Use a common template for all the file checksum programs.

Makefile

@@ -51,17 +51,17 @@ aestest.a: aestest.c aes.h
 aescrypt.a: aescrypt.c aes.h
 	$(CC) $(CFLAGS) -c $<
 
-sha1sum.a: sha1sum.c sha1.h
+sha1sum.a: sha1sum.c sha1.h cksumcommon.h
 	$(CC) $(CFLAGS) -c $<
 sha1test.a: sha1test.c sha1.h
 	$(CC) $(CFLAGS) -c $<
 
-sha256sum.a: sha256sum.c sha256.h
+sha256sum.a: sha256sum.c sha256.h cksumcommon.h
 	$(CC) $(CFLAGS) -c $<
 sha256test.a: sha256test.c sha256.h
 	$(CC) $(CFLAGS) -c $<
 
-md5sum.a: md5sum.c md5.h
+md5sum.a: md5sum.c md5.h cksumcommon.h
 	$(CC) $(CFLAGS) -c $<
 md5test.a: md5test.c md5.h
 	$(CC) $(CFLAGS) -c $<

cksumcommon.h

@@ -0,0 +1,64 @@
+/*
+ * Copyright (c) 2017 Stephen Heumann
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+/*
+ * This file is a template for computing file checksums with the various
+ * different hash functions from lib65816hash.  This should be #included
+ * from another file after HASH_FUNCTION is defined to the name of the
+ * hash function to use and the corresponding header is included.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <time.h>
+
+#define join(a,b) a##b
+#define concat(a,b) join(a,b)
+
+unsigned char buf[0x8000ul];
+
+int main(int argc, char **argv) {
+    struct concat(HASH_FUNCTION,_context) ctx;
+    FILE *file;
+    size_t count;
+    int i;
+
+    srand(time(NULL));
+
+    if (argc != 2)
+        return EXIT_FAILURE;
+
+    file = fopen(argv[1], "rb");
+    if (file == NULL)
+        return EXIT_FAILURE;
+    
+    concat(HASH_FUNCTION,_init)(&ctx);
+    do {
+        count = (rand() & 0x7FFF) + 1;
+        count = fread(buf, 1, count, file);
+        concat(HASH_FUNCTION,_update)(&ctx, buf, count);
+    } while (count != 0);
+    
+    fclose(file);
+    concat(HASH_FUNCTION,_finalize)(&ctx);
+    
+    for (i = 0; i < sizeof(ctx.hash); i++) {
+        printf("%02x", ctx.hash[i]);
+    }
+    printf("\n");
+    
+    return 0;
+}

md5sum.c

@@ -14,42 +14,7 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include <stdlib.h>
-#include <stdio.h>
-#include <time.h>
 #include "md5.h"
+#define HASH_FUNCTION md5
+#include "cksumcommon.h"
 
-unsigned char buf[0x8000ul];
-
-int main(int argc, char **argv) {
-    struct md5_context ctx;
-    FILE *file;
-    size_t count;
-    int i;
-
-    srand(time(NULL));
-
-    if (argc != 2)
-        return EXIT_FAILURE;
-
-    file = fopen(argv[1], "rb");
-    if (file == NULL)
-        return EXIT_FAILURE;
-    
-    md5_init(&ctx);
-    do {
-        count = (rand() & 0x7FFF) + 1;
-        count = fread(buf, 1, count, file);
-        md5_update(&ctx, buf, count);
-    } while (count != 0);
-    
-    fclose(file);
-    md5_finalize(&ctx);
-    
-    for (i = 0; i < 16; i++) {
-        printf("%02x", ctx.hash[i]);
-    }
-    printf("\n");
-    
-    return 0;
-}

sha1sum.c

@@ -14,42 +14,7 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include <stdlib.h>
-#include <stdio.h>
-#include <time.h>
 #include "sha1.h"
+#define HASH_FUNCTION sha1
+#include "cksumcommon.h"
 
-unsigned char buf[0x8000ul];
-
-int main(int argc, char **argv) {
-    struct sha1_context ctx;
-    FILE *file;
-    size_t count;
-    int i;
-
-    srand(time(NULL));
-
-    if (argc != 2)
-        return EXIT_FAILURE;
-
-    file = fopen(argv[1], "rb");
-    if (file == NULL)
-        return EXIT_FAILURE;
-    
-    sha1_init(&ctx);
-    do {
-        count = (rand() & 0x7FFF) + 1;
-        count = fread(buf, 1, count, file);
-        sha1_update(&ctx, buf, count);
-    } while (count != 0);
-    
-    fclose(file);
-    sha1_finalize(&ctx);
-    
-    for (i = 0; i < 20; i++) {
-        printf("%02x", ctx.hash[i]);
-    }
-    printf("\n");
-    
-    return 0;
-}

sha256sum.c

@@ -14,42 +14,7 @@
  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  */
 
-#include <stdlib.h>
-#include <stdio.h>
-#include <time.h>
 #include "sha256.h"
+#define HASH_FUNCTION sha256
+#include "cksumcommon.h"
 
-unsigned char buf[0x8000ul];
-
-int main(int argc, char **argv) {
-    struct sha256_context ctx;
-    FILE *file;
-    size_t count;
-    int i;
-
-    srand(time(NULL));
-
-    if (argc != 2)
-        return EXIT_FAILURE;
-
-    file = fopen(argv[1], "rb");
-    if (file == NULL)
-        return EXIT_FAILURE;
-    
-    sha256_init(&ctx);
-    do {
-        count = (rand() & 0x7FFF) + 1;
-        count = fread(buf, 1, count, file);
-        sha256_update(&ctx, buf, count);
-    } while (count != 0);
-    
-    fclose(file);
-    sha256_finalize(&ctx);
-    
-    for (i = 0; i < 32; i++) {
-        printf("%02x", ctx.hash[i]);
-    }
-    printf("\n");
-    
-    return 0;
-}