Feat: add reference implementation as 4

.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": [

Implementierung/Makefile

@@ -1,11 +1,11 @@
 
 
-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 
 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}}
 
 all: md2
@@ -23,7 +23,7 @@ help:
 	@echo - benchmarks: run benchmarks (only works on linux!)
 
 build/%.o: src/%.c
-	@mkdir -p build/md2_impls
+	@mkdir -p build/md2_impls/md2_reference
 	${CC} -c ${CFLAGS} -o $@ $<
 
 md2: ${OBJ} 
@@ -38,21 +38,29 @@ t/%:
 
 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 -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};$${t};0" >> $@; \
+				echo -n ";0" >> $@; \
 			else \
 				r=$$(echo $$rr | xargs | sed -e 's/.*took \(.*\) seconds.*/\1/'); \
 				echo "$${r}s"; \
-				echo "$${i};$${t};$${r}" >> $@; \
+				echo -n ";$${r}" >> $@; \
 			fi; \
 		done; \
+		echo "" >> $@; \
 		echo "===           done           ===";\
 		echo;\
     done

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/md2_impls/md2_reference/md2_reference.h

@@ -0,0 +1,63 @@
+#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>
+
+#include "../../io.h"
+
+/**
+ * @brief This implementation is the reference implementation
+ *
+ * @param _ unused
+ * @param filename name of the file to load
+ * @param out
+ */
+void md2_hash_ref(size_t len, const uint8_t buf[len], uint8_t out[16]);
+
+#endif  // MD2_REF_H

Implementierung/lib/md2_impls/reference_impl/global.h

@@ -1,22 +0,0 @@
-#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

Implementierung/lib/md2_impls/reference_impl/md2_reference.h

@@ -1,36 +0,0 @@
-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 *));
-
-
-#ifndef MD2_REF_H
-#define MD2_REF_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 is the reference implementation
- *
- * @param _ unused
- * @param filename name of the file to load
- * @param out
- */
-void md2_hash_ref(size_t len, const uint8_t buf[len], uint8_t out[16]);
-void md2_checksum_ref(size_t len, uint8_t* buf);
-
-#endif  // MD2_REF_H

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_reference/md2_reference.c

@@ -1,6 +1,13 @@
 /* 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.
 
@@ -19,81 +26,81 @@
    documentation and/or software.
  */
 
-#include "global.h"
+#include "../../../lib/md2_impls/md2_reference/md2_reference.h"
-#include "md2_reference.h"
 
-static void MD2Transform PROTO_LIST
+static void MD2Transform PROTO_LIST((unsigned char[16], unsigned char[16],
-  ((unsigned char [16], unsigned char [16], unsigned char [16]));
+                                     unsigned char[16]));
-static void MD2_memcpy PROTO_LIST ((POINTER, POINTER, unsigned int));
+static void MD2_memcpy PROTO_LIST((POINTER, POINTER, unsigned int));
-static void MD2_memset PROTO_LIST ((POINTER, int, 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,
+    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,
+    19,  98,  167, 5,   243, 192, 199, 115, 140, 152, 147, 43,  217, 188, 76,
-  76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
+    130, 202, 30,  155, 87,  60,  253, 212, 224, 22,  103, 66,  111, 24,  138,
-  138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
+    23,  229, 18,  190, 78,  196, 214, 218, 158, 222, 73,  160, 251, 245, 142,
-  245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
+    187, 47,  238, 122, 169, 104, 121, 145, 21,  178, 7,   63,  148, 194, 16,
-  148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
+    137, 11,  34,  95,  33,  128, 127, 93,  154, 90,  144, 50,  39,  53,  62,
-  39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
+    204, 231, 191, 247, 151, 3,   255, 25,  48,  179, 72,  165, 181, 209, 215,
-  181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
+    94,  146, 42,  172, 86,  170, 198, 79,  184, 56,  210, 150, 164, 125, 182,
-  150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
+    118, 252, 107, 226, 156, 116, 4,   241, 69,  157, 112, 89,  100, 113, 135,
-  112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
+    32,  134, 91,  207, 101, 230, 45,  168, 2,   27,  96,  37,  173, 174, 176,
-  96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
+    185, 246, 28,  70,  97,  105, 52,  64,  126, 15,  85,  71,  163, 35,  221,
-  85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
+    81,  175, 58,  195, 92,  249, 206, 186, 197, 234, 38,  44,  83,  13,  110,
-  234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
+    133, 40,  132, 9,   211, 223, 205, 244, 65,  129, 77,  82,  106, 220, 55,
-  129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
+    200, 108, 193, 171, 250, 36,  225, 123, 8,   12,  189, 177, 74,  120, 136,
-  8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
+    149, 139, 227, 99,  232, 109, 233, 203, 213, 254, 59,  0,   29,  57,  242,
-  203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
+    239, 183, 14,  102, 88,  208, 228, 166, 119, 114, 248, 235, 117, 75,  10,
-  166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
+    49,  68,  80,  180, 143, 237, 31,  26,  219, 153, 141, 51,  159, 17,  131,
-  31, 26, 219, 153, 141, 51, 159, 17, 131, 20
+    20};
-};
 
 static unsigned char *PADDING[] = {
-  (unsigned char *)"",
+    (unsigned char *)"",
-  (unsigned char *)"\001",
+    (unsigned char *)"\001",
-  (unsigned char *)"\002\002",
+    (unsigned char *)"\002\002",
-  (unsigned char *)"\003\003\003",
+    (unsigned char *)"\003\003\003",
-  (unsigned char *)"\004\004\004\004",
+    (unsigned char *)"\004\004\004\004",
-  (unsigned char *)"\005\005\005\005\005",
+    (unsigned char *)"\005\005\005\005\005",
-  (unsigned char *)"\006\006\006\006\006\006",
+    (unsigned char *)"\006\006\006\006\006\006",
-  (unsigned char *)"\007\007\007\007\007\007\007",
+    (unsigned char *)"\007\007\007\007\007\007\007",
-  (unsigned char *)"\010\010\010\010\010\010\010\010",
+    (unsigned char *)"\010\010\010\010\010\010\010\010",
-  (unsigned char *)"\011\011\011\011\011\011\011\011\011",
+    (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 *)"\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 *)"\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 *)"\014\014\014\014\014\014\014\014\014\014\014\014",
-  (unsigned char *)
+    (unsigned char *)"\015\015\015\015\015\015\015\015\015\015\015\015\015",
-    "\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 *)
+    (unsigned char
-    "\016\016\016\016\016\016\016\016\016\016\016\016\016\016",
+         *)"\017\017\017\017\017\017\017\017\017\017\017\017\017\017\017",
-  (unsigned char *)
+    (unsigned char
-    "\017\017\017\017\017\017\017\017\017\017\017\017\017\017\017",
+         *)"\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020"};
-  (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)
+void MD2Init(context) MD2_CTX *context; /* context */
-MD2_CTX *context;                                        /* context */
 {
   context->count = 0;
-  MD2_memset ((POINTER)context->state, 0, sizeof (context->state));
+  MD2_memset((POINTER)context->state, 0, sizeof(context->state));
-  MD2_memset
+  MD2_memset((POINTER)context->checksum, 0, sizeof(context->checksum));
-    ((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)
+void MD2Update(context, input, inputLen) MD2_CTX *context; /* context */
-MD2_CTX *context;                                        /* context */
+unsigned char *input;                                      /* input block */
-unsigned char *input;                                /* input block */
+unsigned int inputLen; /* length of input block */
-unsigned int inputLen;                     /* length of input block */
 {
   unsigned int i, index, partLen;
 
@@ -104,33 +111,30 @@ unsigned int inputLen;                     /* length of input block */
   partLen = 16 - index;
 
   /* Transform as many times as possible.
-    */
+   */
   if (inputLen >= partLen) {
-    MD2_memcpy
+    MD2_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
-      ((POINTER)&context->buffer[index], (POINTER)input, partLen);
+    MD2Transform(context->state, context->checksum, context->buffer);
-    MD2Transform (context->state, context->checksum, context->buffer);
 
     for (i = partLen; i + 15 < inputLen; i += 16)
-      MD2Transform (context->state, context->checksum, &input[i]);
+      MD2Transform(context->state, context->checksum, &input[i]);
 
     index = 0;
-  }
+  } else
-  else
     i = 0;
 
   /* Buffer remaining input */
-  MD2_memcpy
+  MD2_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i],
-    ((POINTER)&context->buffer[index], (POINTER)&input[i],
+             inputLen - i);
-     inputLen-i);
 }
 
 /* MD2 finalization. Ends an MD2 message-digest operation, writing the
      message digest and zeroizing the context.
  */
-void MD2Final (digest, context)
+void MD2Final(digest, context)
 
-unsigned char digest[16];                         /* message digest */
+    unsigned char digest[16]; /* message digest */
-MD2_CTX *context;                                        /* context */
+MD2_CTX *context;             /* context */
 {
   unsigned int index, padLen;
 
@@ -138,24 +142,23 @@ MD2_CTX *context;                                        /* context */
    */
   index = context->count;
   padLen = 16 - index;
-  MD2Update (context, PADDING[padLen], padLen);
+  MD2Update(context, PADDING[padLen], padLen);
 
   /* Extend with checksum */
-  MD2Update (context, context->checksum, 16);
+  MD2Update(context, context->checksum, 16);
 
   /* Store state in digest */
-  MD2_memcpy ((POINTER)digest, (POINTER)context->state, 16);
+  MD2_memcpy((POINTER)digest, (POINTER)context->state, 16);
 
   /* Zeroize sensitive information.
    */
-  MD2_memset ((POINTER)context, 0, sizeof (*context));
+  MD2_memset((POINTER)context, 0, sizeof(*context));
 }
 
 /* MD2 basic transformation. Transforms state and updates checksum
      based on block.
  */
-static void MD2Transform (state, checksum, block)
+static void MD2Transform(state, checksum, block) unsigned char state[16];
-unsigned char state[16];
 unsigned char checksum[16];
 unsigned char block[16];
 {
@@ -164,57 +167,49 @@ unsigned char block[16];
 
   /* Form encryption block from state, block, state ^ block.
    */
-  MD2_memcpy ((POINTER)x, (POINTER)state, 16);
+  MD2_memcpy((POINTER)x, (POINTER)state, 16);
-  MD2_memcpy ((POINTER)x+16, (POINTER)block, 16);
+  MD2_memcpy((POINTER)x + 16, (POINTER)block, 16);
-  for (i = 0; i < 16; i++)
+  for (i = 0; i < 16; i++) x[i + 32] = state[i] ^ block[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++)
+    for (j = 0; j < 48; j++) t = x[j] ^= PI_SUBST[t];
-      t = x[j] ^= PI_SUBST[t];
     t = (t + i) & 0xff;
   }
 
-
+  /* Save new state */
-/* Save new state */
+  MD2_memcpy((POINTER)state, (POINTER)x, 16);
-  MD2_memcpy ((POINTER)state, (POINTER)x, 16);
 
   /* Update checksum.
    */
   t = checksum[15];
-  for (i = 0; i < 16; i++)
+  for (i = 0; i < 16; i++) t = checksum[i] ^= PI_SUBST[block[i] ^ t];
-    t = checksum[i] ^= PI_SUBST[block[i] ^ t];
 
   /* Zeroize sensitive information.
    */
-  MD2_memset ((POINTER)x, 0, sizeof (x));
+  MD2_memset((POINTER)x, 0, sizeof(x));
 }
 
 /* Note: Replace "for loop" with standard memcpy if possible.
  */
-static void MD2_memcpy (output, input, len)
+static void MD2_memcpy(output, input, len) POINTER output;
-POINTER output;
 POINTER input;
 unsigned int len;
 {
   unsigned int i;
 
-  for (i = 0; i < len; i++)
+  for (i = 0; i < len; i++) output[i] = input[i];
-    output[i] = input[i];
 }
 
 /* Note: Replace "for loop" with standard memset if possible.
  */
-static void MD2_memset (output, value, len)
+static void MD2_memset(output, value, len) POINTER output;
-POINTER output;
 int value;
 unsigned int len;
 {
   unsigned int i;
 
-  for (i = 0; i < len; i++)
+  for (i = 0; i < len; i++) ((char *)output)[i] = (char)value;
-    ((char *)output)[i] = (char)value;
 }

Implementierung/src/md2_impls/md2_reference/mddriver.c

@@ -1,209 +0,0 @@
-/* MDDRIVER.C - test driver for MD2, MD4 and MD5
- */
-
-/* Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All
-   rights reserved.
-      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.
- */
-
-/* The following makes MD default to MD5 if it has not already been
-     defined with C compiler flags.
- */
-#ifndef MD
-#define MD MD5
-#endif
-
-#include <stdio.h>
-#include <time.h>
-#include <string.h>
-#include "global.h"
-#if MD == 2
-#include "md2_reference.h"
-#endif
-
-/* Length of test block, number of test blocks.
- */
-#define TEST_BLOCK_LEN 1000
-#define TEST_BLOCK_COUNT 1000
-
-static void MDString PROTO_LIST ((char *));
-static void MDTimeTrial PROTO_LIST ((void));
-static void MDTestSuite PROTO_LIST ((void));
-static void MDFile PROTO_LIST ((char *));
-static void MDFilter PROTO_LIST ((void));
-static void MDPrint PROTO_LIST ((unsigned char [16]));
-
-#if MD == 2
-#define MD_CTX MD2_CTX
-#define MDInit MD2Init
-#define MDUpdate MD2Update
-#define MDFinal MD2Final
-#endif
-
-
-/* Main driver.
-
-   Arguments (may be any combination):
-     -sstring - digests string
-     -t       - runs time trial
-     -x       - runs test script
-     filename - digests file
-     (none)   - digests standard input
- */
-int main (argc, argv)
-int argc;
-char *argv[];
-{
-  int i;
-
-  if (argc > 1)
-    for (i = 1; i < argc; i++)
-      if (argv[i][0] == '-' && argv[i][1] == 's')
-        MDString (argv[i] + 2);
-      else if (strcmp (argv[i], "-t") == 0)
-        MDTimeTrial ();
-      else if (strcmp (argv[i], "-x") == 0)
-        MDTestSuite ();
-      else
-        MDFile (argv[i]);
-  else
-    MDFilter ();
-
-  return (0);
-}
-
-/* Digests a string and prints the result.
- */
-static void MDString (string)
-char *string;
-
-{
-  MD_CTX context;
-  unsigned char digest[16];
-  unsigned int len = strlen (string);
-
-  MDInit (&context);
-  MDUpdate (&context, string, len);
-  MDFinal (digest, &context);
-
-  printf ("MD%d (\"%s\") = ", MD, string);
-  MDPrint (digest);
-  printf ("\n");
-}
-
-/* Measures the time to digest TEST_BLOCK_COUNT TEST_BLOCK_LEN-byte
-     blocks.
- */
-static void MDTimeTrial ()
-{
-  MD_CTX context;
-  time_t endTime, startTime;
-  unsigned char block[TEST_BLOCK_LEN], digest[16];
-  unsigned int i;
-
-  printf
-    ("MD%d time trial. Digesting %d %d-byte blocks ...", MD,
-     TEST_BLOCK_LEN, TEST_BLOCK_COUNT);
-
-  /* Initialize block */
-  for (i = 0; i < TEST_BLOCK_LEN; i++)
-    block[i] = (unsigned char)(i & 0xff);
-
-  /* Start timer */
-  time (&startTime);
-
-  /* Digest blocks */
-  MDInit (&context);
-  for (i = 0; i < TEST_BLOCK_COUNT; i++)
-    MDUpdate (&context, block, TEST_BLOCK_LEN);
-  MDFinal (digest, &context);
-
-  /* Stop timer */
-  time (&endTime);
-
-  printf (" done\n");
-  printf ("Digest = ");
-  MDPrint (digest);
-  printf ("\nTime = %ld seconds\n", (long)(endTime-startTime));
-  printf
-    ("Speed = %ld bytes/second\n",
-     (long)TEST_BLOCK_LEN * (long)TEST_BLOCK_COUNT/(endTime-startTime));
-}
-/* Digests a reference suite of strings and prints the results.
- */
-static void MDTestSuite ()
-{
-  printf ("MD%d test suite:\n", MD);
-
-  MDString ("");
-  MDString ("a");
-  MDString ("abc");
-  MDString ("message digest");
-  MDString ("abcdefghijklmnopqrstuvwxyz");
-  MDString
-    ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789");
-  MDString
-    ("1234567890123456789012345678901234567890\
-1234567890123456789012345678901234567890");
-}
-
-/* Digests a file and prints the result.
- */
-static void MDFile (filename)
-char *filename;
-{
-  FILE *file;
-  MD_CTX context;
-  int len;
-  unsigned char buffer[1024], digest[16];
-
-  if ((file = fopen (filename, "rb")) == NULL)
-    printf ("%s can't be opened\n", filename);
-
-  else {
-    MDInit (&context);
-    while (len = fread (buffer, 1, 1024, file))
-      MDUpdate (&context, buffer, len);
-    MDFinal (digest, &context);
-
-    fclose (file);
-
-    printf ("MD%d (%s) = ", MD, filename);
-    MDPrint (digest);
-    printf ("\n");
-  }
-}
-
-/* Digests the standard input and prints the result.
- */
-static void MDFilter ()
-{
-  MD_CTX context;
-  int len;
-  unsigned char buffer[16], digest[16];
-
-  MDInit (&context);
-  while (len = fread (buffer, 1, 16, stdin))
-    MDUpdate (&context, buffer, len);
-  MDFinal (digest, &context);
-
-  MDPrint (digest);
-  printf ("\n");
-}
-
-/* Prints a message digest in hexadecimal.
- */
-static void MDPrint (digest)
-unsigned char digest[16];
-{
-  unsigned int i;
-
-  for (i = 0; i < 16; i++)
-    printf ("%02x", digest[i]);
-}