   */
+  if (inputLen >= partLen) {
+    MD2_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
+    MD2Transform(context->state, context->checksum, context->buffer);
+
+    for (i = partLen; i + 15 < inputLen; i += 16)
+      MD2Transform(context->state, context->checksum, &input[i]);
+
+    index = 0;
+  } else
+    i = 0;
+
+  /* Buffer remaining input */
+  MD2_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],
+             inputLen - i);
+}
+
+/* MD2 finalization. Ends an MD2 message-digest operation, writing the
+     message digest and zeroizing the context.
+ */
+void MD2Final(digest, context)
+
+    unsigned char digest[16]; /* message digest */
+MD2_CTX *context;             /* context */
+{
+  unsigned int index, padLen;
+
+  /* Pad out to multiple of 16.
+   */
+  index = context->count;
+  padLen = 16 - index;
+  MD2Update(context, PADDING[padLen], padLen);
+
+  /* Extend with checksum */
+  MD2Update(context, context->checksum, 16);
+
+  /* Store state in digest */
+  MD2_memcpy((POINTER)digest, (POINTER)context->state, 16);
+
+  /* Zeroize sensitive information.
+   */
+  MD2_memset((POINTER)context, 0, sizeof(*context));
+}
+
+/* MD2 basic transformation. Transforms state and updates checksum
+     based on block.
+ */
+static void MD2Transform(state, checksum, block) unsigned char state[16];
+unsigned char checksum[16];
+unsigned char block[16];
+{
+  unsigned int i, j, t;
+  unsigned char x[48];
+
+  /* Form encryption block from state, block, state ^ block.
+   */
+  MD2_memcpy((POINTER)x, (POINTER)state, 16);
+  MD2_memcpy((POINTER)x + 16, (POINTER)block, 16);
+  for (i = 0; i < 16; i++) x[i + 32] = state[i] ^ block[i];
+
+  /* Encrypt block (18 rounds).
+   */
+  t = 0;
+  for (i = 0; i < 18; i++) {
+    for (j = 0; j < 48; j++) t = x[j] ^= PI_SUBST[t];
+    t = (t + i) & 0xff;
+  }
+
+  /* Save new state */
+  MD2_memcpy((POINTER)state, (POINTER)x, 16);
+
+  /* Update checksum.
+   */
+  t = checksum[15];
+  for (i = 0; i < 16; i++) t = checksum[i] ^= PI_SUBST[block[i] ^ t];
+
+  /* Zeroize sensitive information.
+   */
+  MD2_memset((POINTER)x, 0, sizeof(x));
+}
+
+/* Note: Replace "for loop" with standard memcpy if possible.
+ */
+static void MD2_memcpy(output, input, len) POINTER output;
+POINTER input;
+unsigned int len;
+{
+  unsigned int i;
+
+  for (i = 0; i < len; i++) output[i] = input[i];
+}
+
+/* Note: Replace "for loop" with standard memset if possible.
+ */
+static void MD2_memset(output, value, len) POINTER output;
+int value;
+unsigned int len;
+{
+  unsigned int i;
+
+  for (i = 0; i < len; i++) ((char *)output)[i] = (char)value;
+}